688 lines
22 KiB
C
688 lines
22 KiB
C
/* 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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* pikacanvastransformguides.c
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* Copyright (C) 2011 Michael Natterer <mitch@gimp.org>
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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 <gegl.h>
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#include <gtk/gtk.h>
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#include "libpikabase/pikabase.h"
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#include "libpikamath/pikamath.h"
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#include "display-types.h"
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#include "core/pika-transform-utils.h"
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#include "core/pika-utils.h"
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#include "pikacanvastransformguides.h"
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#include "pikadisplayshell.h"
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#define SQRT5 2.236067977
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enum
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{
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PROP_0,
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PROP_TRANSFORM,
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PROP_X1,
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PROP_Y1,
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PROP_X2,
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PROP_Y2,
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PROP_TYPE,
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PROP_N_GUIDES,
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PROP_CLIP
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};
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typedef struct _PikaCanvasTransformGuidesPrivate PikaCanvasTransformGuidesPrivate;
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struct _PikaCanvasTransformGuidesPrivate
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{
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PikaMatrix3 transform;
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gdouble x1, y1;
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gdouble x2, y2;
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PikaGuidesType type;
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gint n_guides;
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gboolean clip;
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};
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#define GET_PRIVATE(transform) \
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((PikaCanvasTransformGuidesPrivate *) pika_canvas_transform_guides_get_instance_private ((PikaCanvasTransformGuides *) (transform)))
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/* local function prototypes */
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static void pika_canvas_transform_guides_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec);
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static void pika_canvas_transform_guides_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec);
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static void pika_canvas_transform_guides_draw (PikaCanvasItem *item,
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cairo_t *cr);
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static cairo_region_t * pika_canvas_transform_guides_get_extents (PikaCanvasItem *item);
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G_DEFINE_TYPE_WITH_PRIVATE (PikaCanvasTransformGuides,
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pika_canvas_transform_guides, PIKA_TYPE_CANVAS_ITEM)
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#define parent_class pika_canvas_transform_guides_parent_class
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static void
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pika_canvas_transform_guides_class_init (PikaCanvasTransformGuidesClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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PikaCanvasItemClass *item_class = PIKA_CANVAS_ITEM_CLASS (klass);
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object_class->set_property = pika_canvas_transform_guides_set_property;
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object_class->get_property = pika_canvas_transform_guides_get_property;
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item_class->draw = pika_canvas_transform_guides_draw;
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item_class->get_extents = pika_canvas_transform_guides_get_extents;
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g_object_class_install_property (object_class, PROP_TRANSFORM,
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pika_param_spec_matrix3 ("transform",
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NULL, NULL,
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NULL,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_X1,
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g_param_spec_double ("x1",
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NULL, NULL,
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-PIKA_MAX_IMAGE_SIZE,
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PIKA_MAX_IMAGE_SIZE,
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0.0,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_Y1,
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g_param_spec_double ("y1",
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NULL, NULL,
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-PIKA_MAX_IMAGE_SIZE,
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PIKA_MAX_IMAGE_SIZE,
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0.0,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_X2,
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g_param_spec_double ("x2",
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NULL, NULL,
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-PIKA_MAX_IMAGE_SIZE,
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PIKA_MAX_IMAGE_SIZE,
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0.0,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_Y2,
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g_param_spec_double ("y2",
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NULL, NULL,
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-PIKA_MAX_IMAGE_SIZE,
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PIKA_MAX_IMAGE_SIZE,
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0.0,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_TYPE,
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g_param_spec_enum ("type", NULL, NULL,
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PIKA_TYPE_GUIDES_TYPE,
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PIKA_GUIDES_NONE,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_N_GUIDES,
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g_param_spec_int ("n-guides", NULL, NULL,
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1, 128, 4,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_CLIP,
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g_param_spec_boolean ("clip", NULL, NULL,
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FALSE,
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PIKA_PARAM_READWRITE));
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}
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static void
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pika_canvas_transform_guides_init (PikaCanvasTransformGuides *transform)
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{
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}
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static void
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pika_canvas_transform_guides_set_property (GObject *object,
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guint property_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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PikaCanvasTransformGuidesPrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_TRANSFORM:
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{
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PikaMatrix3 *transform = g_value_get_boxed (value);
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if (transform)
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private->transform = *transform;
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else
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pika_matrix3_identity (&private->transform);
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}
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break;
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case PROP_X1:
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private->x1 = g_value_get_double (value);
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break;
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case PROP_Y1:
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private->y1 = g_value_get_double (value);
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break;
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case PROP_X2:
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private->x2 = g_value_get_double (value);
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break;
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case PROP_Y2:
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private->y2 = g_value_get_double (value);
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break;
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case PROP_TYPE:
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private->type = g_value_get_enum (value);
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break;
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case PROP_N_GUIDES:
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private->n_guides = g_value_get_int (value);
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break;
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case PROP_CLIP:
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private->clip = g_value_get_boolean (value);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static void
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pika_canvas_transform_guides_get_property (GObject *object,
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guint property_id,
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GValue *value,
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GParamSpec *pspec)
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{
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PikaCanvasTransformGuidesPrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_TRANSFORM:
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g_value_set_boxed (value, &private->transform);
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break;
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case PROP_X1:
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g_value_set_double (value, private->x1);
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break;
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case PROP_Y1:
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g_value_set_double (value, private->y1);
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break;
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case PROP_X2:
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g_value_set_double (value, private->x2);
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break;
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case PROP_Y2:
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g_value_set_double (value, private->y2);
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break;
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case PROP_TYPE:
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g_value_set_enum (value, private->type);
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break;
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case PROP_N_GUIDES:
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g_value_set_int (value, private->n_guides);
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break;
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case PROP_CLIP:
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g_value_set_boolean (value, private->clip);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static gboolean
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pika_canvas_transform_guides_transform (PikaCanvasItem *item,
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PikaVector2 *t_vertices,
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gint *n_t_vertices)
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{
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PikaCanvasTransformGuidesPrivate *private = GET_PRIVATE (item);
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PikaVector2 vertices[4];
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vertices[0] = (PikaVector2) { private->x1, private->y1 };
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vertices[1] = (PikaVector2) { private->x2, private->y1 };
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vertices[2] = (PikaVector2) { private->x2, private->y2 };
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vertices[3] = (PikaVector2) { private->x1, private->y2 };
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if (private->clip)
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{
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pika_transform_polygon (&private->transform, vertices, 4, TRUE,
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t_vertices, n_t_vertices);
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return TRUE;
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}
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else
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{
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gint i;
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for (i = 0; i < 4; i++)
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{
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pika_matrix3_transform_point (&private->transform,
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vertices[i].x, vertices[i].y,
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&t_vertices[i].x, &t_vertices[i].y);
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}
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*n_t_vertices = 4;
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return pika_transform_polygon_is_convex (t_vertices[0].x, t_vertices[0].y,
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t_vertices[1].x, t_vertices[1].y,
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t_vertices[3].x, t_vertices[3].y,
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t_vertices[2].x, t_vertices[2].y);
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}
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}
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static void
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draw_line (cairo_t *cr,
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PikaCanvasItem *item,
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PikaMatrix3 *transform,
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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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{
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PikaCanvasTransformGuidesPrivate *private = GET_PRIVATE (item);
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PikaVector2 vertices[2];
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PikaVector2 t_vertices[2];
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gint n_t_vertices;
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vertices[0] = (PikaVector2) { x1, y1 };
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vertices[1] = (PikaVector2) { x2, y2 };
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if (private->clip)
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{
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pika_transform_polygon (transform, vertices, 2, FALSE,
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t_vertices, &n_t_vertices);
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}
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else
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{
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gint i;
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for (i = 0; i < 2; i++)
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{
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pika_matrix3_transform_point (transform,
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vertices[i].x, vertices[i].y,
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&t_vertices[i].x, &t_vertices[i].y);
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}
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n_t_vertices = 2;
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}
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if (n_t_vertices == 2)
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{
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gint i;
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for (i = 0; i < 2; i++)
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{
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PikaVector2 v;
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pika_canvas_item_transform_xy_f (item,
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t_vertices[i].x, t_vertices[i].y,
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&v.x, &v.y);
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v.x = floor (v.x) + 0.5;
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v.y = floor (v.y) + 0.5;
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if (i == 0)
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cairo_move_to (cr, v.x, v.y);
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else
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cairo_line_to (cr, v.x, v.y);
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}
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}
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}
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static void
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draw_hline (cairo_t *cr,
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PikaCanvasItem *item,
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PikaMatrix3 *transform,
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gdouble x1,
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gdouble x2,
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gdouble y)
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{
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draw_line (cr, item, transform, x1, y, x2, y);
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}
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static void
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draw_vline (cairo_t *cr,
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PikaCanvasItem *item,
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PikaMatrix3 *transform,
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gdouble y1,
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gdouble y2,
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gdouble x)
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{
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draw_line (cr, item, transform, x, y1, x, y2);
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}
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static void
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pika_canvas_transform_guides_draw (PikaCanvasItem *item,
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cairo_t *cr)
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{
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PikaCanvasTransformGuidesPrivate *private = GET_PRIVATE (item);
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PikaVector2 t_vertices[5];
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gint n_t_vertices;
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gboolean convex;
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gint i;
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convex = pika_canvas_transform_guides_transform (item,
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t_vertices, &n_t_vertices);
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if (n_t_vertices < 2)
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return;
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for (i = 0; i < n_t_vertices; i++)
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{
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PikaVector2 v;
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pika_canvas_item_transform_xy_f (item, t_vertices[i].x, t_vertices[i].y,
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&v.x, &v.y);
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v.x = floor (v.x) + 0.5;
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v.y = floor (v.y) + 0.5;
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if (i == 0)
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cairo_move_to (cr, v.x, v.y);
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else
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cairo_line_to (cr, v.x, v.y);
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}
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cairo_close_path (cr);
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if (! convex || n_t_vertices < 3)
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{
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_pika_canvas_item_stroke (item, cr);
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return;
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}
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switch (private->type)
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{
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case PIKA_GUIDES_NONE:
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break;
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case PIKA_GUIDES_CENTER_LINES:
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draw_hline (cr, item, &private->transform,
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private->x1, private->x2, (private->y1 + private->y2) / 2);
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draw_vline (cr, item, &private->transform,
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private->y1, private->y2, (private->x1 + private->x2) / 2);
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break;
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case PIKA_GUIDES_THIRDS:
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draw_hline (cr, item, &private->transform,
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private->x1, private->x2, (2 * private->y1 + private->y2) / 3);
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draw_hline (cr, item, &private->transform,
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private->x1, private->x2, (private->y1 + 2 * private->y2) / 3);
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draw_vline (cr, item, &private->transform,
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private->y1, private->y2, (2 * private->x1 + private->x2) / 3);
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draw_vline (cr, item, &private->transform,
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private->y1, private->y2, (private->x1 + 2 * private->x2) / 3);
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break;
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case PIKA_GUIDES_FIFTHS:
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for (i = 0; i < 5; i++)
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{
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draw_hline (cr, item, &private->transform,
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private->x1, private->x2,
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private->y1 + i * (private->y2 - private->y1) / 5);
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draw_vline (cr, item, &private->transform,
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private->y1, private->y2,
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private->x1 + i * (private->x2 - private->x1) / 5);
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}
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break;
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case PIKA_GUIDES_GOLDEN:
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draw_hline (cr, item, &private->transform,
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private->x1, private->x2,
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(2 * private->y1 + (1 + SQRT5) * private->y2) / (3 + SQRT5));
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draw_hline (cr, item, &private->transform,
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private->x1, private->x2,
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((1 + SQRT5) * private->y1 + 2 * private->y2) / (3 + SQRT5));
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draw_vline (cr, item, &private->transform,
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private->y1, private->y2,
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(2 * private->x1 + (1 + SQRT5) * private->x2) / (3 + SQRT5));
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draw_vline (cr, item, &private->transform,
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private->y1, private->y2,
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((1 + SQRT5) * private->x1 + 2 * private->x2) / (3 + SQRT5));
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break;
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/* This code implements the method of diagonals discovered by
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* Edwin Westhoff - see http://www.diagonalmethod.info/
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*/
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case PIKA_GUIDES_DIAGONALS:
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{
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/* the side of the largest square that can be
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* fitted in whole into the rectangle (x1, y1), (x2, y2)
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*/
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const gdouble square_side = MIN (private->x2 - private->x1,
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private->y2 - private->y1);
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/* diagonal from the top-left edge */
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draw_line (cr, item, &private->transform,
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private->x1, private->y1,
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private->x1 + square_side,
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private->y1 + square_side);
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/* diagonal from the top-right edge */
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draw_line (cr, item, &private->transform,
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private->x2, private->y1,
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private->x2 - square_side,
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private->y1 + square_side);
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/* diagonal from the bottom-left edge */
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draw_line (cr, item, &private->transform,
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private->x1, private->y2,
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private->x1 + square_side,
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private->y2 - square_side);
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/* diagonal from the bottom-right edge */
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draw_line (cr, item, &private->transform,
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private->x2, private->y2,
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private->x2 - square_side,
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private->y2 - square_side);
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}
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break;
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case PIKA_GUIDES_N_LINES:
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case PIKA_GUIDES_SPACING:
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{
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gint width, height;
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gint ngx, ngy;
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|
width = MAX (1, private->x2 - private->x1);
|
|
height = MAX (1, private->y2 - private->y1);
|
|
|
|
/* the MIN() in the code below limits the grid to one line
|
|
* every 5 image pixels, see bug 772667.
|
|
*/
|
|
|
|
if (private->type == PIKA_GUIDES_N_LINES)
|
|
{
|
|
if (width <= height)
|
|
{
|
|
ngx = private->n_guides;
|
|
ngx = MIN (ngx, width / 5);
|
|
|
|
ngy = ngx * MAX (1, height / width);
|
|
ngy = MIN (ngy, height / 5);
|
|
}
|
|
else
|
|
{
|
|
ngy = private->n_guides;
|
|
ngy = MIN (ngy, height / 5);
|
|
|
|
ngx = ngy * MAX (1, width / height);
|
|
ngx = MIN (ngx, width / 5);
|
|
}
|
|
}
|
|
else /* PIKA_GUIDES_SPACING */
|
|
{
|
|
gint grid_size = MAX (2, private->n_guides);
|
|
|
|
ngx = width / grid_size;
|
|
ngx = MIN (ngx, width / 5);
|
|
|
|
ngy = height / grid_size;
|
|
ngy = MIN (ngy, height / 5);
|
|
}
|
|
|
|
for (i = 1; i <= ngx; i++)
|
|
{
|
|
gdouble x = private->x1 + (((gdouble) i) / (ngx + 1) *
|
|
(private->x2 - private->x1));
|
|
|
|
draw_line (cr, item, &private->transform,
|
|
x, private->y1,
|
|
x, private->y2);
|
|
}
|
|
|
|
for (i = 1; i <= ngy; i++)
|
|
{
|
|
gdouble y = private->y1 + (((gdouble) i) / (ngy + 1) *
|
|
(private->y2 - private->y1));
|
|
|
|
draw_line (cr, item, &private->transform,
|
|
private->x1, y,
|
|
private->x2, y);
|
|
}
|
|
}
|
|
}
|
|
|
|
_pika_canvas_item_stroke (item, cr);
|
|
}
|
|
|
|
static cairo_region_t *
|
|
pika_canvas_transform_guides_get_extents (PikaCanvasItem *item)
|
|
{
|
|
PikaVector2 t_vertices[5];
|
|
gint n_t_vertices;
|
|
PikaVector2 top_left;
|
|
PikaVector2 bottom_right;
|
|
cairo_rectangle_int_t extents;
|
|
gint i;
|
|
|
|
pika_canvas_transform_guides_transform (item, t_vertices, &n_t_vertices);
|
|
|
|
if (n_t_vertices < 2)
|
|
return cairo_region_create ();
|
|
|
|
for (i = 0; i < n_t_vertices; i++)
|
|
{
|
|
PikaVector2 v;
|
|
|
|
pika_canvas_item_transform_xy_f (item,
|
|
t_vertices[i].x, t_vertices[i].y,
|
|
&v.x, &v.y);
|
|
|
|
if (i == 0)
|
|
{
|
|
top_left = bottom_right = v;
|
|
}
|
|
else
|
|
{
|
|
top_left.x = MIN (top_left.x, v.x);
|
|
top_left.y = MIN (top_left.y, v.y);
|
|
|
|
bottom_right.x = MAX (bottom_right.x, v.x);
|
|
bottom_right.y = MAX (bottom_right.y, v.y);
|
|
}
|
|
}
|
|
|
|
extents.x = (gint) floor (top_left.x - 1.5);
|
|
extents.y = (gint) floor (top_left.y - 1.5);
|
|
extents.width = (gint) ceil (bottom_right.x + 1.5) - extents.x;
|
|
extents.height = (gint) ceil (bottom_right.y + 1.5) - extents.y;
|
|
|
|
return cairo_region_create_rectangle (&extents);
|
|
}
|
|
|
|
PikaCanvasItem *
|
|
pika_canvas_transform_guides_new (PikaDisplayShell *shell,
|
|
const PikaMatrix3 *transform,
|
|
gdouble x1,
|
|
gdouble y1,
|
|
gdouble x2,
|
|
gdouble y2,
|
|
PikaGuidesType type,
|
|
gint n_guides,
|
|
gboolean clip)
|
|
{
|
|
g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
|
|
|
|
return g_object_new (PIKA_TYPE_CANVAS_TRANSFORM_GUIDES,
|
|
"shell", shell,
|
|
"transform", transform,
|
|
"x1", x1,
|
|
"y1", y1,
|
|
"x2", x2,
|
|
"y2", y2,
|
|
"type", type,
|
|
"n-guides", n_guides,
|
|
"clip", clip,
|
|
NULL);
|
|
}
|
|
|
|
void
|
|
pika_canvas_transform_guides_set (PikaCanvasItem *guides,
|
|
const PikaMatrix3 *transform,
|
|
gdouble x1,
|
|
gdouble y1,
|
|
gdouble x2,
|
|
gdouble y2,
|
|
PikaGuidesType type,
|
|
gint n_guides,
|
|
gboolean clip)
|
|
{
|
|
g_return_if_fail (PIKA_IS_CANVAS_TRANSFORM_GUIDES (guides));
|
|
|
|
pika_canvas_item_begin_change (guides);
|
|
|
|
g_object_set (guides,
|
|
"transform", transform,
|
|
"x1", x1,
|
|
"y1", y1,
|
|
"x2", x2,
|
|
"y2", y2,
|
|
"type", type,
|
|
"n-guides", n_guides,
|
|
"clip", clip,
|
|
NULL);
|
|
|
|
pika_canvas_item_end_change (guides);
|
|
}
|
