public void DrawImage(IImage image, Rect frame, double alpha = 1.0)
{
var ii = image as ImageImage;
if (ii != null)
{
if (alpha < 0.999)
{
var i = new ImageAttributes();
var mat = new ColorMatrix(new float[][] {
new[] { 1.0f, 0.0f, 0.0f, 0.0f, 0.0f },
new[] { 0.0f, 1.0f, 0.0f, 0.0f, 0.0f },
new[] { 0.0f, 0.0f, 1.0f, 0.0f, 0.0f },
new[] { 0.0f, 0.0f, 0.0f, (float)alpha, 0.0f },
new[] { 0.0f, 0.0f, 0.0f, 0.0f, 1.0f }
});
i.SetColorMatrix(mat);
var size = ii.Image.Size;
graphics.DrawImage(ii.Image, Conversions.GetRectangle(frame),
0, 0, size.Width, size.Height, GraphicsUnit.Pixel, i);
}
else
{
graphics.DrawImage(ii.Image, Conversions.GetRectangleF(frame));
}
}
}
