#!/usr/bin/perl

# <sjburges@gimp.org> (original release)
#
# 11/7/99 <brendy@swipnet.se>
# Added an option to remove existing guides
# Added progress bar.
# ** How can we force the display to update after adding guides? **
#
# 12/7/99 <sjburges@gimp.org>
# Changed the display code in C and got rid of ugly hack in perl.
#
use Gimp;
use Gimp::Fu;
use Gimp::Util;

# Gimp::set_trace(TRACE_ALL);

register "guide_grid",
  "GuideGrid - creates a grid of guides\n",
  "You specify the X spacing, the Y spacing, and initial offsets.  It creates a grid of guides\n",
  "Seth Burgess",
  "Seth Burgess <sjburges\@gimp.org>",
  "1999-03-20",
  N_"<Image>/Guides/Guide Grid",
  "*",
  [
   [PF_SPINNER, "x_spacing", "How far to space grid horizontally", 24, [1,1000,1]],
   [PF_SPINNER, "y_spacing", "How far to space grid vertically", 24, [1,1000,1]],
   [PF_SPINNER, "x_offset", "How much to initially offset it horizontally", 0, [0,1000,1]],
   [PF_SPINNER, "y_offset", "How much to initially offset it vertically", 0, [0,1000,1]],
   [PF_TOGGLE, "remove_old_guides", "Remove existing guides?", 0],
  ],
  [],
  ['gimp-1.1'],
  sub {
    my($img,$layer,$xspace, $yspace, $xoffset, $yoffset, $remove_old_guides) =@_;

    #
    # Remove all existing guides (this is optional)
    #    
    if($remove_old_guides) {
      $i=$img->find_next_guide(0);
      while ($i != 0) {
        $img->delete_guide($i);
        $i=$img->find_next_guide(0);
      }         
    }

    #
    # Add vertical guides to the image
    #
    for ($i=$xoffset; $i<$img->width; $i+=$xspace) {
      if ($i) {
	$img->add_vguide($i);
      }
    }
    
    #
    # Add horizontal guides to the image
    #
    for ($i=$yoffset; $i<$img->height; $i+=$yspace) {
      if ($i) {
	$img->add_hguide($i);
      }
    }
    
    # 
    # I fixed this in Gimp C code (it wasn't flushing guides properly) 
    # Seth Burgess <sjburges@gimp.org>
    #

    ##
    ## Refresh the display (probably not good, works for me!)
    ##
    ##
    #$img->selection_all();
    #$img->selection_none();

    $layer->update(0, 0, $img->height, $img->width);

    return();
  };
exit main;