private static void SendCallbacks(List <Tuple <Sprite, Sprite> > matches)
{
foreach (var match in matches)
{
if (match.Item1 is ICollidable && match.Item2 is ICollidable)
{
Rectangle hb1 = SpriteUtils.GetHitbox(match.Item1);
Rectangle hb2 = SpriteUtils.GetHitbox(match.Item2);
if (hb1.Intersects(hb2))
{
Rectangle intersection = Rectangle.Intersect(hb1, hb2);
//Send the callbacks for each sprite
if (intersection.Right == hb1.Right &&
intersection.Height > intersection.Width &&
(match.Item1.Velocity.X > 0 || match.Item2.Velocity.X < 0)) //1 is seeing a collision on the right
{
(match.Item1 as ICollidable).OnCollision(Direction.RIGHT, match.Item2, intersection);
(match.Item2 as ICollidable).OnCollision(Direction.LEFT, match.Item1, intersection);
}
else if (intersection.Top == hb1.Top &&
intersection.Width > intersection.Height &&
(match.Item1.Velocity.Y < 0 || match.Item2.Velocity.Y > 0)) //1 is seeing a collision on the top
{
(match.Item1 as ICollidable).OnCollision(Direction.TOP, match.Item2, intersection);
(match.Item2 as ICollidable).OnCollision(Direction.BOTTOM, match.Item1, intersection);
}
else if (intersection.Bottom == hb1.Bottom &&
intersection.Width > intersection.Height &&
(match.Item1.Velocity.Y > 0 || match.Item2.Velocity.Y < 0)) //1 is seeing a collision on the bottom
{
(match.Item1 as ICollidable).OnCollision(Direction.BOTTOM, match.Item2, intersection);
(match.Item2 as ICollidable).OnCollision(Direction.TOP, match.Item1, intersection);
}
else if (intersection.Left == hb1.Left &&
intersection.Height > intersection.Width &&
(match.Item1.Velocity.X < 0 || match.Item2.Velocity.X > 0)) //1 is seeing a collision on the left
{
(match.Item1 as ICollidable).OnCollision(Direction.LEFT, match.Item2, intersection);
(match.Item2 as ICollidable).OnCollision(Direction.RIGHT, match.Item1, intersection);
}
}
}
}
}
//Given the nature of this game, we can safely compare every
//static sprite to every dynamic sprite
//Only ~30 static sprites will be active at once
//Only 1 dynamic sprite will be active at once
//Result: ~30 iterations each cycle. Basically nothing
private List <Tuple <Sprite, Sprite> > FindMatches()
{
List <Tuple <Sprite, Sprite> > matches = new List <Tuple <Sprite, Sprite> >();
lock (this.layer)
{
foreach (Sprite spriteD in this.Dynamics)
{
Rectangle hbD = SpriteUtils.GetHitbox(spriteD);
foreach (Sprite spriteS in this.Statics)
{
Rectangle hbS = SpriteUtils.GetHitbox(spriteS);
if (hbS.Intersects(hbD))
{
matches.Add(new Tuple <Sprite, Sprite>(spriteS, spriteD));
}
}
}
}
return(matches);
}
