world.js

Vec2 = Box2D.Common.Math.b2Vec2;
BodyDef = Box2D.Dynamics.b2BodyDef;
Body = Box2D.Dynamics.b2Body;
FixtureDef = Box2D.Dynamics.b2FixtureDef;
Fixture = Box2D.Dynamics.b2Fixture;
World = Box2D.Dynamics.b2World;
MassData = Box2D.Collision.Shapes.b2MassData;
PolygonShape = Box2D.Collision.Shapes.b2PolygonShape;
CircleShape = Box2D.Collision.Shapes.b2CircleShape;
DebugDraw = Box2D.Dynamics.b2DebugDraw;
RevoluteJointDef = Box2D.Dynamics.Joints.b2RevoluteJointDef;


PhysicsEngineClass = Class.extend({
    world: null,

    //-----------------------------------------
    create: function () {
        gPhysicsEngine.world = new World(
            new Vec2(0, 0), 
            false
        );
    }

});

var gPhysicsEngine = new PhysicsEngineClass();