static void DrawSlowPixel(int x, int y, MyColor c)
        {
            Color cc = c.Convert();

            B.SetPixel(x, y, cc);

            Program.MyForm.PictureBoxInvalidate();
            currentRate++;
            if (currentRate > refreshRate)  // force l'affichage à l'écran tous les 1000pix
            {
                Program.MyForm.PictureBoxRefresh();
                currentRate = 0;
            }
        }
 static public void RefreshScreen(MyColor c)
 {
     if (!Program.MyForm.FastMode())
     {
         DisplayMode = DisplayMode.SLOW_MODE;
         Graphics g  = Graphics.FromImage(B);
         Color    cc = c.Convert();
         g.Clear(cc);
     }
     else
     {
         DisplayMode = DisplayMode.FULL_SPEED;
         data        = B.LockBits(new Rectangle(0, 0, B.Width, B.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb);
         stride      = data.Stride;
         for (int x = 0; x < Largeur; x++)
         {
             for (int y = 0; y < Hauteur; y++)
             {
                 DrawFastPixel(x, y, c);
             }
         }
     }
 }