public void HandleCollisions()
{
// handle on screen collision
// object collision
foreach (ICollidable objMover in collidableObjects)
{
// first object must be moving
if (typeof(IMobile).IsAssignableFrom(objMover.GetType()))
{
IMobile mover = (IMobile)objMover;
if (!mover.Stopped)
{
// scan all other objects to see if there is a collision with them
foreach (ICollidable objCollider in collidableObjects)
{
if (objMover != objCollider &&
objCollider.CurrentObjectRectangle.Intersects(objMover.CurrentObjectRectangle))
{
// detect collision direction
CollisionDirection direction = CollisionDirection.NONE;
if (objMover.CurrentObjectRectangle.Bottom > objCollider.CurrentObjectRectangle.Y &&
objMover.CurrentObjectRectangle.Bottom < objCollider.CurrentObjectRectangle.Bottom)
{
if (objMover.CurrentObjectRectangle.Right > objCollider.CurrentObjectRectangle.X ||
objMover.CurrentObjectRectangle.Left < objCollider.CurrentObjectRectangle.Right)
{
direction = CollisionDirection.TOP;
}
}
else if (objCollider.CurrentObjectRectangle.Bottom > objMover.CurrentObjectRectangle.Y)
{
direction = CollisionDirection.BOTTOM;
}
// handle collision on the mover
if (typeof(ISurface).IsAssignableFrom(objCollider.GetType()))
{
mover.HandleMobileCollision <ISurface>(objCollider, direction);
}
}
}
}
}
}
// game area edge collision
// TODO : defer off screen collision to another Thread
}