private bool PixelCollides(Vector2 center, float ray, bool erase = false)
{
bool collision = false;
for (int y = 0; y < Height; y++)
{
for (int x = 0; x < Width; x++)
{
Vector2 pixelPos = new Vector2(position.X - (Width / 2) + x, position.Y - (Height / 2) + y);
float pixToBulletDist = pixelPos.Sub(center).GetLength();
if (pixToBulletDist <= ray)
{
//obtains index of current pixel's alpha
int pixelAlfaIndex = (y * Width + x) * 4 + 3;
if (erase)
{//must erase pixels inside the explosion's circle
sprite.GetSprite().bitmap[pixelAlfaIndex] = 0;
collision = true;
}
else
{
if (sprite.GetSprite().bitmap[pixelAlfaIndex] != 0)
{
return(true);
}
}
}
}
}
return(collision);
}
