private static bool checkCollisions(IEntityPhysics moveableEntity, IEntity otherEntity) { Shape moveableEntityBoundingBox = moveableEntity.boundingBox(); Shape otherEntityBoundingBox = otherEntity.boundingBox(); if (moveableEntityBoundingBox is Circle && otherEntityBoundingBox is Circle) { Circle movingEntityCircle = (Circle)moveableEntityBoundingBox; Circle otherEntityCircle = (Circle)otherEntityBoundingBox; float penetration; if ((penetration = circleCollision(movingEntityCircle, otherEntityCircle)) > 0) { float hitAngle = MyMathHelper.angleBetween(otherEntityCircle.origin, movingEntityCircle.origin); EventHandlers.getInstance().raiseEvent(new CollisionArgs(moveableEntity, otherEntity, hitAngle, penetration)); return true; } } else if (moveableEntityBoundingBox is Circle && otherEntityBoundingBox is QuadCollection) { Circle movingEntityCircle = (Circle)moveableEntityBoundingBox; QuadCollection quadCollection = (QuadCollection)otherEntityBoundingBox; foreach (Quad quad in quadCollection.quads) { KeyValuePair<float?, float> collisionAngle; if ((collisionAngle = quadCircleCollision(quad, movingEntityCircle)).Key != null) { EventHandlers.getInstance().raiseEvent(new CollisionArgs(moveableEntity, otherEntity, (float)collisionAngle.Key, collisionAngle.Value)); return true; } } } else { Debug.Assert(false, "No Collision defined for types " + moveableEntityBoundingBox.GetType() + " " + otherEntityBoundingBox.GetType()); } return false; }