478 lines
16 KiB
C
478 lines
16 KiB
C
/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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* Copyright (C) 1995 Spencer Kimball and Peter Mattis
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include <gegl.h>
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#include "libpikamath/pikamath.h"
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#include "core-types.h"
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#include "pikaimage.h"
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#include "pikaimage-arrange.h"
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#include "pikaimage-guides.h"
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#include "pikaimage-undo.h"
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#include "pikaitem.h"
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#include "pikaguide.h"
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#include "pikapickable.h"
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#include "pikapickable-auto-shrink.h"
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#include "pika-intl.h"
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static void compute_offsets (GList *list,
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gboolean use_x_offset,
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gdouble align_x,
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gdouble align_y,
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gboolean align_contents);
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static void compute_offset (GObject *object,
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gboolean use_x_offset,
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gdouble align_x,
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gdouble align_y,
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gboolean align_contents);
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static gint offset_compare (gconstpointer a,
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gconstpointer b);
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/**
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* pika_image_arrange_objects:
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* @image: The #PikaImage to which the objects belong.
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* @list: A #GList of objects to be aligned.
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* @align_x: Relative X coordinate of point on each target object to bring into alignment.
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* @align_y: Relative Y coordinate of point on each target object to bring into alignment.
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* @reference: The #GObject to align the targets with, or %NULL.
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* @reference_alignment: The point on the reference object to align the target item with..
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* @align_contents: Take into account non-empty contents rather than item borders.
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*
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* This function shifts the positions of a set of target objects,
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* which can be "items" or guides, to bring them into a specified type
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* of alignment with a reference object, which can be an item, guide,
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* or image. If the requested alignment does not make sense (i.e.,
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* trying to align a vertical guide vertically), nothing happens and
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* no error message is generated.
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*
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* The objects in the list are sorted into increasing order before
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* being arranged, where the order is defined by the type of alignment
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* being requested. If the @reference argument is %NULL, then the
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* first object in the sorted list is used as reference.
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*/
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void
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pika_image_arrange_objects (PikaImage *image,
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GList *list,
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gdouble align_x,
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gdouble align_y,
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GObject *reference,
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PikaAlignmentType reference_alignment,
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gboolean align_contents)
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{
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gdouble reference_x = 0.0;
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gdouble reference_y = 0.0;
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gboolean use_ref_x_offset = FALSE;
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gboolean use_obj_x_offset = FALSE;
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gboolean do_x = FALSE;
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gboolean do_y = FALSE;
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gint z0 = 0;
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GList *object_list = NULL;
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g_return_if_fail (PIKA_IS_IMAGE (image));
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g_return_if_fail (G_IS_OBJECT (reference) || reference == NULL);
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/* Create the base list, removing any item which has one of its ancestor also
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* in the list (in such case, we only rearrange the ancestor item.
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*/
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for (GList *iter = list; iter; iter = iter->next)
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{
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GList *iter2 = NULL;
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if (PIKA_IS_ITEM (iter->data))
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{
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for (iter2 = list; iter2; iter2 = iter2->next)
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{
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if (PIKA_IS_ITEM (iter2->data) &&
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pika_viewable_is_ancestor (iter2->data, iter->data))
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break;
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}
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}
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if (iter2 == NULL)
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object_list = g_list_prepend (object_list, iter->data);
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}
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/* get offsets used for sorting */
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switch (reference_alignment)
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{
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/* order vertically for horizontal alignment */
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case PIKA_ALIGN_LEFT:
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case PIKA_ALIGN_HCENTER:
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case PIKA_ALIGN_RIGHT:
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if (PIKA_IS_GUIDE (reference) &&
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pika_guide_get_orientation (PIKA_GUIDE (reference)) == PIKA_ORIENTATION_HORIZONTAL)
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return;
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use_obj_x_offset = TRUE;
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use_ref_x_offset = TRUE;
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if (reference_alignment == PIKA_ALIGN_HCENTER)
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reference_x = 0.5;
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else if (reference_alignment == PIKA_ALIGN_RIGHT)
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reference_x = 1.0;
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do_x = TRUE;
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break;
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/* order horizontally for horizontal arrangement */
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case PIKA_ARRANGE_HFILL:
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if (g_list_length (object_list) <= 2)
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return;
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use_obj_x_offset = TRUE;
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use_ref_x_offset = TRUE;
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do_x = TRUE;
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break;
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/* order horizontally for vertical alignment */
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case PIKA_ALIGN_TOP:
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case PIKA_ALIGN_VCENTER:
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case PIKA_ALIGN_BOTTOM:
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if (PIKA_IS_GUIDE (reference) &&
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pika_guide_get_orientation (PIKA_GUIDE (reference)) == PIKA_ORIENTATION_VERTICAL)
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return;
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if (reference_alignment == PIKA_ALIGN_VCENTER)
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reference_y = 0.5;
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else if (reference_alignment == PIKA_ALIGN_BOTTOM)
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reference_y = 1.0;
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do_y = TRUE;
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break;
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/* order vertically for vertical arrangement */
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case PIKA_ARRANGE_VFILL:
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if (g_list_length (object_list) <= 2)
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return;
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do_y = TRUE;
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break;
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case PIKA_DISTRIBUTE_EVEN_HORIZONTAL_GAP:
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use_obj_x_offset = TRUE;
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do_x = TRUE;
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case PIKA_DISTRIBUTE_EVEN_VERTICAL_GAP:
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if (g_list_length (object_list) <= 2)
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return;
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if (! do_x)
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do_y = TRUE;
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/* Gap distribution does not use the anchor point. */
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align_x = align_y = 0.0;
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break;
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default:
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g_return_if_reached ();
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}
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/* get offsets used for sorting */
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compute_offsets (object_list, use_obj_x_offset, align_x, align_y, align_contents);
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/* Sort by offset. */
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object_list = g_list_sort (object_list, offset_compare);
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/* now get offsets used for aligning */
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compute_offsets (object_list, use_obj_x_offset, align_x, align_y, align_contents);
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if (object_list)
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{
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GList *list;
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gint n;
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gdouble fill_offset = 0;
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if (reference_alignment == PIKA_ARRANGE_HFILL ||
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reference_alignment == PIKA_ARRANGE_VFILL ||
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reference_alignment == PIKA_DISTRIBUTE_EVEN_HORIZONTAL_GAP ||
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reference_alignment == PIKA_DISTRIBUTE_EVEN_VERTICAL_GAP)
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{
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/* Distribution does not use the reference. Extreme coordinate items
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* are used instead.
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*/
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GList *last_object = g_list_last (object_list);
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gint distr_length;
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z0 = GPOINTER_TO_INT (g_object_get_data (object_list->data, "align-offset"));
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distr_length = GPOINTER_TO_INT (g_object_get_data (last_object->data, "align-offset")) - z0;
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if (reference_alignment == PIKA_DISTRIBUTE_EVEN_HORIZONTAL_GAP ||
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reference_alignment == PIKA_DISTRIBUTE_EVEN_VERTICAL_GAP)
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{
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for (list = object_list; list && list->next; list = g_list_next (list))
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{
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gint obj_len;
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if (reference_alignment == PIKA_DISTRIBUTE_EVEN_HORIZONTAL_GAP)
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obj_len = GPOINTER_TO_INT (g_object_get_data (list->data, "align-width"));
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else
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obj_len = GPOINTER_TO_INT (g_object_get_data (list->data, "align-height"));
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distr_length -= obj_len;
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/* Initial offset is at end of first object. */
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if (list == object_list)
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z0 += obj_len;
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}
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fill_offset = distr_length / (gdouble) (g_list_length (object_list) - 1);
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}
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else
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{
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fill_offset = distr_length / (gdouble) (g_list_length (object_list) - 1);
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}
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/* Removing first and last objects. These stay unmoved. */
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object_list = g_list_delete_link (object_list, last_object);
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object_list = g_list_delete_link (object_list, object_list);
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}
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else
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{
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if (reference == NULL)
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{
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reference = G_OBJECT (object_list->data);
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object_list = g_list_delete_link (object_list, object_list);
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}
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/* Compute the offset for the reference (for alignment). */
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compute_offset (reference, use_ref_x_offset, reference_x, reference_y, align_contents);
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z0 = GPOINTER_TO_INT (g_object_get_data (reference, "align-offset"));
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}
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/* FIXME: undo group type is wrong */
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pika_image_undo_group_start (image, PIKA_UNDO_GROUP_ITEM_DISPLACE,
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C_("undo-type", "Arrange Objects"));
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for (list = object_list, n = 1;
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list;
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list = g_list_next (list), n++)
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{
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GObject *target = list->data;
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gint xtranslate = 0;
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gint ytranslate = 0;
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gint z1;
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z1 = GPOINTER_TO_INT (g_object_get_data (target, "align-offset"));
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if (reference_alignment == PIKA_ARRANGE_HFILL)
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{
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xtranslate = ROUND (z0 - z1 + n * fill_offset);
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}
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else if (reference_alignment == PIKA_ARRANGE_VFILL)
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{
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ytranslate = ROUND (z0 - z1 + n * fill_offset);
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}
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else if (reference_alignment == PIKA_DISTRIBUTE_EVEN_HORIZONTAL_GAP)
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{
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gint obj_len;
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xtranslate = ROUND (z0 + fill_offset - z1);
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obj_len = GPOINTER_TO_INT (g_object_get_data (target, "align-width"));
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z0 = z0 + fill_offset + obj_len;
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}
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else if (reference_alignment == PIKA_DISTRIBUTE_EVEN_VERTICAL_GAP)
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{
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gint obj_len;
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ytranslate = ROUND (z0 + fill_offset - z1);
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obj_len = GPOINTER_TO_INT (g_object_get_data (target, "align-height"));
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z0 = z0 + fill_offset + obj_len;
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}
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else /* the normal computing, when we don't depend on the
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* width or height of the reference object
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*/
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{
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if (do_x)
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xtranslate = z0 - z1;
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if (do_y)
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ytranslate = z0 - z1;
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}
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/* now actually align the target object */
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if (PIKA_IS_ITEM (target))
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{
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pika_item_translate (PIKA_ITEM (target),
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xtranslate, ytranslate, TRUE);
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}
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else if (PIKA_IS_GUIDE (target))
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{
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PikaGuide *guide = PIKA_GUIDE (target);
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switch (pika_guide_get_orientation (guide))
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{
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case PIKA_ORIENTATION_VERTICAL:
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pika_image_move_guide (image, guide, z1 + xtranslate, TRUE);
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break;
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case PIKA_ORIENTATION_HORIZONTAL:
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pika_image_move_guide (image, guide, z1 + ytranslate, TRUE);
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break;
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default:
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break;
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}
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}
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}
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pika_image_undo_group_end (image);
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}
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g_list_free (object_list);
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}
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static gint
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offset_compare (gconstpointer a,
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gconstpointer b)
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{
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gint offset1 = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (a),
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"align-offset"));
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gint offset2 = GPOINTER_TO_INT (g_object_get_data (G_OBJECT (b),
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"align-offset"));
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return offset1 - offset2;
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}
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/* this function computes the position of the alignment point
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* for each object in the list, and attaches it to the
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* object as object data.
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*/
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static void
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compute_offsets (GList *list,
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gboolean use_x_offset,
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gdouble align_x,
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gdouble align_y,
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gboolean align_contents)
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{
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GList *l;
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for (l = list; l; l = g_list_next (l))
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compute_offset (l->data, use_x_offset, align_x, align_y, align_contents);
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}
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static void
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compute_offset (GObject *object,
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gboolean use_x_offset,
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gdouble align_x,
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gdouble align_y,
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gboolean align_contents)
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{
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gint object_offset_x = 0;
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gint object_offset_y = 0;
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gint object_height = 0;
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gint object_width = 0;
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gint offset = 0;
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if (PIKA_IS_IMAGE (object))
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{
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PikaImage *image = PIKA_IMAGE (object);
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object_offset_x = 0;
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object_offset_y = 0;
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object_height = pika_image_get_height (image);
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object_width = pika_image_get_width (image);
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}
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else if (PIKA_IS_ITEM (object))
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{
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PikaItem *item = PIKA_ITEM (object);
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gint off_x, off_y;
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pika_item_bounds (item,
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&object_offset_x,
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&object_offset_y,
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&object_width,
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&object_height);
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if (align_contents && PIKA_IS_PICKABLE (object))
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{
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gint x;
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gint y;
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gint width;
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gint height;
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if (pika_pickable_auto_shrink (PIKA_PICKABLE (object),
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0, 0,
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pika_item_get_width (PIKA_ITEM (object)),
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pika_item_get_height (PIKA_ITEM (object)),
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&x, &y, &width, &height) == PIKA_AUTO_SHRINK_SHRINK)
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{
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object_offset_x += x;
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object_offset_y += y;
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object_width = width;
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object_height = height;
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}
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}
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pika_item_get_offset (item, &off_x, &off_y);
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object_offset_x += off_x;
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object_offset_y += off_y;
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}
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else if (PIKA_IS_GUIDE (object))
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{
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PikaGuide *guide = PIKA_GUIDE (object);
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switch (pika_guide_get_orientation (guide))
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{
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case PIKA_ORIENTATION_VERTICAL:
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object_offset_x = pika_guide_get_position (guide);
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object_width = 0;
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break;
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case PIKA_ORIENTATION_HORIZONTAL:
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object_offset_y = pika_guide_get_position (guide);
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object_height = 0;
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break;
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default:
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break;
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}
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}
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else
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{
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g_printerr ("Alignment object is not an image, item or guide.\n");
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}
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if (use_x_offset)
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offset = object_offset_x + object_width * align_x;
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else
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offset = object_offset_y + object_height * align_y;
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g_object_set_data (object, "align-offset",
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GINT_TO_POINTER (offset));
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/* These are only used for HFILL and VFILL, but since the call to
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* pika_image_arrange_objects allows for two different alignments
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* (object and reference_alignment) we better be on the safe side in
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* case they differ. (the current implementation of the align tool
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* always pass the same value to both parameters)
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*/
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g_object_set_data (object, "align-width",
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GINT_TO_POINTER (object_width));
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g_object_set_data (object, "align-height",
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GINT_TO_POINTER (object_height));
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}
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