427 lines
14 KiB
C
427 lines
14 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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* pikacanvasrectangleguides.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 "pikacanvasrectangleguides.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_X,
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PROP_Y,
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PROP_WIDTH,
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PROP_HEIGHT,
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PROP_TYPE,
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PROP_N_GUIDES
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};
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typedef struct _PikaCanvasRectangleGuidesPrivate PikaCanvasRectangleGuidesPrivate;
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struct _PikaCanvasRectangleGuidesPrivate
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{
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gdouble x;
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gdouble y;
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gdouble width;
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gdouble height;
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PikaGuidesType type;
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gint n_guides;
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};
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#define GET_PRIVATE(rectangle) \
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((PikaCanvasRectangleGuidesPrivate *) pika_canvas_rectangle_guides_get_instance_private ((PikaCanvasRectangleGuides *) (rectangle)))
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/* local function prototypes */
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static void pika_canvas_rectangle_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_rectangle_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_rectangle_guides_draw (PikaCanvasItem *item,
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cairo_t *cr);
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static cairo_region_t * pika_canvas_rectangle_guides_get_extents (PikaCanvasItem *item);
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G_DEFINE_TYPE_WITH_PRIVATE (PikaCanvasRectangleGuides,
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pika_canvas_rectangle_guides, PIKA_TYPE_CANVAS_ITEM)
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#define parent_class pika_canvas_rectangle_guides_parent_class
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static void
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pika_canvas_rectangle_guides_class_init (PikaCanvasRectangleGuidesClass *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_rectangle_guides_set_property;
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object_class->get_property = pika_canvas_rectangle_guides_get_property;
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item_class->draw = pika_canvas_rectangle_guides_draw;
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item_class->get_extents = pika_canvas_rectangle_guides_get_extents;
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g_object_class_install_property (object_class, PROP_X,
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g_param_spec_double ("x", NULL, NULL,
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-PIKA_MAX_IMAGE_SIZE,
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PIKA_MAX_IMAGE_SIZE, 0,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_Y,
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g_param_spec_double ("y", NULL, NULL,
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-PIKA_MAX_IMAGE_SIZE,
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PIKA_MAX_IMAGE_SIZE, 0,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_WIDTH,
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g_param_spec_double ("width", NULL, NULL,
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-PIKA_MAX_IMAGE_SIZE,
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PIKA_MAX_IMAGE_SIZE, 0,
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PIKA_PARAM_READWRITE));
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g_object_class_install_property (object_class, PROP_HEIGHT,
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g_param_spec_double ("height", NULL, NULL,
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-PIKA_MAX_IMAGE_SIZE,
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PIKA_MAX_IMAGE_SIZE, 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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}
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static void
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pika_canvas_rectangle_guides_init (PikaCanvasRectangleGuides *rectangle)
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{
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}
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static void
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pika_canvas_rectangle_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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PikaCanvasRectangleGuidesPrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_X:
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private->x = g_value_get_double (value);
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break;
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case PROP_Y:
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private->y = g_value_get_double (value);
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break;
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case PROP_WIDTH:
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private->width = g_value_get_double (value);
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break;
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case PROP_HEIGHT:
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private->height = 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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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_rectangle_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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PikaCanvasRectangleGuidesPrivate *private = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_X:
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g_value_set_double (value, private->x);
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break;
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case PROP_Y:
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g_value_set_double (value, private->y);
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break;
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case PROP_WIDTH:
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g_value_set_double (value, private->width);
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break;
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case PROP_HEIGHT:
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g_value_set_double (value, private->height);
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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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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_rectangle_guides_transform (PikaCanvasItem *item,
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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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PikaCanvasRectangleGuidesPrivate *private = GET_PRIVATE (item);
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pika_canvas_item_transform_xy_f (item,
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MIN (private->x,
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private->x + private->width),
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MIN (private->y,
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private->y + private->height),
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x1, y1);
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pika_canvas_item_transform_xy_f (item,
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MAX (private->x,
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private->x + private->width),
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MAX (private->y,
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private->y + private->height),
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x2, y2);
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*x1 = floor (*x1) + 0.5;
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*y1 = floor (*y1) + 0.5;
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*x2 = ceil (*x2) - 0.5;
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*y2 = ceil (*y2) - 0.5;
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*x2 = MAX (*x1, *x2);
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*y2 = MAX (*y1, *y2);
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}
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static void
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draw_hline (cairo_t *cr,
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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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y = floor (y) + 0.5;
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cairo_move_to (cr, x1, y);
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cairo_line_to (cr, 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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gdouble y1,
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gdouble y2,
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gdouble x)
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{
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x = floor (x) + 0.5;
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cairo_move_to (cr, x, y1);
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cairo_line_to (cr, x, y2);
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}
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static void
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pika_canvas_rectangle_guides_draw (PikaCanvasItem *item,
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cairo_t *cr)
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{
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PikaCanvasRectangleGuidesPrivate *private = GET_PRIVATE (item);
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gdouble x1, y1;
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gdouble x2, y2;
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gint i;
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pika_canvas_rectangle_guides_transform (item, &x1, &y1, &x2, &y2);
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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, x1, x2, (y1 + y2) / 2);
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draw_vline (cr, y1, y2, (x1 + x2) / 2);
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break;
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case PIKA_GUIDES_THIRDS:
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draw_hline (cr, x1, x2, (2 * y1 + y2) / 3);
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draw_hline (cr, x1, x2, ( y1 + 2 * y2) / 3);
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draw_vline (cr, y1, y2, (2 * x1 + x2) / 3);
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draw_vline (cr, y1, y2, ( x1 + 2 * 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, x1, x2, y1 + i * (y2 - y1) / 5);
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draw_vline (cr, y1, y2, x1 + i * (x2 - 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, x1, x2, (2 * y1 + (1 + SQRT5) * y2) / (3 + SQRT5));
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draw_hline (cr, x1, x2, ((1 + SQRT5) * y1 + 2 * y2) / (3 + SQRT5));
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draw_vline (cr, y1, y2, (2 * x1 + (1 + SQRT5) * x2) / (3 + SQRT5));
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draw_vline (cr, y1, y2, ((1 + SQRT5) * x1 + 2 * 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 (x2 - x1, y2 - y1);
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/* diagonal from the top-left edge */
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cairo_move_to (cr, x1, y1);
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cairo_line_to (cr, x1 + square_side, y1 + square_side);
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/* diagonal from the top-right edge */
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cairo_move_to (cr, x2, y1);
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cairo_line_to (cr, x2 - square_side, y1 + square_side);
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/* diagonal from the bottom-left edge */
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cairo_move_to (cr, x1, y2);
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cairo_line_to (cr, x1 + square_side, y2 - square_side);
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/* diagonal from the bottom-right edge */
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cairo_move_to (cr, x2, y2);
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cairo_line_to (cr, x2 - square_side, 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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for (i = 0; i < private->n_guides; i++)
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{
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draw_hline (cr, x1, x2, y1 + i * (y2 - y1) / private->n_guides);
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draw_vline (cr, y1, y2, x1 + i * (x2 - x1) / private->n_guides);
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}
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break;
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case PIKA_GUIDES_SPACING:
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break;
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}
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_pika_canvas_item_stroke (item, cr);
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}
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static cairo_region_t *
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pika_canvas_rectangle_guides_get_extents (PikaCanvasItem *item)
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{
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PikaCanvasRectangleGuidesPrivate *private = GET_PRIVATE (item);
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if (private->type != PIKA_GUIDES_NONE)
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{
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cairo_rectangle_int_t rectangle;
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gdouble x1, y1;
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gdouble x2, y2;
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pika_canvas_rectangle_guides_transform (item, &x1, &y1, &x2, &y2);
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rectangle.x = floor (x1 - 1.5);
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rectangle.y = floor (y1 - 1.5);
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rectangle.width = ceil (x2 - x1 + 3.0);
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rectangle.height = ceil (y2 - y1 + 3.0);
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return cairo_region_create_rectangle (&rectangle);
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}
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return NULL;
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}
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PikaCanvasItem *
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pika_canvas_rectangle_guides_new (PikaDisplayShell *shell,
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gdouble x,
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gdouble y,
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gdouble width,
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gdouble height,
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PikaGuidesType type,
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gint n_guides)
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{
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g_return_val_if_fail (PIKA_IS_DISPLAY_SHELL (shell), NULL);
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return g_object_new (PIKA_TYPE_CANVAS_RECTANGLE_GUIDES,
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"shell", shell,
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"x", x,
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"y", y,
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"width", width,
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"height", height,
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"type", type,
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"n-guides", n_guides,
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NULL);
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}
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void
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pika_canvas_rectangle_guides_set (PikaCanvasItem *rectangle,
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gdouble x,
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gdouble y,
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gdouble width,
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gdouble height,
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PikaGuidesType type,
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gint n_guides)
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{
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g_return_if_fail (PIKA_IS_CANVAS_RECTANGLE_GUIDES (rectangle));
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pika_canvas_item_begin_change (rectangle);
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g_object_set (rectangle,
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"x", x,
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"y", y,
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"width", width,
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"height", height,
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"type", type,
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"n-guides", n_guides,
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NULL);
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pika_canvas_item_end_change (rectangle);
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}
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