272ee133ed
2003-05-18 Michael Natterer <mitch@gimp.org> * app/core/gimpimage-guides.c (gimp_image_snap_rectangle): snap correctly to the bottom and right sides of the rectangle. Also snap to the closer guide if we snap twice on one axis. Fixes bug #113233. All snapping functions: use ROUND() instead of truncating the double coords.
425 lines
9.8 KiB
C
425 lines
9.8 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 "core-types.h"
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#include "gimp.h"
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#include "gimpimage.h"
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#include "gimpimage-guides.h"
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#include "gimpimage-undo-push.h"
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#include "gimp-intl.h"
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#define GUIDE_EPSILON 5
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/* public functions */
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GimpGuide *
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gimp_image_add_hguide (GimpImage *gimage,
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gint position,
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gboolean push_undo)
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{
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GimpGuide *guide;
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g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
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g_return_val_if_fail (position >= 0 && position <= gimage->height, NULL);
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guide = g_new0 (GimpGuide, 1);
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guide->ref_count = 1;
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guide->position = -1;
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guide->orientation = GIMP_ORIENTATION_HORIZONTAL;
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guide->guide_ID = gimage->gimp->next_guide_ID++;
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if (push_undo)
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gimp_image_undo_push_image_guide (gimage, _("Add Horizontal Guide"),
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guide);
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gimp_image_add_guide (gimage, guide, position);
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gimp_image_guide_unref (guide);
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return guide;
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}
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GimpGuide *
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gimp_image_add_vguide (GimpImage *gimage,
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gint position,
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gboolean push_undo)
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{
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GimpGuide *guide;
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g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
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g_return_val_if_fail (position >= 0 && position <= gimage->width, NULL);
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guide = g_new0 (GimpGuide, 1);
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guide->ref_count = 1;
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guide->position = -1;
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guide->orientation = GIMP_ORIENTATION_VERTICAL;
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guide->guide_ID = gimage->gimp->next_guide_ID++;
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if (push_undo)
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gimp_image_undo_push_image_guide (gimage, _("Add Vertical Guide"),
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guide);
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gimp_image_add_guide (gimage, guide, position);
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gimp_image_guide_unref (guide);
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return guide;
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}
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GimpGuide *
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gimp_image_guide_ref (GimpGuide *guide)
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{
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g_return_val_if_fail (guide != NULL, NULL);
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guide->ref_count++;
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return guide;
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}
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void
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gimp_image_guide_unref (GimpGuide *guide)
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{
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g_return_if_fail (guide != NULL);
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guide->ref_count--;
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if (guide->ref_count < 1)
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g_free (guide);
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}
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void
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gimp_image_add_guide (GimpImage *gimage,
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GimpGuide *guide,
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gint position)
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{
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g_return_if_fail (GIMP_IS_IMAGE (gimage));
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g_return_if_fail (guide != NULL);
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g_return_if_fail (position >= 0);
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if (guide->orientation == GIMP_ORIENTATION_HORIZONTAL)
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g_return_if_fail (position <= gimage->height);
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else
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g_return_if_fail (position <= gimage->width);
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gimage->guides = g_list_prepend (gimage->guides, guide);
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guide->position = position;
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gimp_image_guide_ref (guide);
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gimp_image_update_guide (gimage, guide);
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}
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void
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gimp_image_remove_guide (GimpImage *gimage,
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GimpGuide *guide,
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gboolean push_undo)
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{
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g_return_if_fail (GIMP_IS_IMAGE (gimage));
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g_return_if_fail (guide != NULL);
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gimp_image_update_guide (gimage, guide);
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if (push_undo)
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gimp_image_undo_push_image_guide (gimage, _("Remove Guide"), guide);
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gimage->guides = g_list_remove (gimage->guides, guide);
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guide->position = -1;
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gimp_image_guide_unref (guide);
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}
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void
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gimp_image_move_guide (GimpImage *gimage,
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GimpGuide *guide,
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gint position,
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gboolean push_undo)
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{
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g_return_if_fail (GIMP_IS_IMAGE (gimage));
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g_return_if_fail (guide != NULL);
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g_return_if_fail (position >= 0);
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if (guide->orientation == GIMP_ORIENTATION_HORIZONTAL)
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g_return_if_fail (position <= gimage->height);
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else
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g_return_if_fail (position <= gimage->width);
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if (push_undo)
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gimp_image_undo_push_image_guide (gimage, _("Move Guide"), guide);
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gimp_image_update_guide (gimage, guide);
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guide->position = position;
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gimp_image_update_guide (gimage, guide);
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}
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GimpGuide *
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gimp_image_find_guide (GimpImage *gimage,
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gdouble x,
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gdouble y)
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{
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GList *list;
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GimpGuide *guide;
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g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
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if (x < 0 || x >= gimage->width ||
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y < 0 || y >= gimage->height)
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{
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return NULL;
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}
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for (list = gimage->guides; list; list = g_list_next (list))
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{
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guide = (GimpGuide *) list->data;
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if (guide->position < 0)
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continue;
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switch (guide->orientation)
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{
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case GIMP_ORIENTATION_HORIZONTAL:
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if (ABS (guide->position - y) < GUIDE_EPSILON)
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return guide;
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break;
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case GIMP_ORIENTATION_VERTICAL:
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if (ABS (guide->position - x) < GUIDE_EPSILON)
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return guide;
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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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return NULL;
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}
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gboolean
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gimp_image_snap_x (GimpImage *gimage,
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gdouble x,
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gint *tx)
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{
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GList *list;
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GimpGuide *guide;
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gint mindist = G_MAXINT;
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gint dist;
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gboolean snapped = FALSE;
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g_return_val_if_fail (GIMP_IS_IMAGE (gimage), FALSE);
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g_return_val_if_fail (tx != NULL, FALSE);
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*tx = ROUND (x);
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if (x < 0 || x >= gimage->width)
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return FALSE;
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for (list = gimage->guides; list; list = g_list_next (list))
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{
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guide = (GimpGuide *) list->data;
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if (guide->position < 0)
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continue;
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if (guide->orientation == GIMP_ORIENTATION_VERTICAL)
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{
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dist = ABS (guide->position - x);
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if (dist < MIN (GUIDE_EPSILON, mindist))
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{
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mindist = dist;
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*tx = guide->position;
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snapped = TRUE;
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}
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}
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}
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return snapped;
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}
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gboolean
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gimp_image_snap_y (GimpImage *gimage,
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gdouble y,
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gint *ty)
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{
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GList *list;
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GimpGuide *guide;
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gint mindist = G_MAXINT;
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gint dist;
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gboolean snapped = FALSE;
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g_return_val_if_fail (GIMP_IS_IMAGE (gimage), FALSE);
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g_return_val_if_fail (ty != NULL, FALSE);
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*ty = ROUND (y);
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if (y < 0 || y >= gimage->height)
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return FALSE;
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for (list = gimage->guides; list; list = g_list_next (list))
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{
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guide = (GimpGuide *) list->data;
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if (guide->position < 0)
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continue;
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if (guide->orientation == GIMP_ORIENTATION_HORIZONTAL)
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{
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dist = ABS (guide->position - y);
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if (dist < MIN (GUIDE_EPSILON, mindist))
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{
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mindist = dist;
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*ty = guide->position;
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snapped = TRUE;
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}
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}
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}
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return snapped;
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}
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gboolean
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gimp_image_snap_point (GimpImage *gimage,
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gdouble x,
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gdouble y,
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gint *tx,
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gint *ty)
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{
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GList *list;
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GimpGuide *guide;
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gint minxdist, minydist;
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gint dist;
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gboolean snapped = FALSE;
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g_return_val_if_fail (GIMP_IS_IMAGE (gimage), FALSE);
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g_return_val_if_fail (tx != NULL, FALSE);
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g_return_val_if_fail (ty != NULL, FALSE);
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*tx = ROUND (x);
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*ty = ROUND (y);
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if (x < 0 || x >= gimage->width ||
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y < 0 || y >= gimage->height)
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{
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return FALSE;
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}
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minxdist = G_MAXINT;
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minydist = G_MAXINT;
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for (list = gimage->guides; list; list = g_list_next (list))
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{
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guide = (GimpGuide *) list->data;
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if (guide->position < 0)
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continue;
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switch (guide->orientation)
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{
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case GIMP_ORIENTATION_HORIZONTAL:
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dist = ABS (guide->position - y);
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if (dist < MIN (GUIDE_EPSILON, minydist))
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{
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minydist = dist;
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*ty = guide->position;
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snapped = TRUE;
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}
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break;
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case GIMP_ORIENTATION_VERTICAL:
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dist = ABS (guide->position - x);
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if (dist < MIN (GUIDE_EPSILON, minxdist))
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{
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minxdist = dist;
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*tx = guide->position;
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snapped = TRUE;
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}
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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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return snapped;
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}
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gboolean
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gimp_image_snap_rectangle (GimpImage *gimage,
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gdouble x1,
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gdouble y1,
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gdouble x2,
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gdouble y2,
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gint *tx1,
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gint *ty1)
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{
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gint nx1, ny1;
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gint nx2, ny2;
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gboolean snap1, snap2, snap3, snap4;
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g_return_val_if_fail (GIMP_IS_IMAGE (gimage), FALSE);
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g_return_val_if_fail (tx1 != NULL, FALSE);
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g_return_val_if_fail (ty1 != NULL, FALSE);
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*tx1 = ROUND (x1);
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*ty1 = ROUND (y1);
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snap1 = gimp_image_snap_x (gimage, x1, &nx1);
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snap2 = gimp_image_snap_x (gimage, x2, &nx2);
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snap3 = gimp_image_snap_y (gimage, y1, &ny1);
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snap4 = gimp_image_snap_y (gimage, y2, &ny2);
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if (snap1 && snap2)
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{
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if (ABS (x1 - nx1) > ABS (x2 - nx2))
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snap1 = FALSE;
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else
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snap2 = FALSE;
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}
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if (snap1)
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*tx1 = nx1;
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else if (snap2)
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*tx1 = ROUND (x1 + (nx2 - x2));
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if (snap3 && snap4)
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{
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if (ABS (y1 - ny1) > ABS (y2 - ny2))
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snap3 = FALSE;
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else
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snap4 = FALSE;
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}
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if (snap3)
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*ty1 = ny1;
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else if (snap4)
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*ty1 = ROUND (y1 + (ny2 - y2));
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return (snap1 || snap2 || snap3 || snap4);
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}
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