Re: Graphics "goes away" - New Information


"Chris Burnette" <burnette@xxxxxxxxxxxxxxxxxx> wrote in message
news:ejfxt9$XFHA.2508@xxxxxxxxxxxxxxxxxxxxxxx
> When it stops, does it stop forever (ie... minimizing / restoring the
dialog
> causes it to not redraw)? If so, this would allow you to place a debug the
> code and place a breakpoint in it when the problem occurs.
>

The code does not stop. The only thing that stops is the lines do not
display.



> Does this happen just on the one machine or does it happen on other
machines
> as well? Could it be an issue with the video card driver?

It happens on all machines.


>
> Going back to my original thought on the GDI resource leak, do you draw
all
> of the lines with the same pen or are you selecting / deselecting
different
> pens per line? Do you deselect and delete the pen at the end of the
drawing
> operation?
>

The Task Manager shows no resource leaks.

> You mentioned that you were doing the drawing in the WM_PAINT. Is this
where
> the calculations to determine the points are occurring also? Could you
> precalculate the points and simply draw them in WM_PAINT (this would speed
> up the drawing)?

The points are calculated in WM_PAINT. It would take 1000 * 120 * 2 points.
I will have to think about that.

>
> Is there anyway you can post a code snippet of your WM_PAINT?

Not in its present configuration. The calculations are spead over dozens of
functions.


JW


.

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