mirror of https://github.com/GNOME/gimp.git
393 lines
9.6 KiB
C
393 lines
9.6 KiB
C
/* The GIMP -- an image manipulation program
|
|
* Copyright (C) 1995 Spencer Kimball and Peter Mattis
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
|
|
*/
|
|
|
|
#include "config.h"
|
|
|
|
#include <glib-object.h>
|
|
|
|
#include "core-types.h"
|
|
|
|
#include "gimp.h"
|
|
#include "gimpimage.h"
|
|
#include "gimpimage-grid.h"
|
|
#include "gimpimage-guides.h"
|
|
#include "gimpimage-snap.h"
|
|
|
|
#include "gimp-intl.h"
|
|
|
|
|
|
/* public functions */
|
|
|
|
|
|
gboolean
|
|
gimp_image_snap_x (GimpImage *gimage,
|
|
gdouble x,
|
|
gint *tx,
|
|
gdouble epsilon_x,
|
|
gboolean snap_to_guides,
|
|
gboolean snap_to_grid)
|
|
{
|
|
GList *list;
|
|
GimpGuide *guide;
|
|
GimpGrid *grid;
|
|
gdouble xspacing;
|
|
gdouble xoffset;
|
|
gdouble mindist = G_MAXDOUBLE;
|
|
gdouble dist;
|
|
gdouble i;
|
|
gboolean snapped = FALSE;
|
|
|
|
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), FALSE);
|
|
g_return_val_if_fail (tx != NULL, FALSE);
|
|
|
|
if (! snap_to_guides && ! snap_to_grid)
|
|
return FALSE;
|
|
|
|
*tx = ROUND (x);
|
|
|
|
if (x < 0 || x >= gimage->width)
|
|
return FALSE;
|
|
|
|
if (snap_to_guides && gimage->guides != NULL)
|
|
{
|
|
for (list = gimage->guides; list; list = g_list_next (list))
|
|
{
|
|
guide = (GimpGuide *) list->data;
|
|
|
|
if (guide->position < 0)
|
|
continue;
|
|
|
|
if (guide->orientation == GIMP_ORIENTATION_VERTICAL)
|
|
{
|
|
dist = ABS (guide->position - x);
|
|
|
|
if (dist < MIN (epsilon_x, mindist))
|
|
{
|
|
mindist = dist;
|
|
*tx = guide->position;
|
|
snapped = TRUE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (snap_to_grid && gimage->grid != NULL)
|
|
{
|
|
grid = gimp_image_get_grid (gimage);
|
|
|
|
g_object_get (grid,
|
|
"xspacing", &xspacing,
|
|
"xoffset", &xoffset,
|
|
NULL);
|
|
|
|
for (i = xoffset; i <= gimage->width; i += xspacing)
|
|
{
|
|
if (i < 0)
|
|
continue;
|
|
|
|
dist = ABS (i - x);
|
|
|
|
if (dist < MIN (epsilon_x, mindist))
|
|
{
|
|
mindist = dist;
|
|
*tx = i;
|
|
snapped = TRUE;
|
|
}
|
|
}
|
|
}
|
|
|
|
return snapped;
|
|
}
|
|
|
|
gboolean
|
|
gimp_image_snap_y (GimpImage *gimage,
|
|
gdouble y,
|
|
gint *ty,
|
|
gdouble epsilon_y,
|
|
gboolean snap_to_guides,
|
|
gboolean snap_to_grid)
|
|
{
|
|
GList *list;
|
|
GimpGuide *guide;
|
|
GimpGrid *grid;
|
|
gdouble yspacing;
|
|
gdouble yoffset;
|
|
gdouble mindist = G_MAXDOUBLE;
|
|
gdouble dist;
|
|
gdouble i;
|
|
gboolean snapped = FALSE;
|
|
|
|
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), FALSE);
|
|
g_return_val_if_fail (ty != NULL, FALSE);
|
|
|
|
if (! snap_to_guides && ! snap_to_grid)
|
|
return FALSE;
|
|
|
|
*ty = ROUND (y);
|
|
|
|
if (y < 0 || y >= gimage->height)
|
|
return FALSE;
|
|
|
|
if (snap_to_guides && gimage->guides != NULL)
|
|
{
|
|
for (list = gimage->guides; list; list = g_list_next (list))
|
|
{
|
|
guide = (GimpGuide *) list->data;
|
|
|
|
if (guide->position < 0)
|
|
continue;
|
|
|
|
if (guide->orientation == GIMP_ORIENTATION_HORIZONTAL)
|
|
{
|
|
dist = ABS (guide->position - y);
|
|
|
|
if (dist < MIN (epsilon_y, mindist))
|
|
{
|
|
mindist = dist;
|
|
*ty = guide->position;
|
|
snapped = TRUE;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (snap_to_grid && gimage->grid != NULL)
|
|
{
|
|
grid = gimp_image_get_grid (gimage);
|
|
|
|
g_object_get (grid,
|
|
"yspacing", &yspacing,
|
|
"yoffset", &yoffset,
|
|
NULL);
|
|
|
|
for (i = yoffset; i <= gimage->height; i += yspacing)
|
|
{
|
|
if (i < 0)
|
|
continue;
|
|
|
|
dist = ABS (i - y);
|
|
|
|
if (dist < MIN (epsilon_y, mindist))
|
|
{
|
|
mindist = dist;
|
|
*ty = i;
|
|
snapped = TRUE;
|
|
}
|
|
}
|
|
}
|
|
|
|
return snapped;
|
|
}
|
|
|
|
gboolean
|
|
gimp_image_snap_point (GimpImage *gimage,
|
|
gdouble x,
|
|
gdouble y,
|
|
gint *tx,
|
|
gint *ty,
|
|
gdouble epsilon_x,
|
|
gdouble epsilon_y,
|
|
gboolean snap_to_guides,
|
|
gboolean snap_to_grid)
|
|
{
|
|
GList *list;
|
|
GimpGuide *guide;
|
|
GimpGrid *grid;
|
|
gdouble xspacing, yspacing;
|
|
gdouble xoffset, yoffset;
|
|
gdouble minxdist, minydist;
|
|
gdouble dist;
|
|
gdouble i;
|
|
gboolean snapped = FALSE;
|
|
|
|
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), FALSE);
|
|
g_return_val_if_fail (tx != NULL, FALSE);
|
|
g_return_val_if_fail (ty != NULL, FALSE);
|
|
|
|
if (! snap_to_guides && ! snap_to_grid)
|
|
return FALSE;
|
|
|
|
*tx = ROUND (x);
|
|
*ty = ROUND (y);
|
|
|
|
if (x < 0 || x >= gimage->width ||
|
|
y < 0 || y >= gimage->height)
|
|
{
|
|
return FALSE;
|
|
}
|
|
|
|
minxdist = G_MAXDOUBLE;
|
|
minydist = G_MAXDOUBLE;
|
|
|
|
if (snap_to_guides && gimage->guides != NULL)
|
|
{
|
|
for (list = gimage->guides; list; list = g_list_next (list))
|
|
{
|
|
guide = (GimpGuide *) list->data;
|
|
|
|
if (guide->position < 0)
|
|
continue;
|
|
|
|
switch (guide->orientation)
|
|
{
|
|
case GIMP_ORIENTATION_HORIZONTAL:
|
|
dist = ABS (guide->position - y);
|
|
|
|
if (dist < MIN (epsilon_y, minydist))
|
|
{
|
|
minydist = dist;
|
|
*ty = guide->position;
|
|
snapped = TRUE;
|
|
}
|
|
break;
|
|
|
|
case GIMP_ORIENTATION_VERTICAL:
|
|
dist = ABS (guide->position - x);
|
|
|
|
if (dist < MIN (epsilon_x, minxdist))
|
|
{
|
|
minxdist = dist;
|
|
*tx = guide->position;
|
|
snapped = TRUE;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (snap_to_grid && gimage->grid != NULL)
|
|
{
|
|
grid = gimp_image_get_grid (gimage);
|
|
|
|
g_object_get (grid,
|
|
"xspacing", &xspacing,
|
|
"yspacing", &yspacing,
|
|
"xoffset", &xoffset,
|
|
"yoffset", &yoffset,
|
|
NULL);
|
|
|
|
for (i = xoffset; i <= gimage->width; i += xspacing)
|
|
{
|
|
if (i < 0)
|
|
continue;
|
|
|
|
dist = ABS (i - x);
|
|
|
|
if (dist < MIN (epsilon_x, minxdist))
|
|
{
|
|
minxdist = dist;
|
|
*tx = i;
|
|
snapped = TRUE;
|
|
}
|
|
}
|
|
|
|
for (i = yoffset; i <= gimage->height; i += yspacing)
|
|
{
|
|
if (i < 0)
|
|
continue;
|
|
|
|
dist = ABS (i - y);
|
|
|
|
if (dist < MIN (epsilon_y, minydist))
|
|
{
|
|
minydist = dist;
|
|
*ty = i;
|
|
snapped = TRUE;
|
|
}
|
|
}
|
|
}
|
|
|
|
return snapped;
|
|
}
|
|
|
|
gboolean
|
|
gimp_image_snap_rectangle (GimpImage *gimage,
|
|
gdouble x1,
|
|
gdouble y1,
|
|
gdouble x2,
|
|
gdouble y2,
|
|
gint *tx1,
|
|
gint *ty1,
|
|
gdouble epsilon_x,
|
|
gdouble epsilon_y,
|
|
gboolean snap_to_guides,
|
|
gboolean snap_to_grid)
|
|
{
|
|
gint nx1, ny1;
|
|
gint nx2, ny2;
|
|
gboolean snap1, snap2, snap3, snap4;
|
|
|
|
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), FALSE);
|
|
g_return_val_if_fail (tx1 != NULL, FALSE);
|
|
g_return_val_if_fail (ty1 != NULL, FALSE);
|
|
|
|
if (! snap_to_guides && ! snap_to_grid)
|
|
return FALSE;
|
|
|
|
*tx1 = ROUND (x1);
|
|
*ty1 = ROUND (y1);
|
|
|
|
snap1 = gimp_image_snap_x (gimage, x1, &nx1,
|
|
epsilon_x,
|
|
snap_to_guides,
|
|
snap_to_grid);
|
|
snap2 = gimp_image_snap_x (gimage, x2, &nx2,
|
|
epsilon_x,
|
|
snap_to_guides,
|
|
snap_to_grid);
|
|
snap3 = gimp_image_snap_y (gimage, y1, &ny1,
|
|
epsilon_y,
|
|
snap_to_guides,
|
|
snap_to_grid);
|
|
snap4 = gimp_image_snap_y (gimage, y2, &ny2,
|
|
epsilon_y,
|
|
snap_to_guides,
|
|
snap_to_grid);
|
|
|
|
if (snap1 && snap2)
|
|
{
|
|
if (ABS (x1 - nx1) > ABS (x2 - nx2))
|
|
snap1 = FALSE;
|
|
else
|
|
snap2 = FALSE;
|
|
}
|
|
|
|
if (snap1)
|
|
*tx1 = nx1;
|
|
else if (snap2)
|
|
*tx1 = ROUND (x1 + (nx2 - x2));
|
|
|
|
if (snap3 && snap4)
|
|
{
|
|
if (ABS (y1 - ny1) > ABS (y2 - ny2))
|
|
snap3 = FALSE;
|
|
else
|
|
snap4 = FALSE;
|
|
}
|
|
|
|
if (snap3)
|
|
*ty1 = ny1;
|
|
else if (snap4)
|
|
*ty1 = ROUND (y1 + (ny2 - y2));
|
|
|
|
return (snap1 || snap2 || snap3 || snap4);
|
|
}
|