[cairo] Pycairo issues

[Gustavo J. A. M. Carneiro]

On Qua, 2006-07-05 at 22:18 -0400, Eduardo Silva wrote:
> Mi name is Eduardo, I'm writing from Chile. 
> 
> I have a problem with a simple drawingarea :
> 
> In the expose event I drawed a rectangle with a blue color and then a
> grid. When I push a button (gtkbutton), this call a
> gobject.timeout_add(...) method and the callable method start to draw
> a simple line every 500ms, that's working fine until the expose event
> appears: move the window, minimize, etc. the expose event redraw all
> that I have and it create a new context, but the function that's
> working from gobject.timeout_add(...) can't draw in the context,
> functions like move_to and line_to say that all is ok but I don't know
> what happens because nothing is drawed again.

  Tips:
	1. draw only from expose event
	2. always create a new cairo context from inside the expose event
handler
	3. don't draw from the timeout handler; instead, call
draw_area.queue_draw() and let the expose event be generated.

  Example: http://www.gnome.org/~gjc/merrychristmas.py

> 
> ideas??
> 
> best regards.
> 
> Eduardo Silva
> Valparaiso - Chile 
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-- 
Gustavo J. A. M. Carneiro
<gjc at inescporto.pt> <gustavo at users.sourceforge.net>
The universe is always one step beyond logic.