Re: gtk drawing: simple layers

[Roland Smith <rsmith xs4all nl>]

On Mon, 08 Apr 2002 14:00:26 -0400
Allin Cottrell <cottrell@wfu.edu> wrote:

> I have a pixmap displayed in a gdk window.  Now I'd
> like to superimpose a rectangle to give the user
> feedback on the area she has selected with a mouse
> drag -- a 'wire frame' rectangle that doesn't cover
> up the pixmap.

Set the GC to XOR with gdk_gc_set_function (gc, GDK_XOR) and draw a white or
black line.

Draw it again on the same position to make it disappear again. :)

Roland
-- 
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r s m i t h @ x s 4 a l l . n l     because I lack the time to make it shorter"
http://www.xs4all.nl/~rsmith/                             -- Blaise Pascal
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