When you say "rubber-banding" what do you mean?
 
If I take the XOR away, I get the rectangle redrawing over itself continuously as I draw out
 a rectangle. 
 
Are you saying that as I:
 
event.Dragging() and even.LeftIsDown():
   # Refresh the background with the bitmap
   # draw a solid rectangle
 



>  Date: Thu, 8 May 2008 15:33:49 -0700> From: timr@[...].com> To: wxpython-users@[...].org> 
Subject: Re: [wxpython-users] What's going on with wx.Pen()?>  > Marlin Rowley wrote:> >> > I
'm confused. I've set up a rectangular region program that will draw >  > a rectangle and dyn
amically size it when the user drags the mouse. >  > This is going to be used for viewing onl
y images within the window. I >  > want the pen to be bright red. And I want it to be that wa
y ALL the >  > time! For some reason, when I change the background color of my brush > > to s
omething OTHER than black, I get a different color. Why?>  > Is it really that confusing? Not
ice:>  > > > def OnMotion(self,event):> > if event.Dragging() and event.LeftIsDown():> > # ge
t device context of canvas>  > dc= wx.BufferedDC(wx.ClientDC(self),self.buffer)> > > > # Set 
logical function to XOR for rubberbanding>  > dc.SetLogicalFunction(wx.XOR)> > That's the rea
son. You are drawing with a red pen, but the logical >  function means that the color of the 
pen is XOR-ed with the color of the >  background. When the background is black, the pixel va
lue is 0, and >  anything XORed with 0 is itself. When the background is not black, > XORing 
with red simple inverts the red component in whatever color was >  there before.> > This is a
bsolutely normal behavior for rubber banding. If you really >  want a red rubber band all of 
the time, then you can't use a simple >  erase-the-old and draw-the-new scheme for drawing th
e rubber band. You >  will have to use some kind of double-buffered scheme, by keeping a copy
 >  of the background in a bitmap. Then every time the rubber banding > changes, you'll have 
to copy the virgin bitmap to the screen, then draw >  the rubber band on top of it.> > -- > T
im Roberts, timr@[...].com>  Providenza & Boekelheide, Inc.> > ______________________________
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