603 lines
19 KiB
C
603 lines
19 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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* pikacircle.c
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* Copyright (C) 2014 Michael Natterer <mitch@gimp.org>
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*
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* Based on code from the color-rotate plug-in
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* Copyright (C) 1997-1999 Sven Anders (anderss@fmi.uni-passau.de)
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* Based on code from Pavel Grinfeld (pavel@ml.com)
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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 "libpikacolor/pikacolor.h"
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#include "libpikawidgets/pikawidgets.h"
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#include "widgets-types.h"
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#include "pikacircle.h"
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enum
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{
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PROP_0,
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PROP_SIZE,
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PROP_BORDER_WIDTH,
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PROP_BACKGROUND
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};
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struct _PikaCirclePrivate
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{
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gint size;
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gint border_width;
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PikaCircleBackground background;
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GdkWindow *event_window;
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cairo_surface_t *surface;
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gboolean has_grab;
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gboolean in_widget;
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};
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static void pika_circle_dispose (GObject *object);
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static void pika_circle_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_circle_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_circle_realize (GtkWidget *widget);
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static void pika_circle_unrealize (GtkWidget *widget);
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static void pika_circle_map (GtkWidget *widget);
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static void pika_circle_unmap (GtkWidget *widget);
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static void pika_circle_get_preferred_width (GtkWidget *widget,
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gint *minimum_width,
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gint *natural_width);
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static void pika_circle_get_preferred_height (GtkWidget *widget,
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gint *minimum_height,
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gint *natural_height);
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static void pika_circle_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation);
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static gboolean pika_circle_draw (GtkWidget *widget,
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cairo_t *cr);
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static gboolean pika_circle_button_press_event (GtkWidget *widget,
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GdkEventButton *bevent);
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static gboolean pika_circle_button_release_event (GtkWidget *widget,
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GdkEventButton *bevent);
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static gboolean pika_circle_enter_notify_event (GtkWidget *widget,
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GdkEventCrossing *event);
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static gboolean pika_circle_leave_notify_event (GtkWidget *widget,
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GdkEventCrossing *event);
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static void pika_circle_real_reset_target (PikaCircle *circle);
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static void pika_circle_background_hsv (gdouble angle,
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gdouble distance,
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guchar *rgb);
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static void pika_circle_draw_background (PikaCircle *circle,
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cairo_t *cr,
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gint size,
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PikaCircleBackground background);
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G_DEFINE_TYPE_WITH_PRIVATE (PikaCircle, pika_circle, GTK_TYPE_WIDGET)
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#define parent_class pika_circle_parent_class
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static void
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pika_circle_class_init (PikaCircleClass *klass)
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{
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GObjectClass *object_class = G_OBJECT_CLASS (klass);
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GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
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object_class->dispose = pika_circle_dispose;
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object_class->get_property = pika_circle_get_property;
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object_class->set_property = pika_circle_set_property;
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widget_class->realize = pika_circle_realize;
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widget_class->unrealize = pika_circle_unrealize;
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widget_class->map = pika_circle_map;
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widget_class->unmap = pika_circle_unmap;
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widget_class->get_preferred_width = pika_circle_get_preferred_width;
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widget_class->get_preferred_height = pika_circle_get_preferred_height;
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widget_class->size_allocate = pika_circle_size_allocate;
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widget_class->draw = pika_circle_draw;
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widget_class->button_press_event = pika_circle_button_press_event;
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widget_class->button_release_event = pika_circle_button_release_event;
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widget_class->enter_notify_event = pika_circle_enter_notify_event;
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widget_class->leave_notify_event = pika_circle_leave_notify_event;
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klass->reset_target = pika_circle_real_reset_target;
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g_object_class_install_property (object_class, PROP_SIZE,
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g_param_spec_int ("size",
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NULL, NULL,
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32, 1024, 96,
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PIKA_PARAM_READWRITE |
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G_PARAM_CONSTRUCT));
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g_object_class_install_property (object_class, PROP_BORDER_WIDTH,
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g_param_spec_int ("border-width",
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NULL, NULL,
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0, 64, 0,
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PIKA_PARAM_READWRITE |
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G_PARAM_CONSTRUCT));
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g_object_class_install_property (object_class, PROP_BACKGROUND,
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g_param_spec_enum ("background",
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NULL, NULL,
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PIKA_TYPE_CIRCLE_BACKGROUND,
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PIKA_CIRCLE_BACKGROUND_HSV,
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PIKA_PARAM_READWRITE |
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G_PARAM_CONSTRUCT));
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}
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static void
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pika_circle_init (PikaCircle *circle)
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{
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circle->priv = pika_circle_get_instance_private (circle);
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gtk_widget_set_has_window (GTK_WIDGET (circle), FALSE);
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gtk_widget_add_events (GTK_WIDGET (circle),
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GDK_POINTER_MOTION_MASK |
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GDK_BUTTON_PRESS_MASK |
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GDK_BUTTON_RELEASE_MASK |
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GDK_BUTTON1_MOTION_MASK |
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GDK_ENTER_NOTIFY_MASK |
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GDK_LEAVE_NOTIFY_MASK);
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}
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static void
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pika_circle_dispose (GObject *object)
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{
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PikaCircle *circle = PIKA_CIRCLE (object);
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g_clear_pointer (&circle->priv->surface, cairo_surface_destroy);
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G_OBJECT_CLASS (parent_class)->dispose (object);
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}
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static void
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pika_circle_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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PikaCircle *circle = PIKA_CIRCLE (object);
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switch (property_id)
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{
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case PROP_SIZE:
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circle->priv->size = g_value_get_int (value);
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gtk_widget_queue_resize (GTK_WIDGET (circle));
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break;
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case PROP_BORDER_WIDTH:
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circle->priv->border_width = g_value_get_int (value);
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gtk_widget_queue_resize (GTK_WIDGET (circle));
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break;
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case PROP_BACKGROUND:
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circle->priv->background = g_value_get_enum (value);
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g_clear_pointer (&circle->priv->surface, cairo_surface_destroy);
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gtk_widget_queue_draw (GTK_WIDGET (circle));
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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_circle_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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PikaCircle *circle = PIKA_CIRCLE (object);
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switch (property_id)
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{
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case PROP_SIZE:
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g_value_set_int (value, circle->priv->size);
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break;
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case PROP_BORDER_WIDTH:
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g_value_set_int (value, circle->priv->border_width);
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break;
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case PROP_BACKGROUND:
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g_value_set_enum (value, circle->priv->background);
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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_circle_realize (GtkWidget *widget)
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{
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PikaCircle *circle = PIKA_CIRCLE (widget);
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GtkAllocation allocation;
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GdkWindowAttr attributes;
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gint attributes_mask;
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GTK_WIDGET_CLASS (parent_class)->realize (widget);
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gtk_widget_get_allocation (widget, &allocation);
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attributes.window_type = GDK_WINDOW_CHILD;
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attributes.x = allocation.x;
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attributes.y = allocation.y;
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attributes.width = allocation.width;
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attributes.height = allocation.height;
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attributes.wclass = GDK_INPUT_ONLY;
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attributes.event_mask = gtk_widget_get_events (widget);
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attributes_mask = GDK_WA_X | GDK_WA_Y;
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circle->priv->event_window = gdk_window_new (gtk_widget_get_window (widget),
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&attributes, attributes_mask);
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gdk_window_set_user_data (circle->priv->event_window, circle);
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}
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static void
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pika_circle_unrealize (GtkWidget *widget)
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{
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PikaCircle *circle = PIKA_CIRCLE (widget);
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if (circle->priv->event_window)
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{
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gdk_window_set_user_data (circle->priv->event_window, NULL);
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gdk_window_destroy (circle->priv->event_window);
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circle->priv->event_window = NULL;
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}
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GTK_WIDGET_CLASS (parent_class)->unrealize (widget);
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}
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static void
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pika_circle_map (GtkWidget *widget)
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{
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PikaCircle *circle = PIKA_CIRCLE (widget);
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GTK_WIDGET_CLASS (parent_class)->map (widget);
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if (circle->priv->event_window)
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gdk_window_show (circle->priv->event_window);
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}
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static void
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pika_circle_unmap (GtkWidget *widget)
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{
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PikaCircle *circle = PIKA_CIRCLE (widget);
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if (circle->priv->has_grab)
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{
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gtk_grab_remove (widget);
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circle->priv->has_grab = FALSE;
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}
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if (circle->priv->event_window)
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gdk_window_hide (circle->priv->event_window);
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GTK_WIDGET_CLASS (parent_class)->unmap (widget);
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}
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static void
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pika_circle_get_preferred_width (GtkWidget *widget,
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gint *minimum_width,
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gint *natural_width)
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{
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PikaCircle *circle = PIKA_CIRCLE (widget);
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*minimum_width = *natural_width = 2 * circle->priv->border_width + circle->priv->size;
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}
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static void
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pika_circle_get_preferred_height (GtkWidget *widget,
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gint *minimum_height,
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gint *natural_height)
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{
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PikaCircle *circle = PIKA_CIRCLE (widget);
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*minimum_height = *natural_height = 2 * circle->priv->border_width + circle->priv->size;
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}
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static void
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pika_circle_size_allocate (GtkWidget *widget,
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GtkAllocation *allocation)
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{
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PikaCircle *circle = PIKA_CIRCLE (widget);
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GTK_WIDGET_CLASS (parent_class)->size_allocate (widget, allocation);
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if (gtk_widget_get_realized (widget))
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gdk_window_move_resize (circle->priv->event_window,
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allocation->x,
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allocation->y,
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allocation->width,
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allocation->height);
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g_clear_pointer (&circle->priv->surface, cairo_surface_destroy);
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}
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static gboolean
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pika_circle_draw (GtkWidget *widget,
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cairo_t *cr)
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{
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PikaCircle *circle = PIKA_CIRCLE (widget);
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GtkAllocation allocation;
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gint size = circle->priv->size;
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gtk_widget_get_allocation (widget, &allocation);
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cairo_save (cr);
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cairo_translate (cr,
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(allocation.width - size) / 2,
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(allocation.height - size) / 2);
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pika_circle_draw_background (circle, cr, size, circle->priv->background);
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cairo_restore (cr);
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return FALSE;
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}
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static gboolean
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pika_circle_button_press_event (GtkWidget *widget,
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GdkEventButton *bevent)
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{
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PikaCircle *circle = PIKA_CIRCLE (widget);
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if (bevent->type == GDK_BUTTON_PRESS &&
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bevent->button == 1)
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{
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gtk_grab_add (widget);
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circle->priv->has_grab = TRUE;
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}
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return FALSE;
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}
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static gboolean
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pika_circle_button_release_event (GtkWidget *widget,
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GdkEventButton *bevent)
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{
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PikaCircle *circle = PIKA_CIRCLE (widget);
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if (bevent->button == 1)
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{
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gtk_grab_remove (widget);
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circle->priv->has_grab = FALSE;
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if (! circle->priv->in_widget)
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PIKA_CIRCLE_GET_CLASS (circle)->reset_target (circle);
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}
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return FALSE;
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}
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static gboolean
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pika_circle_enter_notify_event (GtkWidget *widget,
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GdkEventCrossing *event)
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{
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PikaCircle *circle = PIKA_CIRCLE (widget);
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circle->priv->in_widget = TRUE;
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return FALSE;
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}
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static gboolean
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pika_circle_leave_notify_event (GtkWidget *widget,
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GdkEventCrossing *event)
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{
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PikaCircle *circle = PIKA_CIRCLE (widget);
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circle->priv->in_widget = FALSE;
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if (! circle->priv->has_grab)
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PIKA_CIRCLE_GET_CLASS (circle)->reset_target (circle);
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return FALSE;
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}
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static void
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pika_circle_real_reset_target (PikaCircle *circle)
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{
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}
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/* public functions */
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GtkWidget *
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pika_circle_new (void)
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{
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return g_object_new (PIKA_TYPE_CIRCLE, NULL);
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}
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/* protected functions */
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static gdouble
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get_angle_and_distance (gdouble center_x,
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gdouble center_y,
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gdouble radius,
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gdouble x,
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gdouble y,
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gdouble *distance)
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{
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gdouble angle = atan2 (center_y - y,
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x - center_x);
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if (angle < 0)
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angle += 2 * G_PI;
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if (distance)
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*distance = sqrt ((SQR (x - center_x) +
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SQR (y - center_y)) / SQR (radius));
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return angle;
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}
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gboolean
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_pika_circle_has_grab (PikaCircle *circle)
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{
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g_return_val_if_fail (PIKA_IS_CIRCLE (circle), FALSE);
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return circle->priv->has_grab;
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}
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gdouble
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_pika_circle_get_angle_and_distance (PikaCircle *circle,
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gdouble event_x,
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gdouble event_y,
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gdouble *distance)
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{
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GtkAllocation allocation;
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gdouble center_x;
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gdouble center_y;
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g_return_val_if_fail (PIKA_IS_CIRCLE (circle), 0.0);
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gtk_widget_get_allocation (GTK_WIDGET (circle), &allocation);
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center_x = allocation.width / 2.0;
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center_y = allocation.height / 2.0;
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return get_angle_and_distance (center_x, center_y, circle->priv->size / 2.0,
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event_x, event_y,
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distance);
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}
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/* private functions */
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static void
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pika_circle_background_hsv (gdouble angle,
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gdouble distance,
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guchar *rgb)
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{
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PikaHSV hsv;
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PikaRGB color;
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pika_hsv_set (&hsv,
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angle / (2.0 * G_PI),
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distance,
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1 - sqrt (distance) / 4 /* it just looks nicer this way */);
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pika_hsv_to_rgb (&hsv, &color);
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pika_rgb_get_uchar (&color, rgb, rgb + 1, rgb + 2);
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}
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static void
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pika_circle_draw_background (PikaCircle *circle,
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cairo_t *cr,
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gint size,
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PikaCircleBackground background)
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{
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cairo_save (cr);
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if (background == PIKA_CIRCLE_BACKGROUND_PLAIN)
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{
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cairo_arc (cr, size / 2.0, size / 2.0, size / 2.0 - 1.5, 0.0, 2 * G_PI);
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cairo_set_line_width (cr, 3.0);
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cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.6);
|
|
cairo_stroke_preserve (cr);
|
|
|
|
cairo_set_line_width (cr, 1.0);
|
|
cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.8);
|
|
cairo_stroke (cr);
|
|
}
|
|
else
|
|
{
|
|
if (! circle->priv->surface)
|
|
{
|
|
guchar *data;
|
|
gint stride;
|
|
gint x, y;
|
|
|
|
circle->priv->surface = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
|
|
size, size);
|
|
|
|
data = cairo_image_surface_get_data (circle->priv->surface);
|
|
stride = cairo_image_surface_get_stride (circle->priv->surface);
|
|
|
|
for (y = 0; y < size; y++)
|
|
{
|
|
for (x = 0; x < size; x++)
|
|
{
|
|
gdouble angle;
|
|
gdouble distance;
|
|
guchar rgb[3] = { 0, };
|
|
|
|
angle = get_angle_and_distance (size / 2.0, size / 2.0,
|
|
size / 2.0,
|
|
x, y,
|
|
&distance);
|
|
|
|
switch (background)
|
|
{
|
|
case PIKA_CIRCLE_BACKGROUND_HSV:
|
|
pika_circle_background_hsv (angle, distance, rgb);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
|
|
PIKA_CAIRO_ARGB32_SET_PIXEL (data + y * stride + x * 4,
|
|
rgb[0], rgb[1], rgb[2], 255);
|
|
}
|
|
}
|
|
|
|
cairo_surface_mark_dirty (circle->priv->surface);
|
|
}
|
|
|
|
cairo_set_source_surface (cr, circle->priv->surface, 0.0, 0.0);
|
|
|
|
cairo_arc (cr, size / 2.0, size / 2.0, size / 2.0, 0.0, 2 * G_PI);
|
|
cairo_clip (cr);
|
|
|
|
cairo_paint (cr);
|
|
}
|
|
|
|
cairo_restore (cr);
|
|
}
|
