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tagcanvas.js
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tagcanvas.js
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/**
* Copyright (C) 2010-2015 Graham Breach
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* TagCanvas 2.9
* For more information, please contact <[email protected]>
*/
(function(){
"use strict";
var i, j, abs = Math.abs, sin = Math.sin, cos = Math.cos, max = Math.max,
min = Math.min, ceil = Math.ceil, sqrt = Math.sqrt, pow = Math.pow,
hexlookup3 = {}, hexlookup2 = {}, hexlookup1 = {
0:"0,", 1:"17,", 2:"34,", 3:"51,", 4:"68,", 5:"85,",
6:"102,", 7:"119,", 8:"136,", 9:"153,", a:"170,", A:"170,",
b:"187,", B:"187,", c:"204,", C:"204,", d:"221,", D:"221,",
e:"238,", E:"238,", f:"255,", F:"255,"
}, Oproto, Tproto, TCproto, Mproto, Vproto, TSproto, TCVproto,
doc = document, ocanvas, handlers = {};
for(i = 0; i < 256; ++i) {
j = i.toString(16);
if(i < 16)
j = '0' + j;
hexlookup2[j] = hexlookup2[j.toUpperCase()] = i.toString() + ',';
}
function Defined(d) {
return typeof d != 'undefined';
}
function IsObject(o) {
return typeof o == 'object' && o != null;
}
function Clamp(v, mn, mx) {
return isNaN(v) ? mx : min(mx, max(mn, v));
}
function Nop() {
return false;
}
function TimeNow() {
return new Date().valueOf();
}
function SortList(l, f) {
var nl = [], tl = l.length, i;
for(i = 0; i < tl; ++i)
nl.push(l[i]);
nl.sort(f);
return nl;
}
function Shuffle(a) {
var i = a.length-1, t, p;
while(i) {
p = ~~(Math.random()*i);
t = a[i];
a[i] = a[p];
a[p] = t;
--i;
}
}
function Vector(x, y, z) {
this.x = x;
this.y = y;
this.z = z;
}
Vproto = Vector.prototype;
Vproto.length = function() {
return sqrt(this.x * this.x + this.y * this.y + this.z * this.z);
};
Vproto.dot = function(v) {
return this.x * v.x + this.y * v.y + this.z * v.z;
};
Vproto.cross = function(v) {
var x = this.y * v.z - this.z * v.y,
y = this.z * v.x - this.x * v.z,
z = this.x * v.y - this.y * v.x;
return new Vector(x, y, z);
};
Vproto.angle = function(v) {
var dot = this.dot(v), ac;
if(dot == 0)
return Math.PI / 2.0;
ac = dot / (this.length() * v.length());
if(ac >= 1)
return 0;
if(ac <= -1)
return Math.PI;
return Math.acos(ac);
};
Vproto.unit = function() {
var l = this.length();
return new Vector(this.x / l, this.y / l, this.z / l);
};
function MakeVector(lg, lt) {
lt = lt * Math.PI / 180;
lg = lg * Math.PI / 180;
var x = sin(lg) * cos(lt), y = -sin(lt), z = -cos(lg) * cos(lt);
return new Vector(x, y, z);
}
function Matrix(a) {
this[1] = {1: a[0], 2: a[1], 3: a[2]};
this[2] = {1: a[3], 2: a[4], 3: a[5]};
this[3] = {1: a[6], 2: a[7], 3: a[8]};
}
Mproto = Matrix.prototype;
Matrix.Identity = function() {
return new Matrix([1,0,0, 0,1,0, 0,0,1]);
};
Matrix.Rotation = function(angle, u) {
var sina = sin(angle), cosa = cos(angle), mcos = 1 - cosa;
return new Matrix([
cosa + pow(u.x, 2) * mcos, u.x * u.y * mcos - u.z * sina, u.x * u.z * mcos + u.y * sina,
u.y * u.x * mcos + u.z * sina, cosa + pow(u.y, 2) * mcos, u.y * u.z * mcos - u.x * sina,
u.z * u.x * mcos - u.y * sina, u.z * u.y * mcos + u.x * sina, cosa + pow(u.z, 2) * mcos
]);
}
Mproto.mul = function(m) {
var a = [], i, j, mmatrix = (m.xform ? 1 : 0);
for(i = 1; i <= 3; ++i)
for(j = 1; j <= 3; ++j) {
if(mmatrix)
a.push(this[i][1] * m[1][j] +
this[i][2] * m[2][j] +
this[i][3] * m[3][j]);
else
a.push(this[i][j] * m);
}
return new Matrix(a);
};
Mproto.xform = function(p) {
var a = {}, x = p.x, y = p.y, z = p.z;
a.x = x * this[1][1] + y * this[2][1] + z * this[3][1];
a.y = x * this[1][2] + y * this[2][2] + z * this[3][2];
a.z = x * this[1][3] + y * this[2][3] + z * this[3][3];
return a;
};
function PointsOnSphere(n,xr,yr,zr,magic) {
var i, y, r, phi, pts = [], off = 2/n, inc;
inc = Math.PI * (3 - sqrt(5) + (parseFloat(magic) ? parseFloat(magic) : 0));
for(i = 0; i < n; ++i) {
y = i * off - 1 + (off / 2);
r = sqrt(1 - y*y);
phi = i * inc;
pts.push([cos(phi) * r * xr, y * yr, sin(phi) * r * zr]);
}
return pts;
}
function Cylinder(n,o,xr,yr,zr,magic) {
var phi, pts = [], off = 2/n, inc, i, j, k, l;
inc = Math.PI * (3 - sqrt(5) + (parseFloat(magic) ? parseFloat(magic) : 0));
for(i = 0; i < n; ++i) {
j = i * off - 1 + (off / 2);
phi = i * inc;
k = cos(phi);
l = sin(phi);
pts.push(o ? [j * xr, k * yr, l * zr] : [k * xr, j * yr, l * zr]);
}
return pts;
}
function Ring(o, n, xr, yr, zr, j) {
var phi, pts = [], inc = Math.PI * 2 / n, i, k, l;
for(i = 0; i < n; ++i) {
phi = i * inc;
k = cos(phi);
l = sin(phi);
pts.push(o ? [j * xr, k * yr, l * zr] : [k * xr, j * yr, l * zr]);
}
return pts;
}
function PointsOnCylinderV(n,xr,yr,zr,m) { return Cylinder(n, 0, xr, yr, zr, m) }
function PointsOnCylinderH(n,xr,yr,zr,m) { return Cylinder(n, 1, xr, yr, zr, m) }
function PointsOnRingV(n, xr, yr, zr, offset) {
offset = isNaN(offset) ? 0 : offset * 1;
return Ring(0, n, xr, yr, zr, offset);
}
function PointsOnRingH(n, xr, yr, zr, offset) {
offset = isNaN(offset) ? 0 : offset * 1;
return Ring(1, n, xr, yr, zr, offset);
}
function CentreImage(t) {
var i = new Image;
i.onload = function() {
var dx = i.width / 2, dy = i.height / 2;
t.centreFunc = function(c, w, h, cx, cy) {
c.setTransform(1, 0, 0, 1, 0, 0);
c.globalAlpha = 1;
c.drawImage(i, cx - dx, cy - dy);
};
};
i.src = t.centreImage;
}
function SetAlpha(c,a) {
var d = c, p1, p2, ae = (a*1).toPrecision(3) + ')';
if(c[0] === '#') {
if(!hexlookup3[c])
if(c.length === 4)
hexlookup3[c] = 'rgba(' + hexlookup1[c[1]] + hexlookup1[c[2]] + hexlookup1[c[3]];
else
hexlookup3[c] = 'rgba(' + hexlookup2[c.substr(1,2)] + hexlookup2[c.substr(3,2)] + hexlookup2[c.substr(5,2)];
d = hexlookup3[c] + ae;
} else if(c.substr(0,4) === 'rgb(' || c.substr(0,4) === 'hsl(') {
d = (c.replace('(','a(').replace(')', ',' + ae));
} else if(c.substr(0,5) === 'rgba(' || c.substr(0,5) === 'hsla(') {
p1 = c.lastIndexOf(',') + 1, p2 = c.indexOf(')');
a *= parseFloat(c.substring(p1,p2));
d = c.substr(0,p1) + a.toPrecision(3) + ')';
}
return d;
}
function NewCanvas(w,h) {
// if using excanvas, give up now
if(window.G_vmlCanvasManager)
return null;
var c = doc.createElement('canvas');
c.width = w;
c.height = h;
return c;
}
// I think all browsers pass this test now...
function ShadowAlphaBroken() {
var cv = NewCanvas(3,3), c, i;
if(!cv)
return false;
c = cv.getContext('2d');
c.strokeStyle = '#000';
c.shadowColor = '#fff';
c.shadowBlur = 3;
c.globalAlpha = 0;
c.strokeRect(2,2,2,2);
c.globalAlpha = 1;
i = c.getImageData(2,2,1,1);
cv = null;
return (i.data[0] > 0);
}
function SetGradient(c, l, o, g) {
var gd = c.createLinearGradient(0, 0, l, 0), i;
for(i in g)
gd.addColorStop(1 - i, g[i]);
c.fillStyle = gd;
c.fillRect(0, o, l, 1);
}
function FindGradientColour(tc, p, r) {
var l = 1024, h = 1, gl = tc.weightGradient, cv, c, i, d;
if(tc.gCanvas) {
c = tc.gCanvas.getContext('2d');
h = tc.gCanvas.height;
} else {
if(IsObject(gl[0]))
h = gl.length;
else
gl = [gl];
tc.gCanvas = cv = NewCanvas(l, h);
if(!cv)
return null;
c = cv.getContext('2d');
for(i = 0; i < h; ++i)
SetGradient(c, l, i, gl[i]);
}
r = max(min(r || 0, h - 1), 0);
d = c.getImageData(~~((l - 1) * p), r, 1, 1).data;
return 'rgba(' + d[0] + ',' + d[1] + ',' + d[2] + ',' + (d[3]/255) + ')';
}
function TextSet(ctxt, font, colour, strings, padx, pady, shadowColour,
shadowBlur, shadowOffsets, maxWidth, widths, align) {
var xo = padx + (shadowBlur || 0) +
(shadowOffsets.length && shadowOffsets[0] < 0 ? abs(shadowOffsets[0]) : 0),
yo = pady + (shadowBlur || 0) +
(shadowOffsets.length && shadowOffsets[1] < 0 ? abs(shadowOffsets[1]) : 0), i, xc;
ctxt.font = font;
ctxt.textBaseline = 'top';
ctxt.fillStyle = colour;
shadowColour && (ctxt.shadowColor = shadowColour);
shadowBlur && (ctxt.shadowBlur = shadowBlur);
shadowOffsets.length && (ctxt.shadowOffsetX = shadowOffsets[0],
ctxt.shadowOffsetY = shadowOffsets[1]);
for(i = 0; i < strings.length; ++i) {
xc = 0;
if(widths) {
if('right' == align) {
xc = maxWidth - widths[i];
} else if('centre' == align) {
xc = (maxWidth - widths[i]) / 2;
}
}
ctxt.fillText(strings[i], xo + xc, yo);
yo += parseInt(font);
}
}
function RRect(c, x, y, w, h, r, s) {
if(r) {
c.beginPath();
c.moveTo(x, y + h - r);
c.arcTo(x, y, x + r, y, r);
c.arcTo(x + w, y, x + w, y + r, r);
c.arcTo(x + w, y + h, x + w - r, y + h, r);
c.arcTo(x, y + h, x, y + h - r, r);
c.closePath();
c[s ? 'stroke' : 'fill']();
} else {
c[s ? 'strokeRect' : 'fillRect'](x, y, w, h);
}
}
function TextCanvas(strings, font, w, h, maxWidth, stringWidths, align, valign,
scale) {
this.strings = strings;
this.font = font;
this.width = w;
this.height = h;
this.maxWidth = maxWidth;
this.stringWidths = stringWidths;
this.align = align;
this.valign = valign;
this.scale = scale;
}
TCVproto = TextCanvas.prototype;
TCVproto.SetImage = function(image, w, h, position, padding, align, valign,
scale) {
this.image = image;
this.iwidth = w * this.scale;
this.iheight = h * this.scale;
this.ipos = position;
this.ipad = padding * this.scale;
this.iscale = scale;
this.ialign = align;
this.ivalign = valign;
};
TCVproto.Align = function(size, space, a) {
var pos = 0;
if(a == 'right' || a == 'bottom')
pos = space - size;
else if(a != 'left' && a != 'top')
pos = (space - size) / 2;
return pos;
};
TCVproto.Create = function(colour, bgColour, bgOutline, bgOutlineThickness,
shadowColour, shadowBlur, shadowOffsets, padding, radius) {
var cv, cw, ch, c, x1, x2, y1, y2, offx, offy, ix, iy, iw, ih, rr,
sox = abs(shadowOffsets[0]), soy = abs(shadowOffsets[1]), shadowcv, shadowc;
padding = max(padding, sox + shadowBlur, soy + shadowBlur);
x1 = 2 * (padding + bgOutlineThickness);
y1 = 2 * (padding + bgOutlineThickness);
cw = this.width + x1;
ch = this.height + y1;
offx = offy = padding + bgOutlineThickness;
if(this.image) {
ix = iy = padding + bgOutlineThickness;
iw = this.iwidth;
ih = this.iheight;
if(this.ipos == 'top' || this.ipos == 'bottom') {
if(iw < this.width)
ix += this.Align(iw, this.width, this.ialign);
else
offx += this.Align(this.width, iw, this.align);
if(this.ipos == 'top')
offy += ih + this.ipad;
else
iy += this.height + this.ipad;
cw = max(cw, iw + x1);
ch += ih + this.ipad;
} else {
if(ih < this.height)
iy += this.Align(ih, this.height, this.ivalign);
else
offy += this.Align(this.height, ih, this.valign);
if(this.ipos == 'right')
ix += this.width + this.ipad;
else
offx += iw + this.ipad;
cw += iw + this.ipad;
ch = max(ch, ih + y1);
}
}
cv = NewCanvas(cw, ch);
if(!cv)
return null;
x1 = y1 = bgOutlineThickness / 2;
x2 = cw - bgOutlineThickness;
y2 = ch - bgOutlineThickness;
rr = min(radius, x2 / 2, y2 / 2);
c = cv.getContext('2d');
if(bgColour) {
c.fillStyle = bgColour;
RRect(c, x1, y1, x2, y2, rr);
}
if(bgOutlineThickness) {
c.strokeStyle = bgOutline;
c.lineWidth = bgOutlineThickness;
RRect(c, x1, y1, x2, y2, rr, true);
}
if(shadowBlur || sox || soy) {
// use a transparent canvas to draw on
shadowcv = NewCanvas(cw, ch);
if(shadowcv) {
shadowc = c;
c = shadowcv.getContext('2d');
}
}
// don't use TextSet shadow support because it adds space for shadow
TextSet(c, this.font, colour, this.strings, offx, offy, 0, 0, [],
this.maxWidth, this.stringWidths, this.align);
if(this.image)
c.drawImage(this.image, ix, iy, iw, ih);
if(shadowc) {
// draw the text and image with the added shadow
c = shadowc;
shadowColour && (c.shadowColor = shadowColour);
shadowBlur && (c.shadowBlur = shadowBlur);
c.shadowOffsetX = shadowOffsets[0];
c.shadowOffsetY = shadowOffsets[1];
c.drawImage(shadowcv, 0, 0);
}
return cv;
};
function ExpandImage(i, w, h) {
var cv = NewCanvas(w, h), c;
if(!cv)
return null;
c = cv.getContext('2d');
c.drawImage(i, (w - i.width) / 2, (h - i.height) / 2);
return cv;
}
function ScaleImage(i, w, h) {
var cv = NewCanvas(w, h), c;
if(!cv)
return null;
c = cv.getContext('2d');
c.drawImage(i, 0, 0, w, h);
return cv;
}
function AddBackgroundToImage(i, w, h, scale, colour, othickness, ocolour,
padding, radius, ofill) {
var cw = w + ((2 * padding) + othickness) * scale,
ch = h + ((2 * padding) + othickness) * scale,
cv = NewCanvas(cw, ch), c, x1, y1, x2, y2, ocanvas, cc, rr;
if(!cv)
return null;
othickness *= scale;
radius *= scale;
x1 = y1 = othickness / 2;
x2 = cw - othickness;
y2 = ch - othickness;
padding = (padding * scale) + x1; // add space for outline
c = cv.getContext('2d');
rr = min(radius, x2 / 2, y2 / 2);
if(colour) {
c.fillStyle = colour;
RRect(c, x1, y1, x2, y2, rr);
}
if(othickness) {
c.strokeStyle = ocolour;
c.lineWidth = othickness;
RRect(c, x1, y1, x2, y2, rr, true);
}
if(ofill) {
// use compositing to colour in the image and border
ocanvas = NewCanvas(cw, ch);
cc = ocanvas.getContext('2d');
cc.drawImage(i, padding, padding, w, h);
cc.globalCompositeOperation = 'source-in';
cc.fillStyle = ocolour;
cc.fillRect(0, 0, cw, ch);
cc.globalCompositeOperation = 'destination-over';
cc.drawImage(cv, 0, 0);
cc.globalCompositeOperation = 'source-over';
c.drawImage(ocanvas, 0, 0);
} else {
c.drawImage(i, padding, padding, i.width, i.height);
}
return {image: cv, width: cw / scale, height: ch / scale};
}
/**
* Rounds off the corners of an image
*/
function RoundImage(i, r, iw, ih, s) {
var cv, c, r1 = parseFloat(r), l = max(iw, ih);
cv = NewCanvas(iw, ih);
if(!cv)
return null;
if(r.indexOf('%') > 0)
r1 = l * r1 / 100;
else
r1 = r1 * s;
c = cv.getContext('2d');
c.globalCompositeOperation = 'source-over';
c.fillStyle = '#fff';
if(r1 >= l/2) {
r1 = min(iw,ih) / 2;
c.beginPath();
c.moveTo(iw/2,ih/2);
c.arc(iw/2,ih/2,r1,0,2*Math.PI,false);
c.fill();
c.closePath();
} else {
r1 = min(iw/2,ih/2,r1);
RRect(c, 0, 0, iw, ih, r1, true);
c.fill();
}
c.globalCompositeOperation = 'source-in';
c.drawImage(i, 0, 0, iw, ih);
return cv;
}
/**
* Creates a new canvas containing the image and its shadow
* Returns an object containing the image and its dimensions at z=0
*/
function AddShadowToImage(i, w, h, scale, sc, sb, so) {
var sw = abs(so[0]), sh = abs(so[1]),
cw = w + (sw > sb ? sw + sb : sb * 2) * scale,
ch = h + (sh > sb ? sh + sb : sb * 2) * scale,
xo = scale * ((sb || 0) + (so[0] < 0 ? sw : 0)),
yo = scale * ((sb || 0) + (so[1] < 0 ? sh : 0)), cv, c;
cv = NewCanvas(cw, ch);
if(!cv)
return null;
c = cv.getContext('2d');
sc && (c.shadowColor = sc);
sb && (c.shadowBlur = sb * scale);
so && (c.shadowOffsetX = so[0] * scale, c.shadowOffsetY = so[1] * scale);
c.drawImage(i, xo, yo, w, h);
return {image: cv, width: cw / scale, height: ch / scale};
}
function FindTextBoundingBox(s,f,ht) {
var w = parseInt(s.toString().length * ht), h = parseInt(ht * 2 * s.length),
cv = NewCanvas(w,h), c, idata, w1, h1, x, y, i, ex;
if(!cv)
return null;
c = cv.getContext('2d');
c.fillStyle = '#000';
c.fillRect(0,0,w,h);
TextSet(c,ht + 'px ' + f,'#fff',s,0,0,0,0,[],'centre')
idata = c.getImageData(0,0,w,h);
w1 = idata.width; h1 = idata.height;
ex = {
min: { x: w1, y: h1 },
max: { x: -1, y: -1 }
};
for(y = 0; y < h1; ++y) {
for(x = 0; x < w1; ++x) {
i = (y * w1 + x) * 4;
if(idata.data[i+1] > 0) {
if(x < ex.min.x) ex.min.x = x;
if(x > ex.max.x) ex.max.x = x;
if(y < ex.min.y) ex.min.y = y;
if(y > ex.max.y) ex.max.y = y;
}
}
}
// device pixels might not be css pixels
if(w1 != w) {
ex.min.x *= (w / w1);
ex.max.x *= (w / w1);
}
if(h1 != h) {
ex.min.y *= (w / h1);
ex.max.y *= (w / h1);
}
cv = null;
return ex;
}
function FixFont(f) {
return "'" + f.replace(/(\'|\")/g,'').replace(/\s*,\s*/g, "', '") + "'";
}
function AddHandler(h,f,e) {
e = e || doc;
if(e.addEventListener)
e.addEventListener(h,f,false);
else
e.attachEvent('on' + h, f);
}
function RemoveHandler(h,f,e) {
e = e || doc;
if(e.removeEventListener)
e.removeEventListener(h, f);
else
e.detachEvent('on' + h, f);
}
function AddImage(i, o, t, tc) {
var s = tc.imageScale, mscale, ic, bc, oc, iw, ih;
// image not loaded, wait for image onload
if(!o.complete)
return AddHandler('load',function() { AddImage(i,o,t,tc); }, o);
if(!i.complete)
return AddHandler('load',function() { AddImage(i,o,t,tc); }, i);
// Yes, this does look like nonsense, but it makes sure that both the
// width and height are actually set and not just calculated. This is
// required to keep proportional sizes when the images are hidden, so
// the images can be used again for another cloud.
o.width = o.width;
o.height = o.height;
if(s) {
i.width = o.width * s;
i.height = o.height * s;
}
// the standard width of the image, with imageScale applied
t.iw = i.width;
t.ih = i.height;
if(tc.txtOpt) {
ic = i;
mscale = tc.zoomMax * tc.txtScale;
iw = t.iw * mscale;
ih = t.ih * mscale;
if(iw < o.naturalWidth || ih < o.naturalHeight) {
ic = ScaleImage(i, iw, ih);
if(ic)
t.fimage = ic;
} else {
iw = t.iw;
ih = t.ih;
mscale = 1;
}
if(parseFloat(tc.imageRadius))
t.image = t.fimage = i = RoundImage(t.image, tc.imageRadius, iw, ih, mscale);
if(!t.HasText()) {
if(tc.shadow) {
ic = AddShadowToImage(t.image, iw, ih, mscale, tc.shadow, tc.shadowBlur,
tc.shadowOffset);
if(ic) {
t.fimage = ic.image;
t.w = ic.width;
t.h = ic.height;
}
}
if(tc.bgColour || tc.bgOutlineThickness) {
bc = tc.bgColour == 'tag' ? GetProperty(t.a, 'background-color') :
tc.bgColour;
oc = tc.bgOutline == 'tag' ? GetProperty(t.a, 'color') :
(tc.bgOutline || tc.textColour);
iw = t.fimage.width;
ih = t.fimage.height;
if(tc.outlineMethod == 'colour') {
// create the outline version first, using the current image state
ic = AddBackgroundToImage(t.fimage, iw, ih, mscale, bc,
tc.bgOutlineThickness, t.outline.colour, tc.padding, tc.bgRadius, 1);
if(ic)
t.oimage = ic.image;
}
ic = AddBackgroundToImage(t.fimage, iw, ih, mscale, bc,
tc.bgOutlineThickness, oc, tc.padding, tc.bgRadius);
if(ic) {
t.fimage = ic.image;
t.w = ic.width;
t.h = ic.height;
}
}
if(tc.outlineMethod == 'size') {
if(tc.outlineIncrease > 0) {
t.iw += 2 * tc.outlineIncrease;
t.ih += 2 * tc.outlineIncrease;
iw = mscale * t.iw;
ih = mscale * t.ih;
ic = ScaleImage(t.fimage, iw, ih);
t.oimage = ic;
t.fimage = ExpandImage(t.fimage, t.oimage.width, t.oimage.height);
} else {
iw = mscale * (t.iw + (2 * tc.outlineIncrease));
ih = mscale * (t.ih + (2 * tc.outlineIncrease));
ic = ScaleImage(t.fimage, iw, ih);
t.oimage = ExpandImage(ic, t.fimage.width, t.fimage.height);
}
}
}
}
t.Init();
}
function GetProperty(e,p) {
var dv = doc.defaultView, pc = p.replace(/\-([a-z])/g,function(a){return a.charAt(1).toUpperCase()});
return (dv && dv.getComputedStyle && dv.getComputedStyle(e,null).getPropertyValue(p)) ||
(e.currentStyle && e.currentStyle[pc]);
}
function FindWeight(a, wFrom, tHeight) {
var w = 1, p;
if(wFrom) {
w = 1 * (a.getAttribute(wFrom) || tHeight);
} else if(p = GetProperty(a,'font-size')) {
w = (p.indexOf('px') > -1 && p.replace('px','') * 1) ||
(p.indexOf('pt') > -1 && p.replace('pt','') * 1.25) ||
p * 3.3;
}
return w;
}
function EventToCanvasId(e) {
return e.target && Defined(e.target.id) ? e.target.id :
e.srcElement.parentNode.id;
}
function EventXY(e, c) {
var xy, p, xmul = parseInt(GetProperty(c, 'width')) / c.width,
ymul = parseInt(GetProperty(c, 'height')) / c.height;
if(Defined(e.offsetX)) {
xy = {x: e.offsetX, y: e.offsetY};
} else {
p = AbsPos(c.id);
if(Defined(e.changedTouches))
e = e.changedTouches[0];
if(e.pageX)
xy = {x: e.pageX - p.x, y: e.pageY - p.y};
}
if(xy && xmul && ymul) {
xy.x /= xmul;
xy.y /= ymul;
}
return xy;
}
function MouseOut(e) {
var cv = e.target || e.fromElement.parentNode, tc = TagCanvas.tc[cv.id];
if(tc) {
tc.mx = tc.my = -1;
tc.UnFreeze();
tc.EndDrag();
}
}
function MouseMove(e) {
var i, t = TagCanvas, tc, p, tg = EventToCanvasId(e);
for(i in t.tc) {
tc = t.tc[i];
if(tc.tttimer) {
clearTimeout(tc.tttimer);
tc.tttimer = null;
}
}
if(tg && t.tc[tg]) {
tc = t.tc[tg];
if(p = EventXY(e, tc.canvas)) {
tc.mx = p.x;
tc.my = p.y;
tc.Drag(e, p);
}
tc.drawn = 0;
}
}
function MouseDown(e) {
var t = TagCanvas, cb = doc.addEventListener ? 0 : 1,
tg = EventToCanvasId(e);
if(tg && e.button == cb && t.tc[tg]) {
t.tc[tg].BeginDrag(e);
}
}
function MouseUp(e) {
var t = TagCanvas, cb = doc.addEventListener ? 0 : 1,
tg = EventToCanvasId(e), tc;
if(tg && e.button == cb && t.tc[tg]) {
tc = t.tc[tg];
MouseMove(e);
if(!tc.EndDrag() && !tc.touchState)
tc.Clicked(e);
}
}
function TouchDown(e) {
var tg = EventToCanvasId(e), tc = (tg && TagCanvas.tc[tg]), p;
if(tc && e.changedTouches) {
if(e.touches.length == 1 && tc.touchState == 0) {
tc.touchState = 1;
tc.BeginDrag(e);
if(p = EventXY(e, tc.canvas)) {
tc.mx = p.x;
tc.my = p.y;
tc.drawn = 0;
}
} else if(e.targetTouches.length == 2 && tc.pinchZoom) {
tc.touchState = 3;
tc.EndDrag();
tc.BeginPinch(e);
} else {
tc.EndDrag();
tc.EndPinch();
tc.touchState = 0;
}
}
}
function TouchUp(e) {
var tg = EventToCanvasId(e), tc = (tg && TagCanvas.tc[tg]);
if(tc && e.changedTouches) {
switch(tc.touchState) {
case 1:
tc.Draw();
tc.Clicked();
break;
case 2:
tc.EndDrag();
break;
case 3:
tc.EndPinch();
}
tc.touchState = 0;
}
}
function TouchMove(e) {
var i, t = TagCanvas, tc, p, tg = EventToCanvasId(e);
for(i in t.tc) {
tc = t.tc[i];
if(tc.tttimer) {
clearTimeout(tc.tttimer);
tc.tttimer = null;
}
}
tc = (tg && t.tc[tg]);
if(tc && e.changedTouches && tc.touchState) {
switch(tc.touchState) {
case 1:
case 2:
if(p = EventXY(e, tc.canvas)) {
tc.mx = p.x;
tc.my = p.y;
if(tc.Drag(e, p))
tc.touchState = 2;
}
break;
case 3:
tc.Pinch(e);
}
tc.drawn = 0;
}
}
function MouseWheel(e) {
var t = TagCanvas, tg = EventToCanvasId(e);
if(tg && t.tc[tg]) {
e.cancelBubble = true;
e.returnValue = false;
e.preventDefault && e.preventDefault();
t.tc[tg].Wheel((e.wheelDelta || e.detail) > 0);
}
}
function Scroll(e) {
var i, t = TagCanvas;
clearTimeout(t.scrollTimer);
for(i in t.tc) {
t.tc[i].Pause();
}
t.scrollTimer = setTimeout(function() {
var i, t = TagCanvas;
for(i in t.tc) {
t.tc[i].Resume();
}
}, t.scrollPause);
}
function DrawCanvas() {
DrawCanvasRAF(TimeNow());
}
function DrawCanvasRAF(t) {
var tc = TagCanvas.tc, i;
TagCanvas.NextFrame(TagCanvas.interval);
t = t || TimeNow();
for(i in tc)
tc[i].Draw(t);
}
function AbsPos(id) {
var e = doc.getElementById(id), r = e.getBoundingClientRect(),
dd = doc.documentElement, b = doc.body, w = window,
xs = w.pageXOffset || dd.scrollLeft,
ys = w.pageYOffset || dd.scrollTop,
xo = dd.clientLeft || b.clientLeft,
yo = dd.clientTop || b.clientTop;
return { x: r.left + xs - xo, y: r.top + ys - yo };
}
function Project(tc,p1,sx,sy) {
var m = tc.radius * tc.z1 / (tc.z1 + tc.z2 + p1.z);
return {
x: p1.x * m * sx,
y: p1.y * m * sy,
z: p1.z,
w: (tc.z1 - p1.z) / tc.z2
};
}
/**
* @constructor
* for recursively splitting tag contents on <br> tags
*/
function TextSplitter(e) {
this.e = e;
this.br = 0;
this.line = [];
this.text = [];
this.original = e.innerText || e.textContent;
}
TSproto = TextSplitter.prototype;
TSproto.Empty = function() {
for(var i = 0; i < this.text.length; ++i)
if(this.text[i].length)
return false;
return true;
};
TSproto.Lines = function(e) {
var r = e ? 1 : 0, cn, cl, i;
e = e || this.e;
cn = e.childNodes;
cl = cn.length;
for(i = 0; i < cl; ++i) {
if(cn[i].nodeName == 'BR') {
this.text.push(this.line.join(' '));
this.br = 1;
} else if(cn[i].nodeType == 3) {
if(this.br) {
this.line = [cn[i].nodeValue];
this.br = 0;
} else {
this.line.push(cn[i].nodeValue);
}
} else {
this.Lines(cn[i]);
}
}
r || this.br || this.text.push(this.line.join(' '));
return this.text;
};
TSproto.SplitWidth = function(w, c, f, h) {
var i, j, words, text = [];
c.font = h + 'px ' + f;
for(i = 0; i < this.text.length; ++i) {
words = this.text[i].split(/\s+/);
this.line = [words[0]];
for(j = 1; j < words.length; ++j) {
if(c.measureText(this.line.join(' ') + ' ' + words[j]).width > w) {
text.push(this.line.join(' '));
this.line = [words[j]];
} else {
this.line.push(words[j]);
}
}
text.push(this.line.join(' '));
}
return this.text = text;
};
/**
* @constructor
*/
function Outline(tc,t) {
this.ts = null;
this.tc = tc;
this.tag = t;
this.x = this.y = this.w = this.h = this.sc = 1;
this.z = 0;
this.pulse = 1;
this.pulsate = tc.pulsateTo < 1;
this.colour = tc.outlineColour;
this.adash = ~~tc.outlineDash;
this.agap = ~~tc.outlineDashSpace || this.adash;
this.aspeed = tc.outlineDashSpeed * 1;
if(this.colour == 'tag')
this.colour = GetProperty(t.a, 'color');
else if(this.colour == 'tagbg')
this.colour = GetProperty(t.a, 'background-color');
this.Draw = this.pulsate ? this.DrawPulsate : this.DrawSimple;
this.radius = tc.outlineRadius | 0;
this.SetMethod(tc.outlineMethod);
}
Oproto = Outline.prototype;
Oproto.SetMethod = function(om) {
var methods = {
block: ['PreDraw','DrawBlock'],
colour: ['PreDraw','DrawColour'],
outline: ['PostDraw','DrawOutline'],
classic: ['LastDraw','DrawOutline'],
size: ['PreDraw','DrawSize'],
none: ['LastDraw']
}, funcs = methods[om] || methods.outline;
if(om == 'none') {
this.Draw = function() { return 1; }
} else {
this.drawFunc = this[funcs[1]];
}
this[funcs[0]] = this.Draw;
};
Oproto.Update = function(x,y,w,h,sc,z,xo,yo) {
var o = this.tc.outlineOffset, o2 = 2 * o;
this.x = sc * x + xo - o;
this.y = sc * y + yo - o;
this.w = sc * w + o2;
this.h = sc * h + o2;
this.sc = sc; // used to determine frontmost
this.z = z;
};
Oproto.Ants = function(c) {
if(!this.adash)
return;
var l = this.adash, g = this.agap, s = this.aspeed, length = l + g,
l1 = 0, l2 = l, g1 = g, g2 = 0, seq = 0, ants;
if(s) {
seq = abs(s) * (TimeNow() - this.ts) / 50;
if(s < 0)
seq = 8.64e6 - seq;
s = ~~seq % length;