mirror of https://github.com/GNOME/gimp.git
159 lines
4.3 KiB
C
159 lines
4.3 KiB
C
/* The GIMP -- an image manipulation program
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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 2 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, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include "config.h"
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#include <glib-object.h>
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#include "libgimpbase/gimpbase.h"
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#include "core-types.h"
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#include "gimp.h"
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#include "gimpimage.h"
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#include "gimpitem.h"
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#include "gimpitem-align.h"
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#include "gimp-intl.h"
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/**
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* gimp_item_align:
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* @target: The #GimpItem to move.
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* @target_alignment: The part of the target to align..
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* @reference: The #GimpItem to align the target with.
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* @reference_alignment: The part of the reference item to align the target item with..
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* @offset: How much to shift the target from perfect alignment..
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*
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* Aligns the target item with the reference item in the specified way. If
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* the reference item is #NULL, then the target item is aligned with the
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* image it belongs to.
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*/
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void
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gimp_item_align (GimpItem *target,
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GimpAlignmentType target_alignment,
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GimpItem *reference,
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GimpAlignmentType reference_alignment,
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gint offset)
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{
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gboolean do_x = FALSE;
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gboolean do_y = FALSE;
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gint xtranslate = 0;
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gint ytranslate = 0;
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gint reference_offset_x;
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gint reference_offset_y;
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gint reference_height;
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gint reference_width;
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gint x0 = 0;
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gint y0 = 0;
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gint x1 = 0;
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gint y1 = 0;
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if (!target)
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return;
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if (! (reference || target->gimage))
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return;
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if (reference)
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{
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reference_offset_x = reference->offset_x;
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reference_offset_y = reference->offset_y;
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reference_height = reference->height;
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reference_width = reference->width;
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}
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else
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{
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reference_offset_x = 0;
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reference_offset_y = 0;
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reference_height = gimp_image_get_height (target->gimage);
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reference_width = gimp_image_get_width (target->gimage);
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}
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switch (reference_alignment)
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{
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case GIMP_ALIGN_LEFT:
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do_x = TRUE;
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x0 = reference_offset_x;
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break;
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case GIMP_ALIGN_CENTER:
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do_x = TRUE;
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x0 = reference_offset_x + reference_width/2;
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break;
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case GIMP_ALIGN_RIGHT:
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do_x = TRUE;
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x0 = reference_offset_x + reference_width;
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break;
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case GIMP_ALIGN_TOP:
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do_y = TRUE;
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y0 = reference_offset_y;
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break;
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case GIMP_ALIGN_MIDDLE:
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do_y = TRUE;
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y0 = reference_offset_y + reference_height/2;
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break;
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case GIMP_ALIGN_BOTTOM:
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do_y = TRUE;
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y0 = reference_offset_y + reference_height;
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break;
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default:
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g_assert_not_reached ();
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}
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if (do_x)
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{
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switch (target_alignment)
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{
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case GIMP_ALIGN_LEFT:
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x1 = target->offset_x;
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break;
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case GIMP_ALIGN_CENTER:
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x1 = target->offset_x + target->width/2;
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break;
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case GIMP_ALIGN_RIGHT:
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x1 = target->offset_x + target->width;
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break;
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default:
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g_assert_not_reached ();
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}
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xtranslate = x0 - x1 + offset;
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}
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if (do_y)
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{
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switch (target_alignment)
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{
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case GIMP_ALIGN_TOP:
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y1 = target->offset_y;
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break;
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case GIMP_ALIGN_MIDDLE:
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y1 = target->offset_y + target->height/2;
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break;
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case GIMP_ALIGN_BOTTOM:
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y1 = target->offset_y + target->height;
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break;
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default:
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g_assert_not_reached ();
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}
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ytranslate = y0 - y1 + offset;
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}
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gimp_item_translate (target, xtranslate, ytranslate, TRUE);
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}
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