1: <?php
 2:   function configure_event($area, $event)
 3:   {
 4:       global  $pixmap; 
 5: 
 6:       $new_pixmap = &new GdkPixmap($event->window,
 7:                                    $event->width,
 8:                                    $event->height,
 9:                                    -1);
10:       if ($pixmap) {
11:           $new_pixmap->copy_area($area->style->white_gc, 0, 0, $pixmap, 0, 0,
12:                                  min($pixmap->width, $new_pixmap->width),
13:                                  min($pixmap->height, $new_pixmap->height));
14:       }
15:       $pixmap = $new_pixmap;
16:   }
17: ?>
Let your imagination run wild. For now, we'll draw a filled black rectangle. 

<?php
  gdk::draw_rectangle($pixmap, $area->style->black_gc, true, 10, 10, 100, 100);
?>
Some other drawing functions