From kde-devel  Sat Dec 28 07:21:10 2002
From: Pablo de Vicente <pvicentea () wanadoo ! es>
Date: Sat, 28 Dec 2002 07:21:10 +0000
To: kde-devel
Subject: How to update a QPainted qwidget?
X-MARC-Message: https://marc.info/?l=kde-devel&m=104106013516810

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Hello,

  I am writing some code in which I use QPainter to draw some axis and curves 
on a qwidget. Now I have two basic problems:

 - When the axis change I try to redraw them calling update(). When doing this 
instead of erasing the previous content of the widget and drawing the new 
axis I only append the new ones. I have tried with repaint(true), and I have 
also used erase() before calling update() or repaint(). But none of this 
works.

- - if I raise a window in front of the widget where I have the curves and then 
move the window to another place so that my widget is not covered by anything  
the content of the qwidget disappears. That is I loose the axis and curves I 
had previously drawn.

   With such brief description can someone tell me what I am missing to do 
things correctly?.

thanks,

Pablo de Vicente.
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