coloring individual pixels

[Daniel Carrera <dcarrera math toronto edu>]

Just out of curiosity, are you trying to draw the Mandelbrot set? :-)

Look in the Gtk::reference manpage.

Maybe you could try  '$image->put_pixel($x,$y,$pixel)'

But I don't really know what kind of '$pixel' is supposed to take.

Maybe someone can tell us.

Daniel.


> Can someone help me out with an example?
>
> I want to color all the individual pixels in a pixmap according to
> some mathematical function, and I'm just confused as heck.
>
> Here's some snippets of non-working code which will hopefully give
> somewhat of an idea what I'm trying to do ...
>
> .... once I've set up my pixmap (which I don't have right! Ack!)
>
>    $gc = new Gtk::Gdk::GC ( $widget->window );
>    for ($x=0; $x<$width; $x++) {
>       for ($y=0; $y<$height; $y++) {
>          $gc->set_foreground($widget->window->get_colormap->color_alloc
>                              (f_color($x, $y)));
>          $pixmap->draw_point($widget->window, $gc, $x, $y);
>       }
>    }
>
> ....
>
> sub f_color {
>    my ($x, $y) = @_;
>    # this will eventually do some clever math thing, but
>    # returning just one color is fine for now.
>    return { red => 65000, green => 32500, blue => 0 };
> }
>
> I'm trying to go from the example at http://www.gtkperl.org/sample-chart.html,
> but that doesn't tell me how to work with individual pixels.
>
> Everything I'm trying is failing.  Any help would be most appreciated.
>
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