Saya melihat bahwa Anda menandai pertanyaan sebagai 2d, jadi saya akan melanjutkan dan membuang kode saya:
class Sprite {
[...]
public bool CollidesWith(Sprite other)
{
// Default behavior uses per-pixel collision detection
return CollidesWith(other, true);
}
public bool CollidesWith(Sprite other, bool calcPerPixel)
{
// Get dimensions of texture
int widthOther = other.Texture.Width;
int heightOther = other.Texture.Height;
int widthMe = Texture.Width;
int heightMe = Texture.Height;
if ( calcPerPixel && // if we need per pixel
(( Math.Min(widthOther, heightOther) > 100) || // at least avoid doing it
( Math.Min(widthMe, heightMe) > 100))) // for small sizes (nobody will notice :P)
{
return Bounds.Intersects(other.Bounds) // If simple intersection fails, don't even bother with per-pixel
&& PerPixelCollision(this, other);
}
return Bounds.Intersects(other.Bounds);
}
static bool PerPixelCollision(Sprite a, Sprite b)
{
// Get Color data of each Texture
Color[] bitsA = new Color[a.Texture.Width * a.Texture.Height];
a.Texture.GetData(bitsA);
Color[] bitsB = new Color[b.Texture.Width * b.Texture.Height];
b.Texture.GetData(bitsB);
// Calculate the intersecting rectangle
int x1 = Math.Max(a.Bounds.X, b.Bounds.X);
int x2 = Math.Min(a.Bounds.X + a.Bounds.Width, b.Bounds.X + b.Bounds.Width);
int y1 = Math.Max(a.Bounds.Y, b.Bounds.Y);
int y2 = Math.Min(a.Bounds.Y + a.Bounds.Height, b.Bounds.Y + b.Bounds.Height);
// For each single pixel in the intersecting rectangle
for (int y = y1; y < y2; ++y)
{
for (int x = x1; x < x2; ++x)
{
// Get the color from each texture
Color a = bitsA[(x - a.Bounds.X) + (y - a.Bounds.Y)*a.Texture.Width];
Color b = bitsB[(x - b.Bounds.X) + (y - b.Bounds.Y)*b.Texture.Width];
if (a.A != 0 && b.A != 0) // If both colors are not transparent (the alpha channel is not 0), then there is a collision
{
return true;
}
}
}
// If no collision occurred by now, we're clear.
return false;
}
private Rectangle bounds = Rectangle.Empty;
public virtual Rectangle Bounds
{
get
{
return new Rectangle(
(int)Position.X - Texture.Width,
(int)Position.Y - Texture.Height,
Texture.Width,
Texture.Height);
}
}
Sunting : Walaupun kode ini hampir jelas, saya merasa tidak enak karena tidak memiliki komentar, jadi saya menambahkan beberapa;) Saya juga menyingkirkan operasi bitwise karena pada dasarnya melakukan apa yang properti Color.A lakukan dengan cara yang lebih rumit ;)