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test.html
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Box2D Javascript Fun : 12 : Box2D with Collision and Damage and HTML5 Canvas</title>
<link rel="author" href="http://profiles.google.com/sethladd">
<script src="js/lib/Box2dWeb-2.1.a.3.min.js"></script>
<script>
var b2Vec2 = Box2D.Common.Math.b2Vec2
, b2BodyDef = Box2D.Dynamics.b2BodyDef
, b2Body = Box2D.Dynamics.b2Body
, b2FixtureDef = Box2D.Dynamics.b2FixtureDef
, b2Fixture = Box2D.Dynamics.b2Fixture
, b2World = Box2D.Dynamics.b2World
, b2MassData = Box2D.Collision.Shapes.b2MassData
, b2PolygonShape = Box2D.Collision.Shapes.b2PolygonShape
, b2CircleShape = Box2D.Collision.Shapes.b2CircleShape
, b2DebugDraw = Box2D.Dynamics.b2DebugDraw
, b2RevoluteJointDef = Box2D.Dynamics.Joints.b2RevoluteJointDef
;
function bTest(intervalRate, adaptive, width, height, scale) {
this.intervalRate = parseInt(intervalRate);
this.adaptive = adaptive;
this.width = width;
this.height = height;
this.scale = scale;
this.bodiesMap = {};
this.world = new b2World(
new b2Vec2(0, 10) //gravity
, true //allow sleep
);
this.fixDef = new b2FixtureDef;
this.fixDef.density = 1.0;
this.fixDef.friction = 0.5;
this.fixDef.restitution = 0.2;
}
// bTest.prototype.buildGround = function() {
// //create ground
// var bodyDef = new b2BodyDef;
// bodyDef.type = b2Body.b2_staticBody;
//
// // positions the center of the object (not upper left!)
// bodyDef.position.x = this.width / 2 / this.scale;
// bodyDef.position.y = this.height / 2 / this.scale;
// bodyDef.angle = (45*Math.PI) / 180; // radians
// bodyDef.userData = '__BODY__';
//
// this.fixDef.shape = new b2PolygonShape;
//
// // half width, half height. eg actual height here is 1 unit
// this.fixDef.shape.SetAsBox((this.width-(this.width*0.1) / this.scale) / 2, (10/this.scale) / 2);
// this.registerBody(bodyDef).CreateFixture(this.fixDef);
// }
bTest.prototype.update = function() {
var start = Date.now();
var stepRate = (this.adaptive) ? (now - this.lastTimestamp) / 1000 : (1 / this.intervalRate);
this.world.Step(
stepRate //frame-rate
, 10 //velocity iterations
, 10 //position iterations
);
this.world.ClearForces();
return (Date.now() - start);
}
bTest.prototype.getState = function() {
var state = {};
for (var b = this.world.GetBodyList(); b; b = b.m_next) {
if (b.IsActive() && typeof b.GetUserData() !== 'undefined' && b.GetUserData() != null) {
state[b.GetUserData()] = this.getBodySpec(b);
}
}
return state;
}
bTest.prototype.getBodySpec = function(b) {
return {x: b.GetPosition().x, y: b.GetPosition().y, a: b.GetAngle(), c: {x: b.GetWorldCenter().x, y: b.GetWorldCenter().y}};
}
bTest.prototype.setBodies = function(bodyEntities) {
var bodyDef = new b2BodyDef;
for(var id in bodyEntities) {
var entity = bodyEntities[id];
if (entity.id == 'ground') {
bodyDef.type = b2Body.b2_staticBody;
} else {
bodyDef.type = b2Body.b2_dynamicBody;
}
bodyDef.position.x = entity.x;
bodyDef.position.y = entity.y;
bodyDef.userData = entity.id;
bodyDef.angle = entity.angle;
var body = this.registerBody(bodyDef);
if (entity.radius) {
this.fixDef.shape = new b2CircleShape(entity.radius);
body.CreateFixture(this.fixDef);
} else if (entity.polys) {
for (var j = 0; j < entity.polys.length; j++) {
var points = entity.polys[j];
var vecs = [];
for (var i = 0; i < points.length; i++) {
var vec = new b2Vec2();
vec.Set(points[i].x, points[i].y);
vecs[i] = vec;
}
this.fixDef.shape = new b2PolygonShape;
this.fixDef.shape.SetAsArray(vecs, vecs.length);
body.CreateFixture(this.fixDef);
}
} else {
this.fixDef.shape = new b2PolygonShape;
this.fixDef.shape.SetAsBox(entity.halfWidth, entity.halfHeight);
body.CreateFixture(this.fixDef);
}
}
this.ready = true;
}
bTest.prototype.registerBody = function(bodyDef) {
var body = this.world.CreateBody(bodyDef);
this.bodiesMap[body.GetUserData()] = body;
return body;
}
bTest.prototype.addRevoluteJoint = function(body1Id, body2Id, params) {
var body1 = this.bodiesMap[body1Id];
var body2 = this.bodiesMap[body2Id];
var joint = new b2RevoluteJointDef();
joint.Initialize(body1, body2, body1.GetWorldCenter());
if (params && params.motorSpeed) {
joint.motorSpeed = params.motorSpeed;
joint.maxMotorTorque = params.maxMotorTorque;
joint.enableMotor = true;
}
this.world.CreateJoint(joint);
}
bTest.prototype.applyImpulse = function(bodyId, degrees, power) {
var body = this.bodiesMap[bodyId];
body.ApplyImpulse(new b2Vec2(Math.cos(degrees * (Math.PI / 180)) * power,
Math.sin(degrees * (Math.PI / 180)) * power),
body.GetWorldCenter());
}
bTest.prototype.addContactListener = function(callbacks) {
var listener = new Box2D.Dynamics.b2ContactListener;
if (callbacks.BeginContact) listener.BeginContact = function(contact) {
callbacks.BeginContact(contact.GetFixtureA().GetBody().GetUserData(),
contact.GetFixtureB().GetBody().GetUserData());
}
if (callbacks.EndContact) listener.EndContact = function(contact) {
callbacks.EndContact(contact.GetFixtureA().GetBody().GetUserData(),
contact.GetFixtureB().GetBody().GetUserData());
}
if (callbacks.PostSolve) listener.PostSolve = function(contact, impulse) {
callbacks.PostSolve(contact.GetFixtureA().GetBody().GetUserData(),
contact.GetFixtureB().GetBody().GetUserData(),
impulse.normalImpulses[0]);
}
this.world.SetContactListener(listener);
}
bTest.prototype.removeBody = function(id) {
this.world.DestroyBody(this.bodiesMap[id]);
}
</script>
<style>
body {
-webkit-transform: translateZ(0);
}
</style>
</head>
<body>
<canvas id="c0" width="640" height="480" style="border: 1px solid black"></canvas>
<script async>
// http://paulirish.com/2011/requestanimationframe-for-smart-animating/
window.requestAnimFrame = (function(){
return window.requestAnimationFrame ||
window.webkitRequestAnimationFrame ||
window.mozRequestAnimationFrame ||
window.oRequestAnimationFrame ||
window.msRequestAnimationFrame ||
function(/* function */ callback, /* DOMElement */ element){
window.setTimeout(callback, 1000 / 60);
};
})();
</script>
<script async>
var SCALE = 30;
var NULL_CENTER = {x:null, y:null};
function Entity(id, x, y, angle, center, color, strength) {
this.id = id;
this.x = x;
this.y = y;
this.angle = angle || 0;
this.center = center;
this.color = color || "red";
this.isHit = false;
this.strength = strength;
this.dead = false;
}
Entity.prototype.hit = function(impulse, source) {
this.isHit = true;
if (this.strength) {
this.strength -= impulse;
if (this.strength <= 0) {
this.dead = true
}
}
//console.log(this.id + ", " + impulse + ", " + source.id + ", " + this.strength);
}
Entity.prototype.getColor = function() {
if (this.isHit) {
return 'black';
} else {
return this.color;
}
}
Entity.prototype.update = function(state) {
this.x = state.x;
this.y = state.y;
this.center = state.c;
this.angle = state.a;
}
Entity.prototype.draw = function(ctx) {
ctx.fillStyle = 'black';
ctx.beginPath();
ctx.arc(this.x * SCALE, this.y * SCALE, 4, 0, Math.PI * 2, true);
ctx.closePath();
ctx.fill();
ctx.fillStyle = 'yellow';
ctx.beginPath();
ctx.arc(this.center.x * SCALE, this.center.y * SCALE, 2, 0, Math.PI * 2, true);
ctx.closePath();
ctx.fill();
// clear
this.isHit = false;
}
Entity.build = function(def) {
if (def.radius) {
return new CircleEntity(def.id, def.x, def.y, def.angle, NULL_CENTER, def.color, def.strength, def.radius);
} else if (def.polys) {
return new PolygonEntity(def.id, def.x, def.y, def.angle, NULL_CENTER, def.color, def.strength, def.polys);
} else {
return new RectangleEntity(def.id, def.x, def.y, def.angle, NULL_CENTER, def.color, def.strength, def.halfWidth, def.halfHeight);
}
}
function CircleEntity(id, x, y, angle, center, color, strength, radius) {
color = color || 'aqua';
Entity.call(this, id, x, y, angle, center, color, strength);
this.radius = radius;
}
CircleEntity.prototype = new Entity();
CircleEntity.prototype.constructor = CircleEntity;
CircleEntity.prototype.draw = function(ctx) {
ctx.save();
ctx.translate(this.x * SCALE, this.y * SCALE);
ctx.rotate(this.angle);
ctx.translate(-(this.x) * SCALE, -(this.y) * SCALE);
ctx.fillStyle = this.getColor();
ctx.strokeStyle = 'black';
ctx.beginPath();
ctx.arc(this.x * SCALE, this.y * SCALE, this.radius * SCALE, 0, Math.PI * 2, true);
ctx.moveTo(this.x * SCALE, this.y * SCALE);
ctx.lineTo((this.x) * SCALE, (this.y + this.radius) * SCALE);
ctx.closePath();
ctx.fill();
ctx.stroke();
ctx.restore();
Entity.prototype.draw.call(this, ctx);
}
function RectangleEntity(id, x, y, angle, center, color, strength, halfWidth, halfHeight) {
Entity.call(this, id, x, y, angle, center, color, strength);
this.halfWidth = halfWidth;
this.halfHeight = halfHeight;
}
RectangleEntity.prototype = new Entity();
RectangleEntity.prototype.constructor = RectangleEntity;
RectangleEntity.prototype.draw = function(ctx) {
ctx.save();
ctx.translate(this.x * SCALE, this.y * SCALE);
ctx.rotate(this.angle);
ctx.translate(-(this.x) * SCALE, -(this.y) * SCALE);
ctx.fillStyle = this.getColor();
ctx.fillRect((this.x-this.halfWidth) * SCALE,
(this.y-this.halfHeight) * SCALE,
(this.halfWidth*2) * SCALE,
(this.halfHeight*2) * SCALE);
ctx.restore();
Entity.prototype.draw.call(this, ctx);
}
function PolygonEntity(id, x, y, angle, center, color, strength, polys) {
Entity.call(this, id, x, y, angle, center, color, strength);
this.polys = polys;
}
PolygonEntity.prototype = new Entity();
PolygonEntity.prototype.constructor = PolygonEntity;
PolygonEntity.prototype.draw = function(ctx) {
ctx.save();
ctx.translate(this.x * SCALE, this.y * SCALE);
ctx.rotate(this.angle);
ctx.translate(-(this.x) * SCALE, -(this.y) * SCALE);
ctx.fillStyle = this.getColor();
for (var i = 0; i < this.polys.length; i++) {
var points = this.polys[i];
ctx.beginPath();
ctx.moveTo((this.x + points[0].x) * SCALE, (this.y + points[0].y) * SCALE);
for (var j = 1; j < points.length; j++) {
ctx.lineTo((points[j].x + this.x) * SCALE, (points[j].y + this.y) * SCALE);
}
ctx.lineTo((this.x + points[0].x) * SCALE, (this.y + points[0].y) * SCALE);
ctx.closePath();
ctx.fill();
ctx.stroke();
}
ctx.restore();
Entity.prototype.draw.call(this, ctx);
}
var world = {};
var bodiesState = null;
var box = null;
function update(animStart) {
box.update();
bodiesState = box.getState();
var graveyard = [];
for (var id in bodiesState) {
var entity = world[id];
if (entity && world[id].dead) {
box.removeBody(id);
graveyard.push(id);
} else if (entity) {
entity.update(bodiesState[id]);
}
}
for (var i = 0; i < graveyard.length; i++) {
delete world[graveyard[i]];
}
}
var ctx = document.getElementById("c0").getContext("2d");
var canvasWidth = ctx.canvas.width;
var canvasHeight = ctx.canvas.height;
function draw() {
//console.log("d");
ctx.clearRect(0, 0, canvasWidth, canvasHeight);
for (var id in world) {
var entity = world[id];
entity.draw(ctx);
}
}
var running = true;
function init() {
var initialState = [
{id: "ground", x: ctx.canvas.width / 2 / SCALE, y: ctx.canvas.height / SCALE, halfHeight: 0.5, halfWidth: ctx.canvas.width / SCALE, color: 'yellow'},
{id: "ball", x: 2, y: ctx.canvas.height / SCALE - 2, radius: 0.5},
{id: "b1", x:6, y: ctx.canvas.height / SCALE - 1, halfHeight: 2, halfWidth: 0.10, strength: 25},
{id: "b2", x:17, y: ctx.canvas.height / SCALE - 5, halfHeight: 0.25, halfWidth: 2, strength: 30}
];
for (var i = 0; i < initialState.length; i++) {
world[initialState[i].id] = Entity.build(initialState[i]);
}
box = new bTest(60, false, canvasWidth, canvasHeight, SCALE);
box.setBodies(world);
box.addContactListener({
BeginContact: function(idA, idB) {
//console.log('b');
},
PostSolve: function(idA, idB, impulse) {
//console.log('p');
if (impulse < 0.1) return;
var entityA = world[idA];
var entityB = world[idB];
entityA.hit(impulse, entityB);
entityB.hit(impulse, entityA);
}
});
setTimeout(function() {
box.applyImpulse("ball", 70, 90);
}, 1000);
setTimeout(function() {
init();
}, 10000);
}
document.addEventListener("DOMContentLoaded", function() {
init();
(function loop(animStart) {
update(animStart);
draw();
requestAnimFrame(loop);
})();
}, false);
</script>
</body>
</html>