Re: [wxperl-users] How to draw on the screen?

[Mattia B. <mb...@ds...>]

> > >Any ideas why?
> > 
> > I don't have a wxPerl at hand here, but if you draw from 'new'
> > then the first paint event you get will destroy everything you painted.
> > If this is just a test case, and you do the drawing from an
> > event handler ( say in response to a menu/toolbar event ) then
> > I need to check at home.
> Eventually I indeed want to draw from an event handler, but for this
> test, I'm trying to create a ScrollWindow in a frame and try to paint on
> it from the constructor of the frame. The code gets executed without any
> warnings or errors, but the stuff just isn't displayed. Not even after a
> Refresh method or a resize ...
Yes, I understood, but my explanation was not clear at all:
you are doing:

* create the window
* draw in the window
* show the window 
  ( causes a wxEraseEvent & wxPaintEvent )
* maximize the window
  ( another wxEraseEvent & wxPaintEvent couple )

So whatever you draw is subsequently erased...
If you do:

* create the window
* show the window 
  ( causes a wxEraseEvent & wxPaintEvent )
* draw in the window

Then the picture is drawn and not erased ( until you
resize/refresh the window ).
Hope it's clearer now

Regards
Mattia