> > If you're doing something like rubber banding, you can use Xor
> > drawing.
> >
>
> Has anyone written the code to do this? I would like to select
> regions from an xyplot, and I am relatively lazy, uh, I mean I don't
> want to "reinvent the wheel", so...
Basically, the idea is
fl_drawmode( GXxor );
if ( !first_time_through )
draw_the_old_box();
draw_the_new_box();
fl_drawmode( GXcopy );
That's it.
You may need to experiment with the color to get it right. I
generally would set the GC's foreground color to 0xff.
There is an Xlib oriented discussion of this in Volume I of the
O'Reilly series -- I think under the topic of "rubber banding."
I actually don't bother with the Xor drawing much any more. I just
double buffer and redraw the entire object with a new box. Most
systems are fast enough these days that there's very little noticable
lag.
spl
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