public virtual bool MouseDown(b2Vec2 p) { m_mouseWorld = p; if (m_mouseJoint != null) { return(false); } // Make a small box. b2AABB aabb = new b2AABB(); b2Vec2 d = new b2Vec2(); d.Set(0.001f, 0.001f); aabb.LowerBound = p - d; aabb.UpperBound = p + d; // Query the world for overlapping shapes. QueryCallback callback = new QueryCallback(p); m_world.QueryAABB(callback, aabb); if (callback.m_fixture != null) { b2Body body = callback.m_fixture.Body; b2MouseJointDef md = new b2MouseJointDef(); md.BodyA = m_groundBody; md.BodyB = body; md.target = p; md.maxForce = 1000.0f * body.Mass; m_mouseJoint = (b2MouseJoint)m_world.CreateJoint(md); body.SetAwake(true); return(true); } return(false); }