gistfile1.txt

// Generated by CoffeeScript 1.6.3
(function() {
  var Box2D, b1, b2, beginContact, contactCb, contactCount, endContact, f1, f2, i, world, _createBody, _createCollider, _i, _j;

  Box2D = require('./box2d');

  _createCollider = function(body, id, radius) {
    var fixtureDef, shape;
    shape = new Box2D.b2CircleShape();
    shape.set_m_radius(radius);
    fixtureDef = new Box2D.b2FixtureDef();
    fixtureDef.set_density(1);
    fixtureDef.set_shape(shape);
    fixtureDef.set_userData(id);
    return body.CreateFixture(fixtureDef);
  };

  _createBody = function(x, y) {
    var bodyDef, pos;
    pos = new Box2D.b2Vec2(x, y);
    bodyDef = new Box2D.b2BodyDef();
    bodyDef.set_type(Box2D.b2_dynamicBody);
    bodyDef.set_position(pos);
    return world.CreateBody(bodyDef);
  };

  contactCount = 0;

  contactCb = new Box2D.b2ContactListener();

  Box2D.customizeVTable(contactCb, [
    {
      original: Box2D.b2ContactListener.prototype.BeginContact,
      replacement: beginContact = function(thsPtr, contactPtr) {
        var contact, fixtureA, fixtureB;
        contact = Box2D.wrapPointer(contactPtr, Box2D.b2Contact);
        fixtureA = contact.GetFixtureA();
        fixtureB = contact.GetFixtureB();
        console.log('BEGIN', fixtureA.GetUserData(), fixtureB.GetUserData());
        return contactCount++;
      }
    }
  ]);

  Box2D.customizeVTable(contactCb, [
    {
      original: Box2D.b2ContactListener.prototype.EndContact,
      replacement: endContact = function(thsPtr, contactPtr) {
        var contact, fixtureA, fixtureB;
        contact = Box2D.wrapPointer(contactPtr, Box2D.b2Contact);
        fixtureA = contact.GetFixtureA();
        fixtureB = contact.GetFixtureB();
        return console.log('END', fixtureA.GetUserData(), fixtureB.GetUserData());
      }
    }
  ]);

  world = new Box2D.b2World(new Box2D.b2Vec2(0, 0));

  world.SetContactListener(contactCb);

  b1 = _createBody(1, 1);

  f1 = _createCollider(b1, 1, 1);

  b2 = _createBody(1, 5);

  f2 = _createCollider(b2, 2, 1);

  b2.SetLinearVelocity(new Box2D.b2Vec2(0, -0.5));

  while (contactCount === 0) {
    world.Step(0.1, 2, 2);
  }

  for (i = _i = 0; _i < 50; i = ++_i) {
    world.Step(0.1, 2, 2);
  }

  b2.SetLinearVelocity(new Box2D.b2Vec2(0, 0.5));

  for (i = _j = 0; _j < 100; i = ++_j) {
    world.Step(0.1, 2, 2);
  }

  return;

}).call(this);