gimp/app/dialogs/resize-dialog.c

/* The GIMP -- an image manipulation program
 * Copyright (C) 1995 Spencer Kimball and Peter Mattis
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */
#include <math.h>
#include "appenv.h"
#include "resize.h"
#include "actionarea.h"
#include "gimprc.h"

#include "libgimp/gimpchainbutton.h"
#include "libgimp/gimpsizeentry.h"
#include "libgimp/gimpintl.h"

#define EVENT_MASK  GDK_EXPOSURE_MASK | GDK_BUTTON_PRESS_MASK
#define DRAWING_AREA_SIZE 200
#define TEXT_WIDTH 35

typedef struct _ResizePrivate ResizePrivate;

struct _ResizePrivate
{
  /*  size frame  */
  GtkWidget *orig_width_label;
  GtkWidget *orig_height_label;

  GtkWidget *size_se;

  GtkObject *ratio_x_adj;
  GtkObject *ratio_y_adj;
  GtkWidget *constrain;

  /*  offset frame  */
  GtkWidget *offset_se;
  GtkWidget *drawing_area;

  /*  resolution frame  */
  GtkWidget *printsize_se;
  GtkWidget *resolution_se;
  GtkWidget *equal_res;

  GtkObject *object;
  guint      object_destroy_handler;

  double ratio;
  int old_width, old_height;
  int old_res_x, old_res_y;
  int area_width, area_height;
  int start_x, start_y;
  int orig_x, orig_y;
};

static void resize_draw (Resize *);
static int  resize_bound_off_x (Resize *, int);
static int  resize_bound_off_y (Resize *, int);
static void offset_update (GtkWidget *w, gpointer data);
static void size_update (GtkWidget *w, gpointer data);
static void unit_update (GtkWidget *w, gpointer data);
static void ratio_update (GtkWidget *w, gpointer data);
static void printsize_update (GtkWidget *w, gpointer data);
static void resolution_update (GtkWidget *w, gpointer data);
static gint resize_events (GtkWidget *area, GdkEvent *event);


Resize *
resize_widget_new (ResizeType    type,
		   ResizeTarget  target,
		   GtkObject    *object,
		   int           width,
		   int           height,
		   float         resolution_x,
		   float         resolution_y,
		   GUnit         unit,
		   gboolean      dot_for_dot,
		   GtkSignalFunc ok_cb,
		   GtkSignalFunc cancel_cb,
		   gint        (*delete_cb) (GtkWidget *,
					     GdkEvent *,
					     gpointer),
		   gpointer      user_data)
{
  static ActionAreaItem action_items[2] =
  {
    { N_("OK"), NULL, NULL, NULL },
    { N_("Cancel"), NULL, NULL, NULL }
  };
  Resize *resize;
  ResizePrivate *private;
  GtkWidget *vbox;
  GtkWidget *vbox2;
  GtkWidget *table;
  GtkWidget *table2;
  GtkWidget *hbox;
  GtkWidget *label;
  GtkWidget *frame;
  GtkWidget *spinbutton;
  GtkWidget *alignment;
  GtkObject *adjustment;

  alignment = NULL;
  frame = NULL;

  resize = g_new (Resize, 1);
  private = g_new (ResizePrivate, 1);
  resize->type = type;
  resize->target = target;
  resize->private_part = private;
  resize->width = width;
  resize->height = height;
  resize->resolution_x = resolution_x;
  resize->resolution_y = resolution_y;
  resize->unit = unit;
  resize->ratio_x = 1.0;
  resize->ratio_y = 1.0;
  resize->offset_x = 0;
  resize->offset_y = 0;
  private->old_width = width;
  private->old_height = height;
  private->old_res_x = resolution_x;
  private->old_res_y = resolution_y;
  private->object = NULL;

  /*  Get the image width and height variables, based on the gimage  */
  if (width > height)
    private->ratio = (double) DRAWING_AREA_SIZE / (double) width;
  else
    private->ratio = (double) DRAWING_AREA_SIZE / (double) height;
  private->area_width = (int) (private->ratio * width);
  private->area_height = (int) (private->ratio * height);

  /* dialog box */
  {
    const char *wmclass = NULL;
    const char *window_title = NULL;

    switch (type) {
    case ScaleWidget:
	switch (target) {
	case ResizeLayer:
	    wmclass = "scale_layer";
	    window_title = _("Scale Layer");
	    frame = gtk_frame_new (_("Size"));
	    break;
	case ResizeImage:
	    wmclass = "image_scale";
	    window_title = _("Image Scale");
	    frame = gtk_frame_new (_("Pixel Dimensions & Image Unit"));
	    break;
	}
	break;

    case ResizeWidget:
	switch (target) {
	case ResizeLayer:
	    wmclass = "resize_layer";
	    window_title = _("Resize Layer");
	    break;
	case ResizeImage:
	    wmclass = "image_resize";
	    window_title = _("Image Resize");
	    break;
	}
	frame = gtk_frame_new (_("Size"));
	break;
    }	

    resize->resize_shell = gtk_dialog_new ();
    gtk_window_set_wmclass (GTK_WINDOW (resize->resize_shell), wmclass,"Gimp");
    gtk_window_set_title (GTK_WINDOW (resize->resize_shell), window_title);
    gtk_window_set_policy(GTK_WINDOW (resize->resize_shell), FALSE,FALSE,TRUE);
    gtk_window_position (GTK_WINDOW (resize->resize_shell), GTK_WIN_POS_MOUSE);
  }

  /*  handle the wm close singal  */
  if (delete_cb)
    gtk_signal_connect (GTK_OBJECT (resize->resize_shell), "delete_event",
			GTK_SIGNAL_FUNC (delete_cb), user_data);

  /*  handle the image disappearing under our feet  */
  if (object)
  {
    const char *signame;
    signame = (target == ResizeLayer) ? "removed" : "destroy";
    private->object = object;
    private->object_destroy_handler =
      gtk_signal_connect(GTK_OBJECT (object), signame, cancel_cb, user_data);
  }

  /*  the main vbox  */
  vbox = gtk_vbox_new (FALSE, 2);
  gtk_container_set_border_width (GTK_CONTAINER (vbox), 4);
  gtk_container_add (GTK_CONTAINER (GTK_DIALOG (resize->resize_shell)->vbox),
		     vbox);

  /*  the pixel dimensions frame  */
  gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
  gtk_widget_show (frame);

  vbox2 = gtk_vbox_new (FALSE, 2);
  gtk_container_set_border_width (GTK_CONTAINER (vbox2), 2);
  gtk_container_add (GTK_CONTAINER (frame), vbox2);

  table = gtk_table_new (6, 2, FALSE);
  gtk_container_set_border_width (GTK_CONTAINER (table), 2);
  gtk_table_set_col_spacing (GTK_TABLE (table), 0, 4);
  gtk_table_set_row_spacing (GTK_TABLE (table), 0, 4);
  gtk_table_set_row_spacing (GTK_TABLE (table), 1, 4);
  gtk_table_set_row_spacing (GTK_TABLE (table), 3, 4);
  gtk_table_set_row_spacing (GTK_TABLE (table), 4, 2);
  gtk_box_pack_start (GTK_BOX (vbox2), table, FALSE, FALSE, 0);

  /*  the original width & height labels  */
  label = gtk_label_new (_("Original Width:"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
  gtk_table_attach (GTK_TABLE (table), label, 0, 1, 0, 1,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
  gtk_widget_show (label);

  label = gtk_label_new (_("Height:"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
  gtk_table_attach (GTK_TABLE (table), label, 0, 1, 1, 2,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
  gtk_widget_show (label);

  private->orig_width_label = gtk_label_new ("");
  gtk_misc_set_alignment (GTK_MISC ( private->orig_width_label), 0.0, 0.5);
  gtk_table_attach (GTK_TABLE (table),  private->orig_width_label, 1, 2, 0, 1,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
  gtk_widget_show ( private->orig_width_label);

  private->orig_height_label = gtk_label_new ("");
  gtk_misc_set_alignment (GTK_MISC (private->orig_height_label), 0.0, 0.5);
  gtk_table_attach (GTK_TABLE (table), private->orig_height_label, 1, 2, 1, 2,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
  gtk_widget_show (private->orig_height_label);

  /*  the size sizeentry  */
  label = gtk_label_new (_("New Width:"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
  gtk_table_attach (GTK_TABLE (table), label, 0, 1, 2, 3,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
  gtk_widget_show (label);

  label = gtk_label_new (_("Height:"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
  gtk_table_attach (GTK_TABLE (table), label, 0, 1, 3, 4,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
  gtk_widget_show (label);

  adjustment = gtk_adjustment_new (1, 1, 1, 1, 10, 1);
  spinbutton = gtk_spin_button_new (GTK_ADJUSTMENT (adjustment), 1, 2);
  gtk_spin_button_set_shadow_type (GTK_SPIN_BUTTON (spinbutton),
                                   GTK_SHADOW_NONE);
  gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (spinbutton), TRUE);
  gtk_widget_set_usize (spinbutton, 75, 0);

  private->size_se =
    gimp_size_entry_new (1, dot_for_dot ? UNIT_PIXEL : unit, "%a",
			 TRUE, TRUE, FALSE, 75,
			 GIMP_SIZE_ENTRY_UPDATE_SIZE);
  gimp_size_entry_add_field (GIMP_SIZE_ENTRY (private->size_se),
			     GTK_SPIN_BUTTON (spinbutton), NULL);
  gtk_table_attach_defaults (GTK_TABLE (private->size_se), spinbutton,
			     1, 2, 0, 1);
  gtk_widget_show (spinbutton);
  gtk_table_attach (GTK_TABLE (table), private->size_se, 1, 2, 2, 4,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
  gtk_widget_show (private->size_se);

  gimp_size_entry_set_refval_boundaries (GIMP_SIZE_ENTRY (private->size_se), 0, 1, 65536);
  gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (private->size_se), 0,
				  resolution_x, FALSE);
  gimp_size_entry_set_size (GIMP_SIZE_ENTRY (private->size_se), 0,
			    0, width);
  gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->size_se), 0,
			      width);

  gimp_size_entry_set_refval_boundaries (GIMP_SIZE_ENTRY (private->size_se), 1, 1, 65536);
  gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (private->size_se), 1,
				  resolution_x, FALSE);
  gimp_size_entry_set_size (GIMP_SIZE_ENTRY (private->size_se), 1,
			    0, height);
  gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->size_se), 1,
			      height);

  gtk_signal_connect (GTK_OBJECT (private->size_se), "value_changed",
		      (GtkSignalFunc) size_update,
		      resize);
  gtk_signal_connect (GTK_OBJECT (private->size_se), "refval_changed",
		      (GtkSignalFunc) size_update,
		      resize);
  gtk_signal_connect (GTK_OBJECT (private->size_se), "unit_changed",
		      (GtkSignalFunc) unit_update,
		      resize);

  /*  initialize the original width & height labels  */
  unit_update (private->size_se, resize);

  /*  the scale ratio labels and spinbuttons  */
  label = gtk_label_new (_("Ratio X:"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
  gtk_table_attach (GTK_TABLE (table), label, 0, 1, 4, 5,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
  gtk_widget_show (label);

  label = gtk_label_new (_("Y:"));
  gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
  gtk_table_attach (GTK_TABLE (table), label, 0, 1, 5, 6,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
  gtk_widget_show (label);

  alignment = gtk_alignment_new (0.0, 0.5, 0.0, 1.0);
  table2 = gtk_table_new (2, 2, FALSE);
  gtk_table_set_col_spacing (GTK_TABLE (table2), 0, 2);
  gtk_container_add (GTK_CONTAINER (alignment), table2);
  gtk_table_attach (GTK_TABLE (table), alignment, 1, 2, 4, 6,
		    GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
  gtk_widget_show (alignment);
  
  private->ratio_x_adj =
    gtk_adjustment_new (resize->ratio_x, 0.0001, 10000, 0.01, 0.1, 1);
  spinbutton = gtk_spin_button_new (GTK_ADJUSTMENT (private->ratio_x_adj), 1, 4);
  gtk_spin_button_set_shadow_type (GTK_SPIN_BUTTON (spinbutton),
                                   GTK_SHADOW_NONE);
  gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (spinbutton), TRUE);
  gtk_widget_set_usize (spinbutton, 75, 0);
  gtk_table_attach_defaults (GTK_TABLE (table2), spinbutton, 0, 1, 0, 1);
  gtk_signal_connect (GTK_OBJECT ( private->ratio_x_adj), "value_changed",
		      (GtkSignalFunc) ratio_update,
		      resize);
  gtk_widget_show (spinbutton);

  private->ratio_y_adj =
    gtk_adjustment_new (resize->ratio_y, 0.0001, 10000, 0.01, 0.1, 1);
  spinbutton = gtk_spin_button_new (GTK_ADJUSTMENT (private->ratio_y_adj), 1, 4);
  gtk_spin_button_set_shadow_type (GTK_SPIN_BUTTON (spinbutton),
                                   GTK_SHADOW_NONE);
  gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (spinbutton), TRUE);
  gtk_widget_set_usize (spinbutton, 75, 0);
  gtk_table_attach_defaults (GTK_TABLE (table2), spinbutton, 0, 1, 1, 2);
  gtk_signal_connect (GTK_OBJECT ( private->ratio_y_adj), "value_changed",
		      (GtkSignalFunc) ratio_update,
		      resize);
  gtk_widget_show (spinbutton);

  private->constrain = gimp_chain_button_new (GIMP_CHAIN_RIGHT);
  gimp_chain_button_set_active (GIMP_CHAIN_BUTTON (private->constrain), TRUE);
  gtk_table_attach_defaults (GTK_TABLE (table2), private->constrain, 1, 2, 0, 2);
  gtk_widget_show (private->constrain);

  gtk_widget_show (table2);
  gtk_widget_show (table);
  gtk_widget_show (vbox2);

  /*  the offset frame  */
  if (type == ResizeWidget)
    {
      frame = gtk_frame_new (_("Offset"));
      gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
      gtk_widget_show (frame);

      hbox = gtk_hbox_new (FALSE, 0);
      gtk_container_set_border_width (GTK_CONTAINER (hbox), 2);
      gtk_container_add (GTK_CONTAINER (frame), hbox);

      vbox2 = gtk_vbox_new (FALSE, 2);
      gtk_container_set_border_width (GTK_CONTAINER (vbox2), 2);
      gtk_box_pack_start (GTK_BOX (hbox), vbox2, TRUE, FALSE, 0);

      table = gtk_table_new (2, 2, FALSE);
      gtk_table_set_col_spacing (GTK_TABLE (table), 0, 4);
      gtk_box_pack_start (GTK_BOX (vbox2), table, FALSE, FALSE, 0);
 
      label = gtk_label_new (_("X:"));
      gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
      gtk_table_attach (GTK_TABLE (table), label, 0, 1, 0, 1,
			GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
      gtk_widget_show (label);

      label = gtk_label_new (_("Y:"));
      gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
      gtk_table_attach (GTK_TABLE (table), label, 0, 1, 1, 2,
			GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
      gtk_widget_show (label);

      adjustment = gtk_adjustment_new (1, 1, 1, 1, 10, 1);
      spinbutton = gtk_spin_button_new (GTK_ADJUSTMENT (adjustment), 1, 2);
      gtk_spin_button_set_shadow_type (GTK_SPIN_BUTTON (spinbutton),
				       GTK_SHADOW_NONE);
      gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (spinbutton), TRUE);
      gtk_widget_set_usize (spinbutton, 75, 0);

      private->offset_se =
	gimp_size_entry_new (1, dot_for_dot ? UNIT_PIXEL : unit, "%a",
			     TRUE, FALSE, FALSE, 75,
			     GIMP_SIZE_ENTRY_UPDATE_SIZE);
      gimp_size_entry_add_field (GIMP_SIZE_ENTRY (private->offset_se),
				 GTK_SPIN_BUTTON (spinbutton), NULL);
      gtk_table_attach_defaults (GTK_TABLE (private->offset_se), spinbutton,
				 1, 2, 0, 1);
      gtk_widget_show (spinbutton);
      gtk_table_attach (GTK_TABLE (table), private->offset_se, 1, 2, 0, 2,
			GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
      gtk_widget_show (private->offset_se);

      gimp_size_entry_set_refval_boundaries
	(GIMP_SIZE_ENTRY (private->offset_se), 0, 0, 0);
      gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (private->offset_se), 0,
				      resolution_x, FALSE);
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->offset_se), 0, 0);

      gimp_size_entry_set_refval_boundaries
	(GIMP_SIZE_ENTRY (private->offset_se), 1, 0, 0);
      gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (private->offset_se), 1,
				      resolution_x, FALSE);
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->offset_se), 1, 0);

      gtk_signal_connect (GTK_OBJECT (private->offset_se),
			  "value_changed", (GtkSignalFunc) offset_update,
			  resize);
      gtk_signal_connect (GTK_OBJECT (private->offset_se),
			  "refval_changed", (GtkSignalFunc) offset_update,
			  resize);

      gtk_widget_show (table);

      /*  frame to hold drawing area  */
      frame = gtk_frame_new (NULL);
      gtk_frame_set_shadow_type (GTK_FRAME (frame), GTK_SHADOW_IN);
      gtk_box_pack_start (GTK_BOX (vbox2), frame, TRUE, FALSE, 0);
      private->drawing_area = gtk_drawing_area_new ();
      gtk_drawing_area_size (GTK_DRAWING_AREA (private->drawing_area),
			     private->area_width, private->area_height);
      gtk_widget_set_events (private->drawing_area, EVENT_MASK);
      gtk_signal_connect (GTK_OBJECT (private->drawing_area), "event",
			  (GtkSignalFunc) resize_events,
			  NULL);
      gtk_object_set_user_data (GTK_OBJECT (private->drawing_area), resize);
      gtk_container_add (GTK_CONTAINER (frame), private->drawing_area);
      gtk_widget_show (private->drawing_area);
      gtk_widget_show (frame);

      gtk_widget_show (vbox2);
      gtk_widget_show (hbox);
    }

  /*  the resolution stuff  */
  if ((type == ScaleWidget) && (target == ResizeImage))
    {
      frame = gtk_frame_new (_("Print Size"));
      gtk_box_pack_start (GTK_BOX (vbox), frame, FALSE, FALSE, 0);
      gtk_widget_show (frame);

      vbox2 = gtk_vbox_new (FALSE, 2);
      gtk_container_set_border_width (GTK_CONTAINER (vbox2), 2);
      gtk_container_add (GTK_CONTAINER (frame), vbox2);

      table = gtk_table_new (4, 2, FALSE);
      gtk_table_set_col_spacing (GTK_TABLE (table), 0, 4);
      gtk_table_set_row_spacing (GTK_TABLE (table), 1, 4);
      gtk_box_pack_start (GTK_BOX (vbox2), table, FALSE, FALSE, 0);

      /*  the print size sizeentry  */
      label = gtk_label_new (_("New Width:"));
      gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
      gtk_table_attach (GTK_TABLE (table), label, 0, 1, 0, 1,
			GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
      gtk_widget_show (label);

      label = gtk_label_new (_("Height:"));
      gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
      gtk_table_attach (GTK_TABLE (table), label, 0, 1, 1, 2,
			GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
      gtk_widget_show (label);

      alignment = gtk_alignment_new (0.0, 0.5, 0.0, 1.0);
      adjustment = gtk_adjustment_new (1, 1, 1, 1, 10, 1);
      spinbutton = gtk_spin_button_new (GTK_ADJUSTMENT (adjustment), 1, 2);
      gtk_spin_button_set_shadow_type (GTK_SPIN_BUTTON (spinbutton),
				       GTK_SHADOW_NONE);
      gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (spinbutton), TRUE);
      gtk_widget_set_usize (spinbutton, 75, 0);
      gtk_container_add (GTK_CONTAINER (alignment), spinbutton);
      gtk_widget_show (spinbutton);
      gtk_table_attach (GTK_TABLE (table), alignment, 1, 2, 0, 1,
			GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
      gtk_widget_show (alignment);

      alignment = gtk_alignment_new (0.0, 0.5, 0.0, 1.0);
      private->printsize_se =
	gimp_size_entry_new (1, unit, "%a", FALSE, FALSE, FALSE, 75,
			     GIMP_SIZE_ENTRY_UPDATE_SIZE);
      gimp_size_entry_add_field (GIMP_SIZE_ENTRY (private->printsize_se),
				 GTK_SPIN_BUTTON (spinbutton), NULL);
      gtk_container_add (GTK_CONTAINER (alignment), private->printsize_se);
      gtk_table_attach (GTK_TABLE (table), alignment, 1, 2, 1, 2,
			GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
      gtk_widget_show (private->printsize_se);
      gtk_widget_show (alignment);

      gimp_size_entry_set_refval_boundaries
	(GIMP_SIZE_ENTRY (private->printsize_se), 0, 1, 65536);
      gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (private->printsize_se),
				      0, resolution_x, FALSE);
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->printsize_se),
				  0, resize->width);
      gimp_size_entry_set_refval_boundaries
	(GIMP_SIZE_ENTRY (private->printsize_se), 1, 1, 65536);
      gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (private->printsize_se),
				      1, resolution_x, FALSE);
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->printsize_se),
				  1, resize->height);

      gtk_signal_connect (GTK_OBJECT (private->printsize_se),
			  "value_changed", (GtkSignalFunc) printsize_update,
			  resize);
      gtk_signal_connect (GTK_OBJECT (private->printsize_se),
			  "refval_changed", (GtkSignalFunc) printsize_update,
			  resize);
      
      /*  the resolution sizeentry  */
      label = gtk_label_new (_("Resolution X:"));
      gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
      gtk_table_attach (GTK_TABLE (table), label, 0, 1, 2, 3,
			GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
      gtk_widget_show (label);

      label = gtk_label_new (_("Y:"));
      gtk_misc_set_alignment (GTK_MISC (label), 1.0, 0.5);
      gtk_table_attach (GTK_TABLE (table), label, 0, 1, 3, 4,
			GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
      gtk_widget_show (label);

      adjustment = gtk_adjustment_new (1, 1, 1, 1, 10, 1);
      spinbutton = gtk_spin_button_new (GTK_ADJUSTMENT (adjustment), 1, 2);
      gtk_spin_button_set_shadow_type (GTK_SPIN_BUTTON (spinbutton),
				       GTK_SHADOW_NONE);
      gtk_spin_button_set_numeric (GTK_SPIN_BUTTON (spinbutton), TRUE);
      gtk_widget_set_usize (spinbutton, 75, 0);

      private->resolution_se =
	gimp_size_entry_new (1, default_resolution_units, "pixels/%a",
			     FALSE, FALSE, FALSE, 75,
			     GIMP_SIZE_ENTRY_UPDATE_RESOLUTION);
      gtk_table_set_col_spacing (GTK_TABLE (private->resolution_se), 1, 2);
      gtk_table_set_col_spacing (GTK_TABLE (private->resolution_se), 2, 2);
      gimp_size_entry_add_field (GIMP_SIZE_ENTRY (private->resolution_se),
				 GTK_SPIN_BUTTON (spinbutton), NULL);
      gtk_table_attach_defaults (GTK_TABLE (private->resolution_se), spinbutton,
				 1, 2, 0, 1);
      gtk_widget_show (spinbutton);
      gtk_table_attach (GTK_TABLE (table), private->resolution_se, 1, 2, 2, 4,
			GTK_SHRINK | GTK_FILL, GTK_SHRINK | GTK_FILL, 0, 0);
      gtk_widget_show (private->resolution_se);

      gimp_size_entry_set_refval_boundaries
	(GIMP_SIZE_ENTRY (private->resolution_se), 0, 1e-5, 65536);
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->resolution_se),
				  0, resize->resolution_x);
      gimp_size_entry_set_refval_boundaries
	(GIMP_SIZE_ENTRY (private->resolution_se), 1, 1e-5, 65536);
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->resolution_se),
				  1, resize->resolution_y);

      gtk_signal_connect (GTK_OBJECT (private->resolution_se),
			  "value_changed", (GtkSignalFunc) resolution_update,
			  resize);
      gtk_signal_connect (GTK_OBJECT (private->resolution_se),
			  "refval_changed", (GtkSignalFunc) resolution_update,
			  resize);

      private->equal_res = gimp_chain_button_new (GIMP_CHAIN_RIGHT);
      gimp_chain_button_set_active
	(GIMP_CHAIN_BUTTON (private->equal_res),
	 ABS (resize->resolution_x - resize->resolution_y) < 1e-5);
      gtk_table_attach_defaults (GTK_TABLE (private->resolution_se),
				 private->equal_res, 2, 3, 0, 2);
      gtk_widget_show (private->equal_res);

      gtk_widget_show (table);
      gtk_widget_show (vbox2);
    }

  gtk_widget_show (vbox);

  action_items[0].user_data = user_data;
  action_items[0].callback  = ok_cb;
  action_items[1].user_data = user_data;
  action_items[1].callback  = cancel_cb;
  build_action_area (GTK_DIALOG (resize->resize_shell), action_items, 2, 0);

  return resize;
}

void
resize_widget_free (Resize *resize)
{
  ResizePrivate *private = resize->private_part;

  if (private->object)
    gtk_signal_disconnect (GTK_OBJECT (private->object),
			   private->object_destroy_handler);

  gtk_widget_destroy (resize->resize_shell);
  g_free (resize->private_part);
  g_free (resize);
}

static void
resize_draw (Resize *resize)
{
  GtkWidget *widget;
  ResizePrivate *private;
  int aw, ah;
  int x, y;
  int w, h;

  /*  Only need to draw if it's a resize widget  */
  if (resize->type != ResizeWidget)
    return;

  private = (ResizePrivate *) resize->private_part;
  widget = private->drawing_area;

  /*  If we're making the size larger  */
  if (private->old_width <= resize->width)
    w = resize->width;
  /*  otherwise, if we're making the size smaller  */
  else
    w = private->old_width * 2 - resize->width;
  /*  If we're making the size larger  */
  if (private->old_height <= resize->height)
    h = resize->height;
  /*  otherwise, if we're making the size smaller  */
  else
    h = private->old_height * 2 - resize->height;

  if (w > h)
    private->ratio = (double) DRAWING_AREA_SIZE / (double) w;
  else
    private->ratio = (double) DRAWING_AREA_SIZE / (double) h;

  aw = (int) (private->ratio * w);
  ah = (int) (private->ratio * h);

  if (aw != private->area_width || ah != private->area_height)
    {
      private->area_width = aw;
      private->area_height = ah;
      gtk_widget_set_usize (private->drawing_area, aw, ah);
    }

  if (private->old_width <= resize->width)
    x = private->ratio * resize->offset_x;
  else
    x = private->ratio * (resize->offset_x + private->old_width - resize->width);
  if (private->old_height <= resize->height)
    y = private->ratio * resize->offset_y;
  else
    y = private->ratio * (resize->offset_y + private->old_height - resize->height);

  w = private->ratio * private->old_width;
  h = private->ratio * private->old_height;

  gdk_window_clear (private->drawing_area->window);
  gtk_draw_shadow (widget->style, widget->window,
		   GTK_STATE_NORMAL, GTK_SHADOW_OUT,
		   x, y, w, h);

  /*  If we're making the size smaller  */
  if (private->old_width > resize->width ||
      private->old_height > resize->height)
    {
      if (private->old_width > resize->width)
	{
	  x = private->ratio * (private->old_width - resize->width);
	  w = private->ratio * resize->width;
	}
      else
	{
	  x = -1;
	  w = aw + 2;
	}
      if (private->old_height > resize->height)
	{
	  y = private->ratio * (private->old_height - resize->height);
	  h = private->ratio * resize->height;
	}
      else
	{
	  y = -1;
	  h = ah + 2;
	}

      gdk_draw_rectangle (private->drawing_area->window,
			  widget->style->black_gc, 0,
			  x, y, w, h);
    }
}

static int
resize_bound_off_x (Resize *resize,
		    int     off_x)
{
  ResizePrivate *private;

  private = (ResizePrivate *) resize->private_part;

  if (private->old_width <= resize->width)
    off_x = BOUNDS (off_x, 0, (resize->width - private->old_width));
  else
    off_x = BOUNDS (off_x, (resize->width - private->old_width), 0);

  return off_x;
}

static int
resize_bound_off_y (Resize *resize,
		    int     off_y)
{
  ResizePrivate *private;

  private = (ResizePrivate *) resize->private_part;

  if (private->old_height <= resize->height)
    off_y = BOUNDS (off_y, 0, (resize->height - private->old_height));
  else
    off_y = BOUNDS (off_y, (resize->height - private->old_height), 0);

  return off_y;
}

static void
unit_update (GtkWidget *w,
	     gpointer   data)
{
  Resize *resize;
  ResizePrivate *private;
  GUnit unit;
  float unit_factor;
  gchar format_buf[16];
  gchar buf[32];

  static GUnit label_unit = UNIT_PIXEL;

  resize = (Resize *) data;
  private = (ResizePrivate *) resize->private_part;

  unit = gimp_size_entry_get_unit (GIMP_SIZE_ENTRY (w));

  if ((unit != UNIT_PIXEL) && (unit != UNIT_PERCENT))
    resize->unit = unit;

  if (unit != UNIT_PERCENT)
    label_unit = unit;

  unit_factor = gimp_unit_get_factor (label_unit);
  
  if (label_unit) /* unit != UNIT_PIXEL */
    {
      g_snprintf (format_buf, 16, "%%.%df %s",
                  gimp_unit_get_digits (label_unit) + 1,
                  gimp_unit_get_symbol (label_unit));
      g_snprintf (buf, 32, format_buf,
                  private->old_width * unit_factor / private->old_res_x);
      gtk_label_set_text (GTK_LABEL (private->orig_width_label), buf);
      g_snprintf (buf, 32, format_buf,
                  private->old_height * unit_factor / private->old_res_y);
      gtk_label_set_text (GTK_LABEL (private->orig_height_label), buf);
    }
  else /* unit == UNIT_PIXEL */
    {
      g_snprintf (buf, 32, "%d", private->old_width);
      gtk_label_set_text (GTK_LABEL (private->orig_width_label), buf);
      g_snprintf (buf, 32, "%d", private->old_height);
      gtk_label_set_text (GTK_LABEL (private->orig_height_label), buf);
    }
}

static void
offset_update (GtkWidget *w,
	       gpointer   data)
{
  Resize *resize;
  ResizePrivate *private;
  int offset_x;
  int offset_y;

  resize = (Resize *) data;
  private = (ResizePrivate *) resize->private_part;

  offset_x =
    gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (private->offset_se), 0);
  offset_x = resize_bound_off_x (resize, offset_x);

  offset_y =
    gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (private->offset_se), 1);
  offset_y = resize_bound_off_y (resize, offset_y);

  if ((offset_x != resize->offset_x) ||
      (offset_y != resize->offset_y))
    {
      resize->offset_x = offset_x;
      resize->offset_y = offset_y;
      resize_draw (resize);
    }
}

static void
size_update (GtkWidget *w,
	     gpointer   data)
{
  Resize *resize;
  ResizePrivate *private;
  int width;
  int height;
  double ratio_x = 1.0;
  double ratio_y = 1.0;

  resize = (Resize *) data;
  private = (ResizePrivate *) resize->private_part;

  width = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (private->size_se), 0);
  height = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (private->size_se), 1);

  ratio_x = (double) width / (double) private->old_width;
  ratio_y = (double) height / (double) private->old_height;

  if (gimp_chain_button_get_active (GIMP_CHAIN_BUTTON (private->constrain)))
    {
      if (width != resize->width)
	{
	  ratio_y = ratio_x;
	  height = (int) (private->old_height * ratio_y);
	  if (height == 0) height = 1;
	}
      else
	{
	  ratio_x = ratio_y;
	  width = (int) (private->old_width * ratio_x);
	  if (width == 0) width = 1;
	}
    }
  
  resize->width = width;
  gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->size_se), 0, width);
  resize->height = height;
  gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->size_se), 1, height);

  resize->ratio_x = ratio_x;
  gtk_signal_handler_block_by_data (GTK_OBJECT (private->ratio_x_adj), data);
  gtk_adjustment_set_value (GTK_ADJUSTMENT (private->ratio_x_adj), ratio_x);
  gtk_signal_handler_unblock_by_data (GTK_OBJECT (private->ratio_x_adj), data);
  resize->ratio_y = ratio_y;
  gtk_signal_handler_block_by_data (GTK_OBJECT (private->ratio_y_adj), data);
  gtk_adjustment_set_value (GTK_ADJUSTMENT (private->ratio_y_adj), ratio_y);
  gtk_signal_handler_unblock_by_data (GTK_OBJECT (private->ratio_y_adj), data);

  if (resize->type == ResizeWidget)
    {
      gimp_size_entry_set_refval_boundaries
	(GIMP_SIZE_ENTRY (private->offset_se), 0,
	 MIN (0, resize->width - private->old_width),
	 MAX (0, resize->width - private->old_width));
      resize->offset_x = resize_bound_off_x (resize, resize->offset_x);
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->offset_se),
				  0, resize->offset_x);

      gimp_size_entry_set_refval_boundaries
	(GIMP_SIZE_ENTRY (private->offset_se), 1,
	 MIN (0, resize->height - private->old_height),
	 MAX (0, resize->height - private->old_height));
      resize->offset_y = resize_bound_off_y (resize, resize->offset_y);
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->offset_se),
				  1, resize->offset_y);
    }

  if ((resize->type == ScaleWidget) && (resize->target == ResizeImage))
    {
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->printsize_se),
				  0, width);
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->printsize_se),
				  1, height);
    }

  resize_draw (resize);
}

static void
ratio_update (GtkWidget *w,
	      gpointer   data)
{
  Resize *resize;
  ResizePrivate *private;
  double ratio_x;
  double ratio_y;
  
  resize = (Resize *) data;
  private = (ResizePrivate *) resize->private_part;

  ratio_x = GTK_ADJUSTMENT (private->ratio_x_adj)->value;
  ratio_y = GTK_ADJUSTMENT (private->ratio_y_adj)->value;

  if (gimp_chain_button_get_active (GIMP_CHAIN_BUTTON (private->constrain)))
    {
      if (ratio_x != resize->ratio_x)
	{
	  ratio_y = ratio_x;
	}
      else
	{
	  ratio_x = ratio_y;
	}
    }

  resize->width = (int) (private->old_width * ratio_x);
  if (resize->width == 0) resize->width = 1;
  gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->size_se),
			      0, resize->width);
  resize->height = (int) (private->old_height * ratio_y);
  if (resize->height == 0) resize->height = 1;
  gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->size_se),
			      1, resize->height);

  resize->ratio_x = ratio_x;
  gtk_signal_handler_block_by_data (GTK_OBJECT (private->ratio_x_adj), data);
  gtk_adjustment_set_value (GTK_ADJUSTMENT (private->ratio_x_adj), ratio_x);
  gtk_signal_handler_unblock_by_data (GTK_OBJECT (private->ratio_x_adj), data);

  resize->ratio_y = ratio_y;
  gtk_signal_handler_block_by_data (GTK_OBJECT (private->ratio_y_adj), data);
  gtk_adjustment_set_value (GTK_ADJUSTMENT (private->ratio_y_adj), ratio_y);
  gtk_signal_handler_unblock_by_data (GTK_OBJECT (private->ratio_y_adj), data);

  if (resize->type == ResizeWidget)
    {
      gimp_size_entry_set_refval_boundaries
	(GIMP_SIZE_ENTRY (private->offset_se), 0,
	 MIN (0, resize->width - private->old_width),
	 MAX (0, resize->width - private->old_width));
      resize->offset_x = resize_bound_off_x (resize, resize->offset_x);
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->offset_se),
				  0, resize->offset_x);

      gimp_size_entry_set_refval_boundaries
	(GIMP_SIZE_ENTRY (private->offset_se), 1,
	 MIN (0, resize->height - private->old_height),
	 MAX (0, resize->height - private->old_height));
      resize->offset_y = resize_bound_off_y (resize, resize->offset_y);
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->offset_se),
				  1, resize->offset_y);
    }

  if ((resize->type == ScaleWidget) && (resize->target == ResizeImage))
    {
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->printsize_se),
				  0, resize->width);
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->printsize_se),
				  1, resize->height);
    }

  resize_draw (resize);
}

static void
printsize_update (GtkWidget *w,
		  gpointer   data)
{
  Resize *resize;
  ResizePrivate *private;
  double width;
  double height;
  double print_width;
  double print_height;
  double res_x;
  double res_y;

  resize = (Resize *) data;
  private = (ResizePrivate *) resize->private_part;

  width = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (private->size_se), 0);
  height = gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (private->size_se), 1);

  print_width =
    gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (private->printsize_se), 0);
  print_height =
    gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (private->printsize_se), 1);

  /*  this is tricky: we use the sizes in pixels (which is otherwise
   *  meaningless for the "print size" widgets) to calculate the new
   *  resolution.
   */
  res_x = resize->resolution_x * width / print_width;
  res_y = resize->resolution_y * height / print_height;

  if (gimp_chain_button_get_active (GIMP_CHAIN_BUTTON (private->equal_res)))
    {
      if (res_x != resize->resolution_x)
	{
	  res_y = res_x;
	  gimp_size_entry_set_resolution
	    (GIMP_SIZE_ENTRY (private->printsize_se), 0, res_x, FALSE);
	  gimp_size_entry_set_resolution
	    (GIMP_SIZE_ENTRY (private->printsize_se), 1, res_y, TRUE);
	}
      else
	{
	  res_x = res_y;
	  gimp_size_entry_set_resolution
	    (GIMP_SIZE_ENTRY (private->printsize_se), 0, res_x, TRUE);
	  gimp_size_entry_set_resolution
	    (GIMP_SIZE_ENTRY (private->printsize_se), 1, res_y, FALSE);
	}
    }

  gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->resolution_se),
			      0, res_x);
  gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->resolution_se),
			      1, res_y);

  gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (private->size_se),
				  0, res_x, TRUE);
  gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (private->size_se),
				  1, res_y, TRUE);

  if (! gimp_chain_button_get_active (GIMP_CHAIN_BUTTON (private->equal_res)))
    {
      gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (private->printsize_se),
				      0, res_x, FALSE);
      gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (private->printsize_se),
				      1, res_y, FALSE);
    }

  resize->resolution_x = res_x;
  resize->resolution_y = res_y;
}

static void
resolution_update (GtkWidget *w,
		   gpointer   data)
{
  Resize *resize;
  ResizePrivate *private;
  double res_x;
  double res_y;
  
  resize = (Resize *) data;
  private = (ResizePrivate *) resize->private_part;

  res_x =
    gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (private->resolution_se), 0);
  res_y =
    gimp_size_entry_get_refval (GIMP_SIZE_ENTRY (private->resolution_se), 1);

  if (gimp_chain_button_get_active (GIMP_CHAIN_BUTTON (private->equal_res)))
    {
      if (res_x != resize->resolution_x)
	{
	  res_y = res_x;
	}
      else
	{
	  res_x = res_y;
	}
    }

  gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->resolution_se),
			      0, res_x);
  gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->resolution_se),
			      1, res_y);

  gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (private->size_se),
				  0, res_x, TRUE);
  gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (private->size_se),
				  1, res_y, TRUE);

  gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (private->printsize_se),
				  0, res_x, TRUE);
  gimp_size_entry_set_resolution (GIMP_SIZE_ENTRY (private->printsize_se),
				  1, res_y, TRUE);

  resize->resolution_x = res_x;
  resize->resolution_y = res_y;
}

static gint
resize_events (GtkWidget *widget,
	       GdkEvent  *event)
{
  Resize *resize;
  ResizePrivate *private;
  int dx, dy;
  int off_x, off_y;

  resize = (Resize *) gtk_object_get_user_data (GTK_OBJECT (widget));
  private = (ResizePrivate *) resize->private_part;

  switch (event->type)
    {
    case GDK_EXPOSE:
      resize_draw (resize);
      break;
    case GDK_BUTTON_PRESS:
      gdk_pointer_grab (private->drawing_area->window, FALSE,
			(GDK_BUTTON1_MOTION_MASK |
			 GDK_BUTTON_RELEASE_MASK),
			NULL, NULL, event->button.time);
      private->orig_x = resize->offset_x;
      private->orig_y = resize->offset_y;
      private->start_x = event->button.x;
      private->start_y = event->button.y;
      break;
    case GDK_MOTION_NOTIFY:
      /*  X offset  */
      dx = event->motion.x - private->start_x;
      off_x = private->orig_x + dx / private->ratio;
      off_x = resize_bound_off_x (resize, off_x);
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->offset_se),
				  0, off_x);

      /*  Y offset  */
      dy = event->motion.y - private->start_y;
      off_y = private->orig_y + dy / private->ratio;
      off_y = resize_bound_off_y (resize, off_y);
      gimp_size_entry_set_refval (GIMP_SIZE_ENTRY (private->offset_se),
				  1, off_y);

      gtk_signal_emit_by_name (GTK_OBJECT (private->offset_se), "refval_changed",
			       resize);
      break;
    case GDK_BUTTON_RELEASE:
      gdk_pointer_ungrab (event->button.time);
      break;
    default:
      break;
    }

  return FALSE;
}