[pygtk] pixmap question...

[Rory Walsh]

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?

Rory.



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()