gimp/app/core/gimpimage-sample-points.c

206 lines
5.9 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-sample-points.h"
#include "gimpimage-undo-push.h"
#include "gimp-intl.h"
/* public functions */
GimpSamplePoint *
gimp_image_add_sample_point_at_pos (GimpImage *gimage,
gint x,
gint y,
gboolean push_undo)
{
GimpSamplePoint *sample_point;
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
g_return_val_if_fail (x >= 0 && x < gimage->width, NULL);
g_return_val_if_fail (y >= 0 && y < gimage->height, NULL);
sample_point = g_new0 (GimpSamplePoint, 1);
sample_point->ref_count = 1;
sample_point->x = -1;
sample_point->y = -1;
sample_point->sample_point_ID = gimage->gimp->next_sample_point_ID++;
if (push_undo)
gimp_image_undo_push_image_sample_point (gimage, _("Add Sample_Point"),
sample_point);
gimp_image_add_sample_point (gimage, sample_point, x, y);
gimp_image_sample_point_unref (sample_point);
return sample_point;
}
GimpSamplePoint *
gimp_image_sample_point_ref (GimpSamplePoint *sample_point)
{
g_return_val_if_fail (sample_point != NULL, NULL);
sample_point->ref_count++;
return sample_point;
}
void
gimp_image_sample_point_unref (GimpSamplePoint *sample_point)
{
g_return_if_fail (sample_point != NULL);
sample_point->ref_count--;
if (sample_point->ref_count < 1)
g_free (sample_point);
}
void
gimp_image_add_sample_point (GimpImage *gimage,
GimpSamplePoint *sample_point,
gint x,
gint y)
{
g_return_if_fail (GIMP_IS_IMAGE (gimage));
g_return_if_fail (sample_point != NULL);
g_return_if_fail (x >= 0);
g_return_if_fail (y >= 0);
g_return_if_fail (x < gimage->width);
g_return_if_fail (y < gimage->height);
gimage->sample_points = g_list_append (gimage->sample_points, sample_point);
sample_point->x = x;
sample_point->y = y;
gimp_image_sample_point_ref (sample_point);
gimp_image_sample_point_added (gimage, sample_point);
gimp_image_update_sample_point (gimage, sample_point);
}
void
gimp_image_remove_sample_point (GimpImage *gimage,
GimpSamplePoint *sample_point,
gboolean push_undo)
{
GList *list;
g_return_if_fail (GIMP_IS_IMAGE (gimage));
g_return_if_fail (sample_point != NULL);
gimp_image_update_sample_point (gimage, sample_point);
if (push_undo)
gimp_image_undo_push_image_sample_point (gimage, _("Remove Sample Point"),
sample_point);
list = g_list_find (gimage->sample_points, sample_point);
if (list)
list = g_list_next (list);
gimage->sample_points = g_list_remove (gimage->sample_points, sample_point);
gimp_image_sample_point_removed (gimage, sample_point);
sample_point->x = -1;
sample_point->y = -1;
gimp_image_sample_point_unref (sample_point);
while (list)
{
gimp_image_update_sample_point (gimage, list->data);
list = g_list_next (list);
}
}
void
gimp_image_move_sample_point (GimpImage *gimage,
GimpSamplePoint *sample_point,
gint x,
gint y,
gboolean push_undo)
{
g_return_if_fail (GIMP_IS_IMAGE (gimage));
g_return_if_fail (sample_point != NULL);
g_return_if_fail (x >= 0);
g_return_if_fail (y >= 0);
g_return_if_fail (x < gimage->width);
g_return_if_fail (y < gimage->height);
if (push_undo)
gimp_image_undo_push_image_sample_point (gimage, _("Move Sample Point"),
sample_point);
gimp_image_update_sample_point (gimage, sample_point);
sample_point->x = x;
sample_point->y = y;
gimp_image_update_sample_point (gimage, sample_point);
}
GimpSamplePoint *
gimp_image_find_sample_point (GimpImage *gimage,
gdouble x,
gdouble y,
gdouble epsilon_x,
gdouble epsilon_y)
{
GList *list;
GimpSamplePoint *ret = NULL;
gdouble mindist = G_MAXDOUBLE;
g_return_val_if_fail (GIMP_IS_IMAGE (gimage), NULL);
g_return_val_if_fail (epsilon_x > 0 && epsilon_y > 0, NULL);
if (x < 0 || x >= gimage->width ||
y < 0 || y >= gimage->height)
{
return NULL;
}
for (list = gimage->sample_points; list; list = g_list_next (list))
{
GimpSamplePoint *sample_point = list->data;
gdouble dist;
if (sample_point->x < 0 || sample_point->y < 0)
continue;
dist = hypot ((sample_point->x + 0.5) - x,
(sample_point->y + 0.5) - y);
if (dist < MIN (epsilon_y, mindist))
{
mindist = dist;
ret = sample_point;
}
}
return ret;
}