Re: flood fills

[Tristan Van Berkom <vantr touchtunes com>]

        I guess I'm replying this purly
out of interest. I dont know of a function
that does this (but there is probably
a method; once you browse the gimp code
you'll find it somewhere).

        But I did an exersize like that
once for fun. the tough part is that you can
do it really simply and optimized if the shape
is non-concave. otherwise what I came up 
with was something like this:

void func(x, y, color, delimiter) 
{
        draw(x, y, color)

        if ( get_color(x+1,y) != color &&
           ( get_color(x+1,y) != delimiter ) {
                func(x+1, y, color, delimiter);
        }
        /* and repeat the procedure
           for the other 7 surounding 
           points
         */
}

Have fun coding this one!
                -Tristan

Bryan Brown wrote:
> I've almost finished the first Linux beta version of my application
> (ported from the Amiga), and the final thing I need is a function to flood
> fill a demarcated region of somewhat arbitrary shape in a drawing area.
>
> The Amiga has/had a built in function to flood fill a bounded region in a
> window with a user-specified color, the input being the RastPort ID and
> the screen coordinates of a point within the region.  It worked
> wonderfully, even for the most bizarre and convoluted shapes I tried it
> on.  Unfortunately I don't have the algorithm it used.
>
> The closest analog I can find in Gtk is to specify a flood fill flag when
> drawing a closed figure using a set of points, but nothing about filling
> an already-drawn figure.
>
> Is there a Gtk function that I've missed that will do this?
>
> In the absence of such a Gtk function I've written my own rather
> unsophisticated function to do it, but it doesn't completely fill regions
> of arbitrary shape in one swell foop the way the Amiga did.
>
> Thanks,
>
> Bryan
>
> *---------------------------------------------------------------
> * Bryan Brown      <*>              bbrown radix net
> * http://www.radix.net/~bbrown
> *---------------------------------------------------------------
>
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