main.js

/* globals define */
define(function(require, exports, module) {
    'use strict';
    // import dependencies
var Engine          = require('famous/core/Engine');
var Surface         = require('famous/core/Surface');
var EventHandler    = require('famous/core/EventHandler');
var View            = require('famous/core/View');
var Transform       = require('famous/core/Transform');

var StateModifier   = require('famous/modifiers/StateModifier');

var PhysicsEngine   = require('famous/physics/PhysicsEngine');
var Body            = require('famous/physics/bodies/Body');
var Circle          = require('famous/physics/bodies/Circle');
var Wall            = require('famous/physics/constraints/Wall');


    function wallBounce() {
        var context = Engine.createContext();

        var contextSize;// = context.getSize();

        var handler = new EventHandler();

        var physicsEngine = new PhysicsEngine();

        var ball = new Surface ({
          size: [200,200],
          properties: {
            backgroundColor: 'red',
            borderRadius: '100px'
          }
        })

        ball.state = new StateModifier({origin:[0.5,0.5]});

        ball.particle = new Circle({radius:100});

        physicsEngine.addBody(ball.particle);

        ball.on("click",function(){
          ball.particle.setVelocity([.1,.13,0]);
        });

        context.add(ball.state).add(ball);
        function setWalls() {
            //console.log(contextSize[0]);
            contextSize = context.getSize();
            var leftWall    = new Wall({normal : [1,0,0],  distance : contextSize[0]/2.0, restitution : .5});
            var rightWall   = new Wall({normal : [-1,0,0], distance : contextSize[0]/2.0, restitution : .5});
            var topWall     = new Wall({normal : [0,1,0],  distance : contextSize[1]/2.0, restitution : .5});
            var bottomWall  = new Wall({normal : [0,-1,0], distance : contextSize[1]/2.0, restitution : .5});

            physicsEngine.detachAll();
            physicsEngine.attach( leftWall,  [ball.particle]);
            physicsEngine.attach( rightWall, [ball.particle]);
            physicsEngine.attach( topWall,   [ball.particle]);
            physicsEngine.attach( bottomWall,[ball.particle]);
        };
        Engine.nextTick(setWalls);
        Engine.on('resize',setWalls);

        Engine.on('prerender', function(){
          ball.state.setTransform(ball.particle.getTransform())
        });
    };

    new wallBounce();

});