[cairo] gtk, cairo and surfaces
donn.ingle at gmail.com
Sat May 23 03:11:31 PDT 2009
Sorry if I am being thick, but I can't get anywhere with this. I am scraping
the net far and wide, so perhaps something will come-up.
I am using pygtk and python-cairo. I have a DrawingArea which gets an expose
event. In that event one draws stuff with a context; there is no hint of
where/what the surface is (I can't find any).
I want to output a png of what is being drawn to the window. Can anyone point
me in the right direction?
def _expose(self, widget, event):
self.context = widget.window.cairo_create()
Draw stuff to self.context ...
## I want a "copy" of the DrawingArea written out
## to a PNG file as well.
## This code writes blanks, not sure why:
out = cairo.ImageSurface(cairo.FORMAT_ARGB32,self.w,self.h)
ctxout = cairo.Context( out )
## Trying to 'capture' my self.context into a pattern.
ctxout.set_source( p )
out.write_to_png("somefile%d.png" % self.outpic )
self.outpic += 1
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