/// <summary>
/// Stamp another sprite onto this sprite based on their scene positions
/// </summary>
/// <param name="otherSprite">The sprite to stamp onto this one</param>
/// <param name="stampMethod">Stamp drawing method (Normal or Cutout)</param>
/// <param name="stampMethod">Stamp cropping method (Crop or Grow)</param>
public void Stamp(Sprite otherSprite, StampMethods stampMethod, StampCroppings stampCropping)
{
switch (stampCropping)
{
case StampCroppings.CropToSprite:
break;
case StampCroppings.GrowSprite:
default:
throw new Exception("Sprite.Stamp() does not yet support cropping mode " + stampCropping);
}
int width = Costume.Width;
int height = Costume.Height;
switch (stampMethod)
{
case StampMethods.Normal:
{
RenderTarget2D newTexture = new RenderTarget2D(
this.Game.GraphicsDevice,
width,
height,
/*mipMap:*/ false,
/*preferredFormat:*/ SurfaceFormat.Color,
/*preferredDepthFormat:*/ DepthFormat.Depth24Stencil8,
/*preferredMultiSampleCount:*/ 1,
/*usage:*/ RenderTargetUsage.DiscardContents);
// Calculate a matrix which transforms from A's local space into
// world space and then into B's local space
Matrix TransformA = this.TransformAlt;
Matrix TransformB = otherSprite.TransformAlt;
Matrix transformAToB = TransformB * Matrix.Invert(TransformA);
Vector2 position;
float rotation;
float scale;
transformAToB.Decompose2D(out position, out rotation, out scale);
// Set render target
this.Game.GraphicsDevice.SetRenderTarget(newTexture);
this.Game.GraphicsDevice.Clear(Color.Transparent);
this.Game.spriteBatch.Begin();
// Copy the current costume
this.Game.spriteBatch.Draw(Costume.Texture, Vector2.Zero, Color.White);
// Draw the other sprite
this.Game.spriteBatch.Draw(otherSprite.Costume.Texture,
position,
null,
otherSprite.SpriteColor * otherSprite.Alpha,
rotation,
Vector2.Zero, // otherSprite.Costume.Center,
otherSprite.Scale / Scale,
SpriteEffects.None,
0f);
this.Game.spriteBatch.End();
// Unset render target
this.Game.GraphicsDevice.SetRenderTarget(null);
Costume.Texture = newTexture;
}
break;
case StampMethods.Cutout:
{
Color[] newPixels = StampAlpha(
this.Transform, this.Costume.Texture.Width, this.Costume.Texture.Height, this.Costume.Pixels,
otherSprite.Transform, otherSprite.Costume.Texture.Width, otherSprite.Costume.Texture.Height, otherSprite.Costume.Pixels, false);
Costume.Pixels = newPixels;
}
break;
case StampMethods.CutoutInverted:
{
Color[] newPixels = StampAlpha(
this.Transform, this.Costume.Texture.Width, this.Costume.Texture.Height, this.Costume.Pixels,
otherSprite.Transform, otherSprite.Costume.Texture.Width, otherSprite.Costume.Texture.Height, otherSprite.Costume.Pixels, true);
Costume.Pixels = newPixels;
}
break;
default:
throw new Exception("Sprite.Stamp() does not yet support stampMethod " + stampMethod);
}
}
/// <summary>
/// Stamp another sprite onto this sprite based on their scene positions. The other sprite will be cropped to the rectangle of the current sprite.
/// </summary>
/// <param name="otherSprite">The sprite to stamp onto this one</param>
/// <param name="stampMethod">Stamp drawing method (Normal or Cutout)</param>
public void Stamp(Sprite otherSprite, StampMethods stampMethod)
{
Stamp(otherSprite, stampMethod, StampCroppings.CropToSprite);
}
