Re: the right way to draw in a drawingarea
- From: Paul Davis <pjdavis engineering uiowa edu>
- To: "Foster, Gareth" <gareth foster siemens com>
- Cc: gtkmm-list gnome org
- Subject: Re: the right way to draw in a drawingarea
- Date: Tue, 11 Oct 2005 05:11:46 -0500
Foster, Gareth wrote:
This is a point I am completely unsure about. I haven't the foggiest on
Gtk internals and the ramifications of a simple call such as
draw_rectangle. I've used double buffering in both OpenGL and Java.
I've just never really seen any real reference to it in gtk. Now that
I've had a couple beers, I seem to rememeber some reference to getting
an offscreen graphics context, drawing to that, and then switching the
main gc with it back and forth. But I could be completely making that
up. ( the beer )
the display flickers, even when drawing a simple square.
Doesn't this often mean you need to be double buffering?
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gtkmm-list gnome org
Double buffering isn't really that hard of a concept. I'm just not sure
of if its needed. Because its more than possible that gtk has its own
buffering scheme burried somewhere. I've actually written a couple
programs to animate image data using Gtkmm. I've never had a problem
with flickering that wasn't because I was doing something silly like
clearing and then redrawing. So the answer is I dunno. Its possible.
If I get time I'll write a test program to try and play with the idea.
And if I had thought to take a moment to google something as silly as
gtkmm double buffering, I would have noticed that the gtkmm docs specify
that widgets are double buffered by default. In which case, no double
buffering will not solve this problem cause its already being done.
Which goes to show that yes, I was making up the graphics context
thing. Must be something from java I was thinking of.
In other news, Unleashed wasn't half bad if anyone cares.
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