Matter.js基于 Web 的 2D 图形引擎
Matter.js 是一个基于 Web 的 2D 图形引擎。
特性：
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物理属性(质量、面积、密度等)
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任何凸多边形的刚体
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稳定的叠加和 resting
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碰撞 (broad-phase, mid-phase and narrow-phase)
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Restitution (elastic and inelastic collisions)
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Conservation of momentum
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Friction and resistance
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Constraints
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Gravity
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Composite bodies
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Sleeping and static bodies
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Events
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Rounded corners (chamfering)
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Views (translate, zoom)
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Collision queries (raycasting, region tests)
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Time scaling (slow-mo, speed-up)
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Canvas renderer (supports vectors and textures)
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WebGL renderer (requires pixi.js)
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MatterTools for creating, testing and debugging worlds
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World state serialisation (requires resurrect.js)
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Cross-browser (Chrome, Firefox, Safari, IE8+)
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Mobile-compatible (touch, responsive)
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An original JavaScript physics implementation (not a port)
示例代码：
// Matter.js module aliases
var Engine = Matter.Engine,
World = Matter.World,
Bodies = Matter.Bodies;
// create a Matter.js engine
var engine = Engine.create(document.body);
// create two boxes and a ground
var boxA = Bodies.rectangle(400, 200, 80, 80);
var boxB = Bodies.rectangle(450, 50, 80, 80);
var ground = Bodies.rectangle(400, 610, 810, 60, { isStatic: true });
// add all of the bodies to the world
World.add(engine.world, [boxA, boxB, ground]);
// run the engine
Engine.run(engine);
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