765 lines
20 KiB
C
765 lines
20 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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* pikacanvaslimit.c
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* Copyright (C) 2020 Ell
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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-cairo.h"
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#include "pikacanvaslimit.h"
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#include "pikadisplayshell.h"
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#define DASH_LENGTH 4.0
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#define HIT_DISTANCE 16.0
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enum
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{
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PROP_0,
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PROP_TYPE,
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PROP_X,
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PROP_Y,
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PROP_RADIUS,
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PROP_ASPECT_RATIO,
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PROP_ANGLE,
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PROP_DASHED
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};
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typedef struct _PikaCanvasLimitPrivate PikaCanvasLimitPrivate;
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struct _PikaCanvasLimitPrivate
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{
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PikaLimitType type;
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gdouble x;
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gdouble y;
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gdouble radius;
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gdouble aspect_ratio;
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gdouble angle;
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gboolean dashed;
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};
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#define GET_PRIVATE(limit) \
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((PikaCanvasLimitPrivate *) pika_canvas_limit_get_instance_private ((PikaCanvasLimit *) (limit)))
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/* local function prototypes */
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static void pika_canvas_limit_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_limit_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_limit_draw (PikaCanvasItem *item,
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cairo_t *cr);
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static cairo_region_t * pika_canvas_limit_get_extents (PikaCanvasItem *item);
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static gboolean pika_canvas_limit_hit (PikaCanvasItem *item,
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gdouble x,
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gdouble y);
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G_DEFINE_TYPE_WITH_PRIVATE (PikaCanvasLimit, pika_canvas_limit,
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PIKA_TYPE_CANVAS_ITEM)
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#define parent_class pika_canvas_limit_parent_class
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/* private functions */
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static void
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pika_canvas_limit_class_init (PikaCanvasLimitClass *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_limit_set_property;
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object_class->get_property = pika_canvas_limit_get_property;
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item_class->draw = pika_canvas_limit_draw;
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item_class->get_extents = pika_canvas_limit_get_extents;
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item_class->hit = pika_canvas_limit_hit;
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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_LIMIT_TYPE,
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PIKA_LIMIT_CIRCLE,
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PIKA_PARAM_READWRITE));
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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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-G_MAXDOUBLE,
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+G_MAXDOUBLE,
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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_Y,
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g_param_spec_double ("y", NULL, NULL,
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-G_MAXDOUBLE,
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+G_MAXDOUBLE,
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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_RADIUS,
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g_param_spec_double ("radius", NULL, NULL,
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0.0,
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+G_MAXDOUBLE,
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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_ASPECT_RATIO,
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g_param_spec_double ("aspect-ratio", NULL, NULL,
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-1.0,
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+1.0,
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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_ANGLE,
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g_param_spec_double ("angle", NULL, NULL,
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-G_MAXDOUBLE,
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+G_MAXDOUBLE,
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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_DASHED,
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g_param_spec_boolean ("dashed", 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_limit_init (PikaCanvasLimit *limit)
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{
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}
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static void
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pika_canvas_limit_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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PikaCanvasLimitPrivate *priv = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_TYPE:
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priv->type = g_value_get_enum (value);
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break;
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case PROP_X:
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priv->x = g_value_get_double (value);
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break;
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case PROP_Y:
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priv->y = g_value_get_double (value);
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break;
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case PROP_RADIUS:
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priv->radius = g_value_get_double (value);
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break;
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case PROP_ASPECT_RATIO:
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priv->aspect_ratio = g_value_get_double (value);
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break;
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case PROP_ANGLE:
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priv->angle = g_value_get_double (value);
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break;
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case PROP_DASHED:
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priv->dashed = 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_limit_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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PikaCanvasLimitPrivate *priv = GET_PRIVATE (object);
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switch (property_id)
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{
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case PROP_TYPE:
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g_value_set_enum (value, priv->type);
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break;
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case PROP_X:
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g_value_set_double (value, priv->x);
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break;
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case PROP_Y:
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g_value_set_double (value, priv->y);
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break;
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case PROP_RADIUS:
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g_value_set_double (value, priv->radius);
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break;
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case PROP_ASPECT_RATIO:
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g_value_set_double (value, priv->aspect_ratio);
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break;
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case PROP_ANGLE:
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g_value_set_double (value, priv->angle);
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break;
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case PROP_DASHED:
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g_value_set_boolean (value, priv->dashed);
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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_limit_transform (PikaCanvasItem *item,
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gdouble *x,
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gdouble *y,
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gdouble *rx,
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gdouble *ry)
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{
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PikaCanvasLimit *limit = PIKA_CANVAS_LIMIT (item);
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PikaCanvasLimitPrivate *priv = GET_PRIVATE (item);
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gdouble x1, y1;
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gdouble x2, y2;
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gdouble min_radius = 0.0;
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pika_canvas_limit_get_radii (limit, rx, ry);
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pika_canvas_item_transform_xy_f (item,
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priv->x - *rx, priv->y - *ry,
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&x1, &y1);
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pika_canvas_item_transform_xy_f (item,
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priv->x + *rx, priv->y + *ry,
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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 = floor (x2) + 0.5;
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y2 = floor (y2) + 0.5;
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*x = (x1 + x2) / 2.0;
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*y = (y1 + y2) / 2.0;
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*rx = (x2 - x1) / 2.0;
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*ry = (y2 - y1) / 2.0;
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switch (priv->type)
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{
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case PIKA_LIMIT_CIRCLE:
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case PIKA_LIMIT_SQUARE:
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min_radius = 2.0;
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break;
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case PIKA_LIMIT_DIAMOND:
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min_radius = 3.0;
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break;
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case PIKA_LIMIT_HORIZONTAL:
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case PIKA_LIMIT_VERTICAL:
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min_radius = 1.0;
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break;
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}
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*rx = MAX (*rx, min_radius);
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*ry = MAX (*ry, min_radius);
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}
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static void
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pika_canvas_limit_paint (PikaCanvasItem *item,
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cairo_t *cr)
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{
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PikaCanvasLimitPrivate *priv = GET_PRIVATE (item);
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PikaDisplayShell *shell = pika_canvas_item_get_shell (item);
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gdouble x, y;
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gdouble rx, ry;
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gdouble inf;
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pika_canvas_limit_transform (item,
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&x, &y,
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&rx, &ry);
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cairo_save (cr);
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cairo_translate (cr, x, y);
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cairo_rotate (cr, priv->angle);
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cairo_scale (cr, rx, ry);
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inf = MAX (x, shell->disp_width - x) +
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MAX (y, shell->disp_height - y);
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switch (priv->type)
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{
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case PIKA_LIMIT_CIRCLE:
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cairo_arc (cr, 0.0, 0.0, 1.0, 0.0, 2.0 * G_PI);
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break;
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case PIKA_LIMIT_SQUARE:
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cairo_rectangle (cr, -1.0, -1.0, 2.0, 2.0);
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break;
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case PIKA_LIMIT_DIAMOND:
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cairo_move_to (cr, 0.0, -1.0);
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cairo_line_to (cr, +1.0, 0.0);
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cairo_line_to (cr, 0.0, +1.0);
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cairo_line_to (cr, -1.0, 0.0);
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cairo_close_path (cr);
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break;
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case PIKA_LIMIT_HORIZONTAL:
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cairo_move_to (cr, -inf / rx, -1.0);
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cairo_line_to (cr, +inf / rx, -1.0);
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cairo_move_to (cr, -inf / rx, +1.0);
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cairo_line_to (cr, +inf / rx, +1.0);
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break;
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case PIKA_LIMIT_VERTICAL:
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cairo_move_to (cr, -1.0, -inf / ry);
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cairo_line_to (cr, -1.0, +inf / ry);
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cairo_move_to (cr, +1.0, -inf / ry);
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cairo_line_to (cr, +1.0, +inf / ry);
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break;
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}
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cairo_restore (cr);
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}
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static void
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pika_canvas_limit_draw (PikaCanvasItem *item,
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cairo_t *cr)
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{
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PikaCanvasLimitPrivate *priv = GET_PRIVATE (item);
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pika_canvas_limit_paint (item, cr);
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cairo_save (cr);
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if (priv->dashed)
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cairo_set_dash (cr, (const gdouble[]) {DASH_LENGTH}, 1, 0.0);
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_pika_canvas_item_stroke (item, cr);
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cairo_restore (cr);
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}
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static cairo_region_t *
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pika_canvas_limit_get_extents (PikaCanvasItem *item)
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{
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cairo_t *cr;
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cairo_surface_t *surface;
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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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surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 1, 1);
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cr = cairo_create (surface);
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pika_canvas_limit_paint (item, cr);
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cairo_path_extents (cr,
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&x1, &y1,
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&x2, &y2);
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cairo_destroy (cr);
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cairo_surface_destroy (surface);
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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 + 1.5) - rectangle.x;
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rectangle.height = ceil (y2 + 1.5) - rectangle.y;
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return cairo_region_create_rectangle (&rectangle);
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}
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static gboolean
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pika_canvas_limit_hit (PikaCanvasItem *item,
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gdouble x,
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gdouble y)
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{
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PikaCanvasLimit *limit = PIKA_CANVAS_LIMIT (item);
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gdouble bx, by;
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pika_canvas_limit_boundary_point (limit,
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x, y,
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&bx, &by);
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return pika_canvas_item_transform_distance (item,
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x, y,
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bx, by) <= HIT_DISTANCE;
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}
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/* public functions */
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PikaCanvasItem *
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pika_canvas_limit_new (PikaDisplayShell *shell,
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PikaLimitType type,
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gdouble x,
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gdouble y,
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gdouble radius,
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gdouble aspect_ratio,
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gdouble angle,
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gboolean dashed)
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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_LIMIT,
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"shell", shell,
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"type", type,
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"x", x,
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"y", y,
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"radius", radius,
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"aspect-ratio", aspect_ratio,
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"angle", angle,
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"dashed", dashed,
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NULL);
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}
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void
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pika_canvas_limit_get_radii (PikaCanvasLimit *limit,
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gdouble *rx,
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gdouble *ry)
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{
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PikaCanvasLimitPrivate *priv;
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g_return_if_fail (PIKA_IS_CANVAS_LIMIT (limit));
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priv = GET_PRIVATE (limit);
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if (priv->aspect_ratio >= 0.0)
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{
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if (rx) *rx = priv->radius;
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if (ry) *ry = priv->radius * (1.0 - priv->aspect_ratio);
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}
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else
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{
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if (rx) *rx = priv->radius * (1.0 + priv->aspect_ratio);
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if (ry) *ry = priv->radius;
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}
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}
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gboolean
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pika_canvas_limit_is_inside (PikaCanvasLimit *limit,
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gdouble x,
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gdouble y)
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{
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PikaCanvasLimitPrivate *priv;
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PikaVector2 p;
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gdouble rx, ry;
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g_return_val_if_fail (PIKA_IS_CANVAS_LIMIT (limit), FALSE);
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priv = GET_PRIVATE (limit);
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pika_canvas_limit_get_radii (limit, &rx, &ry);
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if (rx == 0.0 || ry == 0.0)
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return FALSE;
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p.x = x - priv->x;
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p.y = y - priv->y;
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pika_vector2_rotate (&p, +priv->angle);
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p.x = fabs (p.x / rx);
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p.y = fabs (p.y / ry);
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switch (priv->type)
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{
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case PIKA_LIMIT_CIRCLE:
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return pika_vector2_length (&p) < 1.0;
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case PIKA_LIMIT_SQUARE:
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return p.x < 1.0 && p.y < 1.0;
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case PIKA_LIMIT_DIAMOND:
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return p.x + p.y < 1.0;
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case PIKA_LIMIT_HORIZONTAL:
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return p.y < 1.0;
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case PIKA_LIMIT_VERTICAL:
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return p.x < 1.0;
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}
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g_return_val_if_reached (FALSE);
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}
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void
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pika_canvas_limit_boundary_point (PikaCanvasLimit *limit,
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gdouble x,
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gdouble y,
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gdouble *bx,
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gdouble *by)
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{
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PikaCanvasLimitPrivate *priv;
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PikaVector2 p;
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gdouble rx, ry;
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gboolean flip_x = FALSE;
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gboolean flip_y = FALSE;
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g_return_if_fail (PIKA_IS_CANVAS_LIMIT (limit));
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g_return_if_fail (bx != NULL);
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g_return_if_fail (by != NULL);
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priv = GET_PRIVATE (limit);
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pika_canvas_limit_get_radii (limit, &rx, &ry);
|
|
|
|
p.x = x - priv->x;
|
|
p.y = y - priv->y;
|
|
|
|
pika_vector2_rotate (&p, +priv->angle);
|
|
|
|
if (p.x < 0.0)
|
|
{
|
|
p.x = -p.x;
|
|
|
|
flip_x = TRUE;
|
|
}
|
|
|
|
if (p.y < 0.0)
|
|
{
|
|
p.y = -p.y;
|
|
|
|
flip_y = TRUE;
|
|
}
|
|
|
|
switch (priv->type)
|
|
{
|
|
case PIKA_LIMIT_CIRCLE:
|
|
if (rx == ry)
|
|
{
|
|
pika_vector2_normalize (&p);
|
|
|
|
pika_vector2_mul (&p, rx);
|
|
}
|
|
else
|
|
{
|
|
gdouble a0 = 0.0;
|
|
gdouble a1 = G_PI / 2.0;
|
|
gdouble a;
|
|
gint i;
|
|
|
|
for (i = 0; i < 20; i++)
|
|
{
|
|
PikaVector2 r;
|
|
PikaVector2 n;
|
|
|
|
a = (a0 + a1) / 2.0;
|
|
|
|
r.x = p.x - rx * cos (a);
|
|
r.y = p.y - ry * sin (a);
|
|
|
|
n.x = 1.0;
|
|
n.y = tan (a) * rx / ry;
|
|
|
|
if (pika_vector2_cross_product (&r, &n).x >= 0.0)
|
|
a1 = a;
|
|
else
|
|
a0 = a;
|
|
}
|
|
|
|
a = (a0 + a1) / 2.0;
|
|
|
|
p.x = rx * cos (a);
|
|
p.y = ry * sin (a);
|
|
}
|
|
break;
|
|
|
|
case PIKA_LIMIT_SQUARE:
|
|
if (p.x <= rx || p.y <= ry)
|
|
{
|
|
if (rx - p.x <= ry - p.y)
|
|
p.x = rx;
|
|
else
|
|
p.y = ry;
|
|
}
|
|
else
|
|
{
|
|
p.x = rx;
|
|
p.y = ry;
|
|
}
|
|
break;
|
|
|
|
case PIKA_LIMIT_DIAMOND:
|
|
{
|
|
PikaVector2 l;
|
|
PikaVector2 r;
|
|
gdouble t;
|
|
|
|
l.x = rx;
|
|
l.y = -ry;
|
|
|
|
r.x = p.x;
|
|
r.y = p.y - ry;
|
|
|
|
t = pika_vector2_inner_product (&r, &l) /
|
|
pika_vector2_inner_product (&l, &l);
|
|
t = CLAMP (t, 0.0, 1.0);
|
|
|
|
p.x = rx * t;
|
|
p.y = ry * (1.0 - t);
|
|
}
|
|
break;
|
|
|
|
case PIKA_LIMIT_HORIZONTAL:
|
|
p.y = ry;
|
|
break;
|
|
|
|
case PIKA_LIMIT_VERTICAL:
|
|
p.x = rx;
|
|
break;
|
|
}
|
|
|
|
if (flip_x)
|
|
p.x = -p.x;
|
|
|
|
if (flip_y)
|
|
p.y = -p.y;
|
|
|
|
pika_vector2_rotate (&p, -priv->angle);
|
|
|
|
*bx = priv->x + p.x;
|
|
*by = priv->y + p.y;
|
|
}
|
|
|
|
gdouble
|
|
pika_canvas_limit_boundary_radius (PikaCanvasLimit *limit,
|
|
gdouble x,
|
|
gdouble y)
|
|
{
|
|
PikaCanvasLimitPrivate *priv;
|
|
PikaVector2 p;
|
|
|
|
g_return_val_if_fail (PIKA_IS_CANVAS_LIMIT (limit), 0.0);
|
|
|
|
priv = GET_PRIVATE (limit);
|
|
|
|
p.x = x - priv->x;
|
|
p.y = y - priv->y;
|
|
|
|
pika_vector2_rotate (&p, +priv->angle);
|
|
|
|
p.x = fabs (p.x);
|
|
p.y = fabs (p.y);
|
|
|
|
if (priv->aspect_ratio >= 0.0)
|
|
p.y /= 1.0 - priv->aspect_ratio;
|
|
else
|
|
p.x /= 1.0 + priv->aspect_ratio;
|
|
|
|
switch (priv->type)
|
|
{
|
|
case PIKA_LIMIT_CIRCLE:
|
|
return pika_vector2_length (&p);
|
|
|
|
case PIKA_LIMIT_SQUARE:
|
|
return MAX (p.x, p.y);
|
|
|
|
case PIKA_LIMIT_DIAMOND:
|
|
return p.x + p.y;
|
|
|
|
case PIKA_LIMIT_HORIZONTAL:
|
|
return p.y;
|
|
|
|
case PIKA_LIMIT_VERTICAL:
|
|
return p.x;
|
|
}
|
|
|
|
g_return_val_if_reached (0.0);
|
|
}
|
|
|
|
void
|
|
pika_canvas_limit_center_point (PikaCanvasLimit *limit,
|
|
gdouble x,
|
|
gdouble y,
|
|
gdouble *cx,
|
|
gdouble *cy)
|
|
{
|
|
PikaCanvasLimitPrivate *priv;
|
|
PikaVector2 p;
|
|
|
|
g_return_if_fail (PIKA_IS_CANVAS_LIMIT (limit));
|
|
g_return_if_fail (cx != NULL);
|
|
g_return_if_fail (cy != NULL);
|
|
|
|
priv = GET_PRIVATE (limit);
|
|
|
|
p.x = x - priv->x;
|
|
p.y = y - priv->y;
|
|
|
|
pika_vector2_rotate (&p, +priv->angle);
|
|
|
|
switch (priv->type)
|
|
{
|
|
case PIKA_LIMIT_CIRCLE:
|
|
case PIKA_LIMIT_SQUARE:
|
|
case PIKA_LIMIT_DIAMOND:
|
|
p.x = 0.0;
|
|
p.y = 0.0;
|
|
break;
|
|
|
|
case PIKA_LIMIT_HORIZONTAL:
|
|
p.y = 0.0;
|
|
break;
|
|
|
|
case PIKA_LIMIT_VERTICAL:
|
|
p.x = 0.0;
|
|
break;
|
|
}
|
|
|
|
pika_vector2_rotate (&p, -priv->angle);
|
|
|
|
*cx = priv->x + p.x;
|
|
*cy = priv->y + p.y;
|
|
}
|
