public void AddSprite(Sprite sprite)
{
// Don't add null sprites or sprites that are already present.
if (null == sprite || _Sprites.Contains(sprite))
return;
_Sprites.Add(sprite);
}
// Gets called when we hit something
internal override void Hit(Sprite s2)
{
// Do I already have a parent?
if (null != Parent)
// Yes! I have a parent. So I'm already stuck to something.
return;
// Am I hitting a ship?
if (s2 is Ship)
// Yes! Ignore that, since I'll never really fire otherwise.
return;
// Otherwise, we hit something that we should stick to.
// Never time out.
_TimeOut = DateTime.MaxValue;
// And stick to whatever we hit.
Parent = s2;
}
protected bool CanBeParent(Sprite value)
{
List<Sprite> ancestors = new List<Sprite>();
Sprite parent = value;
while (null != parent)
{
if (this == parent)
return false;
parent = parent.Parent;
}
return true;
}
internal bool IsCollidingWith(Sprite s2)
{
// A Sprite colliding with itself is ignored.
if (this == s2)
return false;
// If a sprite hits something that doesn't exists, ignore.
if (s2._Image == null || this._Image == null)
return false;
if (this is Missile)
{
// Ignore collisions with ships. We are interested in missiles and planets only.
if ((s2 is AIShip) || (s2 is Ship)) return false;
}
else
return false;
Vector2F offset = this.Position - s2.Position;
double my_radius = Math.Sqrt(_Image.Width * _Image.Width + _Image.Height * _Image.Height)/2;
double s2_radius = Math.Sqrt(s2._Image.Width * s2._Image.Width + s2._Image.Height * s2._Image.Height)/2;
if (offset.Length > my_radius + s2_radius)
return false;
Bitmap b = new Bitmap(_Image.Width, _Image.Height);
Graphics g = Graphics.FromImage(b);
Matrix s2_to_world = s2.TransformLocalToWorld;
Matrix world_to_local = TransformLocalToWorld;
world_to_local.Invert();
Matrix s2_to_local = world_to_local;
s2_to_local.Multiply(s2_to_world);
g.Transform = s2_to_local;
Vector2F draw_location = new Vector2F(0,0);
g.DrawImage(s2._Image, draw_location);
for (int x = 0; x < b.Width; ++x)
for (int y = 0; y < b.Height; ++y)
{
Color mine = _Bitmap.GetPixel(x, y);
Color theirs = b.GetPixel(x, y);
if (mine.A > 0.5 && theirs.A > 0.5)
return true;
}
return false;
}
internal virtual void Hit(Sprite s2)
{
}
public void RemoveSprite(Sprite sprite)
{
_Sprites.Remove(sprite);
}
