public override void Update()
{
base.Update();
//returns true if we collide witht the grid at any position
if (Tank.Collider.Overlap(Tank.X, Tank.Y, CollidableTags.Wall))
{
//notify the tank
Tank.WallCollision = true;
//extract the wallCollider from the list of colliders with the tag wallcollider
GridCollider wallGridCollider = (GridCollider)Tank.Collider.CollideList(Tank.X, Tank.Y, CollidableTags.Wall)[0];
//calculate colliding tiles check start position, eg the top-left-most tile the tank could hit
int leftmostTile = wallGridCollider.GridX(Tank.Collider.Left);
int topmostTile = wallGridCollider.GridY(Tank.Collider.Top);
//get the collision rectangles
List <Rectangle> collidingRectangles = CollisionUtilites.GetCollidingRectangles(wallGridCollider, Tank, leftmostTile, topmostTile);
//filter out identical rectangles created when the tile checker found multiple colliding candidates
collidingRectangles = collidingRectangles.Distinct().ToList();
//reset out of all rectangles
foreach (Rectangle obstacle in collidingRectangles)
{
Vector2 projection = CollisionUtilites.ShortestProjection(Tank, obstacle);
//something smells fishy: the projection is larger than a complete tile? f**k that.
if (Math.Abs(projection.X) < wallGridCollider.TileWidth && Math.Abs(projection.Y) < wallGridCollider.TileHeight)
{
Tank.AddPosition(projection);
}
}
}
else
{
Tank.WallCollision = false;
}
}