Regis St-Gelais wrote:

> WinDrawOperation  maybe ??

I tried winOverlay, and it makes no difference. I would have to be
able to draw in transparent color over map features other than the
white or black background. I fear to have to write my own
WinPaintLine checking every pixel underneath...


Luc Le Blanc


> Luc Le Blanc <llebl...@cam.org> a écrit dans le message de news: 
> 188...@palm-dev-forum...
>> I display map features over a user-selected white or black
>> background. I sometimes have to do some filling that can happen
>> to overlap already drawn features (by filling triangles with
>> WinPaintLine.) Is there a way to avoid painting over already
>> drawn features by only allowing this painting over the
>> background color?
>> I read about transparency, but it seems to apply only to bitmaps,
>> and it's not clear how to use it. Alas, my PalmOS Bible is of no
>> help for this one.
>>
>>
>> Luc Le Blanc
>> http://www.speleo.qc.ca/Auriga
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