paper.js

/*!
 * Paper.js v0.21
 *
 * This file is part of Paper.js, a JavaScript Vector Graphics Library,
 * based on Scriptographer.org and designed to be largely API compatible.
 * http:
 * http:
 *
 * Copyright (c) 2011, Juerg Lehni & Jonathan Puckey
 * http:
 *
 * Distributed under the MIT license. See LICENSE file for details.
 *
 * All rights reserved.
 *
 * Date: Sat Sep 3 06:15:57 2011 -0700
 *
 ***
 *
 * Bootstrap.js JavaScript Framework.
 * http:
 *
 * Copyright (c) 2006 - 2011 Juerg Lehni
 * http:
 *
 * Distributed under the MIT license.
 *
 ***
 *
 * Parse-js
 *
 * A JavaScript tokenizer / parser / generator, originally written in Lisp.
 * Copyright (c) Marijn Haverbeke <marijnh@gmail.com>
 * http:
 *
 * Ported by to JavaScript by Mihai Bazon
 * Copyright (c) 2010, Mihai Bazon <mihai.bazon@gmail.com>
 * http:
 *
 * Modifications and adaptions to browser (c) 2011, Juerg Lehni
 * http:
 *
 * Distributed under the BSD license.
 */

var paper = new function() {

var Base = new function() { 
	var fix = !this.__proto__,
		hidden = /^(statics|generics|preserve|enumerable|prototype|__proto__|toString|valueOf)$/,
		proto = Object.prototype,
		has = fix
			? function(name) {
				return name !== '__proto__' && this.hasOwnProperty(name);
			}
			: proto.hasOwnProperty,
		toString = proto.toString,
		proto = Array.prototype,
		isArray = Array.isArray = Array.isArray || function(obj) {
			return toString.call(obj) === '[object Array]';
		},
		slice = proto.slice,
		forEach = proto.forEach = proto.forEach || function(iter, bind) {
			for (var i = 0, l = this.length; i < l; i++)
				iter.call(bind, this[i], i, this);
		},
		forIn = function(iter, bind) {
			for (var i in this)
				if (this.hasOwnProperty(i))
					iter.call(bind, this[i], i, this);
		},
		_define = Object.defineProperty,
		_describe = Object.getOwnPropertyDescriptor;

	function define(obj, name, desc) {
		if (_define) {
			try {
				delete obj[name];
				return _define(obj, name, desc);
			} catch (e) {}
		}
		if ((desc.get || desc.set) && obj.__defineGetter__) {
			desc.get && obj.__defineGetter__(name, desc.get);
			desc.set && obj.__defineSetter__(name, desc.set);
		} else {
			obj[name] = desc.value;
		}
		return obj;
	}

	function describe(obj, name) {
		if (_describe) {
			try {
				return _describe(obj, name);
			} catch (e) {}
		}
		var get = obj.__lookupGetter__ && obj.__lookupGetter__(name);
		return get
			? { get: get, set: obj.__lookupSetter__(name), enumerable: true,
					configurable: true }
			: has.call(obj, name)
				? { value: obj[name], enumerable: true, configurable: true,
						writable: true }
				: null;
	}

	function inject(dest, src, enumerable, base, preserve, generics) {
		var beans, bean;

		function field(name, val, dontCheck, generics) {
			var val = val || (val = describe(src, name))
					&& (val.get ? val : val.value),
				func = typeof val === 'function',
				res = val,
				prev = preserve || func
					? (val && val.get ? name in dest : dest[name]) : null;
			if (generics && func && (!preserve || !generics[name])) {
				generics[name] = function(bind) {
					return bind && dest[name].apply(bind,
							slice.call(arguments, 1));
				}
			}
			if ((dontCheck || val !== undefined && has.call(src, name))
					&& (!preserve || !prev)) {
				if (func) {
					if (prev && /\bthis\.base\b/.test(val)) {
						var fromBase = base && base[name] == prev;
						res = function() {
							var tmp = describe(this, 'base');
							define(this, 'base', { value: fromBase
								? base[name] : prev, configurable: true });
							try {
								return val.apply(this, arguments);
							} finally {
								tmp ? define(this, 'base', tmp)
									: delete this.base;
							}
						};
						res.toString = function() {
							return val.toString();
						}
						res.valueOf = function() {
							return val.valueOf();
						}
					}
					if (beans && val.length == 0
							&& (bean = name.match(/^(get|is)(([A-Z])(.*))$/)))
						beans.push([ bean[3].toLowerCase() + bean[4], bean[2] ]);
				}
				if (!res || func || !res.get && !res.set)
					res = { value: res, writable: true };
				if ((describe(dest, name)
						|| { configurable: true }).configurable) {
					res.configurable = true;
					res.enumerable = enumerable;
				}
				define(dest, name, res);
			}
		}
		if (src) {
			beans = [];
			for (var name in src)
				if (has.call(src, name) && !hidden.test(name))
					field(name, null, true, generics);
			field('toString');
			field('valueOf');
			for (var i = 0, l = beans && beans.length; i < l; i++)
				try {
					var bean = beans[i], part = bean[1];
					field(bean[0], {
						get: dest['get' + part] || dest['is' + part],
						set: dest['set' + part]
					}, true);
				} catch (e) {}
		}
		return dest;
	}

	function extend(obj) {
		var ctor = function(dont) {
			if (fix) define(this, '__proto__', { value: obj });
			if (this.initialize && dont !== ctor.dont)
				return this.initialize.apply(this, arguments);
		}
		ctor.prototype = obj;
		ctor.toString = function() {
			return (this.prototype.initialize || function() {}).toString();
		}
		return ctor;
	}

	function iterator(iter) {
		return !iter
			? function(val) { return val }
			: typeof iter !== 'function'
				? function(val) { return val == iter }
				: iter;
	}

	function each(obj, iter, bind, asArray) {
		try {
			if (obj)
				(asArray || asArray === undefined && isArray(obj)
					? forEach : forIn).call(obj, iterator(iter),
						bind = bind || obj);
		} catch (e) {
			if (e !== Base.stop) throw e;
		}
		return bind;
	}

	function clone(obj) {
		return each(obj, function(val, i) {
			this[i] = val;
		}, new obj.constructor());
	}

	return inject(function() {}, {
		inject: function(src) {
			if (src) {
				var proto = this.prototype,
					base = proto.__proto__ && proto.__proto__.constructor,
					statics = src.statics == true ? src : src.statics;
				if (statics != src)
					inject(proto, src, src.enumerable, base && base.prototype,
							src.preserve, src.generics && this);
				inject(this, statics, true, base, src.preserve);
			}
			for (var i = 1, l = arguments.length; i < l; i++)
				this.inject(arguments[i]);
			return this;
		},

		extend: function(src) {
			var proto = new this(this.dont),
				ctor = extend(proto);
			define(proto, 'constructor',
					{ value: ctor, writable: true, configurable: true });
			ctor.dont = {};
			inject(ctor, this, true);
			return arguments.length ? this.inject.apply(ctor, arguments) : ctor;
		}
	}, true).inject({
		has: has,
		each: each,

		inject: function() {
			for (var i = 0, l = arguments.length; i < l; i++)
				inject(this, arguments[i]);
			return this;
		},

		extend: function() {
			var res = new (extend(this));
			return res.inject.apply(res, arguments);
		},

		each: function(iter, bind) {
			return each(this, iter, bind);
		},

		clone: function() {
			return clone(this);
		},

		statics: {
			each: each,
			clone: clone,
			define: define,
			describe: describe,
			iterator: iterator,

			has: function(obj, name) {
				return has.call(obj, name);
			},

			type: function(obj) {
				return (obj || obj === 0) && (obj._type || typeof obj) || null;
			},

			check: function(obj) {
				return !!(obj || obj === 0);
			},

			pick: function() {
				for (var i = 0, l = arguments.length; i < l; i++)
					if (arguments[i] !== undefined)
						return arguments[i];
				return null;
			},

			stop: {}
		}
	});
}

this.Base = Base.inject({
	generics: true,

	clone: function() {
		return new this.constructor(this);
	},

	toString: function() {
		return '{ ' + Base.each(this, function(value, key) {
			if (key.charAt(0) != '_') {
				var type = typeof value;
				this.push(key + ': ' + (type === 'number'
						? Base.formatNumber(value)
						: type === 'string' ? "'" + value + "'" : value));
			}
		}, []).join(', ') + ' }';
	},

	statics: {
		read: function(list, start, length) {
			var start = start || 0,
				length = length || list.length - start;
			var obj = list[start];
			if (obj instanceof this
					|| this.prototype._readNull && obj == null && length <= 1)
				return obj;
			obj = new this(this.dont);
			return obj.initialize.apply(obj, start > 0 || length < list.length
				? Array.prototype.slice.call(list, start, start + length)
				: list) || obj;
		},

		readAll: function(list, start) {
			var res = [], entry;
			for (var i = start || 0, l = list.length; i < l; i++) {
				res.push(Array.isArray(entry = list[i])
					? this.read(entry, 0)
					: this.read(list, i, 1));
			}
			return res;
		},

		splice: function(list, items, index, remove) {
			var amount = items && items.length,
				append = index === undefined;
			index = append ? list.length : index;
			for (var i = 0; i < amount; i++)
				items[i]._index = index + i;
			if (append) {
				list.push.apply(list, items);
				return [];
			} else {
				var args = [index, remove];
				if (items)
					args.push.apply(args, items);
				var removed = list.splice.apply(list, args);
				for (var i = 0, l = removed.length; i < l; i++)
					delete removed[i]._index;
				for (var i = index + amount, l = list.length; i < l; i++)
					list[i]._index = i;
				return removed;
			}
		},

		merge: function() {
			return Base.each(arguments, function(hash) {
				Base.each(hash, function(value, key) {
					this[key] = value;
				}, this);
			}, new Base(), true); 
		},

		capitalize: function(str) {
			return str.replace(/\b[a-z]/g, function(match) {
				return match.toUpperCase();
			});
		},

		camelize: function(str) {
			return str.replace(/-(\w)/g, function(all, chr) {
				return chr.toUpperCase();
			});
		},

		hyphenate: function(str) {
			return str.replace(/[a-z][A-Z0-9]|[0-9][a-zA-Z]|[A-Z]{2}[a-z]/g,
				function(match) {
					return match.charAt(0) + '-' + match.substring(1);
				}
			).toLowerCase();
		},

		formatNumber: function(num) {
			return (Math.round(num * 100000) / 100000).toString();
		}
	}
});

var PaperScope = this.PaperScope = Base.extend({

	initialize: function(script) {
		paper = this;
		this.view = null;
		this.views = [];
		this.project = null;
		this.projects = [];
		this.tool = null;
		this.tools = [];
		this._id = script && (script.getAttribute('id') || script.src)
				|| ('paperscope-' + (PaperScope._id++));
		if (script)
			script.setAttribute('id', this._id);
		PaperScope._scopes[this._id] = this;
	},

	version: 0.21,

	evaluate: function(code) {
		var res = PaperScript.evaluate(code, this);
		View.updateFocus();
		return res;
	},

	install: function(scope) {
		var that = this;
		Base.each(['project', 'view', 'tool'], function(key) {
			Base.define(scope, key, {
				configurable: true,
				writable: true,
				get: function() {
					return that[key];
				}
			});
		});
		for (var key in this) {
			if (!/^(version|_id|load)/.test(key) && !(key in scope))
				scope[key] = this[key];
		}
	},

	setup: function(canvas) {
		paper = this;
		this.project = new Project();
		if (canvas)
			this.view = new View(canvas);
	},

	clear: function() {
		for (var i = this.projects.length - 1; i >= 0; i--)
			this.projects[i].remove();
		for (var i = this.views.length - 1; i >= 0; i--)
			this.views[i].remove();
		for (var i = this.tools.length - 1; i >= 0; i--)
			this.tools[i].remove();
	},

	remove: function() {
		this.clear();
		delete PaperScope._scopes[this._id];
	},

	_needsRedraw: function() {
		if (!this._redrawNotified) {
			for (var i = this.views.length - 1; i >= 0; i--)
				this.views[i]._redrawNeeded = true;
			this._redrawNotified = true;
		}
	},

	statics: {
		_scopes: {},
		_id: 0,

		get: function(id) {
			if (typeof id === 'object')
				id = id.getAttribute('id');
			return this._scopes[id] || null;
		},

		each: function(iter) {
			Base.each(this._scopes, iter);
		}
	}
});

var PaperScopeItem = Base.extend({

	initialize: function(activate) {
		this._scope = paper;
		this._index = this._scope[this._list].push(this) - 1;
		if (activate || !this._scope[this._reference])
			this.activate();
	},

	activate: function() {
		if (!this._scope)
			return false;
		this._scope[this._reference] = this;
		return true;
	},

	remove: function() {
		if (this._index == null)
			return false;
		Base.splice(this._scope[this._list], null, this._index, 1);
		if (this._scope[this._reference] == this)
			this._scope[this._reference] = null;
		this._scope = null;
		return true;
	}
});

var Point = this.Point = Base.extend({
	initialize: function(arg0, arg1) {
		if (arg1 !== undefined) {
			this.x = arg0;
			this.y = arg1;
		} else if (arg0 !== undefined) {
			if (arg0 == null) {
				this.x = this.y = 0;
			} else if (arg0.x !== undefined) {
				this.x = arg0.x;
				this.y = arg0.y;
			} else if (arg0.width !== undefined) {
				this.x = arg0.width;
				this.y = arg0.height;
			} else if (Array.isArray(arg0)) {
				this.x = arg0[0];
				this.y = arg0.length > 1 ? arg0[1] : arg0[0];
			} else if (arg0.angle !== undefined) {
				this.x = arg0.length;
				this.y = 0;
				this.setAngle(arg0.angle);
			} else if (typeof arg0 === 'number') {
				this.x = this.y = arg0;
			} else {
				this.x = this.y = 0;
			}
		} else {
			this.x = this.y = 0;
		}
	},

	set: function(x, y) {
		this.x = x;
		this.y = y;
		return this;
	},

	clone: function() {
		return Point.create(this.x, this.y);
	},

	toString: function() {
		var format = Base.formatNumber;
		return '{ x: ' + format(this.x) + ', y: ' + format(this.y) + ' }';
	},

	add: function(point) {
		point = Point.read(arguments);
		return Point.create(this.x + point.x, this.y + point.y);
	},

	subtract: function(point) {
		point = Point.read(arguments);
		return Point.create(this.x - point.x, this.y - point.y);
	},

	multiply: function(point) {
		point = Point.read(arguments);
		return Point.create(this.x * point.x, this.y * point.y);
	},

	divide: function(point) {
		point = Point.read(arguments);
		return Point.create(this.x / point.x, this.y / point.y);
	},

	modulo: function(point) {
		point = Point.read(arguments);
		return Point.create(this.x % point.x, this.y % point.y);
	},

	negate: function() {
		return Point.create(-this.x, -this.y);
	},

	transform: function(matrix) {
		return matrix ? matrix._transformPoint(this) : this;
	},

	getDistance: function(point, squared) {
		point = Point.read(arguments);
		var x = point.x - this.x,
			y = point.y - this.y,
			d = x * x + y * y;
		return squared ? d : Math.sqrt(d);
	},

	getLength: function() {
		var l = this.x * this.x + this.y * this.y;
		return arguments[0] ? l : Math.sqrt(l);
	},

	setLength: function(length) {
		if (this.isZero()) {
			var angle = this._angle || 0;
			this.set(
				Math.cos(angle) * length,
				Math.sin(angle) * length
			);
		} else {
			var scale = length / this.getLength();
			if (scale == 0)
				this.getAngle();
			this.set(
				this.x * scale,
				this.y * scale
			);
		}
		return this;
	},

	normalize: function(length) {
		if (length === undefined)
			length = 1;
		var current = this.getLength(),
			scale = current != 0 ? length / current : 0,
			point = Point.create(this.x * scale, this.y * scale);
		point._angle = this._angle;
		return point;
	},

	getAngle: function() {
		return this.getAngleInRadians(arguments[0]) * 180 / Math.PI;
	},

	setAngle: function(angle) {
		angle = this._angle = angle * Math.PI / 180;
		if (!this.isZero()) {
			var length = this.getLength();
			this.set(
				Math.cos(angle) * length,
				Math.sin(angle) * length
			);
		}
		return this;
	},

	getAngleInRadians: function() {
		if (arguments[0] === undefined) {
			if (this._angle == null)
				this._angle = Math.atan2(this.y, this.x);
			return this._angle;
		} else {
			var point = Point.read(arguments),
				div = this.getLength() * point.getLength();
			if (div == 0) {
				return NaN;
			} else {
				return Math.acos(this.dot(point) / div);
			}
		}
	},

	getAngleInDegrees: function() {
		return this.getAngle(arguments[0]);
	},

	getQuadrant: function() {
		return this.x >= 0 ? this.y >= 0 ? 1 : 4 : this.y >= 0 ? 2 : 3;
	},

	getDirectedAngle: function(point) {
		point = Point.read(arguments);
		return Math.atan2(this.cross(point), this.dot(point)) * 180 / Math.PI;
	},

	rotate: function(angle, center) {
		angle = angle * Math.PI / 180;
		var point = center ? this.subtract(center) : this,
			s = Math.sin(angle),
			c = Math.cos(angle);
		point = Point.create(
			point.x * c - point.y * s,
			point.y * c + point.x * s
		);
		return center ? point.add(center) : point;
	},

	equals: function(point) {
		point = Point.read(arguments);
		return this.x == point.x && this.y == point.y;
	},

	isInside: function(rect) {
		return rect.contains(this);
	},

	isClose: function(point, tolerance) {
		return this.getDistance(point) < tolerance;
	},

	isColinear: function(point) {
		return this.cross(point) < Numerical.TOLERANCE;
	},

	isOrthogonal: function(point) {
		return this.dot(point) < Numerical.TOLERANCE;
	},

	isZero: function() {
		return this.x == 0 && this.y == 0;
	},

	isNaN: function() {
		return isNaN(this.x) || isNaN(this.y);
	},

	dot: function(point) {
		point = Point.read(arguments);
		return this.x * point.x + this.y * point.y;
	},

	cross: function(point) {
		point = Point.read(arguments);
		return this.x * point.y - this.y * point.x;
	},

	project: function(point) {
		point = Point.read(arguments);
		if (point.isZero()) {
			return Point.create(0, 0);
		} else {
			var scale = this.dot(point) / point.dot(point);
			return Point.create(
				point.x * scale,
				point.y * scale
			);
		}
	},

	statics: {
		create: function(x, y) {
			var point = new Point(Point.dont);
			point.x = x;
			point.y = y;
			return point;
		},

		min: function(point1, point2) {
			point1 = Point.read(arguments, 0, 1);
			point2 = Point.read(arguments, 1, 1);
			return Point.create(
				Math.min(point1.x, point2.x),
				Math.min(point1.y, point2.y)
			);
		},

		max: function(point1, point2) {
			point1 = Point.read(arguments, 0, 1);
			point2 = Point.read(arguments, 1, 1);
			return Point.create(
				Math.max(point1.x, point2.x),
				Math.max(point1.y, point2.y)
			);
		},

		random: function() {
			return Point.create(Math.random(), Math.random());
		}
	}
}, new function() { 

	return Base.each(['round', 'ceil', 'floor', 'abs'], function(name) {
		var op = Math[name];
		this[name] = function() {
			return Point.create(op(this.x), op(this.y));
		};
	}, {});
});

var LinkedPoint = Point.extend({
	set: function(x, y, dontNotify) {
		this._x = x;
		this._y = y;
		if (!dontNotify)
			this._owner[this._setter](this);
		return this;
	},

	getX: function() {
		return this._x;
	},

	setX: function(x) {
		this._x = x;
		this._owner[this._setter](this);
	},

	getY: function() {
		return this._y;
	},

	setY: function(y) {
		this._y = y;
		this._owner[this._setter](this);
	},

	statics: {
		create: function(owner, setter, x, y, dontLink) {
			if (dontLink)
				return Point.create(x, y);
			var point = new LinkedPoint(LinkedPoint.dont);
			point._x = x;
			point._y = y;
			point._owner = owner;
			point._setter = setter;
			return point;
		}
	}
});

var Size = this.Size = Base.extend({
	initialize: function(arg0, arg1) {
		if (arg1 !== undefined) {
			this.width = arg0;
			this.height = arg1;
		} else if (arg0 !== undefined) {
			if (arg0 == null) {
				this.width = this.height = 0;
			} else if (arg0.width !== undefined) {
				this.width = arg0.width;
				this.height = arg0.height;
			} else if (arg0.x !== undefined) {
				this.width = arg0.x;
				this.height = arg0.y;
			} else if (Array.isArray(arg0)) {
				this.width = arg0[0];
				this.height = arg0.length > 1 ? arg0[1] : arg0[0];
			} else if (typeof arg0 === 'number') {
				this.width = this.height = arg0;
			} else {
				this.width = this.height = 0;
			}
		} else {
			this.width = this.height = 0;
		}
	},

	toString: function() {
		var format = Base.formatNumber;
		return '{ width: ' + format(this.width)
				+ ', height: ' + format(this.height) + ' }';
	},

	set: function(width, height) {
		this.width = width;
		this.height = height;
		return this;
	},

	clone: function() {
		return Size.create(this.width, this.height);
	},

	add: function(size) {
		size = Size.read(arguments);
		return Size.create(this.width + size.width, this.height + size.height);
	},

	subtract: function(size) {
		size = Size.read(arguments);
		return Size.create(this.width - size.width, this.height - size.height);
	},

	multiply: function(size) {
		size = Size.read(arguments);
		return Size.create(this.width * size.width, this.height * size.height);
	},

	divide: function(size) {
		size = Size.read(arguments);
		return Size.create(this.width / size.width, this.height / size.height);
	},

	modulo: function(size) {
		size = Size.read(arguments);
		return Size.create(this.width % size.width, this.height % size.height);
	},

	negate: function() {
		return Size.create(-this.width, -this.height);
	},

	equals: function(size) {
		size = Size.read(arguments);
		return this.width == size.width && this.height == size.height;
	},

	isZero: function() {
		return this.width == 0 && this.height == 0;
	},

	isNaN: function() {
		return isNaN(this.width) || isNaN(this.height);
	},

	statics: {
		create: function(width, height) {
			return new Size(Size.dont).set(width, height);
		},

		min: function(size1, size2) {
			return Size.create(
				Math.min(size1.width, size2.width),
				Math.min(size1.height, size2.height));
		},

		max: function(size1, size2) {
			return Size.create(
				Math.max(size1.width, size2.width),
				Math.max(size1.height, size2.height));
		},

		random: function() {
			return Size.create(Math.random(), Math.random());
		}
	}
}, new function() { 

	return Base.each(['round', 'ceil', 'floor', 'abs'], function(name) {
		var op = Math[name];
		this[name] = function() {
			return Size.create(op(this.width), op(this.height));
		};
	}, {});
});

var LinkedSize = Size.extend({
	set: function(width, height, dontNotify) {
		this._width = width;
		this._height = height;
		if (!dontNotify)
			this._owner[this._setter](this);
		return this;
	},

	getWidth: function() {
		return this._width;
	},

	setWidth: function(width) {
		this._width = width;
		this._owner[this._setter](this);
	},

	getHeight: function() {
		return this._height;
	},

	setHeight: function(height) {
		this._height = height;
		this._owner[this._setter](this);
	},

	statics: {
		create: function(owner, setter, width, height, dontLink) {
			if (dontLink)
				return Size.create(width, height);
			var size = new LinkedSize(LinkedSize.dont);
			size._width = width;
			size._height = height;
			size._owner = owner;
			size._setter = setter;
			return size;
		}
	}
});

var Rectangle = this.Rectangle = Base.extend({
	initialize: function(arg0, arg1, arg2, arg3) {
		if (arguments.length == 4) {
			this.x = arg0;
			this.y = arg1;
			this.width = arg2;
			this.height = arg3;
		} else if (arguments.length == 2) {
			if (arg1 && arg1.x !== undefined) {
				var point1 = Point.read(arguments, 0, 1);
				var point2 = Point.read(arguments, 1, 1);
				this.x = point1.x;
				this.y = point1.y;
				this.width = point2.x - point1.x;
				this.height = point2.y - point1.y;
				if (this.width < 0) {
					this.x = point2.x;
					this.width = -this.width;
				}
				if (this.height < 0) {
					this.y = point2.y;
					this.height = -this.height;
				}
			} else {
				var point = Point.read(arguments, 0, 1);
				var size = Size.read(arguments, 1, 1);
				this.x = point.x;
				this.y = point.y;
				this.width = size.width;
				this.height = size.height;
			}
		} else if (arg0) {
			this.x = arg0.x || 0;
			this.y = arg0.y || 0;
			this.width = arg0.width || 0;
			this.height = arg0.height || 0;
		} else {
			this.x = this.y = this.width = this.height = 0;
		}
	},

	set: function(x, y, width, height) {
		this.x = x;
		this.y = y;
		this.width = width;
		this.height = height;
		return this;
	},

	getPoint: function() {
		return LinkedPoint.create(this, 'setPoint', this.x, this.y,
				arguments[0]);
	},

	setPoint: function(point) {
		point = Point.read(arguments);
		this.x = point.x;
		this.y = point.y;
		return this;
	},

	getSize: function() {
		return LinkedSize.create(this, 'setSize', this.width, this.height,
				arguments[0]);
	},

	setSize: function(size) {
		size = Size.read(arguments);
		this.width = size.width;
		this.height = size.height;
		return this;
	},

	getLeft: function() {
		return this.x;
	},

	setLeft: function(left) {
		this.width -= left - this.x;
		this.x = left;
		return this;
	},

	getTop: function() {
		return this.y;
	},

	setTop: function(top) {
		this.height -= top - this.y;
		this.y = top;
		return this;
	},

	getRight: function() {
		return this.x + this.width;
	},

	setRight: function(right) {
		this.width = right - this.x;
		return this;
	},

	getBottom: function() {
		return this.y + this.height;
	},

	setBottom: function(bottom) {
		this.height = bottom - this.y;
		return this;
	},

	getCenterX: function() {
		return this.x + this.width * 0.5;
	},

	setCenterX: function(x) {
		this.x = x - this.width * 0.5;
		return this;
	},

	getCenterY: function() {
		return this.y + this.height * 0.5;
	},

	setCenterY: function(y) {
		this.y = y - this.height * 0.5;
		return this;
	},

	getCenter: function() {
		return LinkedPoint.create(this, 'setCenter',
				this.getCenterX(), this.getCenterY(), arguments[0]);
	},

	setCenter: function(point) {
		point = Point.read(arguments);
		return this.setCenterX(point.x).setCenterY(point.y);
	},

	equals: function(rect) {
		rect = Rectangle.read(arguments);
		return this.x == rect.x && this.y == rect.y
				&& this.width == rect.width && this.height == rect.height;
	},

	isEmpty: function() {
		return this.width == 0 || this.height == 0;
	},

	toString: function() {
		var format = Base.formatNumber;
		return '{ x: ' + format(this.x)
				+ ', y: ' + format(this.y)
				+ ', width: ' + format(this.width)
				+ ', height: ' + format(this.height)
				+ ' }';
	},

	contains: function(arg) {
		return arg && arg.width !== undefined
				|| (Array.isArray(arg) ? arg : arguments).length == 4
				? this._containsRectangle(Rectangle.read(arguments))
				: this._containsPoint(Point.read(arguments));
	},

	_containsPoint: function(point) {
		var x = point.x,
			y = point.y;
		return x >= this.x && y >= this.y
				&& x <= this.x + this.width
				&& y <= this.y + this.height;
	},

	_containsRectangle: function(rect) {
		var x = rect.x,
			y = rect.y;
		return x >= this.x && y >= this.y
				&& x + rect.width <= this.x + this.width
				&& y + rect.height <= this.y + this.height;
	},

	intersects: function(rect) {
		rect = Rectangle.read(arguments);
		return rect.x + rect.width > this.x
				&& rect.y + rect.height > this.y
				&& rect.x < this.x + this.width
				&& rect.y < this.y + this.height;
	},

	intersect: function(rect) {
		rect = Rectangle.read(arguments);
		var x1 = Math.max(this.x, rect.x),
			y1 = Math.max(this.y, rect.y),
			x2 = Math.min(this.x + this.width, rect.x + rect.width),
			y2 = Math.min(this.y + this.height, rect.y + rect.height);
		return Rectangle.create(x1, y1, x2 - x1, y2 - y1);
	},

	unite: function(rect) {
		rect = Rectangle.read(arguments);
		var x1 = Math.min(this.x, rect.x),
			y1 = Math.min(this.y, rect.y),
			x2 = Math.max(this.x + this.width, rect.x + rect.width),
			y2 = Math.max(this.y + this.height, rect.y + rect.height);
		return Rectangle.create(x1, y1, x2 - x1, y2 - y1);
	},

	include: function(point) {
		point = Point.read(arguments);
		var x1 = Math.min(this.x, point.x),
			y1 = Math.min(this.y, point.y),
			x2 = Math.max(this.x + this.width, point.x),
			y2 = Math.max(this.y + this.height, point.y);
		return Rectangle.create(x1, y1, x2 - x1, y2 - y1);
	},

	expand: function(hor, ver) {
		if (ver === undefined)
			ver = hor;
		return Rectangle.create(this.x - hor / 2, this.y - ver / 2,
				this.width + hor, this.height + ver);
	},

	scale: function(hor, ver) {
		return this.expand(this.width * hor - this.width,
				this.height * (ver === undefined ? hor : ver) - this.height);
	},

	statics: {
		create: function(x, y, width, height) {
			return new Rectangle(Rectangle.dont).set(x, y, width, height);
		}
	}
}, new function() {
	return Base.each([
			['Top', 'Left'], ['Top', 'Right'],
			['Bottom', 'Left'], ['Bottom', 'Right'],
			['Left', 'Center'], ['Top', 'Center'],
			['Right', 'Center'], ['Bottom', 'Center']
		],
		function(parts, index) {
			var part = parts.join('');
			var xFirst = /^[RL]/.test(part);
			if (index >= 4)
				parts[1] += xFirst ? 'Y' : 'X';
			var x = parts[xFirst ? 0 : 1],
				y = parts[xFirst ? 1 : 0],
				getX = 'get' + x,
				getY = 'get' + y,
				setX = 'set' + x,
				setY = 'set' + y,
				get = 'get' + part,
				set = 'set' + part;
			this[get] = function() {
				return LinkedPoint.create(this, set,
						this[getX](), this[getY](), arguments[0]);
			};
			this[set] = function(point) {
				point = Point.read(arguments);
				return this[setX](point.x)[setY](point.y);
			};
		}, {});
});

var LinkedRectangle = Rectangle.extend({
	set: function(x, y, width, height, dontNotify) {
		this._x = x;
		this._y = y;
		this._width = width;
		this._height = height;
		if (!dontNotify)
			this._owner[this._setter](this);
		return this;
	},

	statics: {
		create: function(owner, setter, x, y, width, height) {
			var rect = new LinkedRectangle(LinkedRectangle.dont).set(
					x, y, width, height, true);
			rect._owner = owner;
			rect._setter = setter;
			return rect;
		}
	}
}, new function() {
	var proto = Rectangle.prototype;

	return Base.each(['x', 'y', 'width', 'height'], function(key) {
		var part = Base.capitalize(key);
		var internal = '_' + key;
		this['get' + part] = function() {
			return this[internal];
		};

		this['set' + part] = function(value) {
			this[internal] = value;
			if (!this._dontNotify)
				this._owner[this._setter](this);
		};
	}, Base.each(['Point', 'Size', 'Center',
			'Left', 'Top', 'Right', 'Bottom', 'CenterX', 'CenterY',
			'TopLeft', 'TopRight', 'BottomLeft', 'BottomRight',
			'LeftCenter', 'TopCenter', 'RightCenter', 'BottomCenter'],
		function(key) {
			var name = 'set' + key;
			this[name] = function(value) {
				this._dontNotify = true;
				proto[name].apply(this, arguments);
				delete this._dontNotify;
				this._owner[this._setter](this);
				return this;
			};
		}, {})
	);
});

var Matrix = this.Matrix = Base.extend({
	initialize: function(arg) {
		var count = arguments.length,
			ok = true;
		if (count == 6) {
			this.set.apply(this, arguments);
		} else if (count == 1) {
			if (arg instanceof Matrix) {
				this.set(arg._a, arg._c, arg._b, arg._d, arg._tx, arg._ty);
			} else if (Array.isArray(arg)) {
				this.set.apply(this, arg);
			} else {
				ok = false;
			}
		} else if (count == 0) {
			this._a = this._d = 1;
			this._c = this._b = this._tx = this._ty = 0;
		} else {
			ok = false;
		}
		if (!ok)
			throw new Error('Unsupported matrix parameters');
	},

	clone: function() {
		return Matrix.create(this._a, this._c, this._b, this._d,
				this._tx, this._ty);
	},

	set: function(a, c, b, d, tx, ty) {
		this._a = a;
		this._c = c;
		this._b = b;
		this._d = d;
		this._tx = tx;
		this._ty = ty;
		return this;
	},

	scale: function(hor, ver , center) {
		if (arguments.length < 2 || typeof ver === 'object') {
			center = Point.read(arguments, 1);
			ver = hor;
		} else {
			center = Point.read(arguments, 2);
		}
		if (center)
			this.translate(center);
		this._a *= hor;
		this._c *= hor;
		this._b *= ver;
		this._d *= ver;
		if (center)
			this.translate(center.negate());
		return this;
	},

	translate: function(point) {
		point = Point.read(arguments);
		var x = point.x, y = point.y;
		this._tx += x * this._a + y * this._b;
		this._ty += x * this._c + y * this._d;
		return this;
	},

	rotate: function(angle, center) {
		return this.concatenate(
				Matrix.getRotateInstance.apply(Matrix, arguments));
	},

	shear: function(hor, ver, center) {
		if (arguments.length < 2 || typeof ver === 'object') {
			center = Point.read(arguments, 1);
			ver = hor;
		} else {
			center = Point.read(arguments, 2);
		}
		if (center)
			this.translate(center);
		var a = this._a,
			c = this._c;
		this._a += ver * this._b;
		this._c += ver * this._d;
		this._b += hor * a;
		this._d += hor * c;
		if (center)
			this.translate(center.negate());
		return this;
	},

	toString: function() {
		var format = Base.formatNumber;
		return '[[' + [format(this._a), format(this._b),
					format(this._tx)].join(', ') + '], ['
				+ [format(this._c), format(this._d),
					format(this._ty)].join(', ') + ']]';
	},

	getValues: function() {
		return [ this._a, this._c, this._b, this._d, this._tx, this._ty ];
	},

	concatenate: function(mx) {
		var a = this._a,
			b = this._b,
			c = this._c,
			d = this._d;
		this._a = mx._a * a + mx._c * b;
		this._b = mx._b * a + mx._d * b;
		this._tx += mx._tx * a + mx._ty * b;
		this._c = mx._a * c + mx._c * d;
		this._d = mx._b * c + mx._d * d;
		this._ty += mx._tx * c + mx._ty * d;
		return this;
	},

	preConcatenate: function(mx) {
		var a = this._a,
			b = this._b,
			c = this._c,
			d = this._d,
			tx = this._tx,
			ty = this._ty;
		this._a = mx._a * a + mx._b * c;
		this._c = mx._c * a + mx._d * c;
		this._b = mx._a * b + mx._b * d;
		this._d = mx._c * b + mx._d * d;
		this._tx = mx._a * tx + mx._b * ty + mx._tx;
		this._ty = mx._c * tx + mx._d * ty + mx._ty;
		return this;
	},

	transform: function( src, srcOff, dst, dstOff, numPts) {
		return arguments.length < 5
			? this._transformPoint(Point.read(arguments))
			: this._transformCoordinates(src, srcOff, dst, dstOff, numPts);
	},

	_transformPoint: function(point, dest, dontNotify) {
		var x = point.x,
			y = point.y;
		if (!dest)
			dest = new Point(Point.dont);
		return dest.set(
			x * this._a + y * this._b + this._tx,
			x * this._c + y * this._d + this._ty,
			dontNotify
		);
	},

	_transformCoordinates: function(src, srcOff, dst, dstOff, numPts) {
		var i = srcOff, j = dstOff,
			srcEnd = srcOff + 2 * numPts;
		while (i < srcEnd) {
			var x = src[i++];
			var y = src[i++];
			dst[j++] = x * this._a + y * this._b + this._tx;
			dst[j++] = x * this._c + y * this._d + this._ty;
		}
		return dst;
	},

	_transformCorners: function(rect) {
		var x1 = rect.x,
			y1 = rect.y,
			x2 = x1 + rect.width,
			y2 = y1 + rect.height,
			coords = [ x1, y1, x2, y1, x2, y2, x1, y2 ];
		return this._transformCoordinates(coords, 0, coords, 0, 4);
	},

	_transformBounds: function(bounds) {
		var coords = this._transformCorners(bounds),
			min = coords.slice(0, 2),
			max = coords.slice(0);
		for (var i = 2; i < 8; i++) {
			var val = coords[i],
				j = i & 1;
			if (val < min[j])
				min[j] = val;
			else if (val > max[j])
				max[j] = val;
		}
		return Rectangle.create(min[0], min[1],
				max[0] - min[0], max[1] - min[1]);
	},

	getDeterminant: function() {
		return this._a * this._d - this._b * this._c;
	},

	getTranslation: function() {
		return new Point(this._tx, this._ty);
	},

	getScaling: function() {
		var hor = Math.sqrt(this._a * this._a + this._c * this._c),
			ver = Math.sqrt(this._b * this._b + this._d * this._d);
		return new Point(this._a < 0 ? -hor : hor, this._b < 0 ? -ver : ver);
	},

	getRotation: function() {
		var angle1 = -Math.atan2(this._b, this._d),
			angle2 = Math.atan2(this._c, this._a);
		return Math.abs(angle1 - angle2) < Numerical.TOLERANCE
				? angle1 * 180 / Math.PI : undefined;
	},

	isIdentity: function() {
		return this._a == 1 && this._c == 0 && this._b == 0 && this._d == 1
				&& this._tx == 0 && this._ty == 0;
	},

	isInvertible: function() {
		var det = this.getDeterminant();
		return isFinite(det) && det != 0 && isFinite(this._tx)
				&& isFinite(this._ty);
	},

	isSingular: function() {
		return !this.isInvertible();
	},

	createInverse: function() {
		var det = this.getDeterminant();
		if (isFinite(det) && det != 0 && isFinite(this._tx)
				&& isFinite(this._ty)) {
			return Matrix.create(
				this._d / det,
				-this._c / det,
				-this._b / det,
				this._a / det,
				(this._b * this._ty - this._d * this._tx) / det,
				(this._c * this._tx - this._a * this._ty) / det);
		}
		return null;
	},

	createShiftless: function() {
		return Matrix.create(this._a, this._c, this._b, this._d, 0, 0);
	},

	setToScale: function(hor, ver) {
		return this.set(hor, 0, 0, ver, 0, 0);
	},

	setToTranslation: function(delta) {
		delta = Point.read(arguments);
		return this.set(1, 0, 0, 1, delta.x, delta.y);
	},

	setToShear: function(hor, ver) {
		return this.set(1, ver, hor, 1, 0, 0);
	},

	setToRotation: function(angle, center) {
		center = Point.read(arguments, 1);
		angle = angle * Math.PI / 180;
		var x = center.x,
			y = center.y,
			cos = Math.cos(angle),
			sin = Math.sin(angle);
		return this.set(cos, sin, -sin, cos,
				x - x * cos + y * sin,
				y - x * sin - y * cos);
	},

	applyToContext: function(ctx, reset) {
		ctx[reset ? 'setTransform' : 'transform'](
				this._a, this._c, this._b, this._d, this._tx, this._ty);
		return this;
	},

	statics: {
		create: function(a, c, b, d, tx, ty) {
			return new Matrix(Matrix.dont).set(a, c, b, d, tx, ty);
		},

		getScaleInstance: function(hor, ver) {
			var mx = new Matrix();
			return mx.setToScale.apply(mx, arguments);
		},

		getTranslateInstance: function(delta) {
			var mx = new Matrix();
			return mx.setToTranslation.apply(mx, arguments);
		},

		getShearInstance: function(hor, ver, center) {
			var mx = new Matrix();
			return mx.setToShear.apply(mx, arguments);
		},

		getRotateInstance: function(angle, center) {
			var mx = new Matrix();
			return mx.setToRotation.apply(mx, arguments);
		}
	}
}, new function() {
	return Base.each({
		scaleX: '_a',
		scaleY: '_d',
		translateX: '_tx',
		translateY: '_ty',
		shearX: '_b',
		shearY: '_c'
	}, function(prop, name) {
		name = Base.capitalize(name);
		this['get' + name] = function() {
			return this[prop];
		};
		this['set' + name] = function(value) {
			this[prop] = value;
		};
	}, {});
});

var Line = this.Line = Base.extend({
	initialize: function(point1, point2, infinite) {
		point1 = Point.read(arguments, 0, 1);
		point2 = Point.read(arguments, 1, 1);
		if (arguments.length == 3) {
			this.point = point1;
			this.vector = point2.subtract(point1);
			this.infinite = infinite;
		} else {
			this.point = point1;
			this.vector = point2;
			this.infinite = true;
		}
	},

	intersect: function(line) {
		var cross = this.vector.cross(line.vector);
		if (Math.abs(cross) <= Numerical.EPSILON)
			return null;
		var v = line.point.subtract(this.point),
			t1 = v.cross(line.vector) / cross,
			t2 = v.cross(this.vector) / cross;
		return (this.infinite || 0 <= t1 && t1 <= 1)
				&& (line.infinite || 0 <= t2 && t2 <= 1)
			? this.point.add(this.vector.multiply(t1)) : null;
	},

	getSide: function(point) {
		var v1 = this.vector,
			v2 = point.subtract(this.point),
			ccw = v2.cross(v1);
		if (ccw == 0) {
			ccw = v2.dot(v1);
			if (ccw > 0) {
				ccw = v2.subtract(v1).dot(v1);
				if (ccw < 0)
				    ccw = 0;
			}
		}
		return ccw < 0 ? -1 : ccw > 0 ? 1 : 0;
	},

	getDistance: function(point) {
		var m = this.vector.y / this.vector.x, 
			b = this.point.y - (m * this.point.x); 
		var dist = Math.abs(point.y - (m * point.x) - b) / Math.sqrt(m * m + 1);
		return this.infinite ? dist : Math.min(dist,
				point.getDistance(this.point),
				point.getDistance(this.point.add(this.vector)));
	}
});

var Project = this.Project = PaperScopeItem.extend({
	_list: 'projects',
	_reference: 'project',

	initialize: function() {
		this.base(true);
		this._currentStyle = new PathStyle();
		this._selectedItems = {};
		this._selectedItemCount = 0;
		this.layers = [];
		this.symbols = [];
		this.activeLayer = new Layer();
	},

	_needsRedraw: function() {
		if (this._scope)
			this._scope._needsRedraw();
	},

	getCurrentStyle: function() {
		return this._currentStyle;
	},

	setCurrentStyle: function(style) {
		this._currentStyle.initialize(style);
	},

	getIndex: function() {
		return this._index;
	},

	getSelectedItems: function() {
		var items = [];
		Base.each(this._selectedItems, function(item) {
			items.push(item);
		});
		return items;
	},

	_updateSelection: function(item) {
		if (item._selected) {
			this._selectedItemCount++;
			this._selectedItems[item.getId()] = item;
		} else {
			this._selectedItemCount--;
			delete this._selectedItems[item.getId()];
		}
	},

	selectAll: function() {
		for (var i = 0, l = this.layers.length; i < l; i++)
			this.layers[i].setSelected(true);
	},

	deselectAll: function() {
		for (var i in this._selectedItems)
			this._selectedItems[i].setSelected(false);
	},

	hitTest: function(point, options) {
		options = HitResult.getOptions(point, options);
		point = options.point;
		for (var i = this.layers.length - 1; i >= 0; i--) {
			var res = this.layers[i].hitTest(point, options);
			if (res) return res;
		}
		return null;
	},

	draw: function(ctx) {
		ctx.save();
		var param = { offset: new Point(0, 0) };
		for (var i = 0, l = this.layers.length; i < l; i++)
			Item.draw(this.layers[i], ctx, param);
		ctx.restore();

		if (this._selectedItemCount > 0) {
			ctx.save();
			ctx.strokeWidth = 1;
			ctx.strokeStyle = ctx.fillStyle = '#009dec';
			param = { selection: true };
			Base.each(this._selectedItems, function(item) {
				item.draw(ctx, param);
			});
			ctx.restore();
		}
	}
});

var Symbol = this.Symbol = Base.extend({
	initialize: function(item) {
		this.project = paper.project;
		this.project.symbols.push(this);
		this.setDefinition(item);
		this._instances = {};
	},

	_changed: function(flags) {
		Base.each(this._instances, function(item) {
			item._changed(flags);
		});
	},

	getDefinition: function() {
		return this._definition;
	},

	setDefinition: function(item) {
		if (item._parentSymbol)
			item = item.clone();
		if (this._definition)
			delete this._definition._parentSymbol;
		this._definition = item;
		item.remove();
		item.setPosition(new Point());
		item._parentSymbol = this;
		this._changed(Change.GEOMETRY);
	},

	place: function(position) {
		return new PlacedSymbol(this, position);
	},

	clone: function() {
	 	return new Symbol(this._definition.clone());
	}
});

var ChangeFlag = {
	APPEARANCE: 1,
	HIERARCHY: 2,
	GEOMETRY: 4,
	STROKE: 8,
	STYLE: 16,
	ATTRIBUTE: 32,
	CONTENT: 64,
	PIXELS: 128,
	CLIPPING: 256
};

var Change = {
	HIERARCHY: ChangeFlag.HIERARCHY | ChangeFlag.APPEARANCE,
	GEOMETRY: ChangeFlag.GEOMETRY | ChangeFlag.APPEARANCE,
	STROKE: ChangeFlag.STROKE | ChangeFlag.STYLE | ChangeFlag.APPEARANCE,
	STYLE: ChangeFlag.STYLE | ChangeFlag.APPEARANCE,
	ATTRIBUTE: ChangeFlag.ATTRIBUTE | ChangeFlag.APPEARANCE,
	CONTENT: ChangeFlag.CONTENT | ChangeFlag.APPEARANCE,
	PIXELS: ChangeFlag.PIXELS | ChangeFlag.APPEARANCE
};

var Item = this.Item = Base.extend({
	initialize: function() {
		this._id = ++Item._id;
		if (!this._project)
			paper.project.activeLayer.addChild(this);
		this._style = PathStyle.create(this);
		this.setStyle(this._project.getCurrentStyle());
	},

	_changed: function(flags) {
		if (flags & ChangeFlag.GEOMETRY) {
			delete this._bounds;
			delete this._position;
		}
		if (flags & ChangeFlag.APPEARANCE) {
			this._project._needsRedraw();
		}
		if (this._parentSymbol)
			this._parentSymbol._changed(flags);
	},

	getId: function() {
		return this._id;
	},

	getName: function() {
		return this._name;
	},

	setName: function(name) {

		if (this._name)
			this._removeFromNamed();
		this._name = name || undefined;
		if (name) {
			var children = this._parent._children,
				namedChildren = this._parent._namedChildren;
			(namedChildren[name] = namedChildren[name] || []).push(this);
			children[name] = this;
		}
		this._changed(ChangeFlag.ATTRIBUTE);
	},

	getPosition: function() {
		var pos = this._position
				|| (this._position = this.getBounds().getCenter());
		return LinkedPoint.create(this, 'setPosition', pos._x, pos._y);
	},

	setPosition: function(point) {
		this.translate(Point.read(arguments).subtract(this.getPosition()));
	},

	getStyle: function() {
		return this._style;
	},

	setStyle: function(style) {
		this._style.initialize(style);
	},

	statics: {
		_id: 0
	}
}, new function() { 
	return Base.each(['locked', 'visible', 'blendMode', 'opacity', 'guide'],
		function(name) {
			var part = Base.capitalize(name),
				name = '_' + name;
			this['get' + part] = function() {
				return this[name];
			};
			this['set' + part] = function(value) {
				if (value != this[name]) {
					this[name] = value;
					this._changed(name === '_locked'
							? ChangeFlag.ATTRIBUTE : Change.ATTRIBUTE);
				}
			};
		}, {});
}, {

	_locked: false,

	_visible: true,

	_blendMode: 'normal',

	_opacity: 1,

	_guide: false,

	isSelected: function() {
		if (this._children) {
			for (var i = 0, l = this._children.length; i < l; i++)
				if (this._children[i].isSelected())
					return true;
		}
		return this._selected;
	},

	setSelected: function(selected) {
		if (this._children) {
			for (var i = 0, l = this._children.length; i < l; i++) {
				this._children[i].setSelected(selected);
			}
		} else if ((selected = !!selected) != this._selected) {
			this._selected = selected;
			this._project._updateSelection(this);
			this._changed(Change.ATTRIBUTE);
		}
	},

	_selected: false,

	isFullySelected: function() {
		if (this._children && this._selected) {
			for (var i = 0, l = this._children.length; i < l; i++)
				if (!this._children[i].isFullySelected())
					return false;
			return true;
		}
		return this._selected;
	},

	setFullySelected: function(selected) {
		if (this._children) {
			for (var i = 0, l = this._children.length; i < l; i++) {
				this._children[i].setFullySelected(selected);
			}
		}
		this.setSelected(selected);
	},

	isClipMask: function() {
		return this._clipMask;
	},

	setClipMask: function(clipMask) {
		if (this._clipMask != (clipMask = !!clipMask)) {
			this._clipMask = clipMask;
			if (clipMask) {
				this.setFillColor(null);
				this.setStrokeColor(null);
			}
			this._changed(Change.ATTRIBUTE);
			if (this._parent)
				this._parent._changed(ChangeFlag.CLIPPING);
		}
	},

	_clipMask: false,

	getProject: function() {
		return this._project;
	},

	_setProject: function(project) {
		if (this._project != project) {
			this._project = project;
			if (this._children) {
				for (var i = 0, l = this._children.length; i < l; i++) {
					this._children[i]._setProject(project);
				}
			}
		}
	},

	getParent: function() {
		return this._parent;
	},

	getChildren: function() {
		return this._children;
	},

	setChildren: function(items) {
		this.removeChildren();
		this.addChildren(items);
	},

	getFirstChild: function() {
		return this._children && this._children[0] || null;
	},

	getLastChild: function() {
		return this._children && this._children[this._children.length - 1]
				|| null;
	},

	getNextSibling: function() {
		return this._parent && this._parent._children[this._index + 1] || null;
	},

	getPreviousSibling: function() {
		return this._parent && this._parent._children[this._index - 1] || null;
	},

	getIndex: function() {
		return this._index;
	},

	clone: function() {
		return this._clone(new this.constructor());
	},

	_clone: function(copy) {
		copy.setStyle(this._style);
		if (this._children) {
			for (var i = 0, l = this._children.length; i < l; i++)
				copy.addChild(this._children[i].clone());
		}
		var keys = ['_locked', '_visible', '_blendMode', '_opacity',
				'_clipMask', '_guide'];
		for (var i = 0, l = keys.length; i < l; i++) {
			var key = keys[i];
			if (this.hasOwnProperty(key))
				copy[key] = this[key];
		}
		copy.setSelected(this._selected);
		if (this._name)
			copy.setName(this._name);
		return copy;
	},

	copyTo: function(itemOrProject) {
		var copy = this.clone();
		if (itemOrProject.layers) {
			itemOrProject.activeLayer.addChild(copy);
		} else {
			itemOrProject.addChild(copy);
		}
		return copy;
	},

	rasterize: function(resolution) {
		var bounds = this.getStrokeBounds(),
			scale = (resolution || 72) / 72,
			canvas = CanvasProvider.getCanvas(bounds.getSize().multiply(scale)),
			ctx = canvas.getContext('2d'),
			matrix = new Matrix().scale(scale).translate(-bounds.x, -bounds.y);
		matrix.applyToContext(ctx);
		this.draw(ctx, {});
		var raster = new Raster(canvas);
		raster.setBounds(bounds);
		return raster;
	},

	hitTest: function(point, options, matrix) {
		options = HitResult.getOptions(point, options);
		point = options.point;
		if (!this._children && !this.getRoughBounds(matrix)
				.expand(options.tolerance)._containsPoint(point))
			return null;
		if ((options.center || options.bounds) &&
				!(this instanceof Layer && !this._parent)) {
			var bounds = this.getBounds(),
				that = this,
				points = ['TopLeft', 'TopRight', 'BottomLeft', 'BottomRight',
				'LeftCenter', 'TopCenter', 'RightCenter', 'BottomCenter'],
				res;
			function checkBounds(type, part) {
				var pt = bounds['get' + part]().transform(matrix);
				if (point.getDistance(pt) < options.tolerance)
					return new HitResult(type, that,
							{ name: Base.hyphenate(part), point: pt });
			}
			if (options.center && (res = checkBounds('center', 'Center')))
				return res;
			if (options.bounds) {
				for (var i = 0; i < 8; i++)
					if (res = checkBounds('bounds', points[i]))
						return res;
			}
		}

		return this._children || !(options.guides && !this._guide
				|| options.selected && !this._selected)
					? this._hitTest(point, options, matrix) : null;
	},

	_hitTest: function(point, options, matrix) {
		if (this._children) {
			for (var i = this._children.length - 1; i >= 0; i--) {
				var res = this._children[i].hitTest(point, options, matrix);
				if (res) return res;
			}
		}
	},

	addChild: function(item) {
		return this.insertChild(undefined, item);
	},

	insertChild: function(index, item) {
		if (this._children) {
			item._remove(false, true);
			Base.splice(this._children, [item], index, 0);
			item._parent = this;
			item._setProject(this._project);
			if (item._name)
				item.setName(item._name);
			this._changed(Change.HIERARCHY);
			return true;
		}
		return false;
	},

	addChildren: function(items) {
		for (var i = 0, l = items && items.length; i < l; i++)
			this.insertChild(undefined, items[i]);
	},

	insertChildren: function(index, items) {
		for (var i = 0, l = items && items.length; i < l; i++) {
			if (this.insertChild(index, items[i]))
				index++;
		}
	},

	insertAbove: function(item) {
		return item._parent && item._parent.insertChild(
				item._index + 1, this);
	},

	insertBelow: function(item) {
		return item._parent && item._parent.insertChild(
				item._index - 1, this);
	},

	appendTop: function(item) {
		return this.addChild(item);
	},

	appendBottom: function(item) {
		return this.insertChild(0, item);
	},

	moveAbove: function(item) {
		return this.insertAbove(item);
	},

	moveBelow: function(item) {
		return this.insertBelow(item);
	},

	_removeFromNamed: function() {
		var children = this._parent._children,
			namedChildren = this._parent._namedChildren,
			name = this._name,
			namedArray = namedChildren[name],
			index = namedArray ? namedArray.indexOf(this) : -1;
		if (index == -1)
			return;
		if (children[name] == this)
			delete children[name];
		namedArray.splice(index, 1);
		if (namedArray.length) {
			children[name] = namedArray[namedArray.length - 1];
		} else {
			delete namedChildren[name];
		}
	},

	_remove: function(deselect, notify) {
		if (this._parent) {
			if (deselect)
				this.setSelected(false);
			if (this._name)
				this._removeFromNamed();
			Base.splice(this._parent._children, null, this._index, 1);
			if (notify)
				this._parent._changed(Change.HIERARCHY);
			this._parent = null;
			return true;
		}
		return false;
	},

	remove: function() {
		return this._remove(true, true);
	},

	removeChildren: function(from, to) {
		if (!this._children)
			return null;
		from = from || 0;
	 	to = Base.pick(to, this._children.length);
		var removed = this._children.splice(from, to - from);
		for (var i = removed.length - 1; i >= 0; i--)
			removed[i]._remove(true, false);
		if (removed.length > 0)
			this._changed(Change.HIERARCHY);
		return removed;
	},

	reverseChildren: function() {
		if (this._children) {
			this._children.reverse();
			for (var i = 0, l = this._children.length; i < l; i++)
				this._children[i]._index = i;
			this._changed(Change.HIERARCHY);
		}
	},

	isEditable: function() {
		var item = this;
		while (item) {
			if (!item._visible || item._locked)
				return false;
			item = item._parent;
		}
		return true;
	},

	_getOrder: function(item) {
		function getList(item) {
			var list = [];
			do {
				list.unshift(item);
			} while (item = item._parent)
			return list;
		}
		var list1 = getList(this),
			list2 = getList(item);
		for (var i = 0, l = Math.min(list1.length, list2.length); i < l; i++) {
			if (list1[i] != list2[i]) {
				return list1[i]._index < list2[i]._index ? 1 : -1;
			}
		}
		return 0;
	},

	hasChildren: function() {
		return this._children && this._children.length > 0;
	},

	isAbove: function(item) {
		return this._getOrder(item) == -1;
	},

	isBelow: function(item) {
		return this._getOrder(item) == 1;
	},

	isParent: function(item) {
		return this._parent == item;
	},

	isChild: function(item) {
		return item && item._parent == this;
	},

	isDescendant: function(item) {
		var parent = this;
		while (parent = parent._parent) {
			if (parent == item)
				return true;
		}
		return false;
	},

	isAncestor: function(item) {
		return item ? item.isDescendant(this) : false;
	},

	isGroupedWith: function(item) {
		var parent = this._parent;
		while (parent) {
			if (parent._parent
				&& (parent instanceof Group || parent instanceof CompoundPath)
				&& item.isDescendant(parent))
					return true;
			parent = parent._parent;
		}
		return false;
	},

	_getBounds: function(getter, cacheName, args) {
		var children = this._children;
		if (!children || children.length == 0)
			return new Rectangle();
		var x1 = Infinity,
			x2 = -x1,
			y1 = x1,
			y2 = x2;
		for (var i = 0, l = children.length; i < l; i++) {
			var child = children[i];
			if (child._visible) {
				var rect = child[getter](args[0]);
				x1 = Math.min(rect.x, x1);
				y1 = Math.min(rect.y, y1);
				x2 = Math.max(rect.x + rect.width, x2);
				y2 = Math.max(rect.y + rect.height, y2);
			}
		}
		var bounds = Rectangle.create(x1, y1, x2 - x1, y2 - y1);
		return getter == 'getBounds' ? this._createBounds(bounds) : bounds;
	},

	_createBounds: function(rect) {
		return LinkedRectangle.create(this, 'setBounds',
				rect.x, rect.y, rect.width, rect.height);
	},

	getBounds: function() {
		return this._getBounds('getBounds', '_bounds', arguments);
	},

	setBounds: function(rect) {
		rect = Rectangle.read(arguments);
		var bounds = this.getBounds(),
			matrix = new Matrix(),
			center = rect.getCenter();
		matrix.translate(center);
		if (rect.width != bounds.width || rect.height != bounds.height) {
			matrix.scale(
					bounds.width != 0 ? rect.width / bounds.width : 1,
					bounds.height != 0 ? rect.height / bounds.height : 1);
		}
		center = bounds.getCenter();
		matrix.translate(-center.x, -center.y);
		this.transform(matrix);
	},

	getStrokeBounds: function() {
		return this._getBounds('getStrokeBounds', '_strokeBounds', arguments);
	},

	getHandleBounds: function() {
		return this._getBounds('getHandleBounds', '_handleBounds', arguments);
	},

	getRoughBounds: function() {
		return this._getBounds('getRoughBounds', '_roughBounds', arguments);
	},

	scale: function(hor, ver , center) {
		if (arguments.length < 2 || typeof ver === 'object') {
			center = ver;
			ver = hor;
		}
		return this.transform(new Matrix().scale(hor, ver,
				center || this.getPosition()));
	},

	translate: function(delta) {
		var mx = new Matrix();
		return this.transform(mx.translate.apply(mx, arguments));
	},

	rotate: function(angle, center) {
		return this.transform(new Matrix().rotate(angle,
				center || this.getPosition()));
	},

	shear: function(hor, ver, center) {
		if (arguments.length < 2 || typeof ver === 'object') {
			center = ver;
			ver = hor;
		}
		return this.transform(new Matrix().shear(hor, ver,
				center || this.getPosition()));
	},

	transform: function(matrix, flags) {
		var bounds = this._bounds,
			position = this._position,
			children = this._children;
		if (this._transform) {
			this._transform(matrix, flags);
			this._changed(Change.GEOMETRY);
		}
		if (bounds && matrix.getRotation() % 90 === 0) {
			this._bounds = this._createBounds(
					matrix._transformBounds(bounds));
			this._position = this._bounds.getCenter();
		} else if (position) {
			this._position = matrix._transformPoint(position, position, true);
		}
		for (var i = 0, l = children && children.length; i < l; i++)
			children[i].transform(matrix, flags);
		return this;
	},

	fitBounds: function(rectangle, fill) {
		rectangle = Rectangle.read(arguments);
		var bounds = this.getBounds(),
			itemRatio = bounds.height / bounds.width,
			rectRatio = rectangle.height / rectangle.width,
			scale = (fill ? itemRatio > rectRatio : itemRatio < rectRatio)
					? rectangle.width / bounds.width
					: rectangle.height / bounds.height,
			delta = rectangle.getCenter().subtract(bounds.getCenter()),
			newBounds = new Rectangle(new Point(),
					new Size(bounds.width * scale, bounds.height * scale));
		newBounds.setCenter(rectangle.getCenter());
		this.setBounds(newBounds);
	},

	toString: function() {
		return (this.constructor._name || 'Item') + (this._name
				? " '" + this._name + "'"
				: ' @' + this._id);
	},

	statics: {
		drawSelectedBounds: function(bounds, ctx, matrix) {
			var coords = matrix._transformCorners(bounds);
			ctx.beginPath();
			for (var i = 0; i < 8; i++)
				ctx[i == 0 ? 'moveTo' : 'lineTo'](coords[i], coords[++i]);
			ctx.closePath();
			ctx.stroke();
			for (var i = 0; i < 8; i++) {
				ctx.beginPath();
				ctx.rect(coords[i] - 2, coords[++i] - 2, 4, 4);
				ctx.fill();
			}
		},

		draw: function(item, ctx, param) {
			if (!item._visible || item._opacity == 0)
				return;

			var tempCanvas, parentCtx;
			if (item._blendMode !== 'normal'
					|| item._opacity < 1
					&& !(item._segments && (!item.getFillColor()
							|| !item.getStrokeColor()))) {
				var bounds = item.getStrokeBounds() || item.getBounds();
				if (!bounds.width || !bounds.height)
					return;

				var itemOffset = bounds.getTopLeft().floor(),
					size = bounds.getSize().ceil().add(new Size(1, 1));
				tempCanvas = CanvasProvider.getCanvas(size);

				parentCtx = ctx;

				ctx = tempCanvas.getContext('2d');
				ctx.save();

				ctx.translate(-itemOffset.x, -itemOffset.y);
			}
			var savedOffset;
			if (itemOffset) {
				savedOffset = param.offset;
				param.offset = itemOffset;
			}
			item.draw(ctx, param);
			if (itemOffset)
				param.offset = savedOffset;

			if (tempCanvas) {

				ctx.restore();

				if (item._blendMode !== 'normal') {
					var pixelOffset = itemOffset.subtract(param.offset);
					BlendMode.process(item._blendMode, ctx, parentCtx,
						item._opacity, pixelOffset);
				} else {
					parentCtx.save();
					parentCtx.globalAlpha = item._opacity;
					parentCtx.drawImage(tempCanvas,
							itemOffset.x, itemOffset.y);
					parentCtx.restore();
				}

				CanvasProvider.returnCanvas(tempCanvas);
			}
		}
	}
}, new function() {

	var sets = {
		down: {}, drag: {}, up: {}, move: {}
	};

	function removeAll(set) {
		for (var id in set) {
			var item = set[id];
			item.remove();
			for (var type in sets) {
				var other = sets[type];
				if (other != set && other[item.getId()])
					delete other[item.getId()];
			}
		}
	}

	function installHandler(name) {
		var handler = 'onMouse' + Base.capitalize(name);
		var func = paper.tool[handler];
		if (!func || !func._installed) {
			var hash = {};
			hash[handler] = function(event) {
				if (name === 'up')
					sets.drag = {};
				removeAll(sets[name]);
				sets[name] = {};
				if (this.base)
					this.base(event);
			};
			paper.tool.inject(hash);
			paper.tool[handler]._installed = true;
		}
	}

	return Base.each(['down', 'drag', 'up', 'move'], function(name) {
		this['removeOn' + Base.capitalize(name)] = function() {
			var hash = {};
			hash[name] = true;
			return this.removeOn(hash);
		};
	}, {
		removeOn: function(obj) {
			for (var name in obj) {
				if (obj[name]) {
					sets[name][this.getId()] = this;
					if (name === 'drag')
						installHandler('up');
					installHandler(name);
				}
			}
			return this;
		}
	});
});

var Group = this.Group = Item.extend({
	initialize: function(items) {
		this.base();
		this._children = [];
		this._namedChildren = {};
		this.addChildren(!items || !Array.isArray(items)
				|| typeof items[0] !== 'object' ? arguments : items);
	},

	_changed: function(flags) {
		Item.prototype._changed.call(this, flags);
		if (flags & (ChangeFlag.HIERARCHY | ChangeFlag.CLIPPING)) {
			delete this._clipItem;
		}
	},

	_getClipItem: function() {
		if (this._clipItem !== undefined)
			return this._clipItem;
		for (var i = 0, l = this._children.length; i < l; i++) {
			var child = this._children[i];
			if (child._clipMask)
				return this._clipItem = child;
		}
		return this._clipItem = null;
	},

	isClipped: function() {
		return !!this._getClipItem();
	},

	setClipped: function(clipped) {
		var child = this.getFirstChild();
		if (child)
			child.setClipMask(clipped);
		return this;
	},

	draw: function(ctx, param) {
		var clipItem = this._getClipItem();
		if (clipItem)
			Item.draw(clipItem, ctx, param);
		for (var i = 0, l = this._children.length; i < l; i++) {
			var item = this._children[i];
			if (item != clipItem)
				Item.draw(item, ctx, param);
		}
	}
});

var Layer = this.Layer = Group.extend({
	initialize: function(items) {
		this._project = paper.project;
		this._index = this._project.layers.push(this) - 1;
		this.base.apply(this, arguments);
		this.activate();
	},

	_remove: function(deselect, notify) {
		if (this._parent)
			return this.base(deselect, notify);
		if (this._index != null) {
			if (deselect)
				this.setSelected(false);
			Base.splice(this._project.layers, null, this._index, 1);
			this._project._needsRedraw();
			return true;
		}
		return false;
	},

	getNextSibling: function() {
		return this._parent ? this.base()
				: this._project.layers[this._index + 1] || null;
	},

	getPreviousSibling: function() {
		return this._parent ? this.base()
				: this._project.layers[this._index - 1] || null;
	},

	activate: function() {
		this._project.activeLayer = this;
	}
}, new function () {
	function insert(above) {
		return function(item) {
			if (item instanceof Layer && !item._parent
						&& this._remove(false, true)) {
				Base.splice(item._project.layers, [this],
						item._index + (above ? 1 : -1), 0);
				this._setProject(item._project);
				return true;
			}
			return this.base(item);
		};
	}

	return {
		insertAbove: insert(true),

		insertBelow: insert(false)
	};
});

var PlacedItem = this.PlacedItem = Item.extend({

	_transform: function(matrix, flags) {
		this._matrix.preConcatenate(matrix);
	},

	_changed: function(flags) {
		Item.prototype._changed.call(this, flags);
		if (flags & ChangeFlag.GEOMETRY) {
			delete this._strokeBounds;
			delete this._handleBounds;
			delete this._roughBounds;
		}
	},

	getMatrix: function() {
		return this._matrix;
	},

	setMatrix: function(matrix) {
		this._matrix = matrix.clone();
		this._changed(Change.GEOMETRY);
	},

	getBounds: function() {
		var useCache = arguments[0] === undefined;
		if (useCache && this._bounds)
			return this._bounds;
		var bounds = this.getStrokeBounds(arguments[0]);
		if (useCache)
			bounds = this._bounds = this._createBounds(bounds);
		return bounds;
	},

	_getBounds: function(getter, cacheName, args) {
		var matrix = args[0],
			useCache = matrix === undefined;
		if (useCache && this[cacheName])
			return this[cacheName];
		matrix = matrix ? matrix.clone().concatenate(this._matrix)
				: this._matrix;
		var bounds = this._calculateBounds(getter, matrix);
		if (useCache)
			this[cacheName] = bounds;
		return bounds;
	}
});

var Raster = this.Raster = PlacedItem.extend({
	initialize: function(object) {
		this.base();
		if (object.getContext) {
			this.setCanvas(object);
		} else {
			if (typeof object === 'string')
				object = document.getElementById(object);
			this.setImage(object);
		}
		this._matrix = new Matrix();
	},

	clone: function() {
		var image = this._image;
		if (!image) {
			image = CanvasProvider.getCanvas(this._size);
			image.getContext('2d').drawImage(this._canvas, 0, 0);
		}
		var copy = new Raster(image);
		copy._matrix = this._matrix.clone();
		return this._clone(copy);
	},

	getSize: function() {
		return this._size;
	},

	setSize: function() {
		var size = Size.read(arguments),
			image = this.getImage();
		this.setCanvas(CanvasProvider.getCanvas(size));
		this.getContext(true).drawImage(image, 0, 0, size.width, size.height);
	},

	getWidth: function() {
		return this._size.width;
	},

	getHeight: function() {
		return this._size.height;
	},

	getPpi: function() {
		var matrix = this._matrix,
			orig = new Point(0, 0).transform(matrix),
			u = new Point(1, 0).transform(matrix).subtract(orig),
			v = new Point(0, 1).transform(matrix).subtract(orig);
		return new Size(
			72 / u.getLength(),
			72 / v.getLength()
		);
	},

	getContext: function() {
		if (!this._context)
			this._context = this.getCanvas().getContext('2d');
		if (arguments[0])
			this._changed(Change.PIXELS);
		return this._context;
	},

	setContext: function(context) {
		this._context = context;
	},

	getCanvas: function() {
		if (!this._canvas) {
			this._canvas = CanvasProvider.getCanvas(this._size);
			if (this._image)
				this.getContext(true).drawImage(this._image, 0, 0);
		}
		return this._canvas;
	},

	setCanvas: function(canvas) {
		if (this._canvas)
			CanvasProvider.returnCanvas(this._canvas);
		this._canvas = canvas;
		this._size = new Size(canvas.width, canvas.height);
		this._image = null;
		this._context = null;
		this._changed(Change.GEOMETRY);
	},

	getImage: function() {
		return this._image || this.getCanvas();
	},

	setImage: function(image) {
		if (this._canvas)
			CanvasProvider.returnCanvas(this._canvas);
		this._image = image;
		this._size = new Size(image.naturalWidth, image.naturalHeight);
		this._canvas = null;
		this._context = null;
		this._changed(Change.GEOMETRY);
	},

	getSubImage: function(rect) {
		rect = Rectangle.read(arguments);
		var canvas = CanvasProvider.getCanvas(rect.getSize());
		canvas.getContext('2d').drawImage(this.getCanvas(), rect.x, rect.y,
				canvas.width, canvas.height, 0, 0, canvas.width, canvas.height);
		return canvas;
	},

	drawImage: function(image, point) {
		point = Point.read(arguments, 1);
		this.getContext(true).drawImage(image, point.x, point.y);
	},

	getAverageColor: function(object) {
		if (!object)
			object = this.getBounds();
		var bounds, path;
		if (object instanceof PathItem) {
			path = object;
			bounds = object.getBounds();
		} else if (object.width) {
			bounds = new Rectangle(object);
		} else if (object.x) {
			bounds = Rectangle.create(object.x - 0.5, object.y - 0.5, 1, 1);
		}
		var sampleSize = 32,
			width = Math.min(bounds.width, sampleSize),
			height = Math.min(bounds.height, sampleSize);
		var ctx = Raster._sampleContext;
		if (!ctx) {
			ctx = Raster._sampleContext = CanvasProvider.getCanvas(
					new Size(sampleSize)).getContext('2d');
		} else {
			ctx.clearRect(0, 0, sampleSize, sampleSize);
		}
		ctx.save();
		ctx.scale(width / bounds.width, height / bounds.height);
		ctx.translate(-bounds.x, -bounds.y);
		if (path)
			path.draw(ctx, { clip: true });
		this._matrix.applyToContext(ctx);
		ctx.drawImage(this._canvas || this._image,
				-this._size.width / 2, -this._size.height / 2);
		ctx.restore();
		var pixels = ctx.getImageData(0.5, 0.5, Math.ceil(width),
				Math.ceil(height)).data,
			channels = [0, 0, 0],
			total = 0;
		for (var i = 0, l = pixels.length; i < l; i += 4) {
			var alpha = pixels[i + 3];
			total += alpha;
			alpha /= 255;
			channels[0] += pixels[i] * alpha;
			channels[1] += pixels[i + 1] * alpha;
			channels[2] += pixels[i + 2] * alpha;
		}
		for (var i = 0; i < 3; i++)
			channels[i] /= total;
		return total ? Color.read(channels) : null;
	},

	getPixel: function(point) {
		point = Point.read(arguments);
		var pixels = this.getContext().getImageData(point.x, point.y, 1, 1).data,
			channels = new Array(4);
		for (var i = 0; i < 4; i++)
			channels[i] = pixels[i] / 255;
		return RGBColor.read(channels);
	},

	setPixel: function(point, color) {
		var hasPoint = arguments.length == 2;
		point = Point.read(arguments, 0, hasPoint ? 1 : 2);
		color = Color.read(arguments, hasPoint ? 1 : 2);
		var ctx = this.getContext(true),
			imageData = ctx.createImageData(1, 1),
			alpha = color.getAlpha();
		imageData.data[0] = color.getRed() * 255;
		imageData.data[1] = color.getGreen() * 255;
		imageData.data[2] = color.getBlue() * 255;
		imageData.data[3] = alpha != null ? alpha * 255 : 255;
		ctx.putImageData(imageData, point.x, point.y);
	},

	createData: function(size) {
		size = Size.read(arguments);
		return this.getContext().createImageData(size.width, size.height);
	},

	getData: function(rect) {
		rect = Rectangle.read(arguments);
		if (rect.isEmpty())
			rect = new Rectangle(this.getSize());
		return this.getContext().getImageData(rect.x, rect.y,
				rect.width, rect.height);
	},

	setData: function(data, point) {
		point = Point.read(arguments, 1);
		this.getContext(true).putImageData(data, point.x, point.y);
	},

	_calculateBounds: function(getter, matrix) {
		return matrix._transformBounds(
				new Rectangle(this._size).setCenter(0, 0));
	},

	getHandleBounds: function() {
		return this.getStrokeBounds(arguments[0]);
	},

	getRoughBounds: function() {
		return this.getStrokeBounds(arguments[0]);
	},

	draw: function(ctx, param) {
		if (param.selection) {
			var bounds = new Rectangle(this._size).setCenter(0, 0);
			Item.drawSelectedBounds(bounds, ctx, this._matrix);
		} else {
			ctx.save();
			this._matrix.applyToContext(ctx);
			ctx.drawImage(this._canvas || this._image,
					-this._size.width / 2, -this._size.height / 2);
			ctx.restore();
		}
	}
});

var PlacedSymbol = this.PlacedSymbol = PlacedItem.extend({
	initialize: function(symbol, matrixOrOffset) {
		this.base();
		this.setSymbol(symbol instanceof Symbol ? symbol : new Symbol(symbol));
		this._matrix = matrixOrOffset !== undefined
			? matrixOrOffset instanceof Matrix
				? matrixOrOffset
				: new Matrix().translate(Point.read(arguments, 1))
			: new Matrix();
	},

	getSymbol: function() {
		return this._symbol;
	},

	setSymbol: function(symbol) {
		if (this._symbol)
			delete this._symbol._instances[this._id];
		this._symbol = symbol;
		symbol._instances[this._id] = this;
	},

	clone: function() {
		return this._clone(new PlacedSymbol(this.symbol, this._matrix.clone()));
	},

	_calculateBounds: function(getter, matrix) {
		return this.symbol._definition[getter](matrix);
	},

	draw: function(ctx, param) {
		if (param.selection) {
			Item.drawSelectedBounds(this.symbol._definition.getStrokeBounds(),
					ctx, this._matrix);
		} else {
			ctx.save();
			this._matrix.applyToContext(ctx);
			Item.draw(this.symbol.getDefinition(), ctx, param);
			ctx.restore();
		}
	}

});

HitResult = Base.extend({
	initialize: function(type, item, values) {
		this.type = type;
		this.item = item;
		if (values) {
			Base.each(values, function(value, key) {
				this[key] = value;
			}, this);
		}
	},

	statics: {
		getOptions: function(point, options) {
			return options && options._merged ? options : Base.merge({
				point: Point.read(arguments, 0, 1),
				type: null,
				tolerance: 2,
				fill: !options,
				stroke: !options,
				segments: !options,
				handles: false,
				ends: false,
				center: false,
				bounds: false,
				guides: false,
				selected: false,
				_merged: true
			}, options);
		}
	}
});

var Segment = this.Segment = Base.extend({
	initialize: function(arg0, arg1, arg2, arg3, arg4, arg5) {
		var count = arguments.length,
			createPoint = SegmentPoint.create,
			point, handleIn, handleOut;
		if (count == 0) {
		} else if (count == 1) {
			if (arg0.point) {
				point = arg0.point;
				handleIn = arg0.handleIn;
				handleOut = arg0.handleOut;
			} else {
				point = arg0;
			}
		} else if (count < 6) {
			if (count == 2 && arg1.x === undefined) {
				point = [ arg0, arg1 ];
			} else {
				point = arg0;
				handleIn = arg1;
				handleOut = arg2;
			}
		} else if (count == 6) {
			point = [ arg0, arg1 ];
			handleIn = [ arg2, arg3 ];
			handleOut = [ arg4, arg5 ];
		}
		createPoint(this, '_point', point);
		createPoint(this, '_handleIn', handleIn);
		createPoint(this, '_handleOut', handleOut);
	},

	_changed: function(point) {
		if (!this._path)
			return;
		var curve = this._path._curves && this.getCurve(), other;
		if (curve) {
			curve._changed();
			if (other = (curve[point == this._point
					|| point == this._handleIn && curve._segment1 == this
					? 'getPrevious' : 'getNext']())) {
				other._changed();
			}
		}
		this._path._changed(Change.GEOMETRY);
	},

	getPoint: function() {
		return this._point;
	},

	setPoint: function(point) {
		point = Point.read(arguments);
		this._point.set(point.x, point.y);
	},

	getHandleIn: function() {
		return this._handleIn;
	},

	setHandleIn: function(point) {
		point = Point.read(arguments);
		this._handleIn.set(point.x, point.y);
	},

	getHandleOut: function() {
		return this._handleOut;
	},

	setHandleOut: function(point) {
		point = Point.read(arguments);
		this._handleOut.set(point.x, point.y);
	},

	_isSelected: function(point) {
		var state = this._selectionState;
		return point == this._point ? !!(state & SelectionState.POINT)
			: point == this._handleIn ? !!(state & SelectionState.HANDLE_IN)
			: point == this._handleOut ? !!(state & SelectionState.HANDLE_OUT)
			: false;
	},

	_setSelected: function(point, selected) {
		var path = this._path,
			selected = !!selected, 
			state = this._selectionState || 0,
			selection = [
				!!(state & SelectionState.POINT),
				!!(state & SelectionState.HANDLE_IN),
				!!(state & SelectionState.HANDLE_OUT)
			];
		if (point == this._point) {
			if (selected) {
				selection[1] = selection[2] = false;
			} else {
				var previous = this.getPrevious(),
					next = this.getNext();
				selection[1] = previous && (previous._point.isSelected()
						|| previous._handleOut.isSelected());
				selection[2] = next && (next._point.isSelected()
						|| next._handleIn.isSelected());
			}
			selection[0] = selected;
		} else {
			var index = point == this._handleIn ? 1 : 2;
			if (selection[index] != selected) {
				if (selected)
					selection[0] = false;
				selection[index] = selected;
				path._changed(Change.ATTRIBUTE);
			}
		}
		this._selectionState = (selection[0] ? SelectionState.POINT : 0)
				| (selection[1] ? SelectionState.HANDLE_IN : 0)
				| (selection[2] ? SelectionState.HANDLE_OUT : 0);
		if (path && state != this._selectionState)
			path._updateSelection(this, state, this._selectionState);
	},

	isSelected: function() {
		return this._isSelected(this._point);
	},

	setSelected: function(selected) {
		this._setSelected(this._point, selected);
	},

	getIndex: function() {
		return this._index !== undefined ? this._index : null;
	},

	getPath: function() {
		return this._path || null;
	},

	getCurve: function() {
		if (this._path) {
			var index = this._index;
			if (!this._path._closed && index == this._path._segments.length - 1)
				index--;
			return this._path.getCurves()[index] || null;
		}
		return null;
	},

	getNext: function() {
		var segments = this._path && this._path._segments;
		return segments && (segments[this._index + 1]
				|| this._path._closed && segments[0]) || null;
	},

	getPrevious: function() {
		var segments = this._path && this._path._segments;
		return segments && (segments[this._index - 1]
				|| this._path._closed && segments[segments.length - 1]) || null;
	},

	reverse: function() {
		return new Segment(this._point, this._handleOut, this._handleIn);
	},

	remove: function() {
		return this._path ? !!this._path.removeSegment(this._index) : false;
	},

	toString: function() {
		var parts = [ 'point: ' + this._point ];
		if (!this._handleIn.isZero())
			parts.push('handleIn: ' + this._handleIn);
		if (!this._handleOut.isZero())
			parts.push('handleOut: ' + this._handleOut);
		return '{ ' + parts.join(', ') + ' }';
	},

	_transformCoordinates: function(matrix, coords, change) {
		var point = this._point,
			handleIn =  !change || !this._handleIn.isZero()
					? this._handleIn : null,
			handleOut = !change || !this._handleOut.isZero()
					? this._handleOut : null,
			x = point._x,
			y = point._y,
			i = 2;
		coords[0] = x;
		coords[1] = y;
		if (handleIn) {
			coords[i++] = handleIn._x + x;
			coords[i++] = handleIn._y + y;
		}
		if (handleOut) {
			coords[i++] = handleOut._x + x;
			coords[i++] = handleOut._y + y;
		}
		if (!matrix)
			return;
		matrix._transformCoordinates(coords, 0, coords, 0, i / 2);
		x = coords[0];
		y = coords[1];
		if (change) {
			point._x = x;
			point._y = y;
			i  = 2;
			if (handleIn) {
				handleIn._x = coords[i++] - x;
				handleIn._y = coords[i++] - y;
			}
			if (handleOut) {
				handleOut._x = coords[i++] - x;
				handleOut._y = coords[i++] - y;
			}
		} else {
			if (!handleIn) {
				coords[i++] = x;
				coords[i++] = y;
			}
			if (!handleOut) {
				coords[i++] = x;
				coords[i++] = y;
			}
		}
	}
});

var SegmentPoint = Point.extend({
	set: function(x, y) {
		this._x = x;
		this._y = y;
		this._owner._changed(this);
		return this;
	},

	getX: function() {
		return this._x;
	},

	setX: function(x) {
		this._x = x;
		this._owner._changed(this);
	},

	getY: function() {
		return this._y;
	},

	setY: function(y) {
		this._y = y;
		this._owner._changed(this);
	},

	isZero: function() {
		return this._x == 0 && this._y == 0;
	},

	setSelected: function(selected) {
		this._owner._setSelected(this, selected);
	},

	isSelected: function() {
		return this._owner._isSelected(this);
	},

	statics: {
		create: function(segment, key, pt) {
			var point = new SegmentPoint(SegmentPoint.dont),
				x, y, selected;
			if (!pt) {
				x = y = 0;
			} else if ((x = pt[0]) !== undefined) { 
				y = pt[1];
			} else {
				if ((x = pt.x) === undefined) {
					pt = Point.read(arguments, 2, 1);
					x = pt.x;
				}
				y = pt.y;
				selected = pt.selected;
			}
			point._x = x;
			point._y = y;
			point._owner = segment;
			segment[key] = point;
			if (selected)
				point.setSelected(true);
			return point;
		}
	}
});

var SelectionState = {
	HANDLE_IN: 1,
	HANDLE_OUT: 2,
	POINT: 4
};

var Curve = this.Curve = Base.extend({
	initialize: function(arg0, arg1, arg2, arg3, arg4, arg5, arg6, arg7) {
		var count = arguments.length;
		if (count == 0) {
			this._segment1 = new Segment();
			this._segment2 = new Segment();
		} else if (count == 1) {
			this._segment1 = new Segment(arg0.segment1);
			this._segment2 = new Segment(arg0.segment2);
		} else if (count == 2) {
			this._segment1 = new Segment(arg0);
			this._segment2 = new Segment(arg1);
		} else if (count == 4) {
			this._segment1 = new Segment(arg0, null, arg1);
			this._segment2 = new Segment(arg3, arg2, null);
		} else if (count == 8) {
			var p1 = Point.create(arg0, arg1),
				p2 = Point.create(arg6, arg7);
			this._segment1 = new Segment(p1, null,
					Point.create(arg2, arg3).subtract(p1));
			this._segment2 = new Segment(p2,
					Point.create(arg4, arg5).subtract(p2), null);
		}
	},

	_changed: function() {
		delete this._length;
	},

	getPoint1: function() {
		return this._segment1._point;
	},

	setPoint1: function(point) {
		point = Point.read(arguments);
		this._segment1._point.set(point.x, point.y);
	},

	getPoint2: function() {
		return this._segment2._point;
	},

	setPoint2: function(point) {
		point = Point.read(arguments);
		this._segment2._point.set(point.x, point.y);
	},

	getHandle1: function() {
		return this._segment1._handleOut;
	},

	setHandle1: function(point) {
		point = Point.read(arguments);
		this._segment1._handleOut.set(point.x, point.y);
	},

	getHandle2: function() {
		return this._segment2._handleIn;
	},

	setHandle2: function(point) {
		point = Point.read(arguments);
		this._segment2._handleIn.set(point.x, point.y);
	},

	getSegment1: function() {
		return this._segment1;
	},

	getSegment2: function() {
		return this._segment2;
	},

	getPath: function() {
		return this._path;
	},

	getIndex: function() {
		return this._segment1._index;
	},

	getNext: function() {
		var curves = this._path && this._path._curves;
		return curves && (curves[this._segment1._index + 1]
				|| this._path._closed && curves[0]) || null;
	},

	getPrevious: function() {
		var curves = this._path && this._path._curves;
		return curves && (curves[this._segment1._index - 1]
				|| this._path._closed && curves[curves.length - 1]) || null;
	},

	isSelected: function() {
		return this.getHandle1().isSelected() && this.getHandle2().isSelected();
	},

	setSelected: function(selected) {
		this.getHandle1().setSelected(selected);
		this.getHandle2().setSelected(selected);
	},

	getValues: function(matrix) {
		return Curve.getValues(this._segment1, this._segment2, matrix);
	},

	getPoints: function(matrix) {
		var coords = this.getValues(matrix),
			points = [];
		for (var i = 0; i < 8; i += 2)
			points.push(Point.create(coords[i], coords[i + 1]));
		return points;
	},

	getLength: function() {
		var from = arguments[0],
			to = arguments[1];
			fullLength = arguments.length == 0 || from == 0 && to == 1;
		if (fullLength && this._length != null)
			return this._length;
		var length = Curve.getLength(this.getValues(), from, to);
		if (fullLength)
			this._length = length;
		return length;
	},

	getPart: function(from, to) {
		return new Curve(Curve.getPart(this.getValues(), from, to));
	},

	isLinear: function() {
		return this._segment1._handleOut.isZero()
				&& this._segment2._handleIn.isZero();
	},

	getParameterAt: function(offset, start) {
		return Curve.getParameterAt(this.getValues(), offset,
				start !== undefined ? start : offset < 0 ? 1 : 0);
	},

	getPoint: function(parameter) {
		return Curve.evaluate(this.getValues(), parameter, 0);
	},

	getTangent: function(parameter) {
		return Curve.evaluate(this.getValues(), parameter, 1);
	},

	getNormal: function(parameter) {
		return Curve.evaluate(this.getValues(), parameter, 2);
	},

	getParameter: function(point) {
		point = Point.read(point);
		return Curve.getParameter(this.getValues(), point.x, point.y);
	},

	getCrossings: function(point, matrix, roots) {
		var vals = this.getValues(matrix),
			num = Curve.solveCubic(vals, 1, point.y, roots),
			crossings = 0;
		for (var i = 0; i < num; i++) {
			var t = roots[i];
			if (t >= 0 && t < 1 && Curve.evaluate(vals, t, 0).x > point.x) {
				if (t < Numerical.TOLERANCE && Curve.evaluate(
							this.getPrevious().getValues(matrix), 1, 1).y
						* Curve.evaluate(vals, t, 1).y >= 0)
					continue;
				crossings++;
			}
		}
		return crossings;
	},

	reverse: function() {
		return new Curve(this._segment2.reverse(), this._segment1.reverse());
	},

	clone: function() {
		return new Curve(this._segment1, this._segment2);
	},

	toString: function() {
		var parts = [ 'point1: ' + this._segment1._point ];
		if (!this._segment1._handleOut.isZero())
			parts.push('handle1: ' + this._segment1._handleOut);
		if (!this._segment2._handleIn.isZero())
			parts.push('handle2: ' + this._segment2._handleIn);
		parts.push('point2: ' + this._segment2._point);
		return '{ ' + parts.join(', ') + ' }';
	},

	statics: {
		create: function(path, segment1, segment2) {
			var curve = new Curve(Curve.dont);
			curve._path = path;
			curve._segment1 = segment1;
			curve._segment2 = segment2;
			return curve;
		},

		getValues: function(segment1, segment2, matrix) {
			var p1 = segment1._point,
				h1 = segment1._handleOut,
				h2 = segment2._handleIn,
				p2 = segment2._point,
				coords = [
					p1._x, p1._y,
					p1._x + h1._x, p1._y + h1._y,
					p2._x + h2._x, p2._y + h2._y,
					p2._x, p2._y
				];
			return matrix
					? matrix._transformCoordinates(coords, 0, coords, 0, 4)
					: coords;
		},

		evaluate: function(v, t, type) {
			var p1x = v[0], p1y = v[1],
				c1x = v[2], c1y = v[3],
				c2x = v[4], c2y = v[5],
				p2x = v[6], p2y = v[7],
				x, y;

			if (type == 0 && (t == 0 || t == 1)) {
				x = t == 0 ? p1x : p2x;
				y = t == 0 ? p1y : p2y;
			} else {
				var tMin = Numerical.TOLERANCE;
				if (t < tMin && c1x == p1x && c1y == p1y)
					t = tMin;
				else if (t > 1 - tMin && c2x == p2x && c2y == p2y)
					t = 1 - tMin;
				var cx = 3 * (c1x - p1x),
					bx = 3 * (c2x - c1x) - cx,
					ax = p2x - p1x - cx - bx,

					cy = 3 * (c1y - p1y),
					by = 3 * (c2y - c1y) - cy,
					ay = p2y - p1y - cy - by;

				switch (type) {
				case 0: 
					x = ((ax * t + bx) * t + cx) * t + p1x;
					y = ((ay * t + by) * t + cy) * t + p1y;
					break;
				case 1: 
				case 2: 
					x = (3 * ax * t + 2 * bx) * t + cx;
					y = (3 * ay * t + 2 * by) * t + cy;
					break;
				}
			}
			return type == 2 ? new Point(y, -x) : new Point(x, y);
		},

		subdivide: function(v, t) {
			var p1x = v[0], p1y = v[1],
				c1x = v[2], c1y = v[3],
				c2x = v[4], c2y = v[5],
				p2x = v[6], p2y = v[7];
			if (t === undefined)
				t = 0.5;
			var u = 1 - t,
				p3x = u * p1x + t * c1x, p3y = u * p1y + t * c1y,
				p4x = u * c1x + t * c2x, p4y = u * c1y + t * c2y,
				p5x = u * c2x + t * p2x, p5y = u * c2y + t * p2y,
				p6x = u * p3x + t * p4x, p6y = u * p3y + t * p4y,
				p7x = u * p4x + t * p5x, p7y = u * p4y + t * p5y,
				p8x = u * p6x + t * p7x, p8y = u * p6y + t * p7y;
			return [
				[p1x, p1y, p3x, p3y, p6x, p6y, p8x, p8y], 
				[p8x, p8y, p7x, p7y, p5x, p5y, p2x, p2y] 
			];
		},

		solveCubic: function (v, coord, val, roots) {
			var p1 = v[coord],
				c1 = v[coord + 2],
				c2 = v[coord + 4],
				p2 = v[coord + 6],
				c = 3 * (c1 - p1),
				b = 3 * (c2 - c1) - c,
				a = p2 - p1 - c - b;
			return Numerical.solveCubic(a, b, c, p1 - val, roots,
					Numerical.TOLERANCE);
		},

		getParameter: function(v, x, y) {
			var txs = [],
				tys = [],
				sx = Curve.solveCubic(v, 0, x, txs),
				sy = Curve.solveCubic(v, 1, y, tys),
				tx, ty;
			for (var cx = 0;  sx == -1 || cx < sx;) {
				if (sx == -1 || (tx = txs[cx++]) >= 0 && tx <= 1) {
					for (var cy = 0; sy == -1 || cy < sy;) {
						if (sy == -1 || (ty = tys[cy++]) >= 0 && ty <= 1) {
							if (sx == -1) tx = ty;
							else if (sy == -1) ty = tx;
							if (Math.abs(tx - ty) < Numerical.TOLERANCE)
								return (tx + ty) * 0.5;
						}
					}
					if (sx == -1)
						break;
				}
			}
			return null;
		},

		getPart: function(v, from, to) {
			if (from > 0)
				v = Curve.subdivide(v, from)[1]; 
			if (to < 1)
				v = Curve.subdivide(v, (to - from) / (1 - from))[0]; 
			return v;
		},

		isFlatEnough: function(v) {
			var p1x = v[0], p1y = v[1],
				c1x = v[2], c1y = v[3],
				c2x = v[4], c2y = v[5],
				p2x = v[6], p2y = v[7],

				a = p1y - p2y,
				b = p2x - p1x,
				c = p1x * p2y - p2x * p1y,
				v1 = a * c1x + b * c1y + c,
				v2 = a * c2x + b * c2y + c;
			return Math.abs((v1 * v1 + v2 * v2) / (a * (a * a + b * b))) < 0.005;
		}
	}
}, new function() { 

	function getLengthIntegrand(v) {
		var p1x = v[0], p1y = v[1],
			c1x = v[2], c1y = v[3],
			c2x = v[4], c2y = v[5],
			p2x = v[6], p2y = v[7],

			ax = 9 * (c1x - c2x) + 3 * (p2x - p1x),
			bx = 6 * (p1x + c2x) - 12 * c1x,
			cx = 3 * (c1x - p1x),

			ay = 9 * (c1y - c2y) + 3 * (p2y - p1y),
			by = 6 * (p1y + c2y) - 12 * c1y,
			cy = 3 * (c1y - p1y);

		return function(t) {
			var dx = (ax * t + bx) * t + cx,
				dy = (ay * t + by) * t + cy;
			return Math.sqrt(dx * dx + dy * dy);
		};
	}

	function getIterations(a, b) {
		return Math.max(2, Math.min(16, Math.ceil(Math.abs(b - a) * 32)));
	}

	return {
		statics: true,

		getLength: function(v, a, b) {
			if (a === undefined)
				a = 0;
			if (b === undefined)
				b = 1;
			if (v[0] == v[2] && v[1] == v[3] && v[6] == v[4] && v[7] == v[5]) {
				var dx = v[6] - v[0], 
					dy = v[7] - v[1]; 
				return (b - a) * Math.sqrt(dx * dx + dy * dy);
			}
			var ds = getLengthIntegrand(v);
			return Numerical.integrate(ds, a, b, getIterations(a, b));
		},

		getParameterAt: function(v, offset, start) {
			if (offset == 0)
				return start;
			var forward = offset > 0,
				a = forward ? start : 0,
				b = forward ? 1 : start,
				offset = Math.abs(offset),
				ds = getLengthIntegrand(v),
				rangeLength = Numerical.integrate(ds, a, b,
						getIterations(a, b));
			if (offset >= rangeLength)
				return forward ? b : a;
			var guess = offset / rangeLength,
				length = 0;
			function f(t) {
				var count = getIterations(start, t);
				length += start < t
						? Numerical.integrate(ds, start, t, count)
						: -Numerical.integrate(ds, t, start, count);
				start = t;
				return length - offset;
			}
			return Numerical.findRoot(f, ds,
					forward ? a + guess : b - guess, 
					a, b, 16, Numerical.TOLERANCE);
		}
	};
}, new function() { 

	var maxDepth = 32,
		epsilon = Math.pow(2, -maxDepth - 1);

	var zCubic = [
		[1.0, 0.6, 0.3, 0.1],
		[0.4, 0.6, 0.6, 0.4],
		[0.1, 0.3, 0.6, 1.0]
	];

	var xAxis = new Line(new Point(0, 0), new Point(1, 0));

	function toBezierForm(v, point) {
		var n = 3, 
	 		degree = 5, 
			c = [],
			d = [],
			cd = [],
			w = [];
		for(var i = 0; i <= n; i++) {
			c[i] = v[i].subtract(point);
			if (i < n)
				d[i] = v[i + 1].subtract(v[i]).multiply(n);
		}

		for (var row = 0; row < n; row++) {
			cd[row] = [];
			for (var column = 0; column <= n; column++)
				cd[row][column] = d[row].dot(c[column]);
		}

		for (var i = 0; i <= degree; i++)
			w[i] = new Point(i / degree, 0);

		for (k = 0; k <= degree; k++) {
			var lb = Math.max(0, k - n + 1),
				ub = Math.min(k, n);
			for (var i = lb; i <= ub; i++) {
				var j = k - i;
				w[k].y += cd[j][i] * zCubic[j][i];
			}
		}

		return w;
	}

	function findRoots(w, depth) {
		switch (countCrossings(w)) {
		case 0:
			return [];
		case 1:
			if (depth >= maxDepth)
				return [0.5 * (w[0].x + w[5].x)];
			if (isFlatEnough(w)) {
				var line = new Line(w[0], w[5], true);
				return [ line.vector.getLength(true) < Numerical.EPSILON
						? line.point.x
						: xAxis.intersect(line).x ];
			}
		}

		var p = [[]],
			left = [],
			right = [];
		for (var j = 0; j <= 5; j++)
		 	p[0][j] = new Point(w[j]);

		for (var i = 1; i <= 5; i++) {
			p[i] = [];
			for (var j = 0 ; j <= 5 - i; j++)
				p[i][j] = p[i - 1][j].add(p[i - 1][j + 1]).multiply(0.5);
		}
		for (var j = 0; j <= 5; j++) {
			left[j]  = p[j][0];
			right[j] = p[5 - j][j];
		}

		return findRoots(left, depth + 1).concat(findRoots(right, depth + 1));
	}

	function countCrossings(v) {
		var crossings = 0,
			prevSign = null;
		for (var i = 0, l = v.length; i < l; i++)  {
			var sign = v[i].y < 0 ? -1 : 1;
			if (prevSign != null && sign != prevSign)
				crossings++;
			prevSign = sign;
		}
		return crossings;
	}

	function isFlatEnough(v) {

		var n = v.length - 1,
			a = v[0].y - v[n].y,
			b = v[n].x - v[0].x,
			c = v[0].x * v[n].y - v[n].x * v[0].y,
			maxAbove = 0,
			maxBelow = 0;
		for (var i = 1; i < n; i++) {
			var val = a * v[i].x + b * v[i].y + c,
				dist = val * val;
			if (val < 0 && dist > maxBelow) {
				maxBelow = dist;
			} else if (dist > maxAbove) {
				maxAbove = dist;
			}
		}
		return Math.abs((maxAbove + maxBelow) / (2 * a * (a * a + b * b)))
				< epsilon;
	}

	return {
		getNearestLocation: function(point, matrix) {
			var w = toBezierForm(this.getPoints(matrix), point);
			var roots = findRoots(w, 0).concat([0, 1]);
			var minDist = Infinity,
				minT,
				minPoint;
			for (var i = 0; i < roots.length; i++) {
				var pt = this.getPoint(roots[i]),
					dist = point.getDistance(pt, true);
				if (dist < minDist) {
					minDist = dist;
					minT = roots[i];
					minPoint = pt;
				}
			}
			return new CurveLocation(this, minT, minPoint, Math.sqrt(minDist));
		},

		getNearestPoint: function(point, matrix) {
			return this.getNearestLocation(point, matrix).getPoint();
		}
	};
});

CurveLocation = Base.extend({
	initialize: function(curve, parameter, point, distance) {
		this._curve = curve;
		this._parameter = parameter;
		this._point = point;
		this._distance = distance;
	},

	getSegment: function() {
		if (!this._segment) {
			var curve = this._curve,
				parameter = this.getParameter();
			if (parameter == 0) {
				this._segment = curve._segment1;
			} else if (parameter == 1) {
				this._segment = curve._segment2;
			} else if (parameter == null) {
				return null;
			} else {
				this._segment = curve.getLength(0, parameter)
					< curve.getLength(parameter, 1)
						? curve._segment1
						: curve._segment2;
			}
		}
		return this._segment;
	},

	getCurve: function() {
		return this._curve;
	},

	getPath: function() {
		return this._curve && this._curve._path;
	},

	getIndex: function() {
		return this._curve && this._curve.getIndex();
	},

	getOffset: function() {
		var path = this._curve && this._curve._path;
		return path && path._getOffset(this);
	},

	getCurveOffset: function() {
		var parameter = this.getParameter();
		return parameter != null && this._curve
				&& this._curve.getLength(0, parameter);
	},

	getParameter: function() {
		if (this._parameter == null && this._curve && this._point)
			this._parameter = this._curve.getParameterAt(this._point);
		return this._parameter;
	},

	getPoint: function() {
		if (!this._point && this._curve && this._parameter != null)
			this._point = this._curve.getPoint(this._parameter);
		return this._point;
	},

	getTangent: function() {
		var parameter = this.getParameter();
		return parameter != null && this._curve
				&& this._curve.getTangent(parameter);
	},

	getNormal: function() {
		var parameter = this.getParameter();
		return parameter != null && this._curve
				&& this._curve.getNormal(parameter);
	},

	getDistance: function() {
		return this._distance;
	},

	toString: function() {
		var parts = [],
			point = this.getPoint();
		if (point)
			parts.push('point: ' + point);
		var index = this.getIndex();
		if (index != null)
			parts.push('index: ' + index);
		var parameter = this.getParameter();
		if (parameter != null)
			parts.push('parameter: ' + Base.formatNumber(parameter));
		if (this._distance != null)
			parts.push('distance: ' + Base.formatNumber(this._distance));
		return '{ ' + parts.join(', ') + ' }';
	}
});

var PathItem = this.PathItem = Item.extend({

});

var Path = this.Path = PathItem.extend({
	initialize: function(segments) {
		this.base();
		this._closed = false;
		this._selectedSegmentState = 0;
		this.setSegments(!segments || !Array.isArray(segments)
				|| typeof segments[0] !== 'object' ? arguments : segments);
	},

	clone: function() {
		var copy = this._clone(new Path(this._segments));
		copy._closed = this._closed;
		if (this._clockwise !== undefined)
			copy._clockwise = this._clockwise;
		return copy;
	},

	_changed: function(flags) {
		Item.prototype._changed.call(this, flags);
		if (flags & ChangeFlag.GEOMETRY) {
			delete this._strokeBounds;
			delete this._handleBounds;
			delete this._roughBounds;
			delete this._length;
			delete this._clockwise;
		} else if (flags & ChangeFlag.STROKE) {
			delete this._strokeBounds;
		}
	},

	getSegments: function() {
		return this._segments;
	},

	setSegments: function(segments) {
		if (!this._segments) {
			this._segments = [];
		} else {
			this._selectedSegmentState = 0;
			this._segments.length = 0;
			if (this._curves)
				delete this._curves;
		}
		this._add(Segment.readAll(segments));
	},

	getFirstSegment: function() {
		return this._segments[0];
	},

	getLastSegment: function() {
		return this._segments[this._segments.length - 1];
	},

	getCurves: function() {
		if (!this._curves) {
			var segments = this._segments,
				length = segments.length;
			if (!this._closed && length > 0)
				length--;
			this._curves = new Array(length);
			for (var i = 0; i < length; i++)
				this._curves[i] = Curve.create(this, segments[i],
					segments[i + 1] || segments[0]);
		}
		return this._curves;
	},

	getFirstCurve: function() {
		return this.getCurves()[0];
	},

	getLastCurve: function() {
		var curves = this.getCurves();
		return curves[curves.length - 1];
	},

	getClosed: function() {
		return this._closed;
	},

	setClosed: function(closed) {
		if (this._closed != (closed = !!closed)) {
			this._closed = closed;
			if (this._curves) {
				var length = this._segments.length,
					i;
				if (!closed && length > 0)
					length--;
				this._curves.length = length;
				if (closed)
					this._curves[i = length - 1] = Curve.create(this,
						this._segments[i], this._segments[0]);
			}
			this._changed(Change.GEOMETRY);
		}
	},

	_transform: function(matrix, flags) {
		if (!matrix.isIdentity()) {
			var coords = new Array(6);
			for (var i = 0, l = this._segments.length; i < l; i++) {
				this._segments[i]._transformCoordinates(matrix, coords, true);
			}
			var fillColor = this.getFillColor(),
				strokeColor = this.getStrokeColor();
			if (fillColor && fillColor.transform)
				fillColor.transform(matrix);
			if (strokeColor && strokeColor.transform)
				strokeColor.transform(matrix);
		}
	},

	_add: function(segs, index) {
		var segments = this._segments,
			curves = this._curves,
			amount = segs.length,
			append = index == null,
			index = append ? segments.length : index,
			fullySelected = this.isFullySelected();
		for (var i = 0; i < amount; i++) {
			var segment = segs[i];
			if (segment._path) {
				segment = segs[i] = new Segment(segment);
			}
			segment._path = this;
			segment._index = index + i;
			if (fullySelected)
				segment._selectionState = SelectionState.POINT;
			if (segment._selectionState)
				this._updateSelection(segment, 0, segment._selectionState);
		}
		if (append) {
			segments.push.apply(segments, segs);
		} else {
			segments.splice.apply(segments, [index, 0].concat(segs));
			for (var i = index + amount, l = segments.length; i < l; i++) {
				segments[i]._index = i;
			}
		}
		if (curves && --index >= 0) {
			curves.splice(index, 0, Curve.create(this, segments[index],
				segments[index + 1]));
			var curve = curves[index + amount];
			if (curve) {
				curve._segment1 = segments[index + amount];
			}
		}
		this._changed(Change.GEOMETRY);
		return segs;
	},

	add: function(segment1 ) {
		return arguments.length > 1 && typeof segment1 !== 'number'
			? this._add(Segment.readAll(arguments))
			: this._add([ Segment.read(arguments) ])[0];
	},

	insert: function(index, segment1 ) {
		return arguments.length > 2 && typeof segment1 !== 'number'
			? this._add(Segment.readAll(arguments, 1), index)
			: this._add([ Segment.read(arguments, 1) ], index)[0];
	},

	addSegment: function(segment) {
		return this._add([ Segment.read(arguments) ])[0];
	},

	insertSegment: function(index, segment) {
		return this._add([ Segment.read(arguments, 1) ], index)[0];
	},

	addSegments: function(segments) {
		return this._add(Segment.readAll(segments));
	},

	insertSegments: function(index, segments) {
		return this._add(Segment.readAll(segments), index);
	},

	removeSegment: function(index) {
		var segments = this.removeSegments(index, index + 1);
		return segments[0] || null;
	},

	removeSegments: function(from, to) {
		from = from || 0;
	 	to = Base.pick(to, this._segments.length);
		var segments = this._segments,
			curves = this._curves,
			last = to >= segments.length,
			removed = segments.splice(from, to - from),
			amount = removed.length;
		if (!amount)
			return removed;
		for (var i = 0; i < amount; i++) {
			var segment = removed[i];
			if (segment._selectionState)
				this._updateSelection(segment, segment._selectionState, 0);
			removed._index = removed._path = undefined;
		}
		for (var i = from, l = segments.length; i < l; i++)
			segments[i]._index = i;
		if (curves) {
			curves.splice(from, amount);
			var curve;
			if (curve = curves[from - 1])
				curve._segment2 = segments[from];
			if (curve = curves[from])
				curve._segment1 = segments[from];
			if (last && this._closed && (curve = curves[curves.length - 1]))
				curve._segment2 = segments[0];
		}
		this._changed(Change.GEOMETRY);
		return removed;
	},

	isFullySelected: function() {
		return this._selected && this._selectedSegmentState
				== this._segments.length * SelectionState.POINT;
	},

	setFullySelected: function(selected) {
		var length = this._segments.length;
		this._selectedSegmentState = selected
				? length * SelectionState.POINT : 0;
		for (var i = 0; i < length; i++)
			this._segments[i]._selectionState = selected
					? SelectionState.POINT : 0;
		this.setSelected(selected);
	},

	_updateSelection: function(segment, oldState, newState) {
		segment._selectionState = newState;
		var total = this._selectedSegmentState += newState - oldState;
		if (total > 0)
			this.setSelected(true);
	},

	flatten: function(maxDistance) {
		var flattener = new PathFlattener(this),
			pos = 0,
			step = flattener.length / Math.ceil(flattener.length / maxDistance),
			end = flattener.length + (this._closed ? -step : step) / 2;
		var segments = [];
		while (pos <= end) {
			segments.push(new Segment(flattener.evaluate(pos, 0)));
			pos += step;
		}
		this.setSegments(segments);
	},

	simplify: function(tolerance) {
		if (this._segments.length > 2) {
			var fitter = new PathFitter(this, tolerance || 2.5);
			this.setSegments(fitter.fit());
		}
	},

	isClockwise: function() {
		if (this._clockwise !== undefined)
			return this._clockwise;
		var sum = 0,
			xPre, yPre;
		function edge(x, y) {
			if (xPre !== undefined)
				sum += (xPre - x) * (y + yPre);
			xPre = x;
			yPre = y;
		}
		for (var i = 0, l = this._segments.length; i < l; i++) {
			var seg1 = this._segments[i],
				seg2 = this._segments[i + 1 < l ? i + 1 : 0],
				point1 = seg1._point,
				handle1 = seg1._handleOut,
				handle2 = seg2._handleIn,
				point2 = seg2._point;
			edge(point1._x, point1._y);
			edge(point1._x + handle1._x, point1._y + handle1._y);
			edge(point2._x + handle2._x, point2._y + handle2._y);
			edge(point2._x, point2._y);
		}
		return sum > 0;
	},

	setClockwise: function(clockwise) {
		if (this.isClockwise() != (clockwise = !!clockwise)) {
			this.reverse();
			this._clockwise = clockwise;
		}
	},

	reverse: function() {
		this._segments.reverse();
		for (var i = 0, l = this._segments.length; i < l; i++) {
			var segment = this._segments[i];
			var handleIn = segment._handleIn;
			segment._handleIn = segment._handleOut;
			segment._handleOut = handleIn;
		}
		if (this._clockwise !== undefined)
			this._clockwise = !this._clockwise;
	},

	join: function(path) {
		if (path) {
			var segments = path._segments,
				last1 = this.getLastSegment(),
				last2 = path.getLastSegment();
			if (last1._point.equals(last2._point))
				path.reverse();
			var first2 = path.getFirstSegment();
			if (last1._point.equals(first2._point)) {
				last1.setHandleOut(first2._handleOut);
				this._add(segments.slice(1));
			} else {
				var first1 = this.getFirstSegment();
				if (first1._point.equals(first2._point))
					path.reverse();
				last2 = path.getLastSegment();
				if (first1._point.equals(last2._point)) {
					first1.setHandleIn(last2._handleIn);
					this._add(segments.slice(0, segments.length - 1), 0);
				} else {
					this._add(segments.slice(0));
				}
			}
			path.remove();
			var first1 = this.getFirstSegment();
			last1 = this.getLastSegment();
			if (last1._point.equals(first1._point)) {
				first1.setHandleIn(last1._handleIn);
				last1.remove();
				this.setClosed(true);
			}
			this._changed(Change.GEOMETRY);
			return true;
		}
		return false;
	},

	getLength: function() {
		if (this._length == null) {
			var curves = this.getCurves();
			this._length = 0;
			for (var i = 0, l = curves.length; i < l; i++)
				this._length += curves[i].getLength();
		}
		return this._length;
	},

	_getOffset: function(location) {
		var index = location && location.getIndex();
		if (index != null) {
			var curves = this.getCurves(),
				offset = 0;
			for (var i = 0; i < index; i++)
				offset += curves[i].getLength();
			var curve = curves[index];
			return offset + curve.getLength(0, location.getParameter());
		}
		return null;
	},

	getLocation: function(point) {
		var curves = this.getCurves();
		for (var i = 0, l = curves.length; i < l; i++) {
			var curve = curves[i];
			var t = curve.getParameter(point);
			if (t != null)
				return new CurveLocation(curve, t);
		}
		return null;
	},

	getLocationAt: function(offset, isParameter) {
		var curves = this.getCurves(),
			length = 0;
		if (isParameter) {
			var index = ~~offset; 
			return new CurveLocation(curves[index], offset - index);
		}
		for (var i = 0, l = curves.length; i < l; i++) {
			var start = length,
				curve = curves[i];
			length += curve.getLength();
			if (length >= offset) {
				return new CurveLocation(curve,
						curve.getParameterAt(offset - start));
			}
		}
		if (offset <= this.getLength())
			return new CurveLocation(curves[curves.length - 1], 1);
		return null;
	},

	getPointAt: function(offset, isParameter) {
		var loc = this.getLocationAt(offset, isParameter);
		return loc && loc.getPoint();
	},

	getTangentAt: function(offset, isParameter) {
		var loc = this.getLocationAt(offset, isParameter);
		return loc && loc.getTangent();
	},

	getNormalAt: function(offset, isParameter) {
		var loc = this.getLocationAt(offset, isParameter);
		return loc && loc.getNormal();
	},

	getNearestLocation: function(point, matrix) {
		var curves = this.getCurves(),
			minDist = Infinity,
			minLoc = null;
		for (var i = 0, l = curves.length; i < l; i++) {
			var loc = curves[i].getNearestLocation(point, matrix);
			if (loc._distance < minDist) {
				minDist = loc._distance;
				minLoc = loc;
			}
		}
		return minLoc;
	},

	getNearestPoint: function(point, matrix) {
		return this.getNearestLocation(point, matrix).getPoint();
	},

	contains: function(point, matrix) {
		point = Point.read(arguments);
		if (!this._closed || !this.getRoughBounds(matrix)._containsPoint(point))
			return false;
		var curves = this.getCurves(),
			crossings = 0,
			roots = [];
		for (var i = 0, l = curves.length; i < l; i++)
			crossings += curves[i].getCrossings(point, matrix, roots);
		return (crossings & 1) == 1;
	},

	_hitTest: function(point, options, matrix) {
		var tolerance = options.tolerance || 0,
			radius = (options.stroke ? this.getStrokeWidth() / 2 : 0) + tolerance,
			loc,
			res;
		var coords = [],
			that = this;
		function checkSegment(segment, ends) {
			segment._transformCoordinates(matrix, coords);
			for (var j = ends || options.segments ? 0 : 2,
					m = !ends && options.handles ? 6 : 2; j < m; j += 2) {
				if (point.getDistance(coords[j], coords[j + 1]) < tolerance)
					return new HitResult(j == 0 ? 'segment'
							: 'handle-' + (j == 2 ? 'in' : 'out'),
							that, { segment: segment });
			}
		}
		if (options.ends && !options.segments && !this._closed) {
			if (res = checkSegment(this.getFirstSegment(), true)
					|| checkSegment(this.getLastSegment(), true))
				return res;
		} else if (options.segments || options.handles) {
			for (var i = 0, l = this._segments.length; i < l; i++) {
				if (res = checkSegment(this._segments[i]))
					return res;
			}
		}
		if (options.stroke && radius > 0)
			loc = this.getNearestLocation(point, matrix);
		if (!(loc && loc._distance <= radius) && options.fill
				&& this.getFillColor() && this.contains(point, matrix))
			return new HitResult('fill', this);
		if (!loc && options.stroke && radius > 0)
			loc = this.getNearestLocation(point, matrix);
		if (loc && loc._distance <= radius)
			return options.stroke
					? new HitResult('stroke', this, { location: loc })
					: new HitResult('fill', this);
	}

}, new function() { 

	function drawHandles(ctx, segments) {
		for (var i = 0, l = segments.length; i < l; i++) {
			var segment = segments[i],
				point = segment._point,
				state = segment._selectionState,
				selected = state & SelectionState.POINT;
			if (selected || (state & SelectionState.HANDLE_IN))
				drawHandle(ctx, point, segment._handleIn);
			if (selected || (state & SelectionState.HANDLE_OUT))
				drawHandle(ctx, point, segment._handleOut);
			ctx.save();
			ctx.beginPath();
			ctx.rect(point._x - 2, point._y - 2, 4, 4);
			ctx.fill();
			if (!selected) {
				ctx.beginPath();
				ctx.rect(point._x - 1, point._y - 1, 2, 2);
				ctx.fillStyle = '#ffffff';
				ctx.fill();
				ctx.restore();
			}
		}
	}

	function drawHandle(ctx, point, handle) {
		if (!handle.isZero()) {
			var handleX = point._x + handle._x,
				handleY = point._y + handle._y;
			ctx.beginPath();
			ctx.moveTo(point._x, point._y);
			ctx.lineTo(handleX, handleY);
			ctx.stroke();
			ctx.beginPath();
			ctx.arc(handleX, handleY, 1.75, 0, Math.PI * 2, true);
			ctx.fill();
		}
	}

	function drawSegments(ctx, path) {
		var segments = path._segments,
			length = segments.length,
			handleOut, outX, outY;

		function drawSegment(i) {
			var segment = segments[i],
				point = segment._point,
				x = point._x,
				y = point._y,
				handleIn = segment._handleIn;
			if (!handleOut) {
				ctx.moveTo(x, y);
			} else {
				if (handleIn.isZero() && handleOut.isZero()) {
					ctx.lineTo(x, y);
				} else {
					ctx.bezierCurveTo(outX, outY,
							handleIn._x + x, handleIn._y + y, x, y);
				}
			}
			handleOut = segment._handleOut;
			outX = handleOut._x + x;
			outY = handleOut._y + y;
		}

		for (var i = 0; i < length; i++)
			drawSegment(i);
		if (path._closed && length > 1)
			drawSegment(0);
	}

	function drawDashes(ctx, path, dashArray, dashOffset) {
		var flattener = new PathFlattener(path),
			from = dashOffset, to,
			i = 0;
		while (from < flattener.length) {
			to = from + dashArray[(i++) % dashArray.length];
			flattener.drawPart(ctx, from, to);
			from = to + dashArray[(i++) % dashArray.length];
		}
	}

	return {
		draw: function(ctx, param) {
			if (!param.compound)
				ctx.beginPath();

			var fillColor = this.getFillColor(),
				strokeColor = this.getStrokeColor(),
				dashArray = this.getDashArray() || [], 
				hasDash = !!dashArray.length;

			if (param.compound || param.selection || this._clipMask || fillColor
					|| strokeColor && !hasDash) {
				drawSegments(ctx, this);
			}

			if (param.selection) {
				ctx.stroke();
				drawHandles(ctx, this._segments);
			} else if (this._clipMask) {
				ctx.clip();
			} else if (!param.compound && (fillColor || strokeColor)) {
				ctx.save();
				this._setStyles(ctx);
				if (!fillColor || !strokeColor)
					ctx.globalAlpha = this._opacity;
				if (fillColor) {
					ctx.fillStyle = fillColor.getCanvasStyle(ctx);
					ctx.fill();
				}
				if (strokeColor) {
					ctx.strokeStyle = strokeColor.getCanvasStyle(ctx);
					if (hasDash) {
						ctx.beginPath();
						drawDashes(ctx, this, dashArray, this.getDashOffset());
					}
					ctx.stroke();
				}
				ctx.restore();
			}
		}
	};
}, new function() { 

	function getFirstControlPoints(rhs) {
		var n = rhs.length,
			x = [], 
			tmp = [], 
			b = 2;
		x[0] = rhs[0] / b;
		for (var i = 1; i < n; i++) {
			tmp[i] = 1 / b;
			b = (i < n - 1 ? 4 : 2) - tmp[i];
			x[i] = (rhs[i] - x[i - 1]) / b;
		}
		for (var i = 1; i < n; i++) {
			x[n - i - 1] -= tmp[n - i] * x[n - i];
		}
		return x;
	};

	var styles = {
		getStrokeWidth: 'lineWidth',
		getStrokeJoin: 'lineJoin',
		getStrokeCap: 'lineCap',
		getMiterLimit: 'miterLimit'
	};

	return {
		_setStyles: function(ctx) {
			for (var i in styles) {
				var style = this._style[i]();
				if (style)
					ctx[styles[i]] = style;
			}
		},

		smooth: function() {
			var segments = this._segments,
				size = segments.length,
				n = size,
				overlap;

			if (size <= 2)
				return;

			if (this._closed) {
				overlap = Math.min(size, 4);
				n += Math.min(size, overlap) * 2;
			} else {
				overlap = 0;
			}
			var knots = [];
			for (var i = 0; i < size; i++)
				knots[i + overlap] = segments[i]._point;
			if (this._closed) {
				for (var i = 0; i < overlap; i++) {
					knots[i] = segments[i + size - overlap]._point;
					knots[i + size + overlap] = segments[i]._point;
				}
			} else {
				n--;
			}
			var rhs = [];

			for (var i = 1; i < n - 1; i++)
				rhs[i] = 4 * knots[i]._x + 2 * knots[i + 1]._x;
			rhs[0] = knots[0]._x + 2 * knots[1]._x;
			rhs[n - 1] = 3 * knots[n - 1]._x;
			var x = getFirstControlPoints(rhs);

			for (var i = 1; i < n - 1; i++)
				rhs[i] = 4 * knots[i]._y + 2 * knots[i + 1]._y;
			rhs[0] = knots[0]._y + 2 * knots[1]._y;
			rhs[n - 1] = 3 * knots[n - 1]._y;
			var y = getFirstControlPoints(rhs);

			if (this._closed) {
				for (var i = 0, j = size; i < overlap; i++, j++) {
					var f1 = (i / overlap);
					var f2 = 1 - f1;
					x[j] = x[i] * f1 + x[j] * f2;
					y[j] = y[i] * f1 + y[j] * f2;
					var ie = i + overlap, je = j + overlap;
					x[je] = x[ie] * f2 + x[je] * f1;
					y[je] = y[ie] * f2 + y[je] * f1;
				}
				n--;
			}
			var handleIn = null;
			for (var i = overlap; i <= n - overlap; i++) {
				var segment = segments[i - overlap];
				if (handleIn)
					segment.setHandleIn(handleIn.subtract(segment._point));
				if (i < n) {
					segment.setHandleOut(
							new Point(x[i], y[i]).subtract(segment._point));
					if (i < n - 1)
						handleIn = new Point(
								2 * knots[i + 1]._x - x[i + 1],
								2 * knots[i + 1]._y - y[i + 1]);
					else
						handleIn = new Point(
								(knots[n]._x + x[n - 1]) / 2,
								(knots[n]._y + y[n - 1]) / 2);
				}
			}
			if (this._closed && handleIn) {
				var segment = this._segments[0];
				segment.setHandleIn(handleIn.subtract(segment._point));
			}
		}
	};
}, new function() { 
	function getCurrentSegment(that) {
		var segments = that._segments;
		if (segments.length == 0)
			throw new Error('Use a moveTo() command first');
		return segments[segments.length - 1];
	}

	return {
		moveTo: function(point) {
			if (!this._segments.length)
				this._add([ new Segment(Point.read(arguments)) ]);
		},

		moveBy: function(point) {
			throw new Error('moveBy() is unsupported on Path items.');
		},

		lineTo: function(point) {
			this._add([ new Segment(Point.read(arguments)) ]);
		},

		cubicCurveTo: function(handle1, handle2, to) {
			handle1 = Point.read(arguments, 0, 1);
			handle2 = Point.read(arguments, 1, 1);
			to = Point.read(arguments, 2, 1);
			var current = getCurrentSegment(this);
			current.setHandleOut(handle1.subtract(current._point));
			this._add([ new Segment(to, handle2.subtract(to)) ]);
		},

		quadraticCurveTo: function(handle, to) {
			handle = Point.read(arguments, 0, 1);
			to = Point.read(arguments, 1, 1);
			var current = getCurrentSegment(this)._point;
			this.cubicCurveTo(
				handle.add(current.subtract(handle).multiply(1/3)),
				handle.add(to.subtract(handle).multiply(1/3)),
				to
			);
		},

		curveTo: function(through, to, parameter) {
			through = Point.read(arguments, 0, 1);
			to = Point.read(arguments, 1, 1);
			var t = Base.pick(parameter, 0.5),
				t1 = 1 - t,
				current = getCurrentSegment(this)._point,
				handle = through.subtract(current.multiply(t1 * t1))
					.subtract(to.multiply(t * t)).divide(2 * t * t1);
			if (handle.isNaN())
				throw new Error(
					'Cannot put a curve through points with parameter = ' + t);
			this.quadraticCurveTo(handle, to);
		},

		arcTo: function(to, clockwise ) {
			var current = getCurrentSegment(this),
				from = current._point,
				through;
			if (clockwise === undefined)
				clockwise = true;
			if (typeof clockwise === 'boolean') {
				to = Point.read(arguments, 0, 1);
				var middle = from.add(to).divide(2),
				through = middle.add(middle.subtract(from).rotate(
						clockwise ? -90 : 90));
			} else {
				through = Point.read(arguments, 0, 1);
				to = Point.read(arguments, 1, 1);
			}
			var l1 = new Line(from.add(through).divide(2),
					through.subtract(from).rotate(90)),
			 	l2 = new Line(through.add(to).divide(2),
					to.subtract(through).rotate(90)),
				center = l1.intersect(l2),
				line = new Line(from, to, true),
				throughSide = line.getSide(through);
			if (!center) {
				if (!throughSide)
					return this.lineTo(to);
				throw new Error("Cannot put an arc through the given points: "
					+ [from, through, to]);
			}
			var vector = from.subtract(center),
				radius = vector.getLength(),
				extent = vector.getDirectedAngle(to.subtract(center)),
				centerSide = line.getSide(center);
			if (centerSide == 0) {
				extent = throughSide * Math.abs(extent);
			} else if (throughSide == centerSide) {
				extent -= 360 * (extent < 0 ? -1 : 1);
			}
			var ext = Math.abs(extent),
				count =  ext >= 360 ? 4 : Math.ceil(ext / 90),
				inc = extent / count,
				half = inc * Math.PI / 360,
				z = 4 / 3 * Math.sin(half) / (1 + Math.cos(half)),
				segments = [];
			for (var i = 0; i <= count; i++) {
				var pt = i < count ? center.add(vector) : to;
				var out = i < count ? vector.rotate(90).multiply(z) : null;
				if (i == 0) {
					current.setHandleOut(out);
				} else {
					segments.push(
						new Segment(pt, vector.rotate(-90).multiply(z), out));
				}
				vector = vector.rotate(inc);
			}
			this._add(segments);
		},

		lineBy: function(vector) {
			vector = Point.read(arguments);
			var current = getCurrentSegment(this);
			this.lineTo(current._point.add(vector));
		},

		curveBy: function(throughVector, toVector, parameter) {
			throughVector = Point.read(throughVector);
			toVector = Point.read(toVector);
			var current = getCurrentSegment(this)._point;
			this.curveTo(current.add(throughVector), current.add(toVector),
					parameter);
		},

		arcBy: function(throughVector, toVector) {
			throughVector = Point.read(throughVector);
			toVector = Point.read(toVector);
			var current = getCurrentSegment(this)._point;
			this.arcBy(current.add(throughVector), current.add(toVector));
		},

		closePath: function() {
			this.setClosed(true);
		}
	};
}, new function() { 

	function getBounds(that, matrix, strokePadding) {
		var segments = that._segments,
			first = segments[0];
		if (!first)
			return null;
		var coords = new Array(6),
			prevCoords = new Array(6);
		if (matrix && matrix.isIdentity())
			matrix = null;
		first._transformCoordinates(matrix, prevCoords, false);
		var min = prevCoords.slice(0, 2),
			max = min.slice(0), 
			tMin = Numerical.TOLERANCE,
			tMax = 1 - tMin;
		function processSegment(segment) {
			segment._transformCoordinates(matrix, coords, false);

			for (var i = 0; i < 2; i++) {
				var v0 = prevCoords[i], 
					v1 = prevCoords[i + 4], 
					v2 = coords[i + 2], 
					v3 = coords[i]; 

				function add(value, t) {
					var padding = 0;
					if (value == null) {
						var u = 1 - t;
						value = u * u * u * v0
								+ 3 * u * u * t * v1
								+ 3 * u * t * t * v2
								+ t * t * t * v3;
						padding = strokePadding ? strokePadding[i] : 0;
					}
					var left = value - padding,
						right = value + padding;
					if (left < min[i])
						min[i] = left;
					if (right > max[i])
						max[i] = right;

				}
				add(v3, null);

				var a = 3 * (v1 - v2) - v0 + v3,
					b = 2 * (v0 + v2) - 4 * v1,
					c = v1 - v0;

				if (a == 0) {
					if (b == 0)
					    continue;
					var t = -c / b;
					if (tMin < t && t < tMax)
						add(null, t);
					continue;
				}

				var q = b * b - 4 * a * c;
				if (q < 0)
					continue;
				var sqrt = Math.sqrt(q),
					f = -0.5 / a,
				 	t1 = (b - sqrt) * f,
					t2 = (b + sqrt) * f;
				if (tMin < t1 && t1 < tMax)
					add(null, t1);
				if (tMin < t2 && t2 < tMax)
					add(null, t2);
			}
			var tmp = prevCoords;
			prevCoords = coords;
			coords = tmp;
		}
		for (var i = 1, l = segments.length; i < l; i++)
			processSegment(segments[i]);
		if (that._closed)
			processSegment(first);
		return Rectangle.create(min[0], min[1],
					max[0] - min[0], max[1] - min[1]);
	}

	function getPenPadding(radius, matrix) {
		if (!matrix)
			return [radius, radius];
		var mx = matrix.createShiftless(),
			hor = mx.transform(new Point(radius, 0)),
			ver = mx.transform(new Point(0, radius)),
			phi = hor.getAngleInRadians(),
			a = hor.getLength(),
			b = ver.getLength();
		var tx = - Math.atan(b * Math.tan(phi)),
			ty = + Math.atan(b / Math.tan(phi)),
			x = a * Math.cos(tx) * Math.cos(phi)
				- b * Math.sin(tx) * Math.sin(phi),
			y = b * Math.sin(ty) * Math.cos(phi)
				+ a * Math.cos(ty) * Math.sin(phi);
		return [Math.abs(x), Math.abs(y)];
	}

	return {
		getBounds: function() {
			var useCache = arguments[0] === undefined;
			if (useCache && this._bounds)
				return this._bounds;
			var bounds = this._createBounds(getBounds(this, arguments[0]));
			if (useCache)
				this._bounds = bounds;
			return bounds;
		},

		getStrokeBounds: function() {
			if (!this._style._strokeColor || !this._style._strokeWidth)
				return this.getBounds.apply(this, arguments);
			var useCache = arguments[0] === undefined;
			if (useCache && this._strokeBounds)
				return this._strokeBounds;
			var matrix = arguments[0], 
				width = this.getStrokeWidth(),
				radius = width / 2,
				padding = getPenPadding(radius, matrix),
				join = this.getStrokeJoin(),
				cap = this.getStrokeCap(),
				miter = this.getMiterLimit() * width / 2,
				segments = this._segments,
				length = segments.length,
				bounds = getBounds(this, matrix, getPenPadding(radius));
			var joinBounds = new Rectangle(new Size(padding).multiply(2));

			function add(point) {
				bounds = bounds.include(matrix
					? matrix.transform(point) : point);
			}

			function addBevelJoin(curve, t) {
				var point = curve.getPoint(t),
					normal = curve.getNormal(t).normalize(radius);
				add(point.add(normal));
				add(point.subtract(normal));
			}

			function addJoin(segment, join) {
				if (join === 'round' || !segment._handleIn.isZero()
						&& !segment._handleOut.isZero()) {
					bounds = bounds.unite(joinBounds.setCenter(matrix
						? matrix.transform(segment._point) : segment._point));
				} else if (join == 'bevel') {
					var curve = segment.getCurve();
					addBevelJoin(curve, 0);
					addBevelJoin(curve.getPrevious(), 1);
				} else if (join == 'miter') {
					var curve2 = segment.getCurve(),
						curve1 = curve2.getPrevious(),
						point = curve2.getPoint(0),
						normal1 = curve1.getNormal(1).normalize(radius),
						normal2 = curve2.getNormal(0).normalize(radius),
						line1 = new Line(point.subtract(normal1),
								new Point(-normal1.y, normal1.x)),
						line2 = new Line(point.subtract(normal2),
								new Point(-normal2.y, normal2.x)),
						corner = line1.intersect(line2);
					if (!corner || point.getDistance(corner) > miter) {
						addJoin(segment, 'bevel');
					} else {
						add(corner);
					}
				}
			}

			function addCap(segment, cap, t) {
				switch (cap) {
				case 'round':
					return addJoin(segment, cap);
				case 'butt':
				case 'square':
					var curve = segment.getCurve(),
						point = curve.getPoint(t),
						normal = curve.getNormal(t).normalize(radius);
					if (cap === 'square')
						point = point.add(normal.y, -normal.x);
					add(point.add(normal));
					add(point.subtract(normal));
					break;
				}
			}

			for (var i = 1, l = length - (this._closed ? 0 : 1); i < l; i++) {
				addJoin(segments[i], join);
			}
			if (this._closed) {
				addJoin(segments[0], join);
			} else {
				addCap(segments[0], cap, 0);
				addCap(segments[length - 1], cap, 1);
			}
			if (useCache)
				this._strokeBounds = bounds;
			return bounds;
		},

		getHandleBounds: function() {
			var matrix = arguments[0],
				useCache = matrix === undefined;
			if (useCache && this._handleBounds)
				return this._handleBounds;
			var coords = new Array(6),
				stroke = arguments[1] / 2 || 0, 
				join = arguments[2] / 2 || 0, 
				open = !this._closed,
				x1 = Infinity,
				x2 = -x1,
				y1 = x1,
				y2 = x2;
			for (var i = 0, l = this._segments.length; i < l; i++) {
				var segment = this._segments[i];
				segment._transformCoordinates(matrix, coords, false);
				for (var j = 0; j < 6; j += 2) {
					var padding = j == 0 ? join : stroke,
						x = coords[j],
						y = coords[j + 1],
						xn = x - padding,
						xx = x + padding,
						yn = y - padding,
						yx = y + padding;
					if (xn < x1) x1 = xn;
					if (xx > x2) x2 = xx;
					if (yn < y1) y1 = yn;
					if (yx > y2) y2 = yx;
				}
			}
			var bounds = Rectangle.create(x1, y1, x2 - x1, y2 - y1);
			if (useCache)
				this._handleBounds = bounds;
			return bounds;
		},

		getRoughBounds: function() {
			var useCache = arguments[0] === undefined;
			if (useCache && this._roughBounds)
				return this._roughBounds;
			var bounds = this.getHandleBounds(arguments[0], this.strokeWidth,
					this.getStrokeJoin() == 'miter'
						? this.strokeWidth * this.getMiterLimit()
						: this.strokeWidth);
			if (useCache)
				this._roughBounds = bounds;
			return bounds;
		}
	};
});

Path.inject({ statics: new function() {
	var kappa = 2 / 3 * (Math.sqrt(2) - 1);

	var ovalSegments = [
		new Segment([0, 0.5], [0, kappa ], [0, -kappa]),
		new Segment([0.5, 0], [-kappa, 0], [kappa, 0 ]),
		new Segment([1, 0.5], [0, -kappa], [0, kappa ]),
		new Segment([0.5, 1], [kappa, 0 ], [-kappa, 0])
	];

	return {
		Line: function() {
			var step = Math.floor(arguments.length / 2);
			return new Path(
				Segment.read(arguments, 0, step),
				Segment.read(arguments, step, step)
			);
		},

		Rectangle: function(rect) {
			rect = Rectangle.read(arguments);
			var left = rect.x,
				top = rect.y
				right = left + rect.width,
				bottom = top + rect.height,
				path = new Path();
			path._add([
				new Segment(Point.create(left, bottom)),
				new Segment(Point.create(left, top)),
				new Segment(Point.create(right, top)),
				new Segment(Point.create(right, bottom))
			]);
			path._closed = true;
			return path;
		},

		RoundRectangle: function(rect, size) {
			if (arguments.length == 2) {
				rect = Rectangle.read(arguments, 0, 1);
				size = Size.read(arguments, 1, 1);
			} else if (arguments.length == 6) {
				rect = Rectangle.read(arguments, 0, 4);
				size = Size.read(arguments, 4, 2);
			}
			size = Size.min(size, rect.getSize(true).divide(2));
			var path = new Path(),
				uSize = size.multiply(kappa * 2),
				bl = rect.getBottomLeft(true),
				tl = rect.getTopLeft(true),
				tr = rect.getTopRight(true),
				br = rect.getBottomRight(true);
			path._add([
				new Segment(bl.add(size.width, 0), null, [-uSize.width, 0]),
				new Segment(bl.subtract(0, size.height), [0, uSize.height], null),

				new Segment(tl.add(0, size.height), null, [0, -uSize.height]),
				new Segment(tl.add(size.width, 0), [-uSize.width, 0], null),

				new Segment(tr.subtract(size.width, 0), null, [uSize.width, 0]),
				new Segment(tr.add(0, size.height), [0, -uSize.height], null),

				new Segment(br.subtract(0, size.height), null, [0, uSize.height]),
				new Segment(br.subtract(size.width, 0), [uSize.width, 0], null)
			]);
			path._closed = true;
			return path;
		},

		Oval: function(rect) {
			rect = Rectangle.read(arguments);
			var path = new Path(),
				point = rect.getPoint(true),
				size = rect.getSize(true),
				segments = new Array(4);
			for (var i = 0; i < 4; i++) {
				var segment = ovalSegments[i];
				segments[i] = new Segment(
					segment._point.multiply(size).add(point),
					segment._handleIn.multiply(size),
					segment._handleOut.multiply(size)
				);
			}
			path._add(segments);
			path._closed = true;
			return path;
		},

		Circle: function(center, radius) {
			if (arguments.length == 3) {
				center = Point.read(arguments, 0, 2);
				radius = arguments[2];
			} else {
				center = Point.read(arguments, 0, 1);
			}
			return Path.Oval(new Rectangle(center.subtract(radius),
					Size.create(radius * 2, radius * 2)));
		},

		Arc: function(from, through, to) {
			var path = new Path();
			path.moveTo(from);
			path.arcTo(through, to);
			return path;
		},

		RegularPolygon: function(center, numSides, radius) {
			center = Point.read(arguments, 0, 1);
			var path = new Path(),
				step = 360 / numSides,
				three = !(numSides % 3),
				vector = new Point(0, three ? -radius : radius),
				offset = three ? -1 : 0.5,
				segments = new Array(numSides);
			for (var i = 0; i < numSides; i++) {
				segments[i] = new Segment(center.add(
					vector.rotate((i + offset) * step)));
			}
			path._add(segments);
			path._closed = true;
			return path;
		},

		Star: function(center, numPoints, radius1, radius2) {
			center = Point.read(arguments, 0, 1);
			numPoints *= 2;
			var path = new Path(),
				step = 360 / numPoints,
				vector = new Point(0, -1),
				segments = new Array(numPoints);
			for (var i = 0; i < numPoints; i++) {
				segments[i] = new Segment(center.add(
					vector.rotate(step * i).multiply(i % 2 ? radius2 : radius1)));
			}
			path._add(segments);
			path._closed = true;
			return path;
		}
	};
}});

var CompoundPath = this.CompoundPath = PathItem.extend({
	initialize: function(paths) {
		this.base();
		this._children = [];
		this._namedChildren = {};
		var items = !paths || !Array.isArray(paths)
				|| typeof paths[0] !== 'object' ? arguments : paths;
		this.addChildren(items);
	},

	insertChild: function(index, item) {
		this.base(index, item);
		if (item._clockwise === undefined)
			item.setClockwise(item._index == 0);
	},

	simplify: function() {
		if (this._children.length == 1) {
			var child = this._children[0];
			child.insertAbove(this);
			this.remove();
			return child;
		}
		return this;
	},

	smooth: function() {
		for (var i = 0, l = this._children.length; i < l; i++)
			this._children[i].smooth();
	},

	draw: function(ctx, param) {
		var l = this._children.length;
		if (l == 0) {
			return;
		}
		var firstChild = this._children[0];
		ctx.beginPath();
		param.compound = true;
		for (var i = 0; i < l; i++)
			Item.draw(this._children[i], ctx, param);
		firstChild._setStyles(ctx);
		var fillColor = firstChild.getFillColor(),
			strokeColor = firstChild.getStrokeColor();
		if (fillColor) {
			ctx.fillStyle = fillColor.getCanvasStyle(ctx);
			ctx.fill();
		}
		if (strokeColor) {
			ctx.strokeStyle = strokeColor.getCanvasStyle(ctx);
			ctx.stroke();
		}
		param.compound = false;
	}
}, new function() { 
	function getCurrentPath(that) {
		if (!that._children.length)
			throw new Error('Use a moveTo() command first');
		return that._children[that._children.length - 1];
	}

	var fields = {
		moveTo: function(point) {
			var path = new Path();
			this.addChild(path);
			path.moveTo.apply(path, arguments);
		},

		moveBy: function(point) {
			this.moveTo(getCurrentPath(this).getLastSegment()._point.add(
					Point.read(arguments)));
		},

		closePath: function() {
			getCurrentPath(this).setClosed(true);
		}
	};

	Base.each(['lineTo', 'cubicCurveTo', 'quadraticCurveTo', 'curveTo',
			'arcTo', 'lineBy', 'curveBy', 'arcBy'], function(key) {
		fields[key] = function() {
			var path = getCurrentPath(this);
			path[key].apply(path, arguments);
		};
	});

	return fields;
});

var PathFlattener = Base.extend({
	initialize: function(path) {
		this.curves = []; 
		this.parts = []; 
		this.length = 0; 
		this.index = 0;

		var segments = path._segments,
			segment1 = segments[0],
			segment2,
			that = this;

		function addCurve(segment1, segment2) {
			var curve = Curve.getValues(segment1, segment2);
			that.curves.push(curve);
			that._computeParts(curve, segment1._index, 0, 1);
		}

		for (var i = 1, l = segments.length; i < l; i++) {
			segment2 = segments[i];
			addCurve(segment1, segment2);
			segment1 = segment2;
		}
		if (path._closed)
			addCurve(segment2, segments[0]);
	},

	_computeParts: function(curve, index, minT, maxT) {
		if ((maxT - minT) > 1 / 32 && !Curve.isFlatEnough(curve)) {
			var curves = Curve.subdivide(curve);
			var halfT = (minT + maxT) / 2;
			this._computeParts(curves[0], index, minT, halfT);
			this._computeParts(curves[1], index, halfT, maxT);
		} else {
			var x = curve[6] - curve[0],
				y = curve[7] - curve[1],
				dist = Math.sqrt(x * x + y * y);
			if (dist > Numerical.TOLERANCE) {
				this.length += dist;
				this.parts.push({
					offset: this.length,
					value: maxT,
					index: index
				});
			}
		}
	},

	getParameterAt: function(offset) {
		var i, j = this.index;
		for (;;) {
			i = j;
			if (j == 0 || this.parts[--j].offset < offset)
				break;
		}
		for (var l = this.parts.length; i < l; i++) {
			var part = this.parts[i];
			if (part.offset >= offset) {
				this.index = i;
				var prev = this.parts[i - 1];
				var prevVal = prev && prev.index == part.index ? prev.value : 0,
					prevLen = prev ? prev.offset : 0;
				return {
					value: prevVal + (part.value - prevVal)
						* (offset - prevLen) /  (part.offset - prevLen),
					index: part.index
				};
			}
		}
		var part = this.parts[this.parts.length - 1];
		return {
			value: 1,
			index: part.index
		};
	},

	evaluate: function(offset, type) {
		var param = this.getParameterAt(offset);
		return Curve.evaluate(this.curves[param.index], param.value, type);
	},

	drawPart: function(ctx, from, to) {
		from = this.getParameterAt(from);
		to = this.getParameterAt(to);
		for (var i = from.index; i <= to.index; i++) {
			var curve = Curve.getPart(this.curves[i],
					i == from.index ? from.value : 0,
					i == to.index ? to.value : 1);
			if (i == from.index)
				ctx.moveTo(curve[0], curve[1]);
			ctx.bezierCurveTo.apply(ctx, curve.slice(2));
		}
	}
});

var PathFitter = Base.extend({
	initialize: function(path, error) {
		this.points = [];
		var segments = path._segments,
			prev;
		for (var i = 0, l = segments.length; i < l; i++) {
			var point = segments[i].point.clone();
			if (!prev || !prev.equals(point)) {
				this.points.push(point);
				prev = point;
			}
		}
		this.error = error;
	},

	fit: function() {
		this.segments = [new Segment(this.points[0])];
		this.fitCubic(0, this.points.length - 1,
				this.points[1].subtract(this.points[0]).normalize(),
				this.points[this.points.length - 2].subtract(
					this.points[this.points.length - 1]).normalize());
		return this.segments;
	},

	fitCubic: function(first, last, tan1, tan2) {
		if (last - first == 1) {
			var pt1 = this.points[first],
				pt2 = this.points[last],
				dist = pt1.getDistance(pt2) / 3;
			this.addCurve([pt1, pt1.add(tan1.normalize(dist)),
					pt2.add(tan2.normalize(dist)), pt2]);
			return;
		}
		var uPrime = this.chordLengthParameterize(first, last),
			maxError = Math.max(this.error, this.error * this.error),
			error,
			split;
		for (var i = 0; i <= 4; i++) {
			var curve = this.generateBezier(first, last, uPrime, tan1, tan2);
			var max = this.findMaxError(first, last, curve, uPrime);
			if (max.error < this.error) {
				this.addCurve(curve);
				return;
			}
			split = max.index;
			if (max.error >= maxError)
				break;
			this.reparameterize(first, last, uPrime, curve);
			maxError = max.error;
		}
		var V1 = this.points[split - 1].subtract(this.points[split]),
			V2 = this.points[split].subtract(this.points[split + 1]),
			tanCenter = V1.add(V2).divide(2).normalize();
		this.fitCubic(first, split, tan1, tanCenter);
		this.fitCubic(split, last, tanCenter.negate(), tan2);
	},

	addCurve: function(curve) {
		var prev = this.segments[this.segments.length - 1];
		prev.setHandleOut(curve[1].subtract(curve[0]));
		this.segments.push(
				new Segment(curve[3], curve[2].subtract(curve[3])));
	},

	generateBezier: function(first, last, uPrime, tan1, tan2) {
		var epsilon = Numerical.EPSILON,
			pt1 = this.points[first],
			pt2 = this.points[last],
		 	C = [[0, 0], [0, 0]],
			X = [0, 0];

		for (var i = 0, l = last - first + 1; i < l; i++) {
			var u = uPrime[i],
				t = 1 - u,
				b = 3 * u * t,
				b0 = t * t * t,
				b1 = b * t,
				b2 = b * u,
				b3 = u * u * u,
				a1 = tan1.normalize(b1),
				a2 = tan2.normalize(b2),
				tmp = this.points[first + i]
					.subtract(pt1.multiply(b0 + b1))
					.subtract(pt2.multiply(b2 + b3));
			C[0][0] += a1.dot(a1);
			C[0][1] += a1.dot(a2);
			C[1][0] = C[0][1];
			C[1][1] += a2.dot(a2);
			X[0] += a1.dot(tmp);
			X[1] += a2.dot(tmp);
		}

		var detC0C1 = C[0][0] * C[1][1] - C[1][0] * C[0][1],
			alpha1, alpha2;
		if (Math.abs(detC0C1) > epsilon) {
			var detC0X  = C[0][0] * X[1]    - C[1][0] * X[0],
				detXC1  = X[0]    * C[1][1] - X[1]    * C[0][1];
			alpha1 = detXC1 / detC0C1;
			alpha2 = detC0X / detC0C1;
		} else {
			var c0 = C[0][0] + C[0][1],
				c1 = C[1][0] + C[1][1];
			if (Math.abs(c0) > epsilon) {
				alpha1 = alpha2 = X[0] / c0;
			} else if (Math.abs(c0) > epsilon) {
				alpha1 = alpha2 = X[1] / c1;
			} else {
				alpha1 = alpha2 = 0.;
			}
		}

		var segLength = pt2.getDistance(pt1);
		epsilon *= segLength;
		if (alpha1 < epsilon || alpha2 < epsilon) {
			alpha1 = alpha2 = segLength / 3;
		}

		return [pt1, pt1.add(tan1.normalize(alpha1)),
				pt2.add(tan2.normalize(alpha2)), pt2];
	},

	reparameterize: function(first, last, u, curve) {
		for (var i = first; i <= last; i++) {
			u[i - first] = this.findRoot(curve, this.points[i], u[i - first]);
		}
	},

	findRoot: function(curve, point, u) {
		var curve1 = [],
			curve2 = [];
		for (var i = 0; i <= 2; i++) {
			curve1[i] = curve[i + 1].subtract(curve[i]).multiply(3);
		}
		for (var i = 0; i <= 1; i++) {
			curve2[i] = curve1[i + 1].subtract(curve1[i]).multiply(2);
		}
		var pt = this.evaluate(3, curve, u),
		 	pt1 = this.evaluate(2, curve1, u),
		 	pt2 = this.evaluate(1, curve2, u),
		 	diff = pt.subtract(point),
			df = pt1.dot(pt1) + diff.dot(pt2);
		if (Math.abs(df) < Numerical.TOLERANCE)
			return u;
		return u - diff.dot(pt1) / df;
	},

	evaluate: function(degree, curve, t) {
		var tmp = curve.slice();
		for (var i = 1; i <= degree; i++) {
			for (var j = 0; j <= degree - i; j++) {
				tmp[j] = tmp[j].multiply(1 - t).add(tmp[j + 1].multiply(t));
			}
		}
		return tmp[0];
	},

	chordLengthParameterize: function(first, last) {
		var u = [0];
		for (var i = first + 1; i <= last; i++) {
			u[i - first] = u[i - first - 1]
					+ this.points[i].getDistance(this.points[i - 1]);
		}
		for (var i = 1, m = last - first; i <= m; i++) {
			u[i] /= u[m];
		}
		return u;
	},

	findMaxError: function(first, last, curve, u) {
		var index = Math.floor((last - first + 1) / 2),
			maxDist = 0;
		for (var i = first + 1; i < last; i++) {
			var P = this.evaluate(3, curve, u[i - first]);
			var v = P.subtract(this.points[i]);
			var dist = v.x * v.x + v.y * v.y; 
			if (dist >= maxDist) {
				maxDist = dist;
				index = i;
			}
		}
		return {
			error: maxDist,
			index: index
		};
	}
});

var TextItem = this.TextItem = Item.extend({
	initialize: function() {
		this.base();
		this._content = '';
		this._characterStyle = CharacterStyle.create(this);
		this.setCharacterStyle(this._project.getCurrentStyle());
		this._paragraphStyle = ParagraphStyle.create(this);
		this.setParagraphStyle();
	},

	_clone: function(copy) {
		copy._content = this._content;
		copy.setCharacterStyle(this._characterStyle);
		copy.setParagraphStyle(this._paragraphStyle);
		return this.base(copy);
	},

	getContent: function() {
		return this._content;
	},

	setContent: function(content) {
		this._changed(Change.CONTENT);
		this._content = '' + content;
	},

	getCharacterStyle: function() {
		return this._characterStyle;
	},

	setCharacterStyle: function(style) {
		this._characterStyle.initialize(style);
	},

	getParagraphStyle: function() {
		return this._paragraphStyle;
	},

	setParagraphStyle: function(style) {
		this._paragraphStyle.initialize(style);
	}
});

var PointText = this.PointText = TextItem.extend({
	initialize: function(point) {
		this.base();
		this._point = Point.read(arguments).clone();
		this._matrix = new Matrix().translate(this._point);
	},

	clone: function() {
		var copy = this._clone(new PointText(this._point));
		copy._matrix.initialize(this._matrix);
		return copy;
	},

	getPoint: function() {
		return LinkedPoint.create(this, 'setPoint',
				this._point.x, this._point.y);
	},

	setPoint: function(point) {
		this.translate(Point.read(arguments).subtract(this._point));
	},

	getPosition: function() {
		return this.getPoint();
	},

	setPosition: function(point) {
		this.setPoint.apply(this, arguments);
	},

	_transform: function(matrix, flags) {
		this._matrix.preConcatenate(matrix);
		matrix._transformPoint(this._point, this._point);
	},

	draw: function(ctx) {
		if (!this._content)
			return;
		ctx.save();
		ctx.font = this.getFontSize() + 'pt ' + this.getFont();
		ctx.textAlign = this.getJustification();
		this._matrix.applyToContext(ctx);

		var fillColor = this.getFillColor();
		var strokeColor = this.getStrokeColor();
		if (!fillColor || !strokeColor)
			ctx.globalAlpha = this._opacity;
		if (fillColor) {
			ctx.fillStyle = fillColor.getCanvasStyle(ctx);
			ctx.fillText(this._content, 0, 0);
		}
		if (strokeColor) {
			ctx.strokeStyle = strokeColor.getCanvasStyle(ctx);
			ctx.strokeText(this._content, 0, 0);
		}
		ctx.restore();
	}
});

var Style = Item.extend({
	initialize: function(style) {
		var clone = style instanceof Style;
		return Base.each(this._defaults, function(value, key) {
			value = style && style[key] || value;
			this[key] = value && clone && value.clone
					? value.clone() : value;
		}, this);
	},

	statics: {
		create: function(item) {
			var style = new this(this.dont);
			style._item = item;
			return style;
		},

		extend: function(src) {
			var styleKey = src._style,
				flags = src._flags || {};
			src._owner.inject(Base.each(src._defaults, function(value, key) {
				var isColor = !!key.match(/Color$/),
					part = Base.capitalize(key),
					set = 'set' + part,
					get = 'get' + part;
				src[set] = function(value) {
					var children = this._item && this._item._children;
					value = isColor ? Color.read(arguments) : value;
					if (children) {
						for (var i = 0, l = children.length; i < l; i++)
							children[i][styleKey][set](value);
					} else {
						var old = this['_' + key];
						if (old != value && !(old && old.equals
									&& old.equals(value))) {
							this['_' + key] = value;
							if (isColor) {
								if (old)
									old._removeOwner(this._item);
								if (value)
									value._addOwner(this._item);
							}
							if (this._item)
								this._item._changed(flags[key] || Change.STYLE);
						}
					}
					return this;
				};
				src[get] = function() {
					var children = this._item && this._item._children,
						style;
					if (!children)
						return this['_' + key];
					for (var i = 0, l = children.length; i < l; i++) {
						var childStyle = children[i][styleKey][get]();
						if (!style) {
							style = childStyle;
						} else if (style != childStyle && !(style
								&& style.equals && style.equals(childStyle))) {
							return undefined;
						}
					}
					return style;
				};
				this[set] = function(value) {
					this[styleKey][set](value);
					return this;
				};
				this[get] = function() {
					return this[styleKey][get]();
				};
			}, {}));
			return this.base(src);
		}
	}
});

var PathStyle = this.PathStyle = Style.extend({
	_defaults: {
		fillColor: undefined,
		strokeColor: undefined,
		strokeWidth: 1,
		strokeCap: 'butt',
		strokeJoin: 'miter',
		miterLimit: 10,
		dashOffset: 0,
		dashArray: []
	},
	_flags: {
		strokeWidth: Change.STROKE,
		strokeCap: Change.STROKE,
		strokeJoin: Change.STROKE,
		miterLimit: Change.STROKE
	},
	_owner: Item,
	_style: '_style'

});

var ParagraphStyle = this.ParagraphStyle = Style.extend({
	_defaults: {
		justification: 'left'
	},
	_owner: TextItem,
	_style: '_paragraphStyle'

});

var CharacterStyle = this.CharacterStyle = PathStyle.extend({
	_defaults: Base.merge(PathStyle.prototype._defaults, {
		fillColor: 'black',
		fontSize: 10,
		font: 'sans-serif'
	}),
	_owner: TextItem,
	_style: '_characterStyle'

});

var Color = this.Color = Base.extend(new function() {

	var components = {
		gray: ['gray'],
		rgb: ['red', 'green', 'blue'],
		hsb: ['hue', 'saturation', 'brightness'],
		hsl: ['hue', 'saturation', 'lightness']
	};

	var colorCache = {},
		colorContext;

	function nameToRGBColor(name) {
		var color = colorCache[name];
		if (color)
			return color.clone();
		if (!colorContext) {
			var canvas = CanvasProvider.getCanvas(Size.create(1, 1));
			colorContext = canvas.getContext('2d');
			colorContext.globalCompositeOperation = 'copy';
		}
		colorContext.fillStyle = 'rgba(0,0,0,0)';
		colorContext.fillStyle = name;
		colorContext.fillRect(0, 0, 1, 1);
		var data = colorContext.getImageData(0, 0, 1, 1).data,
			rgb = [data[0] / 255, data[1] / 255, data[2] / 255];
		return (colorCache[name] = RGBColor.read(rgb)).clone();
	}

	function hexToRGBColor(string) {
		var hex = string.match(/^#?(\w{1,2})(\w{1,2})(\w{1,2})$/);
		if (hex.length >= 4) {
			var rgb = new Array(3);
			for (var i = 0; i < 3; i++) {
				var channel = hex[i + 1];
				rgb[i] = parseInt(channel.length == 1
						? channel + channel : channel, 16) / 255;
			}
			return RGBColor.read(rgb);
		}
	}

	var hsbIndices = [
		[0, 3, 1], 
		[2, 0, 1], 
		[1, 0, 3], 
		[1, 2, 0], 
		[3, 1, 0], 
		[0, 1, 2]  
	];

	var converters = {
		'rgb-hsb': function(color) {
			var r = color._red,
				g = color._green,
				b = color._blue,
				max = Math.max(r, g, b),
				min = Math.min(r, g, b),
				delta = max - min,
				h = delta == 0 ? 0
					:   ( max == r ? (g - b) / delta + (g < b ? 6 : 0)
						: max == g ? (b - r) / delta + 2
						:            (r - g) / delta + 4) * 60, 
				s = max == 0 ? 0 : delta / max,
				v = max; 
			return new HSBColor(h, s, v, color._alpha);
		},

		'hsb-rgb': function(color) {
			var h = (color._hue / 60) % 6, 
				s = color._saturation,
				b = color._brightness,
				i = Math.floor(h), 
				f = h - i,
				i = hsbIndices[i],
				v = [
					b,						
					b * (1 - s),			
					b * (1 - s * f),		
					b * (1 - s * (1 - f))	
				];
			return new RGBColor(v[i[0]], v[i[1]], v[i[2]], color._alpha);
		},

		'rgb-hsl': function(color) {
			var r = color._red,
				g = color._green,
				b = color._blue,
				max = Math.max(r, g, b),
				min = Math.min(r, g, b),
				delta = max - min,
				achromatic = delta == 0,
				h = achromatic ? 0
					:   ( max == r ? (g - b) / delta + (g < b ? 6 : 0)
						: max == g ? (b - r) / delta + 2
						:            (r - g) / delta + 4) * 60, 
				l = (max + min) / 2,
				s = achromatic ? 0 : l < 0.5
						? delta / (max + min)
						: delta / (2 - max - min);
			return new HSLColor(h, s, l, color._alpha);
		},

		'hsl-rgb': function(color) {
			var s = color._saturation,
				h = color._hue / 360,
				l = color._lightness,
				t1, t2, c;
			if (s == 0)
				return new RGBColor(l, l, l, color._alpha);
			var t3s = [ h + 1 / 3, h, h - 1 / 3 ],
				t2 = l < 0.5 ? l * (1 + s) : l + s - l * s,
				t1 = 2 * l - t2,
				c = [];
			for (var i = 0; i < 3; i++) {
				var t3 = t3s[i];
				if (t3 < 0) t3 += 1;
				if (t3 > 1) t3 -= 1;
				c[i] = 6 * t3 < 1
					? t1 + (t2 - t1) * 6 * t3
					: 2 * t3 < 1
						? t2
						: 3 * t3 < 2
							? t1 + (t2 - t1) * ((2 / 3) - t3) * 6
							: t1;
			}
			return new RGBColor(c[0], c[1], c[2], color._alpha);
		},

		'rgb-gray': function(color) {
			return new GrayColor(1 - (color._red * 0.2989 + color._green * 0.587
					+ color._blue * 0.114), color._alpha);
		},

		'gray-rgb': function(color) {
			var comp = 1 - color._gray;
			return new RGBColor(comp, comp, comp, color._alpha);
		},

		'gray-hsb': function(color) {
			return new HSBColor(0, 0, 1 - color._gray, color._alpha);
		},

		'gray-hsl': function(color) {
			return new HSLColor(0, 0, 1 - color._gray, color._alpha);
		}
	};

	var fields = {
		_readNull: true,

		initialize: function(arg) {
			var isArray = Array.isArray(arg),
				type = this._colorType;
			if (typeof arg === 'object' && !isArray) {
				if (!type) {
					return arg.red !== undefined
						? new RGBColor(arg.red, arg.green, arg.blue, arg.alpha)
						: arg.gray !== undefined
						? new GrayColor(arg.gray, arg.alpha)
						: arg.lightness !== undefined
						? new HSLColor(arg.hue, arg.saturation, arg.lightness,
								arg.alpha)
						: arg.hue !== undefined
						? new HSBColor(arg.hue, arg.saturation, arg.brightness,
								arg.alpha)
						: new RGBColor(); 
				} else {
					return Color.read(arguments).convert(type);
				}
			} else if (typeof arg === 'string') {
				var rgbColor = arg.match(/^#[0-9a-f]{3,6}$/i)
						? hexToRGBColor(arg)
						: nameToRGBColor(arg);
				return type
						? rgbColor.convert(type)
						: rgbColor;
			} else {
				var components = isArray ? arg
						: Array.prototype.slice.call(arguments);
				if (!type) {
					if (components.length >= 3)
						return new RGBColor(components);
					return new GrayColor(components);
				} else {
					Base.each(this._components,
						function(name, i) {
							var value = components[i];
							this['_' + name] = value !== undefined
									? value : null;
						},
					this);
				}
			}
		},

		clone: function() {
			var ctor = this.constructor,
				copy = new ctor(ctor.dont),
				components = this._components;
			for (var i = 0, l = components.length; i < l; i++) {
				var key = '_' + components[i];
				copy[key] = this[key];
			}
			return copy;
		},

		convert: function(type) {
			var converter;
			return this._colorType == type
					? this.clone()
					: (converter = converters[this._colorType + '-' + type])
						? converter(this)
						: converters['rgb-' + type](
								converters[this._colorType + '-rgb'](this));
		},

		statics: {
			extend: function(src) {
				src.beans = true;
				if (src._colorType) {
					var comps = components[src._colorType];
					src._components = comps.concat(['alpha']);
					Base.each(comps, function(name) {
						var isHue = name === 'hue',
							part = Base.capitalize(name),
							name = '_' + name;
						this['get' + part] = function() {
							return this[name];
						};
						this['set' + part] = function(value) {
							this[name] = isHue
								? ((value % 360) + 360) % 360
								: Math.min(Math.max(value, 0), 1);
							this._changed();
							return this;
						};
					}, src);
				}
				return this.base(src);
			}
		}
	};

	Base.each(components, function(comps, type) {
		Base.each(comps, function(component) {
			var part = Base.capitalize(component);
			fields['get' + part] = function() {
				return this.convert(type)[component];
			};
			fields['set' + part] = function(value) {
				var color = this.convert(type);
				color[component] = value;
				color = color.convert(this._colorType);
				for (var i = 0, l = this._components.length; i < l; i++) {
					var key = this._components[i];
					this[key] = color[key];
				}
			};
		});
	});

	return fields;
}, {

	_changed: function() {
		this._cssString = null;
		for (var i = 0, l = this._owners && this._owners.length; i < l; i++)
			this._owners[i]._changed(Change.STYLE);
	},

	_addOwner: function(item) {
		if (!this._owners)
			this._owners = [];
		this._owners.push(item);
	},

	_removeOwner: function(item) {
		var index = this._owners ? this._owners.indexOf(item) : -1;
		if (index != -1) {
			this._owners.splice(index, 1);
			if (this._owners.length == 0)
				delete this._owners;
		}
	},

	getType: function() {
		return this._colorType;
	},

	getComponents: function() {
		var length = this._components.length;
		var comps = new Array(length);
		for (var i = 0; i < length; i++)
			comps[i] = this['_' + this._components[i]];
		return comps;
	},

	getAlpha: function() {
		return this._alpha != null ? this._alpha : 1;
	},

	setAlpha: function(alpha) {
		this._alpha = alpha == null ? null : Math.min(Math.max(alpha, 0), 1);
		this._changed();
		return this;
	},

	hasAlpha: function() {
		return this._alpha != null;
	},

	equals: function(color) {
		if (color && color._colorType === this._colorType) {
			for (var i = 0, l = this._components.length; i < l; i++) {
				var component = '_' + this._components[i];
				if (this[component] !== color[component])
					return false;
			}
			return true;
		}
		return false;
	},

	toString: function() {
		var parts = [],
			format = Base.formatNumber;
		for (var i = 0, l = this._components.length; i < l; i++) {
			var component = this._components[i],
				value = this['_' + component];
			if (component === 'alpha' && value == null)
				value = 1;
			parts.push(component + ': ' + format(value));
		}
		return '{ ' + parts.join(', ') + ' }';
	},

	toCssString: function() {
		if (!this._cssString) {
			var color = this.convert('rgb'),
				alpha = color.getAlpha(),
				components = [
					Math.round(color._red * 255),
					Math.round(color._green * 255),
					Math.round(color._blue * 255),
					alpha != null ? alpha : 1
				];
			this._cssString = 'rgba(' + components.join(', ') + ')';
		}
		return this._cssString;
	},

	getCanvasStyle: function() {
		return this.toCssString();
	}

});

var GrayColor = this.GrayColor = Color.extend({

	_colorType: 'gray'
});

var RGBColor = this.RGBColor = Color.extend({

	_colorType: 'rgb'
});

var HSBColor = this.HSBColor = Color.extend({

	_colorType: 'hsb'
});

var HSLColor = this.HSLColor = Color.extend({

	_colorType: 'hsl'
});

var GradientColor = this.GradientColor = Color.extend({

	initialize: function(gradient, origin, destination, hilite) {
		this.gradient = gradient || new Gradient();
		this.setOrigin(origin);
		this.setDestination(destination);
		if (hilite)
			this.setHilite(hilite);
	},

	clone: function() {
		return new GradientColor(this.gradient, this._origin, this._destination,
				this._hilite);
	},

	getOrigin: function() {
		return this._origin;
	},

	setOrigin: function(origin) {
		origin = Point.read(arguments).clone();
		this._origin = origin;
		if (this._destination)
			this._radius = this._destination.getDistance(this._origin);
		this._changed();
		return this;
	},

	getDestination: function() {
		return this._destination;
	},

	setDestination: function(destination) {
		destination = Point.read(arguments).clone();
		this._destination = destination;
		this._radius = this._destination.getDistance(this._origin);
		this._changed();
		return this;
	},

	getHilite: function() {
		return this._hilite;
	},

	setHilite: function(hilite) {
		hilite = Point.read(arguments).clone();
		var vector = hilite.subtract(this._origin);
		if (vector.getLength() > this._radius) {
			this._hilite = this._origin.add(
					vector.normalize(this._radius - 0.1));
		} else {
			this._hilite = hilite;
		}
		this._changed();
		return this;
	},

	getCanvasStyle: function(ctx) {
		var gradient;
		if (this.gradient.type === 'linear') {
			gradient = ctx.createLinearGradient(this._origin.x, this._origin.y,
					this._destination.x, this._destination.y);
		} else {
			var origin = this._hilite || this._origin;
			gradient = ctx.createRadialGradient(origin.x, origin.y,
					0, this._origin.x, this._origin.y, this._radius);
		}
		for (var i = 0, l = this.gradient._stops.length; i < l; i++) {
			var stop = this.gradient._stops[i];
			gradient.addColorStop(stop._rampPoint, stop._color.toCssString());
		}
		return gradient;
	},

	equals: function(color) {
		return color == this || color && color._colorType === this._colorType
				&& this.gradient.equals(color.gradient)
				&& this._origin.equals(color._origin)
				&& this._destination.equals(color._destination);
	},

	transform: function(matrix) {
		matrix._transformPoint(this._origin, this._origin, true);
		matrix._transformPoint(this._destination, this._destination, true);
		if (this._hilite)
			matrix._transformPoint(this._hilite, this._hilite, true);
		this._radius = this._destination.getDistance(this._origin);
	}
});

var Gradient = this.Gradient = Base.extend({
	initialize: function(stops, type) {
		this.setStops(stops || ['white', 'black']);
		this.type = type || 'linear';
	},

	clone: function() {
		var stops = [];
		for (var i = 0, l = this._stops.length; i < l; i++)
			stops[i] = this._stops[i].clone();
		return new Gradient(stops, this.type);
	},

	getStops: function() {
		return this._stops;
	},

	setStops: function(stops) {
		if (stops.length < 2)
			throw new Error(
					'Gradient stop list needs to contain at least two stops.');
		this._stops = GradientStop.readAll(stops);
		for (var i = 0, l = this._stops.length; i < l; i++) {
			var stop = this._stops[i];
			if (stop._defaultRamp)
				stop.setRampPoint(i / (l - 1));
		}
	},

	equals: function(gradient) {
		if (gradient.type != this.type)
			return false;
		if (this._stops.length == gradient._stops.length) {
			for (var i = 0, l = this._stops.length; i < l; i++) {
				if (!this._stops[i].equals(gradient._stops[i]))
					return false;
			}
			return true;
		}
		return false;
	}
});

var GradientStop = this.GradientStop = Base.extend({
	initialize: function(arg0, arg1) {
		if (arg1 === undefined && Array.isArray(arg0)) {
			this.setColor(arg0[0]);
			this.setRampPoint(arg0[1]);
		} else if (arg0.color) {
			this.setColor(arg0.color);
			this.setRampPoint(arg0.rampPoint);
		} else {
			this.setColor(arg0);
			this.setRampPoint(arg1);
		}
	},

	clone: function() {
		return new GradientStop(this._color.clone(), this._rampPoint);
	},

	getRampPoint: function() {
		return this._rampPoint;
	},

	setRampPoint: function(rampPoint) {
		this._defaultRamp = rampPoint == null;
		this._rampPoint = rampPoint || 0;
	},

	getColor: function() {
		return this._color;
	},

	setColor: function(color) {
		this._color = Color.read(arguments);
	},

	equals: function(stop) {
		return stop == this || stop instanceof GradientStop
				&& this._color.equals(stop._color)
				&& this._rampPoint == stop._rampPoint;
	}
});

var DomElement = {
	getBounds: function(el, viewport) {
		var rect = el.getBoundingClientRect(),
			doc = el.ownerDocument,
			body = doc.body,
			docEl = doc.documentElement,
			x = rect.left - (docEl.clientLeft || body.clientLeft || 0),
			y = rect.top - (docEl.clientTop  || body.clientTop  || 0);
		if (!viewport) {
			var win = DomElement.getViewport(doc);
			x += win.pageXOffset || docEl.scrollLeft || body.scrollLeft;
			y += win.pageYOffset || docEl.scrollTop || body.scrollTop;
		}
		return new Rectangle(x, y, rect.width, rect.height);
	},

	getOffset: function(el, viewport) {
		return this.getBounds(el, viewport).getPoint();
	},

	getSize: function(el) {
		return this.getBounds(el, true).getSize();
	},

	isInvisible: function(el) {
		return this.getSize(el).equals([0, 0]);
	},

	isVisible: function(el) {
		return !this.isInvisible(el) && this.getViewportBounds(el).intersects(
				this.getBounds(el, true));
	},

	getViewport: function(doc) {
		return doc.defaultView || doc.parentWindow;
	},

	getViewportBounds: function(el) {
		var doc = el.ownerDocument,
			view = this.getViewport(doc),
			body = doc.getElementsByTagName(
				doc.compatMode === 'CSS1Compat' ? 'html' : 'body')[0];
		return Rectangle.create(0, 0, 
			view.innerWidth || body.clientWidth,
			view.innerHeight || body.clientHeight
		);
	},

	getComputedStyle: function(el, name) {
		if (el.currentStyle)
			return el.currentStyle[Base.camelize(name)];
		var style = this.getViewport(el.ownerDocument)
				.getComputedStyle(el, null);
		return style ? style.getPropertyValue(Base.hyphenate(name)) : null;
	}
};

var DomEvent = {
	add: function(el, events) {
		for (var type in events) {
			var func = events[type];
			if (el.addEventListener) {
				el.addEventListener(type, func, false);
			} else if (el.attachEvent) {
				el.attachEvent('on' + type, func.bound = function() {
					func.call(el, window.event);
				});
			}
		}
	},

	remove: function(el, events) {
		for (var type in events) {
			var func = events[type];
			if (el.removeEventListener) {
				el.removeEventListener(type, func, false);
			} else if (el.detachEvent) {
				el.detachEvent('on' + type, func.bound);
			}
		}
	},

	getPoint: function(event) {
		var pos = event.targetTouches
				? event.targetTouches.length
					? event.targetTouches[0]
					: event.changedTouches[0]
				: event;
		return Point.create(
			pos.pageX || pos.clientX + document.documentElement.scrollLeft,
			pos.pageY || pos.clientY + document.documentElement.scrollTop
		);
	},

	getTarget: function(event) {
		return event.target || event.srcElement;
	},

	getOffset: function(event, target) {
		return DomEvent.getPoint(event).subtract(DomElement.getOffset(
				target || DomEvent.getTarget(event)));
	},

	preventDefault: function(event) {
		if (event.preventDefault) {
			event.preventDefault();
		} else {
			event.returnValue = false;
		}
	},

	stopPropagation: function(event) {
		if (event.stopPropagation) {
			event.stopPropagation();
		} else {
			event.cancelBubble = true;
		}
	},

	stop: function(event) {
		DomEvent.stopPropagation(event);
		DomEvent.preventDefault(event);
	}
};

DomEvent.requestAnimationFrame = new function() {
	var part = 'equestAnimationFrame',
		request = window['r' + part] || window['webkitR' + part]
			|| window['mozR' + part] || window['oR' + part]
			|| window['msR' + part];
	if (request) {
		request(function(time) {
			if (time == undefined)
				request = null;
		});
	}

	var callbacks = [],
		focused = true,
		timer;

	DomEvent.add(window, {
		focus: function() {
			focused = true;
		},
		blur: function() {
			focused = false;
		}
	});

	return function(callback, element) {
		if (request)
			return request(callback, element);
		callbacks.push([callback, element]);
		if (timer)
			return;
		timer = window.setInterval(function() {
			for (var i = callbacks.length - 1; i >= 0; i--) {
				var entry = callbacks[i],
					func = entry[0],
					el = entry[1];
				if (!el || (PaperScript.getAttribute(el, 'keepalive') == 'true'
						|| focused) && DomElement.isVisible(el)) {
					callbacks.splice(i, 1);
					func(Date.now());
				}
			}
		}, 1000 / 60);
	};
};

var View = this.View = PaperScopeItem.extend({
	_list: 'views',
	_reference: 'view',

	initialize: function(canvas) {
		this.base();
		var size;

		if (typeof canvas === 'string')
			canvas = document.getElementById(canvas);
		if (canvas instanceof HTMLCanvasElement) {
			this._canvas = canvas;
			if (PaperScript.hasAttribute(canvas, 'resize')) {
				var offset = DomElement.getOffset(canvas, true),
					that = this;
				size = DomElement.getViewportBounds(canvas)
						.getSize().subtract(offset);
				canvas.width = size.width;
				canvas.height = size.height;
				DomEvent.add(window, {
					resize: function(event) {
						if (!DomElement.isInvisible(canvas))
							offset = DomElement.getOffset(canvas, true);
						that.setViewSize(DomElement.getViewportBounds(canvas)
								.getSize().subtract(offset));
					}
				});
			} else {
				size = DomElement.isInvisible(canvas)
					? Size.create(parseInt(canvas.getAttribute('width')),
							parseInt(canvas.getAttribute('height')))
					: DomElement.getSize(canvas);
			}
			if (PaperScript.hasAttribute(canvas, 'stats')) {
				this._stats = new Stats();
				var element = this._stats.domElement,
					style = element.style,
					offset = DomElement.getOffset(canvas);
				style.position = 'absolute';
				style.left = offset.x + 'px';
				style.top = offset.y + 'px';
				document.body.appendChild(element);
			}
		} else {
			size = Size.read(arguments, 1);
			if (size.isZero())
				size = new Size(1024, 768);
			this._canvas = CanvasProvider.getCanvas(size);
		}
		this._id = this._canvas.getAttribute('id');
		if (this._id == null)
			this._canvas.setAttribute('id', this._id = 'canvas-' + View._id++);

		View._views[this._id] = this;
		this._viewSize = LinkedSize.create(this, 'setViewSize',
				size.width, size.height);
		this._context = this._canvas.getContext('2d');
		this._matrix = new Matrix();
		this._zoom = 1;

		this._events = this._createEvents();
		DomEvent.add(this._canvas, this._events);
		if (!View._focused)
			View._focused = this;

		this._scope._redrawNotified = false;
	},

	remove: function() {
		if (!this.base())
			return false;
		if (View._focused == this)
			View._focused = null;
		delete View._views[this._id];
		DomEvent.remove(this._canvas, this._events);
		this._canvas = this._events = this._onFrame = null;
		return true;
	},

	_redraw: function() {
		this._redrawNeeded = true;
		if (this._onFrameCallback) {
			this._onFrameCallback(0, true);
		} else {
			this.draw();
		}
	},

	_transform: function(matrix, flags) {
		this._matrix.preConcatenate(matrix);
		this._bounds = null;
		this._inverse = null;
		this._redraw();
	},

	getCanvas: function() {
		return this._canvas;
	},

	getViewSize: function() {
		return this._viewSize;
	},

	setViewSize: function(size) {
		size = Size.read(arguments);
		var delta = size.subtract(this._viewSize);
		if (delta.isZero())
			return;
		this._canvas.width = size.width;
		this._canvas.height = size.height;
		this._viewSize.set(size.width, size.height, true);
		this._bounds = null;
		this._redrawNeeded = true;
		if (this.onResize) {
			this.onResize({
				size: size,
				delta: delta
			});
		}
		this._redraw();
	},

	getBounds: function() {
		if (!this._bounds)
			this._bounds = this._getInverse()._transformBounds(
					new Rectangle(new Point(), this._viewSize));
		return this._bounds;
	},

	getSize: function() {
		return this.getBounds().getSize();
	},

	getCenter: function() {
		return this.getBounds().getCenter();
	},

	setCenter: function(center) {
		this.scrollBy(Point.read(arguments).subtract(this.getCenter()));
	},

	getZoom: function() {
		return this._zoom;
	},

	setZoom: function(zoom) {
		this._transform(new Matrix().scale(zoom / this._zoom, this.getCenter()));
		this._zoom = zoom;
	},

	isVisible: function() {
		return DomElement.isVisible(this._canvas);
	},

	scrollBy: function(point) {
		this._transform(new Matrix().translate(Point.read(arguments).negate()));
	},

	draw: function(checkRedraw) {
		if (checkRedraw && !this._redrawNeeded)
			return false;
		if (this._stats)
			this._stats.update();
		var ctx = this._context,
			size = this._viewSize;
		ctx.clearRect(0, 0, size._width + 1, size._height + 1);

		ctx.save();
		this._matrix.applyToContext(ctx);
		this._scope.project.draw(ctx);
		ctx.restore();
		if (this._redrawNeeded) {
			this._redrawNeeded = false;
			this._scope._redrawNotified = false;
		}
		return true;
	},

	projectToView: function(point) {
		return this._matrix._transformPoint(Point.read(arguments));
	},

	viewToProject: function(point) {
		return this._getInverse()._transformPoint(Point.read(arguments));
	},

	_getInverse: function() {
		if (!this._inverse)
			this._inverse = this._matrix.createInverse();
		return this._inverse;
	},

	getOnFrame: function() {
		return this._onFrame;
	},

	setOnFrame: function(onFrame) {
		this._onFrame = onFrame;
		if (!onFrame) {
			delete this._onFrameCallback;
			return;
		}
		var that = this,
			requested = false,
			before,
			time = 0,
			count = 0;
		this._onFrameCallback = function(param, dontRequest) {
			requested = false;
			if (!that._onFrame)
				return;
			paper = that._scope;
			requested = true;
			if (!dontRequest) {
				DomEvent.requestAnimationFrame(that._onFrameCallback,
						that._canvas);
			}
			var now = Date.now() / 1000,
			 	delta = before ? now - before : 0;
			that._onFrame(Base.merge({
				delta: delta, 
				time: time += delta, 
				count: count++
			}));
			before = now;
			that.draw(true);
		};
		if (!requested)
			this._onFrameCallback();
	},

	onResize: null
}, {
	statics: {
		_views: {},
		_id: 0
	}
}, new function() {
	var tool,
		timer,
		curPoint,
		tempFocus,
		dragging = false;

	function viewToProject(view, event) {
		return view.viewToProject(DomEvent.getOffset(event, view._canvas));
	}

	function updateFocus() {
		if (!View._focused || !View._focused.isVisible()) {
			PaperScope.each(function(scope) {
				for (var i = 0, l = scope.views.length; i < l; i++) {
					var view = scope.views[i];
					if (view.isVisible()) {
						View._focused = tempFocus = view;
						throw Base.stop;
					}
				}
			});
		}
	}

	function mousemove(event) {
		var view;
		if (!dragging) {
		 	view = View._views[DomEvent.getTarget(event).getAttribute('id')];
			if (view) {
				View._focused = tempFocus = view;
			} else if (tempFocus && tempFocus == View._focused) {
				View._focused = null;
				updateFocus();
			}
		}
		if (!(view = view || View._focused) || !(tool = view._scope.tool))
			return;
		var point = event && viewToProject(view, event);
		var onlyMove = !!(!tool.onMouseDrag && tool.onMouseMove);
		if (dragging && !onlyMove) {
			curPoint = point || curPoint;
			if (curPoint && tool.onHandleEvent('mousedrag', curPoint, event)) {
				view.draw(true);
				DomEvent.stop(event);
			}
		} else if ((!dragging || onlyMove)
				&& tool.onHandleEvent('mousemove', point, event)) {
			view.draw(true);
			DomEvent.stop(event);
		}
	}

	function mouseup(event) {
		var view = View._focused;
		if (!view || !dragging)
			return;
		dragging = false;
		curPoint = null;
		if (tool) {
			if (timer != null)
				timer = clearInterval(timer);
			if (tool.onHandleEvent('mouseup', viewToProject(view, event), event)) {
				view.draw(true);
				DomEvent.stop(event);
			}
		}
	}

	function selectstart(event) {
		if (dragging)
			DomEvent.stop(event);
	}

	DomEvent.add(document, {
		mousemove: mousemove,
		mouseup: mouseup,
		touchmove: mousemove,
		touchend: mouseup,
		selectstart: selectstart,
		scroll: updateFocus
	});

	DomEvent.add(window, {
		load: updateFocus
	});

	return {
		_createEvents: function() {
			var view = this;

			function mousedown(event) {
				View._focused = view;
				if (!(tool = view._scope.tool))
					return;
				curPoint = viewToProject(view, event);
				if (tool.onHandleEvent('mousedown', curPoint, event))
					view.draw(true);
				if (tool.eventInterval != null)
					timer = setInterval(mousemove, tool.eventInterval);
				dragging = true;
			}

			return {
				mousedown: mousedown,
				touchstart: mousedown,
				selectstart: selectstart
			};
		},

		statics: {

			updateFocus: updateFocus
		}
	};
});

var Event = this.Event = Base.extend({
	initialize: function(event) {
		this.event = event;
	},

	preventDefault: function() {
		DomEvent.preventDefault(this.event);
	},

	stopPropagation: function() {
		DomEvent.stopPropagation(this.event);
	},

	stop: function() {
		DomEvent.stop(this.event);
	},

	getModifiers: function() {
		return Key.modifiers;
	}
});

var KeyEvent = this.KeyEvent = Event.extend(new function() {
	return {
		initialize: function(down, key, character, event) {
			this.base(event);
			this.type = down ? 'keydown' : 'keyup';
			this.key = key;
			this.character = character;
		},

		toString: function() {
			return '{ type: ' + this.type
					+ ', key: ' + this.key
					+ ', character: ' + this.character
					+ ', modifiers: ' + this.getModifiers()
					+ ' }';
		}
	};
});

var Key = this.Key = new function() {

	var keys = {
		 8: 'backspace',
		13: 'enter',
		16: 'shift',
		17: 'control',
		18: 'option',
		19: 'pause',
		20: 'caps-lock',
		27: 'escape',
		32: 'space',
		35: 'end',
		36: 'home',
		37: 'left',
		38: 'up',
		39: 'right',
		40: 'down',
		46: 'delete',
		91: 'command',
		93: 'command', 
		224: 'command'  
	},

	modifiers = Base.merge({
		shift: false,
		control: false,
		option: false,
		command: false,
		capsLock: false
	}),

	charCodeMap = {}, 
	keyMap = {}, 
	downCode; 

	function handleKey(down, keyCode, charCode, event) {
		var character = String.fromCharCode(charCode),
			key = keys[keyCode] || character.toLowerCase(),
			handler = down ? 'onKeyDown' : 'onKeyUp',
			view = View._focused,
			scope = view && view.isVisible() && view._scope,
			tool = scope && scope.tool;
		keyMap[key] = down;
		if (tool && tool[handler]) {
			var keyEvent = new KeyEvent(down, key, character, event);
			if (tool[handler](keyEvent) === false)
				keyEvent.preventDefault();
			if (view)
				view.draw(true);
		}
	}

	DomEvent.add(document, {
		keydown: function(event) {
			var code = event.which || event.keyCode;
			var key = keys[code], name;
			if (key) {
				if (modifiers[name = Base.camelize(key)] !== undefined) {
					modifiers[name] = true;
				} else {
					charCodeMap[code] = 0;
					handleKey(true, code, null, event);
				}
			} else {
				downCode = code;
			}
		},

		keypress: function(event) {
			if (downCode != null) {
				var code = event.which || event.keyCode;
				charCodeMap[downCode] = code;
				handleKey(true, downCode, code, event);
				downCode = null;
			}
		},

		keyup: function(event) {
			var code = event.which || event.keyCode,
				key = keys[code], name;
			if (key && modifiers[name = Base.camelize(key)] !== undefined) {
				modifiers[name] = false;
			} else if (charCodeMap[code] != null) {
				handleKey(false, code, charCodeMap[code], event);
				delete charCodeMap[code];
			}
		}
	});

	return {
		modifiers: modifiers,

		isDown: function(key) {
			return !!keyMap[key];
		}
	};
};

var ToolEvent = this.ToolEvent = Event.extend({
	initialize: function(tool, type, event) {
		this.tool = tool;
		this.type = type;
		this.event = event;
	},

	_choosePoint: function(point, toolPoint) {
		return point ? point : toolPoint ? toolPoint.clone() : null;
	},

	getPoint: function() {
		return this._choosePoint(this._point, this.tool._point);
	},

	setPoint: function(point) {
		this._point = point;
	},

	getLastPoint: function() {
		return this._choosePoint(this._lastPoint, this.tool._lastPoint);
	},

	setLastPoint: function(lastPoint) {
		this._lastPoint = lastPoint;
	},

	getDownPoint: function() {
		return this._choosePoint(this._downPoint, this.tool._downPoint);
	},

	setDownPoint: function(downPoint) {
		this._downPoint = downPoint;
	},

	getMiddlePoint: function() {
		if (!this._middlePoint && this.tool._lastPoint) {
			return this.tool._point.add(this.tool._lastPoint).divide(2);
		}
		return this.middlePoint;
	},

	setMiddlePoint: function(middlePoint) {
		this._middlePoint = middlePoint;
	},

	getDelta: function() {
		return !this._delta && this.tool._lastPoint
		 		? this.tool._point.subtract(this.tool._lastPoint)
				: this._delta;
	},

	setDelta: function(delta) {
		this._delta = delta;
	},

	getCount: function() {
		return /^mouse(down|up)$/.test(this.type)
				? this.tool._downCount
				: this.tool._count;
	},

	setCount: function(count) {
		this.tool[/^mouse(down|up)$/.test(this.type) ? 'downCount' : 'count']
			= count;
	},

	getItem: function() {
		if (!this._item) {
			var result = this.tool._scope.project.hitTest(this.getPoint());
			if (result) {
				var item = result.item,
					parent = item._parent;
				while ((parent instanceof Group && !(parent instanceof Layer))
						|| parent instanceof CompoundPath) {
					item = parent;
					parent = parent._parent;
				}
				this._item = item;
			}
		}
		return this._item;
	},
	setItem: function(item) {
		this._item = item;
	},

	toString: function() {
		return '{ type: ' + this.type
				+ ', point: ' + this.getPoint()
				+ ', count: ' + this.getCount()
				+ ', modifiers: ' + this.getModifiers()
				+ ' }';
	}
});

var Tool = this.Tool = PaperScopeItem.extend({
	_list: 'tools',
	_reference: 'tool',

	initialize: function() {
		this.base();
		this._firstMove = true;
		this._count = 0;
		this._downCount = 0;
	},

	eventInterval: null,

	getMinDistance: function() {
		return this._minDistance;
	},

	setMinDistance: function(minDistance) {
		this._minDistance = minDistance;
		if (this._minDistance != null && this._maxDistance != null
				&& this._minDistance > this._maxDistance) {
			this._maxDistance = this._minDistance;
		}
	},

	getMaxDistance: function() {
		return this._maxDistance;
	},

	setMaxDistance: function(maxDistance) {
		this._maxDistance = maxDistance;
		if (this._minDistance != null && this._maxDistance != null
				&& this._maxDistance < this._minDistance) {
			this._minDistance = maxDistance;
		}
	},

	getFixedDistance: function() {
		return this._minDistance == this._maxDistance
			? this._minDistance : null;
	},

	setFixedDistance: function(distance) {
		this._minDistance = distance;
		this._maxDistance = distance;
	},

	updateEvent: function(type, pt, minDistance, maxDistance, start,
			needsChange, matchMaxDistance) {
		if (!start) {
			if (minDistance != null || maxDistance != null) {
				var minDist = minDistance != null ? minDistance : 0;
				var vector = pt.subtract(this._point);
				var distance = vector.getLength();
				if (distance < minDist)
					return false;
				var maxDist = maxDistance != null ? maxDistance : 0;
				if (maxDist != 0) {
					if (distance > maxDist) {
						pt = this._point.add(vector.normalize(maxDist));
					} else if (matchMaxDistance) {
						return false;
					}
				}
			}
			if (needsChange && pt.equals(this._point))
				return false;
		}
		this._lastPoint = start && type == 'mousemove' ? pt : this._point;
		this._point = pt;
		switch (type) {
		case 'mousedown':
			this._lastPoint = this._downPoint;
			this._downPoint = this._point;
			this._downCount++;
			break;
		case 'mouseup':
			this._lastPoint = this._downPoint;
			break;
		}
		this._count = start ? 0 : this._count + 1;
		return true;
	},

	onHandleEvent: function(type, pt, event) {
		paper = this._scope;
		var called = false;
		switch (type) {
		case 'mousedown':
			this.updateEvent(type, pt, null, null, true, false, false);
			if (this.onMouseDown) {
				this.onMouseDown(new ToolEvent(this, type, event));
				called = true;
			}
			break;
		case 'mousedrag':
			var needsChange = false,
				matchMaxDistance = false;
			while (this.updateEvent(type, pt, this.minDistance,
					this.maxDistance, false, needsChange, matchMaxDistance)) {
				if (this.onMouseDrag) {
					this.onMouseDrag(new ToolEvent(this, type, event));
					called = true;
				}
				needsChange = true;
				matchMaxDistance = true;
			}
			break;
		case 'mouseup':
			if ((this._point.x != pt.x || this._point.y != pt.y)
					&& this.updateEvent('mousedrag', pt, this.minDistance,
							this.maxDistance, false, false, false)) {
				if (this.onMouseDrag) {
					this.onMouseDrag(new ToolEvent(this, type, event));
					called = true;
				}
			}
			this.updateEvent(type, pt, null, this.maxDistance, false,
					false, false);
			if (this.onMouseUp) {
				this.onMouseUp(new ToolEvent(this, type, event));
				called = true;
			}
			this.updateEvent(type, pt, null, null, true, false, false);
			this._firstMove = true;
			break;
		case 'mousemove':
			while (this.updateEvent(type, pt, this.minDistance,
					this.maxDistance, this._firstMove, true, false)) {
				if (this.onMouseMove) {
					this.onMouseMove(new ToolEvent(this, type, event));
					called = true;
				}
				this._firstMove = false;
			}
			break;
		}
		return called;
	}
});

var CanvasProvider = {
	canvases: [],
	getCanvas: function(size) {
		if (this.canvases.length) {
			var canvas = this.canvases.pop();
			if ((canvas.width != size.width)
					|| (canvas.height != size.height)) {
				canvas.width = size.width;
				canvas.height = size.height;
			} else {
				canvas.getContext('2d').clearRect(0, 0,
						size.width + 1, size.height + 1);
			}
			return canvas;
		} else {
			var canvas = document.createElement('canvas');
			canvas.width = size.width;
			canvas.height = size.height;
			return canvas;
		}
	},

	returnCanvas: function(canvas) {
		this.canvases.push(canvas);
	}
};

var Numerical = new function() {

	var abscissas = [
		[  0.5773502691896257645091488],
		[0,0.7745966692414833770358531],
		[  0.3399810435848562648026658,0.8611363115940525752239465],
		[0,0.5384693101056830910363144,0.9061798459386639927976269],
		[  0.2386191860831969086305017,0.6612093864662645136613996,0.9324695142031520278123016],
		[0,0.4058451513773971669066064,0.7415311855993944398638648,0.9491079123427585245261897],
		[  0.1834346424956498049394761,0.5255324099163289858177390,0.7966664774136267395915539,0.9602898564975362316835609],
		[0,0.3242534234038089290385380,0.6133714327005903973087020,0.8360311073266357942994298,0.9681602395076260898355762],
		[  0.1488743389816312108848260,0.4333953941292471907992659,0.6794095682990244062343274,0.8650633666889845107320967,0.9739065285171717200779640],
		[0,0.2695431559523449723315320,0.5190961292068118159257257,0.7301520055740493240934163,0.8870625997680952990751578,0.9782286581460569928039380],
		[  0.1252334085114689154724414,0.3678314989981801937526915,0.5873179542866174472967024,0.7699026741943046870368938,0.9041172563704748566784659,0.9815606342467192506905491],
		[0,0.2304583159551347940655281,0.4484927510364468528779129,0.6423493394403402206439846,0.8015780907333099127942065,0.9175983992229779652065478,0.9841830547185881494728294],
		[  0.1080549487073436620662447,0.3191123689278897604356718,0.5152486363581540919652907,0.6872929048116854701480198,0.8272013150697649931897947,0.9284348836635735173363911,0.9862838086968123388415973],
		[0,0.2011940939974345223006283,0.3941513470775633698972074,0.5709721726085388475372267,0.7244177313601700474161861,0.8482065834104272162006483,0.9372733924007059043077589,0.9879925180204854284895657],
		[  0.0950125098376374401853193,0.2816035507792589132304605,0.4580167776572273863424194,0.6178762444026437484466718,0.7554044083550030338951012,0.8656312023878317438804679,0.9445750230732325760779884,0.9894009349916499325961542]
	];

	var weights = [
		[1],
		[0.8888888888888888888888889,0.5555555555555555555555556],
		[0.6521451548625461426269361,0.3478548451374538573730639],
		[0.5688888888888888888888889,0.4786286704993664680412915,0.2369268850561890875142640],
		[0.4679139345726910473898703,0.3607615730481386075698335,0.1713244923791703450402961],
		[0.4179591836734693877551020,0.3818300505051189449503698,0.2797053914892766679014678,0.1294849661688696932706114],
		[0.3626837833783619829651504,0.3137066458778872873379622,0.2223810344533744705443560,0.1012285362903762591525314],
		[0.3302393550012597631645251,0.3123470770400028400686304,0.2606106964029354623187429,0.1806481606948574040584720,0.0812743883615744119718922],
		[0.2955242247147528701738930,0.2692667193099963550912269,0.2190863625159820439955349,0.1494513491505805931457763,0.0666713443086881375935688],
		[0.2729250867779006307144835,0.2628045445102466621806889,0.2331937645919904799185237,0.1862902109277342514260976,0.1255803694649046246346943,0.0556685671161736664827537],
		[0.2491470458134027850005624,0.2334925365383548087608499,0.2031674267230659217490645,0.1600783285433462263346525,0.1069393259953184309602547,0.0471753363865118271946160],
		[0.2325515532308739101945895,0.2262831802628972384120902,0.2078160475368885023125232,0.1781459807619457382800467,0.1388735102197872384636018,0.0921214998377284479144218,0.0404840047653158795200216],
		[0.2152638534631577901958764,0.2051984637212956039659241,0.1855383974779378137417166,0.1572031671581935345696019,0.1215185706879031846894148,0.0801580871597602098056333,0.0351194603317518630318329],
		[0.2025782419255612728806202,0.1984314853271115764561183,0.1861610000155622110268006,0.1662692058169939335532009,0.1395706779261543144478048,0.1071592204671719350118695,0.0703660474881081247092674,0.0307532419961172683546284],
		[0.1894506104550684962853967,0.1826034150449235888667637,0.1691565193950025381893121,0.1495959888165767320815017,0.1246289712555338720524763,0.0951585116824927848099251,0.0622535239386478928628438,0.0271524594117540948517806]
	];

	var abs = Math.abs,
		sqrt = Math.sqrt,
		cos = Math.cos,
		PI = Math.PI;

	return {
		TOLERANCE: 10e-6,
		EPSILON: 10e-12,

		integrate: function(f, a, b, n) {
			var x = abscissas[n - 2],
				w = weights[n - 2],
				A = 0.5 * (b - a),
				B = A + a,
				i = 0,
				m = (n + 1) >> 1,
				sum = n & 1 ? w[i++] * f(B) : 0; 
			while (i < m) {
				var Ax = A * x[i];
				sum += w[i++] * (f(B + Ax) + f(B - Ax));
			}
			return A * sum;
		},

		findRoot: function(f, df, x, a, b, n, tolerance) {
			for (var i = 0; i < n; i++) {
				var fx = f(x),
					dx = fx / df(x);
				if (abs(dx) < tolerance)
					return x;
				var nx = x - dx;
				if (fx > 0) {
					b = x;
					x = nx <= a ? 0.5 * (a + b) : nx;
				} else {
					a = x;
					x = nx >= b ? 0.5 * (a + b) : nx;
				}
			}
		},

		solveQuadratic: function(a, b, c, roots, tolerance) {
			if (abs(a) < tolerance) {
				if (abs(b) >= tolerance) {
					roots[0] = -c / b;
					return 1;
				}
				if (abs(c) < tolerance)
					return -1; 
				return 0; 
			}
			var q = b * b - 4 * a * c;
			if (q < 0)
				return 0; 
			q = sqrt(q);
			if (b < 0)
				q = -q;
			q = (b + q) * -0.5;
			var n = 0;
			if (abs(q) >= tolerance)
				roots[n++] = c / q;
			if (abs(a) >= tolerance)
				roots[n++] = q / a;
			return n; 
		},

		solveCubic: function(a, b, c, d, roots, tolerance) {
			if (abs(a) < tolerance)
				return Numerical.solveQuadratic(b, c, d, roots, tolerance);
			b /= a;
			c /= a;
			d /= a;
			var Q = (b * b - 3 * c) / 9,
				R = (2 * b * b * b - 9 * b * c + 27 * d) / 54,
				Q3 = Q * Q * Q,
				R2 = R * R;
			b /= 3; 
			if (R2 < Q3) { 
				var theta = Math.acos(R / sqrt(Q3)),
					q = -2 * sqrt(Q);
				roots[0] = q * cos(theta / 3) - b;
				roots[1] = q * cos((theta + 2 * PI) / 3) - b;
				roots[2] = q * cos((theta - 2 * PI) / 3) - b;
				return 3;
			} else { 
				var A = -Math.pow(abs(R) + sqrt(R2 - Q3), 1 / 3);
				if (R < 0) A = -A;
				var B = (abs(A) < tolerance) ? 0 : Q / A;
				roots[0] = (A + B) - b;
				return 1;
			}
			return 0;
		}
	};
};

var BlendMode = {
	process: function(blendMode, srcContext, dstContext, alpha, offset) {
		var srcCanvas = srcContext.canvas,
			dstData = dstContext.getImageData(offset.x, offset.y,
					srcCanvas.width, srcCanvas.height),
			dst  = dstData.data,
			src  = srcContext.getImageData(0, 0,
					srcCanvas.width, srcCanvas.height).data,
			min = Math.min,
			max = Math.max,
			abs = Math.abs,
			sr, sg, sb, sa, 
			br, bg, bb, ba, 
			dr, dg, db;     

		function getLum(r, g, b) {
			return 0.2989 * r + 0.587 * g + 0.114 * b;
		}

		function setLum(r, g, b, l) {
			var d = l - getLum(r, g, b);
			dr = r + d;
			dg = g + d;
			db = b + d;
			var l = getLum(dr, dg, db),
				mn = min(dr, dg, db),
				mx = max(dr, dg, db);
			if (mn < 0) {
				var lmn = l - mn;
				dr = l + (dr - l) * l / lmn;
				dg = l + (dg - l) * l / lmn;
				db = l + (db - l) * l / lmn;
			}
			if (mx > 255) {
				var ln = 255 - l, mxl = mx - l;
				dr = l + (dr - l) * ln / mxl;
				dg = l + (dg - l) * ln / mxl;
				db = l + (db - l) * ln / mxl;
			}
		}

		function getSat(r, g, b) {
			return max(r, g, b) - min(r, g, b);
		}

		function setSat(r, g, b, s) {
			var col = [r, g, b],
				mx = max(r, g, b), 
				mn = min(r, g, b), 
				md; 
			mn = mn == r ? 0 : mn == g ? 1 : 2;
			mx = mx == r ? 0 : mx == g ? 1 : 2;
			md = min(mn, mx) == 0 ? max(mn, mx) == 1 ? 2 : 1 : 0;
			if (col[mx] > col[mn]) {
				col[md] = (col[md] - col[mn]) * s / (col[mx] - col[mn]);
				col[mx] = s;
			} else {
				col[md] = col[mx] = 0;
			}
			col[mn] = 0;
			dr = col[0];
			dg = col[1];
			db = col[2];
		}

		var modes = {
			multiply: function() {
				dr = br * sr / 255;
				dg = bg * sg / 255;
				db = bb * sb / 255;
			},

			screen: function() {
				dr = 255 - (255 - br) * (255 - sr) / 255;
				dg = 255 - (255 - bg) * (255 - sg) / 255;
				db = 255 - (255 - bb) * (255 - sb) / 255;
			},

			overlay: function() {
				dr = br < 128 ? 2 * br * sr / 255 : 255 - 2 * (255 - br) * (255 - sr) / 255;
				dg = bg < 128 ? 2 * bg * sg / 255 : 255 - 2 * (255 - bg) * (255 - sg) / 255;
				db = bb < 128 ? 2 * bb * sb / 255 : 255 - 2 * (255 - bb) * (255 - sb) / 255;
			},

			'soft-light': function() {
				var t = sr * br / 255;
				dr = t + br * (255 - (255 - br) * (255 - sr) / 255 - t) / 255;
				t = sg * bg / 255;
				dg = t + bg * (255 - (255 - bg) * (255 - sg) / 255 - t) / 255;
				t = sb * bb / 255;
				db = t + bb * (255 - (255 - bb) * (255 - sb) / 255 - t) / 255;
			},

			'hard-light': function() {
				dr = sr < 128 ? 2 * sr * br / 255 : 255 - 2 * (255 - sr) * (255 - br) / 255;
				dg = sg < 128 ? 2 * sg * bg / 255 : 255 - 2 * (255 - sg) * (255 - bg) / 255;
				db = sb < 128 ? 2 * sb * bb / 255 : 255 - 2 * (255 - sb) * (255 - bb) / 255;
			},

			'color-dodge': function() {
				dr = sr == 255 ? sr : min(255, br * 255 / (255 - sr));
				dg = sg == 255 ? sg : min(255, bg * 255 / (255 - sg));
				db = sb == 255 ? sb : min(255, bb * 255 / (255 - sb));
			},

			'color-burn': function() {
				dr = sr == 0 ? 0 : max(255 - ((255 - br) * 255) / sr, 0);
				dg = sg == 0 ? 0 : max(255 - ((255 - bg) * 255) / sg, 0);
				db = sb == 0 ? 0 : max(255 - ((255 - bb) * 255) / sb, 0);
			},

			darken: function() {
				dr = br < sr ? br : sr;
				dg = bg < sg ? bg : sg;
				db = bb < sb ? bb : sb;
			},

			lighten: function() {
				dr = br > sr ? br : sr;
				dg = bg > sg ? bg : sg;
				db = bb > sb ? bb : sb;
			},

			difference: function() {
				dr = br - sr;
				if (dr < 0)
					dr = -dr;
				dg = bg - sg;
				if (dg < 0)
					dg = -dg;
				db = bb - sb;
				if (db < 0)
					db = -db;
			},

			exclusion: function() {
				dr = br + sr * (255 - br - br) / 255;
				dg = bg + sg * (255 - bg - bg) / 255;
				db = bb + sb * (255 - bb - bb) / 255;
			},

			hue: function() {
				setSat(sr, sg, sb, getSat(br, bg, bb));
				setLum(dr, dg, db, getLum(br, bg, bb));
			},

			saturation: function() {
				setSat(br, bg, bb, getSat(sr, sg, sb));
				setLum(dr, dg, db, getLum(br, bg, bb));
			},

			luminosity: function() {
				setLum(br, bg, bb, getLum(sr, sg, sb));
			},

			color: function() {
				setLum(sr, sg, sb, getLum(br, bg, bb));
			},

			add: function() {
				dr = min(br + sr, 255);
				dg = min(bg + sg, 255);
				db = min(bb + sb, 255);
			},

			subtract: function() {
				dr = max(br - sr, 0);
				dg = max(bg - sg, 0);
				db = max(bb - sb, 0);
			},

			average: function() {
				dr = (br + sr) / 2;
				dg = (bg + sg) / 2;
				db = (bb + sb) / 2;
			},

			negation: function() {
				dr = 255 - abs(255 - sr - br);
				dg = 255 - abs(255 - sg - bg);
				db = 255 - abs(255 - sb - bb);
			}
		};

		var process = modes[blendMode];
		if (!process)
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			sr = src[i];
			br = dst[i];
			sg = src[i + 1];
			bg = dst[i + 1];
			sb = src[i + 2];
			bb = dst[i + 2];
			sa = src[i + 3];
			ba = dst[i + 3];
			process();
			var a1 = sa * alpha / 255,
				a2 = 1 - a1;
			dst[i] = a1 * dr + a2 * br;
			dst[i + 1] = a1 * dg + a2 * bg;
			dst[i + 2] = a1 * db + a2 * bb;
			dst[i + 3] = sa * alpha + a2 * ba;
		}
		dstContext.putImageData(dstData, offset.x, offset.y);
	}
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	// Math Operators

	var operators = {
		'+': 'add',
		'-': 'subtract',
		'*': 'multiply',
		'/': 'divide',
		'%': 'modulo',
		'==': 'equals',
		'!=': 'equals'
	};

	function $eval(left, operator, right) {
		var handler = operators[operator];
		if (left && left[handler]) {
			var res = left[handler](right);
			return operator == '!=' ? !res : res;
		}
		switch (operator) {
		case '+': return left + right;
		case '-': return left - right;
		case '*': return left * right;
		case '/': return left / right;
		case '%': return left % right;
		case '==': return left == right;
		case '!=': return left != right;
		default:
			throw new Error('Implement Operator: ' + operator);
		}
	};

	// Sign Operators

	var signOperators = {
		'-': 'negate'
	};

	function $sign(operator, value) {
		var handler = signOperators[operator];
		if (value && value[handler]) {
			return value[handler]();
		}
		switch (operator) {
		case '+': return +value;
		case '-': return -value;
		default:
			throw new Error('Implement Sign Operator: ' + operator);
		}
	}

	// AST Helpers

	function isDynamic(exp) {
		var type = exp[0];
		return type != 'num' && type != 'string';
	}

	function handleOperator(operator, left, right) {
		// Only replace operators with calls to $operator if the left hand side
		// is potentially an object.
		if (operators[operator] && isDynamic(left)) {
			// Replace with call to $operator(left, operator, right):
			return ['call', ['name', '$eval'],
					[left, ['string', operator], right]];
		}
	}

	/**
	 * Compiles PaperScript code into JavaScript code.
	 *
	 * @name PaperScript.compile
	 * @function
	 * @param {String} code The PaperScript code.
	 * @return {String} The compiled PaperScript as JavaScript code.
	 */
	function compile(code) {
		// Use parse-js to translate the code into a AST structure which is then
		// walked and parsed for operators to overload. The resulting AST is
		// translated back to code and evaluated.
		var ast = parse_js.parse(code),
			walker = parse_js.ast_walker(),
			walk = walker.walk;

		ast = walker.with_walkers({
			'binary': function(operator, left, right) {
				// Handle simple mathematical operators here:
				return handleOperator(operator, left = walk(left),
						right = walk(right))
						// Always return something since we're walking left and
						|| [this[0], operator, left, right];
			},

			'assign': function(operator, left, right) {
				var res = handleOperator(operator, left = walk(left),
						right = walk(right));
				if (res)
					return [this[0], true, left, res];
				return [this[0], operator, left, right];
			},

			'unary-prefix': function(operator, exp) {
				if (signOperators[operator] && isDynamic(exp)) {
					return ['call', ['name', '$sign'],
							[['string', operator], walk(exp)]];
				}
			}
		}, function() {
			return walk(ast);
		});

		return parse_js.gen_code(ast, {
			beautify: true
		});
	}

	function evaluate(code, scope) {
		paper = scope;
		var view = scope.view,
			tool = /on(?:Key|Mouse)(?:Up|Down|Move|Drag)/.test(code)
					&& new Tool(),
			res;
		with (scope) {
			(function() {
				var onEditOptions, onSelect, onDeselect, onReselect, onMouseDown,
					onMouseUp, onMouseDrag, onMouseMove, onKeyDown, onKeyUp,
					onFrame, onResize,
					handlers = [ 'onEditOptions', 'onSelect', 'onDeselect',
						'onReselect', 'onMouseDown', 'onMouseUp', 'onMouseDrag',
						'onMouseMove', 'onKeyDown', 'onKeyUp'];
				res = eval(compile(code));
				if (tool) {
					Base.each(handlers, function(key) {
						tool[key] = eval(key);
					});
				}
				if (view) {
					view.onResize = onResize;
					view.setOnFrame(onFrame);
					view.draw();
				}
			}).call(scope);
		}
		return res;
	}

	function request(url, scope) {
		var xhr = new (window.ActiveXObject || XMLHttpRequest)(
				'Microsoft.XMLHTTP');
		xhr.open('GET', url, true);
		if (xhr.overrideMimeType) {
			xhr.overrideMimeType('text/plain');
		}
		xhr.onreadystatechange = function() {
			if (xhr.readyState === 4) {
				return evaluate(xhr.responseText, scope);
			}
		};
		return xhr.send(null);
	}

	function load() {
		var scripts = document.getElementsByTagName('script');
		for (var i = 0, l = scripts.length; i < l; i++) {
			var script = scripts[i];
			if (/^text\/(?:x-|)paperscript$/.test(script.type)
					&& !script.getAttribute('data-paper-loaded')) {
				var scope = new PaperScope(script);
				scope.setup(PaperScript.getAttribute(script, 'canvas'));
				if (script.src) {
					request(script.src, scope);
				} else {
					evaluate(script.innerHTML, scope);
				}
				script.setAttribute('data-paper-loaded', true);
			}
		}
	}

	DomEvent.add(window, { load: load });

	function handleAttribute(name) {
		name += 'Attribute';
		return function(el, attr) {
			return el[name](attr) || el[name]('data-paper-' + attr);
		};
	}

	return {
		compile: compile,
		evaluate: evaluate,
		load: load,
		getAttribute: handleAttribute('get'),
		hasAttribute: handleAttribute('has')
	};

};

this.load = PaperScript.load;

Base.each(this, function(val, key) {
	if (val && val.prototype instanceof Base) {
		val._name = key;
	}
});

this.enumerable = true;
return new (PaperScope.inject(this));
};