Created
August 1, 2014 01:08
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Reproduction for box2d.js/emscripten bug.
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Box2D = require './box2d' | |
_createCollider = (body, id, radius) -> | |
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 = (x, y) -> | |
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 = (thsPtr, contactPtr) -> | |
contact = Box2D.wrapPointer(contactPtr, Box2D.b2Contact) | |
fixtureA = contact.GetFixtureA() | |
fixtureB = contact.GetFixtureB() | |
console.log 'BEGIN', fixtureA.GetUserData(), fixtureB.GetUserData() | |
contactCount++ | |
}]) | |
Box2D.customizeVTable(contactCb, [{ | |
original: Box2D.b2ContactListener.prototype.EndContact | |
replacement: | |
endContact = (thsPtr, contactPtr) -> | |
contact = Box2D.wrapPointer(contactPtr, Box2D.b2Contact) | |
fixtureA = contact.GetFixtureA() | |
fixtureB = contact.GetFixtureB() | |
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 in [0...50] | |
world.Step(0.1, 2, 2) | |
b2.SetLinearVelocity(new Box2D.b2Vec2(0, 0.5)) | |
for i in [0...100] | |
world.Step(0.1, 2, 2) | |
return |
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