Re: Drawing area with different layers

[Chris <plutino gmail com>]

Thanks Tadej.  I spent some time reading cairo document and tried what
you suggested.  I store a cairo surface and use cario_paint to redraw
the surface.  The result, however, is the same as I did with
gdk_draw_drawable: the background is scribled.  The problem might be
that the drawing surface is not properly set to transparent.  Do you
know how to do that?

Bests,

- Chris

On Mon, Feb 28, 2011 at 9:34 AM, Tadej BorovÅak <tadeboro gmail com> wrote:
> Hello.
>
> > I'm new to gtk programming so this might be a very dummy question. ÂI
> > use a DrawingArea to draw a map with three layers: the background map,
> > the legend window, and app data. ÂSince the legend layer does not
> > change often, can I store it in a pixmap and simply copy it rather
> > than redraw it every time the map and app data change?
>
> I would suggest that you use cairo to do all of the drawing. Then you
> can "store" your drawings onto cairo surface and paint it when needed.
>
> Cheers,
> Tadej
>
>
> --
> Tadej BorovÅak
> tadeboro.blogspot.com
> tadeboro gmail com
> tadej borovsak gmail com