[pygtk] pixmap question...

[Gustavo J. A. M. Carneiro]

On Sat, 2007-10-13 at 11:58 +0100, Rory Walsh wrote:
> I'm trying to animate a line being drawn across the screen. My first 
> attempt using only a drawingarea proved fruitless so I am now trying it 
> using a pixmap and a drawing area. I have the following code which is 
> hacked from several bits of code I found online. I'm confused as to how 
> I am supposed to update the the drawing area with the pixmap image? 
> Here's the code, can anyone spot any obvious silliness?

 I don't know what's wrong with your code, but I know you are using
outdated APIs to draw; you should be using cairo instead.

 This example of animation using cairo might help you:
http://www.gnome.org/~gjc/merrychristmas.py

> 
> Rory.
> 
> p.s. I posted this yesterday but I think it got caught up somewhere in a 
> different thread, sorry about the noise..
> 
> 
> import pygtk
> pygtk.require('2.0')
> import gtk
> import gobject
> import math
> 
> xcor = 0
> 
> def pix_init(d_area, width, height):
>      d_area.realize()
>      win = d_area.window
>      pixmap = gtk.gdk.Pixmap(win, width, height, -1)
>      context = win.new_gc()
>      cmap = d_area.get_colormap()
>      context.foreground = cmap.alloc_color(128*64,128*64,128*64)
>      for x in range(width):
>          pixmap.draw_point(context, x, height / 2)
>      d_area.connect("expose-event", pix_expose, pixmap)
>      return pixmap
> 
> def pix_expose(da, event, pixmap):
>      x, y, width, height = da.get_allocation()
>      da.window.draw_drawable(
>      da.get_style().fg_gc[0], pixmap, 0, 0, 0, 0, -1, -1)
> 
> def draw(da, pixmap):
>      global xcor
>      win = da.window
>      context = win.new_gc()
>      pixmap.draw_point(context, xcor, 100)
>      da.queue_draw()
>      xcor=xcor+1
>      print xcor
>      return True
> 
> def redraw_timeout(da, pixmap):
>      #da.window.invalidate_rect((0,0,200,200),False)
>      return True
> 
> def main():
>      global xcor
>      xcor = 0
>      width,height=640,480
>      top = gtk.Window(gtk.WINDOW_TOPLEVEL)
>      da = gtk.DrawingArea()
>      #print dir(da)
>      da.set_size_request(width, height)
>      top.add(da)
>      pixmap=pix_init(da, width, height)
>      top.show_all()
>      gobject.timeout_add(120,draw,da,pixmap)
>      gtk.main()
> 
> if __name__ =="__main__":
>      main()
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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" -- Frank Herbert