draw_bitmap (ps, &image),
{
  image = {
            bitmap : background_bitmap,
            style : DB_TILE | DB_LEFT | DB_BOTTOM,
            from : { x, y : 0, cx : bitmap_width, cy : bitmap_height },
            to : { x : point.x, y : point.y, cx : bitmap_width, cy : bitmap_height }
          }
};