troubleshooting Question

Differences in D4 and D6 TImage component? Getting flicker in D6.

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edsteele asked on
Delphi
3 Comments1 Solution289 ViewsLast Modified:
I have an application that I wrote in Delphi 4 a few years ago.  It generates a Mandelbrot image and displays the image as it's rendered.  I recompiled under Delphi 6, and now the TImage component flickers like crazy while it displays.  This is extremely annoying.  What changed between these two version to cause this?

Here is the code in the main loop:

  for i := 0 to iMandel.Height do
  begin
    for r := 0 to iMandel.Width do
    begin
      iMandel.Picture.Bitmap.Canvas.Pixels[r, i] :=
        ChooseColor(MandelComputeAndTest(MinX + (r * deltaR), MinY + (i * deltaI)));
    end;
    iMandel.Refresh;
    Application.ProcessMessages;
    if StopRender then
      Break;
  end;

iMandel in the TImage component.
MandelComputeAndTest computes a value for the point passed in.
ChooseColor maps that returned value into a color.

I tried commenting out the "iMandel.Refresh" and the "Application.ProcessMessages".  Neither of these stopped the flicker.

I just tried Delphi 7 and it doesn't flicker.  However, I prefer D6 to D7, so if anyone can help I would greatly appreciate it.

Thanks
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