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HTML 

              
                <div id="canvas-container"></div>
 </div>
!

CSS 

              
                body { 
    background: #8dd;
    text-align: center;
}

canvas {
    margin: 0;
    max-height:100%;
    max-width:100%;
    border-radius: 3px;
}

canvas:active { 
    cursor: pointer;
    cursor: -webkit-grabbing;
}

#canvas-container {
    margin: 0px 0;
}
!

JS 

              
                (function() {

    // Matter aliases
    var Engine = Matter.Engine,
        World = Matter.World,
        Bodies = Matter.Bodies,
        Body = Matter.Body,
        Composite = Matter.Composite,
        Composites = Matter.Composites,
        Common = Matter.Common,
        Constraint = Matter.Constraint,
        Events = Matter.Events;

    var Demo = {};

    var _engine,
        _sceneName;
  
      Body.create = function(options) {
        var defaults = {
            id: Body.nextId(),
            angle: 0,
            position: { x: 0, y: 0 },
            force: { x: 0, y: 0 },
            torque: 0,
            positionImpulse: { x: 0, y: 0 },
            speed: 0,
            angularSpeed: 0,
            velocity: { x: 0, y: 0 },
            angularVelocity: 0,
            isStatic: false,
            isSleeping: false,
            motion: 1,
            sleepThreshold: 60,
            density: 0.001,
            restitution: 0,
            friction: 0.01,
            frictionAir: 0.3,
            path: 'L 0 0 L 40 0 L 40 40 L 0 40',
            fillStyle: options.isStatic ? 'rgba(255,255,255,1.0)' : Common.choose(['#EACDCD', '#75394D', '#402E2B', '#57734A', '#BFBF56']),
            strokeStyle:'rgba(25,25,25,0.0)',
            strokeWidth: 0,
            lineWidth: 0,
            groupId: 0,
            slop: 0.0
        };

        var body = Common.extend(defaults, options);

        Body.updateProperties(body);

        return body;
    };
    
    Demo.init = function() {
        var container = document.getElementById('canvas-container');

        // engine options - these are the defaults
        var options = {
            positionIterations: 6,
            velocityIterations: 6,
            enableSleeping: false,
            timeScale: 1
        };

        // create a Matter engine, with the element to insert the canvas into
        // NOTE: this is actually Matter.Engine.create(), see the aliases at top of this file
        _engine = Engine.create(container, options);

        // run the engine
        Engine.run(_engine);

        // default scene function name
        _sceneName = 'avalanche';
        
        // get the scene function name from hash
        if (window.location.hash.length !== 0) 
            _sceneName = window.location.hash.replace('#', '');

        // set up a scene with bodies
        Demo[_sceneName]();
    };

    if (window.addEventListener) {
        window.addEventListener('load', Demo.init);
    } else if (window.attachEvent) {
        window.attachEvent('load', Demo.init);
    }
    
    Demo.avalanche = function() {
        var _world = _engine.world;
        
       //Demo.reset();
        _engine.enableSleeping = false;
        _engine.world.gravity.y = 1.5;
      
        var renderOptions = _engine.render.options;
        renderOptions.wireframes = false;        
        renderOptions.background = 'rbg(255,255,234)';

        var offset = 5;
        World.addBody(_world, Bodies.rectangle(400, 600 + offset, 800.5 + 2 * offset, 50.5, { isStatic: true }));
        World.addBody(_world, Bodies.rectangle(800 + offset, 300, 50.5, 600.5 + 2 * offset, { isStatic: true }));
        World.addBody(_world, Bodies.rectangle(-offset, 300, 50.5, 600.5 + 2 * offset, { isStatic: true }));
        
      
        var stack = Composites.stack(300, 10, 4, 10, 0, 0, function(x, y, column, row) {
            return Bodies.polygon(x, y, 8,25,{
                                        render: {
                                          sprite: {
                                            texture: 'http://mixsandwich.info/js/sakura.png'
                                          }
                                        }
            });
        });
        
        World.addComposite(_world, stack);
        
        World.addBody(_world, Bodies.polygon(400, 300, 5, 50, { isStatic : true}));

    };
  
})();
!
999px

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