| BaseCollisionChecker | (c) 2010 Nicolas Gramlich (c) 2011 Zynga Inc. |
| LineCollisionChecker | (c) 2010 Nicolas Gramlich (c) 2011 Zynga Inc. |
| RectangularShapeCollisionChecker | (c) 2010 Nicolas Gramlich (c) 2011 Zynga Inc. |
| ShapeCollisionChecker | (c) 2010 Nicolas Gramlich (c) 2011 Zynga Inc. |
| TriangleCollisionChecker | (c) Zynga 2011 |