DIFFUSED BITMAP - CRÉATION D'UNE IMAGE DIFFUSE.

#region GetDiffusedBitmap (création d'une image diffuse)
/// <summary>
/// Retourne une image diffuse.
/// </summary>
/// <param name="img">Image d'origine.</param>
/// <param name="direction">Sens de la diffusion.</param>
/// <returns>Image diffusée.</returns>
public static Bitmap GetDiffusedBitmap(Image img, dbm_Direction direction)
{
	float stepFactor = 0.01f;
	float alphaFactor = stepFactor;
	float alpha = 1.0f;
	int step = 0;
	if (direction == dbm_Direction.Right || direction == dbm_Direction.Left)
		step = (int)(img.Width*stepFactor);
	else
		step = (int)(img.Height*stepFactor);

	int x = 0;
	if (direction == dbm_Direction.Left)
		x = img.Width - step;
	else if (direction == dbm_Direction.Top)
		x = img.Height - step;

	ColorMatrix cm = new ColorMatrix();
	cm.Matrix33 = alpha;

	ImageAttributes ia = new ImageAttributes();
	ia.SetColorMatrix(
		cm,
		ColorMatrixFlag.Default,
		ColorAdjustType.Bitmap
		);

	Bitmap bmp = new Bitmap(img.Width, img.Height);

	using (Graphics g = Graphics.FromImage(bmp))
	{
		while (cm.Matrix33 >= 0.0f)
		{
			Rectangle rect = Rectangle.Empty;
			if (direction == dbm_Direction.Right || direction == dbm_Direction.Left)
				rect = new Rectangle(x, 0, step, img.Height);
			else
				rect = new Rectangle(0, x, img.Width, step);
			g.DrawImage(
				img,
				rect,
				rect.X, 
				rect.Y,
				rect.Width,
				rect.Height,
				GraphicsUnit.Pixel,
				ia
				);

			if (direction == dbm_Direction.Right || direction == dbm_Direction.Bottom)
				x += step;
			else if (direction == dbm_Direction.Left || direction == dbm_Direction.Top)
				x -= step;

			alpha -= alphaFactor;
			cm.Matrix33 = alpha;
			ia.SetColorMatrix(
				cm,
				ColorMatrixFlag.Default,
				ColorAdjustType.Bitmap
				);
		}
	}

	return bmp;
}
#endregion

#region dbm_Direction
public enum dbm_Direction : short
{
	/// <summary>
	/// Vers la droite.
	/// </summary>
	Right			= 0,
	/// <summary>
	/// Vers la gauche.
	/// </summary>
	Left			= 1,
	/// <summary>
	/// Vers le haut.
	/// </summary>
	Top			= 2,
	/// <summary>
	/// Vers le bas.
	/// </summary>
	Bottom			= 3
}
	#endregion