public static LTexture CreateShadowTexture(LTexture texture, float alpha,
float scale, float angle)
{
int width = texture.Width;
int height = texture.Height;
LPixmap image = new LPixmap(texture);
int centerX = width / 2;
int centerY = height / 2;
int offsetX = (int)((width - image.Width) / 2);
int offsetY = (int)((height - image.Height) / 2);
Loon.Core.Geom.Matrix.Transform2i t = new Loon.Core.Geom.Matrix.Transform2i();
t.Rotate(angle, centerX, centerY);
t.Zoom(scale, centerX, centerY);
LPixmap shadowProcess = new LPixmap(width, height,
image.IsAlpha());
shadowProcess.DrawPixmap(image, offsetX, offsetY);
shadowProcess.Transparency();
shadowProcess.Mul(255, 0, 0, 0);
shadowProcess.Mul((int)(alpha * 255), 255, 255, 255);
shadowProcess.Convolve(LPixmap.GaussianBlurKernel());
shadowProcess.Transform(t);
if (image != null)
{
image.Dispose();
image = null;
}
return(shadowProcess.Texture);
}