386 lines
10 KiB
C
386 lines
10 KiB
C
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/* PIKA - Photo and Image Kooker Application
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* a rebranding of The GNU Image Manipulation Program (created with heckimp)
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* A derived work which may be trivial. However, any changes may be (C)2023 by Aldercone Studio
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*
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* Original copyright, applying to most contents (license remains unchanged):
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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 <https://www.gnu.org/licenses/>.
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*/
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#include "config.h"
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include <gegl.h>
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#include "libpikamath/pikamath.h"
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#include "core-types.h"
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#include "pikagrouplayer.h"
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#include "pikaguide.h"
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#include "pikaimage.h"
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#include "pikaimage-pick-item.h"
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#include "pikaimage-private.h"
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#include "pikapickable.h"
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#include "pikasamplepoint.h"
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#include "text/pikatextlayer.h"
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#include "vectors/pikastroke.h"
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#include "vectors/pikavectors.h"
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PikaLayer *
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pika_image_pick_layer (PikaImage *image,
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gint x,
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gint y,
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PikaLayer *previously_picked)
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{
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GList *all_layers;
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GList *list;
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gint off_x, off_y;
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gint tries = 1;
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g_return_val_if_fail (PIKA_IS_IMAGE (image), NULL);
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all_layers = pika_image_get_layer_list (image);
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if (previously_picked)
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{
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pika_item_get_offset (PIKA_ITEM (previously_picked), &off_x, &off_y);
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if (pika_pickable_get_opacity_at (PIKA_PICKABLE (previously_picked),
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x - off_x, y - off_y) <= 0.25)
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previously_picked = NULL;
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else
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tries++;
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}
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while (tries)
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{
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for (list = all_layers; list; list = g_list_next (list))
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{
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PikaLayer *layer = list->data;
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if (previously_picked)
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{
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/* Take the first layer with a pixel at given coordinates
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* after the previously picked one.
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*/
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if (layer == previously_picked)
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previously_picked = NULL;
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continue;
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}
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pika_item_get_offset (PIKA_ITEM (layer), &off_x, &off_y);
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if (pika_pickable_get_opacity_at (PIKA_PICKABLE (layer),
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x - off_x, y - off_y) > 0.25)
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{
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g_list_free (all_layers);
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return layer;
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}
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}
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tries--;
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}
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g_list_free (all_layers);
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return NULL;
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}
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PikaLayer *
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pika_image_pick_layer_by_bounds (PikaImage *image,
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gint x,
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gint y)
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{
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GList *all_layers;
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GList *list;
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g_return_val_if_fail (PIKA_IS_IMAGE (image), NULL);
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all_layers = pika_image_get_layer_list (image);
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for (list = all_layers; list; list = g_list_next (list))
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{
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PikaLayer *layer = list->data;
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if (pika_item_is_visible (PIKA_ITEM (layer)))
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{
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gint off_x, off_y;
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gint width, height;
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pika_item_get_offset (PIKA_ITEM (layer), &off_x, &off_y);
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width = pika_item_get_width (PIKA_ITEM (layer));
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height = pika_item_get_height (PIKA_ITEM (layer));
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if (x >= off_x &&
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y >= off_y &&
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x < off_x + width &&
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y < off_y + height)
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{
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g_list_free (all_layers);
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return layer;
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}
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}
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}
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g_list_free (all_layers);
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return NULL;
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}
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PikaTextLayer *
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pika_image_pick_text_layer (PikaImage *image,
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gint x,
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gint y)
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{
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GList *all_layers;
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GList *list;
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g_return_val_if_fail (PIKA_IS_IMAGE (image), NULL);
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all_layers = pika_image_get_layer_list (image);
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for (list = all_layers; list; list = g_list_next (list))
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{
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PikaLayer *layer = list->data;
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gint off_x, off_y;
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pika_item_get_offset (PIKA_ITEM (layer), &off_x, &off_y);
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if (PIKA_IS_TEXT_LAYER (layer) &&
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x >= off_x &&
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y >= off_y &&
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x < off_x + pika_item_get_width (PIKA_ITEM (layer)) &&
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y < off_y + pika_item_get_height (PIKA_ITEM (layer)) &&
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pika_item_is_visible (PIKA_ITEM (layer)))
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{
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g_list_free (all_layers);
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return PIKA_TEXT_LAYER (layer);
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}
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else if (pika_pickable_get_opacity_at (PIKA_PICKABLE (layer),
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x - off_x, y - off_y) > 0.25)
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{
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/* a normal layer covers any possible text layers below,
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* bail out
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*/
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break;
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}
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}
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g_list_free (all_layers);
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return NULL;
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}
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PikaVectors *
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pika_image_pick_vectors (PikaImage *image,
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gdouble x,
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gdouble y,
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gdouble epsilon_x,
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gdouble epsilon_y)
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{
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PikaVectors *ret = NULL;
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GList *all_vectors;
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GList *list;
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gdouble mindist = G_MAXDOUBLE;
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g_return_val_if_fail (PIKA_IS_IMAGE (image), NULL);
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all_vectors = pika_image_get_vectors_list (image);
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for (list = all_vectors; list; list = g_list_next (list))
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{
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PikaVectors *vectors = list->data;
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if (pika_item_is_visible (PIKA_ITEM (vectors)))
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{
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PikaStroke *stroke = NULL;
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PikaCoords coords = PIKA_COORDS_DEFAULT_VALUES;
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while ((stroke = pika_vectors_stroke_get_next (vectors, stroke)))
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{
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gdouble dist;
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coords.x = x;
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coords.y = y;
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dist = pika_stroke_nearest_point_get (stroke, &coords, 1.0,
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NULL, NULL, NULL, NULL);
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if (dist >= 0.0 &&
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dist < MIN (epsilon_y, mindist))
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{
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mindist = dist;
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ret = vectors;
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}
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}
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}
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}
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g_list_free (all_vectors);
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return ret;
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}
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static PikaGuide *
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pika_image_pick_guide_internal (PikaImage *image,
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gdouble x,
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gdouble y,
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gdouble epsilon_x,
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gdouble epsilon_y,
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PikaOrientationType orientation)
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{
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GList *list;
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PikaGuide *ret = NULL;
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gdouble mindist = G_MAXDOUBLE;
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for (list = PIKA_IMAGE_GET_PRIVATE (image)->guides;
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list;
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list = g_list_next (list))
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{
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PikaGuide *guide = list->data;
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gint position = pika_guide_get_position (guide);
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gdouble dist;
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switch (pika_guide_get_orientation (guide))
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{
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case PIKA_ORIENTATION_HORIZONTAL:
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if (orientation == PIKA_ORIENTATION_HORIZONTAL ||
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orientation == PIKA_ORIENTATION_UNKNOWN)
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{
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dist = ABS (position - y);
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if (dist < MIN (epsilon_y, mindist))
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{
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mindist = dist;
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ret = guide;
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}
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}
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break;
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/* mindist always is in vertical resolution to make it comparable */
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case PIKA_ORIENTATION_VERTICAL:
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if (orientation == PIKA_ORIENTATION_VERTICAL ||
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orientation == PIKA_ORIENTATION_UNKNOWN)
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{
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dist = ABS (position - x);
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if (dist < MIN (epsilon_x, mindist / epsilon_y * epsilon_x))
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{
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mindist = dist * epsilon_y / epsilon_x;
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ret = guide;
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}
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}
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break;
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default:
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continue;
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}
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}
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return ret;
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}
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PikaGuide *
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pika_image_pick_guide (PikaImage *image,
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gdouble x,
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gdouble y,
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gdouble epsilon_x,
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gdouble epsilon_y)
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{
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g_return_val_if_fail (PIKA_IS_IMAGE (image), NULL);
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g_return_val_if_fail (epsilon_x > 0 && epsilon_y > 0, NULL);
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return pika_image_pick_guide_internal (image, x, y, epsilon_x, epsilon_y,
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PIKA_ORIENTATION_UNKNOWN);
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}
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GList *
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pika_image_pick_guides (PikaImage *image,
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gdouble x,
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gdouble y,
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gdouble epsilon_x,
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gdouble epsilon_y)
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{
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PikaGuide *guide;
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GList *result = NULL;
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g_return_val_if_fail (PIKA_IS_IMAGE (image), NULL);
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g_return_val_if_fail (epsilon_x > 0 && epsilon_y > 0, NULL);
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guide = pika_image_pick_guide_internal (image, x, y, epsilon_x, epsilon_y,
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PIKA_ORIENTATION_HORIZONTAL);
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if (guide)
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result = g_list_append (result, guide);
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guide = pika_image_pick_guide_internal (image, x, y, epsilon_x, epsilon_y,
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PIKA_ORIENTATION_VERTICAL);
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if (guide)
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result = g_list_append (result, guide);
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return result;
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}
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PikaSamplePoint *
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pika_image_pick_sample_point (PikaImage *image,
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gdouble x,
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gdouble y,
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gdouble epsilon_x,
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gdouble epsilon_y)
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{
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GList *list;
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PikaSamplePoint *ret = NULL;
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gdouble mindist = G_MAXDOUBLE;
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g_return_val_if_fail (PIKA_IS_IMAGE (image), NULL);
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g_return_val_if_fail (epsilon_x > 0 && epsilon_y > 0, NULL);
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if (x < 0 || x >= pika_image_get_width (image) ||
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y < 0 || y >= pika_image_get_height (image))
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{
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return NULL;
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}
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for (list = PIKA_IMAGE_GET_PRIVATE (image)->sample_points;
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list;
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list = g_list_next (list))
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{
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PikaSamplePoint *sample_point = list->data;
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gint sp_x;
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gint sp_y;
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gdouble dist;
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pika_sample_point_get_position (sample_point, &sp_x, &sp_y);
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if (sp_x < 0 || sp_y < 0)
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continue;
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dist = hypot ((sp_x + 0.5) - x,
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(sp_y + 0.5) - y);
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if (dist < MIN (epsilon_y, mindist))
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{
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mindist = dist;
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ret = sample_point;
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}
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}
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return ret;
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}
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