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constructor Window1;
begin
  InitializeComponent();

  fWriteableBitmap := new WriteableBitmap(1024, 256, 96, 96, PixelFormats.Bgr32, nil);
  image1.Source := fWriteableBitmap;

  fRect := new Int32Rect(0, 0, Integer(fWriteableBitmap.Width), Integer(fWriteableBitmap.Height));
  fRandom := new Random;
end;

method Window1.image1_MouseMove(sender: System.Object; e: System.Windows.Input.MouseEventArgs);
begin
  var buffer := new Byte[fWriteableBitmap.BackBufferStride * Integer(fWriteableBitmap.Height)];

  for i : Integer := 0 to buffer.Length-1 step 4 do
  begin
     buffer[i] := Byte( fRandom.Next(0,255) );
     buffer[i+1] := Byte( fRandom.Next(0,255) );
     buffer[i+2] := Byte( fRandom.Next(0,255) );
  end;
   
  fWriteableBitmap.WritePixels(fRect, buffer, fWriteableBitmap.BackBufferStride, 0);
end;					

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    public partial class Window1 : Window
    {
        private WriteableBitmap render;
        private Image disp;
        private Random r;

        public Window1()
        {
            InitializeComponent();
            render = new WriteableBitmap(512, 512, 96, 96, PixelFormats.Rgb24, null);
            disp = new Image();
            disp.Source = render;
            r = new Random();
            this.Content = disp;
        }

        private void Window_MouseMove(object sender, MouseEventArgs e)
        {
            byte[] buffer = new byte[render.BackBufferStride * (int)render.Height];
            for (int i = 0; i < buffer.Length - 1; i += 4)
            {
                buffer[i] = (byte)(r.Next(0, 255));
                buffer[i + 1] = (byte)(r.Next(0, 255));
                buffer[i + 2] = (byte)(r.Next(0, 255));
            }

            render.WritePixels(new Int32Rect(0, 0, 512, 512), buffer, render.BackBufferStride, 0);
        }
    }