mirror of https://github.com/GNOME/gimp.git
704 lines
22 KiB
C
704 lines
22 KiB
C
/* GIMP - The GNU 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 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 <http://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gegl.h>
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#include "libgimpmath/gimpmath.h"
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#include "core-types.h"
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#include "gimp.h"
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#include "gimpguide.h"
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#include "gimpimage.h"
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#include "gimpimage-grid.h"
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#include "gimpimage-guides.h"
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#include "gimpimage-snap.h"
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#include "vectors/gimpstroke.h"
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#include "vectors/gimpvectors.h"
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#include "gimp-intl.h"
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static gboolean gimp_image_snap_distance (const gdouble unsnapped,
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const gdouble nearest,
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const gdouble epsilon,
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gdouble *mindist,
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gdouble *target);
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/* public functions */
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gboolean
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gimp_image_snap_x (GimpImage *image,
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gdouble x,
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gdouble *tx,
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gdouble epsilon_x,
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gboolean snap_to_guides,
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gboolean snap_to_grid,
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gboolean snap_to_canvas)
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{
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gdouble mindist = G_MAXDOUBLE;
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gboolean snapped = FALSE;
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g_return_val_if_fail (GIMP_IS_IMAGE (image), FALSE);
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g_return_val_if_fail (tx != NULL, FALSE);
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*tx = x;
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if (! gimp_image_get_guides (image)) snap_to_guides = FALSE;
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if (! gimp_image_get_grid (image)) snap_to_grid = FALSE;
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if (! (snap_to_guides || snap_to_grid || snap_to_canvas))
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return FALSE;
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if (x < -epsilon_x || x >= (gimp_image_get_width (image) + epsilon_x))
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return FALSE;
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if (snap_to_guides)
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{
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GList *list;
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for (list = gimp_image_get_guides (image); list; list = g_list_next (list))
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{
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GimpGuide *guide = list->data;
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gint position = gimp_guide_get_position (guide);
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if (position < 0)
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continue;
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if (gimp_guide_get_orientation (guide) == GIMP_ORIENTATION_VERTICAL)
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{
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snapped |= gimp_image_snap_distance (x, position,
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epsilon_x,
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&mindist, tx);
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}
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}
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}
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if (snap_to_grid)
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{
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GimpGrid *grid = gimp_image_get_grid (image);
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gdouble xspacing;
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gdouble xoffset;
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gdouble i;
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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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/* the snap-to-grid part could probably be rewritten */
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while (xoffset > xspacing)
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xoffset -= xspacing;
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for (i = xoffset; i <= gimp_image_get_width (image); i += xspacing)
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{
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if (i < 0)
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continue;
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snapped |= gimp_image_snap_distance (x, i,
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epsilon_x,
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&mindist, tx);
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}
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}
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if (snap_to_canvas)
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{
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snapped |= gimp_image_snap_distance (x, 0,
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epsilon_x,
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&mindist, tx);
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snapped |= gimp_image_snap_distance (x, gimp_image_get_width (image),
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epsilon_x,
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&mindist, tx);
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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 *image,
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gdouble y,
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gdouble *ty,
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gdouble epsilon_y,
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gboolean snap_to_guides,
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gboolean snap_to_grid,
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gboolean snap_to_canvas)
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{
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gdouble mindist = G_MAXDOUBLE;
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gboolean snapped = FALSE;
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g_return_val_if_fail (GIMP_IS_IMAGE (image), FALSE);
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g_return_val_if_fail (ty != NULL, FALSE);
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*ty = y;
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if (! gimp_image_get_guides (image)) snap_to_guides = FALSE;
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if (! gimp_image_get_grid (image)) snap_to_grid = FALSE;
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if (! (snap_to_guides || snap_to_grid || snap_to_canvas))
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return FALSE;
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if (y < -epsilon_y || y >= (gimp_image_get_height (image) + epsilon_y))
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return FALSE;
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if (snap_to_guides)
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{
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GList *list;
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for (list = gimp_image_get_guides (image); list; list = g_list_next (list))
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{
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GimpGuide *guide = list->data;
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gint position = gimp_guide_get_position (guide);
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if (position < 0)
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continue;
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if (gimp_guide_get_orientation (guide) == GIMP_ORIENTATION_HORIZONTAL)
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{
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snapped |= gimp_image_snap_distance (y, position,
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epsilon_y,
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&mindist, ty);
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}
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}
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}
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if (snap_to_grid)
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{
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GimpGrid *grid = gimp_image_get_grid (image);
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gdouble yspacing;
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gdouble yoffset;
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gdouble i;
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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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while (yoffset > yspacing)
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yoffset -= yspacing;
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for (i = yoffset; i <= gimp_image_get_height (image); i += yspacing)
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{
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if (i < 0)
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continue;
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snapped |= gimp_image_snap_distance (y, i,
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epsilon_y,
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&mindist, ty);
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}
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}
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if (snap_to_canvas)
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{
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snapped |= gimp_image_snap_distance (y, 0,
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epsilon_y,
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&mindist, ty);
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snapped |= gimp_image_snap_distance (y, gimp_image_get_height (image),
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epsilon_y,
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&mindist, ty);
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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 *image,
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gdouble x,
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gdouble y,
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gdouble *tx,
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gdouble *ty,
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gdouble epsilon_x,
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gdouble epsilon_y,
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gboolean snap_to_guides,
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gboolean snap_to_grid,
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gboolean snap_to_canvas,
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gboolean snap_to_vectors)
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{
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gdouble mindist_x = G_MAXDOUBLE;
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gdouble mindist_y = G_MAXDOUBLE;
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gboolean snapped = FALSE;
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g_return_val_if_fail (GIMP_IS_IMAGE (image), 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 = x;
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*ty = y;
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if (! gimp_image_get_guides (image)) snap_to_guides = FALSE;
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if (! gimp_image_get_grid (image)) snap_to_grid = FALSE;
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if (! gimp_image_get_active_vectors (image)) snap_to_vectors = FALSE;
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if (! (snap_to_guides || snap_to_grid || snap_to_canvas || snap_to_vectors))
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return FALSE;
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if (x < -epsilon_x || x >= (gimp_image_get_width (image) + epsilon_x) ||
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y < -epsilon_y || y >= (gimp_image_get_height (image) + epsilon_y))
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{
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return FALSE;
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}
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if (snap_to_guides)
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{
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GList *list;
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for (list = gimp_image_get_guides (image); list; list = g_list_next (list))
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{
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GimpGuide *guide = list->data;
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gint position = gimp_guide_get_position (guide);
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if (position < 0)
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continue;
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switch (gimp_guide_get_orientation (guide))
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{
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case GIMP_ORIENTATION_HORIZONTAL:
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snapped |= gimp_image_snap_distance (y, position,
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epsilon_y,
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&mindist_y, ty);
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break;
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case GIMP_ORIENTATION_VERTICAL:
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snapped |= gimp_image_snap_distance (x, position,
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epsilon_x,
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&mindist_x, tx);
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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)
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{
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GimpGrid *grid = gimp_image_get_grid (image);
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gdouble xspacing, yspacing;
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gdouble xoffset, yoffset;
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gdouble i;
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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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while (xoffset > xspacing)
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xoffset -= xspacing;
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while (yoffset > yspacing)
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yoffset -= yspacing;
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for (i = xoffset; i <= gimp_image_get_width (image); i += xspacing)
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{
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if (i < 0)
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continue;
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snapped |= gimp_image_snap_distance (x, i,
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epsilon_x,
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&mindist_x, tx);
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}
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for (i = yoffset; i <= gimp_image_get_height (image); i += yspacing)
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{
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if (i < 0)
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continue;
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snapped |= gimp_image_snap_distance (y, i,
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epsilon_y,
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&mindist_y, ty);
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}
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}
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if (snap_to_canvas)
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{
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snapped |= gimp_image_snap_distance (x, 0,
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epsilon_x,
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&mindist_x, tx);
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snapped |= gimp_image_snap_distance (x, gimp_image_get_width (image),
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epsilon_x,
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&mindist_x, tx);
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snapped |= gimp_image_snap_distance (y, 0,
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epsilon_y,
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&mindist_y, ty);
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snapped |= gimp_image_snap_distance (y, gimp_image_get_height (image),
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epsilon_y,
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&mindist_y, ty);
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}
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if (snap_to_vectors)
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{
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GimpVectors *vectors = gimp_image_get_active_vectors (image);
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GimpStroke *stroke = NULL;
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GimpCoords coords = { 0, 0, 0, 0, 0 };
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coords.x = x;
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coords.y = y;
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while ((stroke = gimp_vectors_stroke_get_next (vectors, stroke)))
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{
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GimpCoords nearest;
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if (gimp_stroke_nearest_point_get (stroke, &coords, 1.0,
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&nearest,
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NULL, NULL, NULL) >= 0)
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{
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snapped |= gimp_image_snap_distance (x, nearest.x,
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epsilon_x,
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&mindist_x, tx);
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snapped |= gimp_image_snap_distance (y, nearest.y,
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epsilon_y,
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&mindist_y, ty);
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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 *image,
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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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gdouble *tx1,
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gdouble *ty1,
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gdouble epsilon_x,
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gdouble epsilon_y,
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gboolean snap_to_guides,
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gboolean snap_to_grid,
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gboolean snap_to_canvas,
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gboolean snap_to_vectors)
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{
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gdouble nx, ny;
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gdouble mindist_x = G_MAXDOUBLE;
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gdouble mindist_y = G_MAXDOUBLE;
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gdouble x_center = (x1 + x2) / 2.0;
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gdouble y_center = (y1 + y2) / 2.0;
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gboolean snapped = FALSE;
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g_return_val_if_fail (GIMP_IS_IMAGE (image), 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 = x1;
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*ty1 = y1;
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if (! gimp_image_get_guides (image)) snap_to_guides = FALSE;
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if (! gimp_image_get_grid (image)) snap_to_grid = FALSE;
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if (! gimp_image_get_active_vectors (image)) snap_to_vectors = FALSE;
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if (! (snap_to_guides || snap_to_grid || snap_to_canvas || snap_to_vectors))
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return FALSE;
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/* left edge */
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if (gimp_image_snap_x (image, x1, &nx,
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MIN (epsilon_x, mindist_x),
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snap_to_guides,
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snap_to_grid,
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snap_to_canvas))
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{
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mindist_x = ABS (nx - x1);
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*tx1 = nx;
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snapped = TRUE;
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}
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/* right edge */
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if (gimp_image_snap_x (image, x2, &nx,
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MIN (epsilon_x, mindist_x),
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snap_to_guides,
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snap_to_grid,
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snap_to_canvas))
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{
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mindist_x = ABS (nx - x2);
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*tx1 = RINT (x1 + (nx - x2));
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snapped = TRUE;
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}
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/* center, vertical */
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if (gimp_image_snap_x (image, x_center, &nx,
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MIN (epsilon_x, mindist_x),
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snap_to_guides,
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snap_to_grid,
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snap_to_canvas))
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{
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mindist_x = ABS (nx - x_center);
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*tx1 = RINT (x1 + (nx - x_center));
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snapped = TRUE;
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}
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/* top edge */
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if (gimp_image_snap_y (image, y1, &ny,
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MIN (epsilon_y, mindist_y),
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snap_to_guides,
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snap_to_grid,
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snap_to_canvas))
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{
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mindist_y = ABS (ny - y1);
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*ty1 = ny;
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snapped = TRUE;
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}
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/* bottom edge */
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if (gimp_image_snap_y (image, y2, &ny,
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MIN (epsilon_y, mindist_y),
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snap_to_guides,
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snap_to_grid,
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snap_to_canvas))
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{
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mindist_y = ABS (ny - y2);
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*ty1 = RINT (y1 + (ny - y2));
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snapped = TRUE;
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}
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/* center, horizontal */
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if (gimp_image_snap_y (image, y_center, &ny,
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MIN (epsilon_y, mindist_y),
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snap_to_guides,
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snap_to_grid,
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snap_to_canvas))
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{
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mindist_y = ABS (ny - y_center);
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*ty1 = RINT (y1 + (ny - y_center));
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snapped = TRUE;
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}
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if (snap_to_vectors)
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{
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GimpVectors *vectors = gimp_image_get_active_vectors (image);
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GimpStroke *stroke = NULL;
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GimpCoords coords1 = GIMP_COORDS_DEFAULT_VALUES;
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GimpCoords coords2 = GIMP_COORDS_DEFAULT_VALUES;
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while ((stroke = gimp_vectors_stroke_get_next (vectors, stroke)))
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{
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GimpCoords nearest;
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gdouble dist;
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/* top edge */
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coords1.x = x1;
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coords1.y = y1;
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coords2.x = x2;
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coords2.y = y1;
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if (gimp_stroke_nearest_tangent_get (stroke, &coords1, &coords2,
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1.0, &nearest,
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NULL, NULL, NULL) >= 0)
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{
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snapped |= gimp_image_snap_distance (y1, nearest.y,
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epsilon_y,
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&mindist_y, ty1);
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}
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if (gimp_stroke_nearest_intersection_get (stroke, &coords1, &coords2,
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1.0, &nearest,
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NULL, NULL, NULL) >= 0)
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{
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snapped |= gimp_image_snap_distance (x1, nearest.x,
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epsilon_x,
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&mindist_x, tx1);
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}
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if (gimp_stroke_nearest_intersection_get (stroke, &coords2, &coords1,
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1.0, &nearest,
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NULL, NULL, NULL) >= 0)
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{
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dist = ABS (nearest.x - x2);
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if (dist < MIN (epsilon_x, mindist_x))
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{
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mindist_x = dist;
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*tx1 = RINT (x1 + (nearest.x - x2));
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snapped = TRUE;
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}
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}
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/* bottom edge */
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coords1.x = x1;
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coords1.y = y2;
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coords2.x = x2;
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coords2.y = y2;
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if (gimp_stroke_nearest_tangent_get (stroke, &coords1, &coords2,
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1.0, &nearest,
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NULL, NULL, NULL) >= 0)
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{
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dist = ABS (nearest.y - y2);
|
|
|
|
if (dist < MIN (epsilon_y, mindist_y))
|
|
{
|
|
mindist_y = dist;
|
|
*ty1 = RINT (y1 + (nearest.y - y2));
|
|
snapped = TRUE;
|
|
}
|
|
}
|
|
|
|
if (gimp_stroke_nearest_intersection_get (stroke, &coords1, &coords2,
|
|
1.0, &nearest,
|
|
NULL, NULL, NULL) >= 0)
|
|
{
|
|
snapped |= gimp_image_snap_distance (x1, nearest.x,
|
|
epsilon_x,
|
|
&mindist_x, tx1);
|
|
}
|
|
|
|
if (gimp_stroke_nearest_intersection_get (stroke, &coords2, &coords1,
|
|
1.0, &nearest,
|
|
NULL, NULL, NULL) >= 0)
|
|
{
|
|
dist = ABS (nearest.x - x2);
|
|
|
|
if (dist < MIN (epsilon_x, mindist_x))
|
|
{
|
|
mindist_x = dist;
|
|
*tx1 = RINT (x1 + (nearest.x - x2));
|
|
snapped = TRUE;
|
|
}
|
|
}
|
|
|
|
/* left edge */
|
|
|
|
coords1.x = x1;
|
|
coords1.y = y1;
|
|
coords2.x = x1;
|
|
coords2.y = y2;
|
|
|
|
if (gimp_stroke_nearest_tangent_get (stroke, &coords1, &coords2,
|
|
1.0, &nearest,
|
|
NULL, NULL, NULL) >= 0)
|
|
{
|
|
snapped |= gimp_image_snap_distance (x1, nearest.x,
|
|
epsilon_x,
|
|
&mindist_x, tx1);
|
|
}
|
|
|
|
if (gimp_stroke_nearest_intersection_get (stroke, &coords1, &coords2,
|
|
1.0, &nearest,
|
|
NULL, NULL, NULL) >= 0)
|
|
{
|
|
snapped |= gimp_image_snap_distance (y1, nearest.y,
|
|
epsilon_y,
|
|
&mindist_y, ty1);
|
|
}
|
|
|
|
if (gimp_stroke_nearest_intersection_get (stroke, &coords2, &coords1,
|
|
1.0, &nearest,
|
|
NULL, NULL, NULL) >= 0)
|
|
{
|
|
dist = ABS (nearest.y - y2);
|
|
|
|
if (dist < MIN (epsilon_y, mindist_y))
|
|
{
|
|
mindist_y = dist;
|
|
*ty1 = RINT (y1 + (nearest.y - y2));
|
|
snapped = TRUE;
|
|
}
|
|
}
|
|
|
|
/* right edge */
|
|
|
|
coords1.x = x2;
|
|
coords1.y = y1;
|
|
coords2.x = x2;
|
|
coords2.y = y2;
|
|
|
|
if (gimp_stroke_nearest_tangent_get (stroke, &coords1, &coords2,
|
|
1.0, &nearest,
|
|
NULL, NULL, NULL) >= 0)
|
|
{
|
|
dist = ABS (nearest.x - x2);
|
|
|
|
if (dist < MIN (epsilon_x, mindist_x))
|
|
{
|
|
mindist_x = dist;
|
|
*tx1 = RINT (x1 + (nearest.x - x2));
|
|
snapped = TRUE;
|
|
}
|
|
}
|
|
|
|
if (gimp_stroke_nearest_intersection_get (stroke, &coords1, &coords2,
|
|
1.0, &nearest,
|
|
NULL, NULL, NULL) >= 0)
|
|
{
|
|
snapped |= gimp_image_snap_distance (y1, nearest.y,
|
|
epsilon_y,
|
|
&mindist_y, ty1);
|
|
}
|
|
|
|
if (gimp_stroke_nearest_intersection_get (stroke, &coords2, &coords1,
|
|
1.0, &nearest,
|
|
NULL, NULL, NULL) >= 0)
|
|
{
|
|
dist = ABS (nearest.y - y2);
|
|
|
|
if (dist < MIN (epsilon_y, mindist_y))
|
|
{
|
|
mindist_y = dist;
|
|
*ty1 = RINT (y1 + (nearest.y - y2));
|
|
snapped = TRUE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
return snapped;
|
|
}
|
|
|
|
/* private functions */
|
|
|
|
/**
|
|
* gimp_image_snap_distance:
|
|
* @unsnapped: One coordinate of the unsnapped position
|
|
* @nearest: One coordinate of a snapping position candidate
|
|
* @epsilon: The snapping threshold
|
|
* @mindist: The distance to the currently closest snapping target
|
|
* @target: The currently closest snapping target
|
|
*
|
|
* Finds out if snapping occurs from position to a snapping candidate
|
|
* and sets the target accordingly.
|
|
*
|
|
* Return value: %TRUE if snapping occured, %FALSE otherwise
|
|
*/
|
|
static gboolean
|
|
gimp_image_snap_distance (const gdouble unsnapped,
|
|
const gdouble nearest,
|
|
const gdouble epsilon,
|
|
gdouble *mindist,
|
|
gdouble *target)
|
|
{
|
|
const gdouble dist = ABS (nearest - unsnapped);
|
|
|
|
if (dist < MIN (epsilon, *mindist))
|
|
{
|
|
*mindist = dist;
|
|
*target = nearest;
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
return FALSE;
|
|
}
|