mirror of https://github.com/GNOME/gimp.git
385 lines
9.3 KiB
C
385 lines
9.3 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 "core-types.h"
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#include "gimp.h"
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#include "gimpimage.h"
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#include "gimpimage-grid.h"
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#include "gimpimage-snap.h"
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#include "gimp-intl.h"
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#define EPSILON 5
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/* public functions */
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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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gboolean snap_to_guides,
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gboolean snap_to_grid)
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{
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GList *list;
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GimpGuide *guide;
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GimpGrid *grid;
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gdouble xspacing;
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gdouble xoffset;
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gint mindist = G_MAXINT;
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gint dist;
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gint i;
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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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if (! snap_to_guides && ! snap_to_grid)
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return 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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if (snap_to_guides && gimage->guides != 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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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 (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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}
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if (snap_to_grid && gimage->grid != NULL)
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{
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grid = gimp_image_get_grid (gimage);
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g_object_get (grid,
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"xspacing", &xspacing,
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"xoffset", &xoffset,
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NULL);
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for (i = xoffset; i <= gimage->width; i += xspacing)
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{
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if (i < 0)
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continue;
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dist = ABS (i - x);
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if (dist < MIN (EPSILON, mindist))
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{
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mindist = dist;
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*tx = i;
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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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gboolean snap_to_guides,
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gboolean snap_to_grid)
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{
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GList *list;
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GimpGuide *guide;
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GimpGrid *grid;
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gdouble yspacing;
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gdouble yoffset;
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gint mindist = G_MAXINT;
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gint dist;
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gint i;
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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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if (! snap_to_guides && ! snap_to_grid)
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return 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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if (snap_to_guides && gimage->guides != 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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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 (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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}
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if (snap_to_grid && gimage->grid != NULL)
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{
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grid = gimp_image_get_grid (gimage);
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g_object_get (grid,
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"yspacing", &yspacing,
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"yoffset", &yoffset,
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NULL);
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for (i = yoffset; i <= gimage->height; i += yspacing)
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{
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if (i < 0)
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continue;
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dist = ABS (i - y);
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if (dist < MIN (EPSILON, mindist))
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{
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mindist = dist;
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*ty = i;
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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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gboolean snap_to_guides,
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gboolean snap_to_grid)
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{
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GList *list;
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GimpGuide *guide;
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GimpGrid *grid;
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gdouble xspacing, yspacing;
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gdouble xoffset, yoffset;
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gint minxdist, minydist;
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gint dist;
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gint i;
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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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if (! snap_to_guides && ! snap_to_grid)
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return 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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if (snap_to_guides && gimage->guides != 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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dist = ABS (guide->position - y);
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if (dist < MIN (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 (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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}
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if (snap_to_grid && gimage->grid != NULL)
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{
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grid = gimp_image_get_grid (gimage);
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g_object_get (grid,
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"xspacing", &xspacing,
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"yspacing", &yspacing,
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"xoffset", &xoffset,
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"yoffset", &yoffset,
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NULL);
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for (i = xoffset; i <= gimage->width; i += xspacing)
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{
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if (i < 0)
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continue;
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dist = ABS (i - x);
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if (dist < MIN (EPSILON, minxdist))
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{
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minxdist = dist;
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*tx = i;
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snapped = TRUE;
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}
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}
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for (i = yoffset; i <= gimage->height; i += yspacing)
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{
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if (i < 0)
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continue;
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dist = ABS (i - y);
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if (dist < MIN (EPSILON, minydist))
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{
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minydist = dist;
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*ty = i;
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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_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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gboolean snap_to_guides,
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gboolean snap_to_grid)
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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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if (! snap_to_guides && ! snap_to_grid)
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return 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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snap_to_guides,
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snap_to_grid);
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snap2 = gimp_image_snap_x (gimage, x2, &nx2,
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snap_to_guides,
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snap_to_grid);
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snap3 = gimp_image_snap_y (gimage, y1, &ny1,
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snap_to_guides,
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snap_to_grid);
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snap4 = gimp_image_snap_y (gimage, y2, &ny2,
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snap_to_guides,
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snap_to_grid);
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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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