609 lines
18 KiB
C
609 lines
18 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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* pikadial.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 "core/pika-cairo.h"
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#include "pikadial.h"
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#define SEGMENT_FRACTION 0.3
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/* round n to the nearest multiple of m */
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#define SNAP(n, m) (RINT((n) / (m)) * (m))
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enum
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{
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PROP_0,
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PROP_DRAW_BETA,
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PROP_ALPHA,
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PROP_BETA,
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PROP_CLOCKWISE_ANGLES,
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PROP_CLOCKWISE_DELTA
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};
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typedef enum
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{
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DIAL_TARGET_NONE = 0,
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DIAL_TARGET_ALPHA = 1 << 0,
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DIAL_TARGET_BETA = 1 << 1,
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DIAL_TARGET_BOTH = DIAL_TARGET_ALPHA | DIAL_TARGET_BETA
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} DialTarget;
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struct _PikaDialPrivate
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{
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gdouble alpha;
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gdouble beta;
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gboolean clockwise_angles;
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gboolean clockwise_delta;
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gboolean draw_beta;
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DialTarget target;
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gdouble last_angle;
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};
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static void pika_dial_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_dial_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 gboolean pika_dial_draw (GtkWidget *widget,
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cairo_t *cr);
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static gboolean pika_dial_button_press_event (GtkWidget *widget,
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GdkEventButton *bevent);
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static gboolean pika_dial_motion_notify_event (GtkWidget *widget,
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GdkEventMotion *mevent);
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static void pika_dial_reset_target (PikaCircle *circle);
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static void pika_dial_set_target (PikaDial *dial,
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DialTarget target);
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static void pika_dial_draw_arrows (cairo_t *cr,
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gint size,
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gdouble alpha,
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gdouble beta,
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gboolean clockwise_delta,
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DialTarget highlight,
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gboolean draw_beta);
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static gdouble pika_dial_normalize_angle (gdouble angle);
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static gdouble pika_dial_get_angle_distance (gdouble alpha,
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gdouble beta);
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G_DEFINE_TYPE_WITH_PRIVATE (PikaDial, pika_dial, PIKA_TYPE_CIRCLE)
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#define parent_class pika_dial_parent_class
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static void
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pika_dial_class_init (PikaDialClass *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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PikaCircleClass *circle_class = PIKA_CIRCLE_CLASS (klass);
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object_class->get_property = pika_dial_get_property;
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object_class->set_property = pika_dial_set_property;
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widget_class->draw = pika_dial_draw;
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widget_class->button_press_event = pika_dial_button_press_event;
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widget_class->motion_notify_event = pika_dial_motion_notify_event;
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circle_class->reset_target = pika_dial_reset_target;
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g_object_class_install_property (object_class, PROP_ALPHA,
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g_param_spec_double ("alpha",
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NULL, NULL,
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0.0, 2 * G_PI, 0.0,
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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_BETA,
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g_param_spec_double ("beta",
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NULL, NULL,
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0.0, 2 * G_PI, G_PI,
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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_CLOCKWISE_ANGLES,
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g_param_spec_boolean ("clockwise-angles",
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NULL, NULL,
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FALSE,
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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_CLOCKWISE_DELTA,
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g_param_spec_boolean ("clockwise-delta",
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NULL, NULL,
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FALSE,
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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_DRAW_BETA,
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g_param_spec_boolean ("draw-beta",
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NULL, NULL,
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TRUE,
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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_dial_init (PikaDial *dial)
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{
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dial->priv = pika_dial_get_instance_private (dial);
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}
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static void
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pika_dial_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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PikaDial *dial = PIKA_DIAL (object);
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switch (property_id)
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{
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case PROP_ALPHA:
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dial->priv->alpha = g_value_get_double (value);
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gtk_widget_queue_draw (GTK_WIDGET (dial));
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break;
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case PROP_BETA:
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dial->priv->beta = g_value_get_double (value);
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gtk_widget_queue_draw (GTK_WIDGET (dial));
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break;
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case PROP_CLOCKWISE_ANGLES:
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dial->priv->clockwise_angles = g_value_get_boolean (value);
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gtk_widget_queue_draw (GTK_WIDGET (dial));
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break;
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case PROP_CLOCKWISE_DELTA:
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dial->priv->clockwise_delta = g_value_get_boolean (value);
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gtk_widget_queue_draw (GTK_WIDGET (dial));
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break;
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case PROP_DRAW_BETA:
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dial->priv->draw_beta = g_value_get_boolean (value);
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gtk_widget_queue_draw (GTK_WIDGET (dial));
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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_dial_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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PikaDial *dial = PIKA_DIAL (object);
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switch (property_id)
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{
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case PROP_ALPHA:
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g_value_set_double (value, dial->priv->alpha);
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break;
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case PROP_BETA:
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g_value_set_double (value, dial->priv->beta);
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break;
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case PROP_CLOCKWISE_ANGLES:
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g_value_set_boolean (value, dial->priv->clockwise_angles);
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break;
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case PROP_CLOCKWISE_DELTA:
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g_value_set_boolean (value, dial->priv->clockwise_delta);
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break;
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case PROP_DRAW_BETA:
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g_value_set_boolean (value, dial->priv->draw_beta);
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break;
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default:
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G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
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break;
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}
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}
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static gboolean
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pika_dial_draw (GtkWidget *widget,
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cairo_t *cr)
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{
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PikaDial *dial = PIKA_DIAL (widget);
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GtkAllocation allocation;
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gint size;
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gdouble alpha = dial->priv->alpha;
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gdouble beta = dial->priv->beta;
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GTK_WIDGET_CLASS (parent_class)->draw (widget, cr);
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g_object_get (widget,
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"size", &size,
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NULL);
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gtk_widget_get_allocation (widget, &allocation);
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if (dial->priv->clockwise_angles)
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{
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alpha = -alpha;
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beta = -beta;
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}
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cairo_save (cr);
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cairo_translate (cr,
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(allocation.width - size) / 2.0,
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(allocation.height - size) / 2.0);
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pika_dial_draw_arrows (cr, size,
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alpha, beta,
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dial->priv->clockwise_delta,
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dial->priv->target,
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dial->priv->draw_beta);
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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_dial_button_press_event (GtkWidget *widget,
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GdkEventButton *bevent)
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{
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PikaDial *dial = PIKA_DIAL (widget);
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if (bevent->type == GDK_BUTTON_PRESS &&
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bevent->button == 1 &&
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dial->priv->target != DIAL_TARGET_NONE)
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{
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gdouble angle;
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GTK_WIDGET_CLASS (parent_class)->button_press_event (widget, bevent);
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angle = _pika_circle_get_angle_and_distance (PIKA_CIRCLE (dial),
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bevent->x, bevent->y,
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NULL);
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if (dial->priv->clockwise_angles && angle)
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angle = 2.0 * G_PI - angle;
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if (bevent->state & GDK_SHIFT_MASK)
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angle = SNAP (angle, G_PI / 12.0);
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dial->priv->last_angle = angle;
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switch (dial->priv->target)
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{
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case DIAL_TARGET_ALPHA:
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g_object_set (dial, "alpha", angle, NULL);
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break;
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case DIAL_TARGET_BETA:
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g_object_set (dial, "beta", angle, NULL);
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break;
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default:
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break;
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}
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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_dial_motion_notify_event (GtkWidget *widget,
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GdkEventMotion *mevent)
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{
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PikaDial *dial = PIKA_DIAL (widget);
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gdouble angle;
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gdouble distance;
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angle = _pika_circle_get_angle_and_distance (PIKA_CIRCLE (dial),
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mevent->x, mevent->y,
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&distance);
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if (dial->priv->clockwise_angles && angle)
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angle = 2.0 * G_PI - angle;
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if (_pika_circle_has_grab (PIKA_CIRCLE (dial)))
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{
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gdouble delta;
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if (mevent->state & GDK_SHIFT_MASK)
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angle = SNAP (angle, G_PI / 12.0);
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delta = angle - dial->priv->last_angle;
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dial->priv->last_angle = angle;
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if (delta != 0.0)
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{
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gdouble alpha = dial->priv->alpha;
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switch (dial->priv->target)
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{
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case DIAL_TARGET_ALPHA:
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g_object_set (dial, "alpha", angle, NULL);
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break;
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case DIAL_TARGET_BETA:
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g_object_set (dial, "beta", angle, NULL);
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break;
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case DIAL_TARGET_BOTH:
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/* snap both by the alpha value */
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if (mevent->state & GDK_SHIFT_MASK)
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delta = SNAP (alpha + delta, G_PI / 12.0) - alpha;
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g_object_set (dial,
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"alpha", pika_dial_normalize_angle (dial->priv->alpha + delta),
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"beta", pika_dial_normalize_angle (dial->priv->beta + delta),
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NULL);
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break;
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default:
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break;
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}
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}
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}
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else
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{
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DialTarget target;
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gdouble dist_alpha;
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gdouble dist_beta;
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dist_alpha = pika_dial_get_angle_distance (dial->priv->alpha, angle);
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dist_beta = pika_dial_get_angle_distance (dial->priv->beta, angle);
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if (dial->priv->draw_beta &&
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distance > SEGMENT_FRACTION &&
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MIN (dist_alpha, dist_beta) < G_PI / 12)
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{
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if (dist_alpha < dist_beta)
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{
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target = DIAL_TARGET_ALPHA;
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}
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else
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{
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target = DIAL_TARGET_BETA;
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}
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}
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else
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{
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target = DIAL_TARGET_BOTH;
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}
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pika_dial_set_target (dial, target);
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}
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gdk_event_request_motions (mevent);
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return FALSE;
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}
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static void
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pika_dial_reset_target (PikaCircle *circle)
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{
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pika_dial_set_target (PIKA_DIAL (circle), DIAL_TARGET_NONE);
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}
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/* public functions */
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GtkWidget *
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pika_dial_new (void)
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{
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return g_object_new (PIKA_TYPE_DIAL, NULL);
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}
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/* private functions */
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static void
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pika_dial_set_target (PikaDial *dial,
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DialTarget target)
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{
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if (target != dial->priv->target)
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{
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dial->priv->target = target;
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gtk_widget_queue_draw (GTK_WIDGET (dial));
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}
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}
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static void
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pika_dial_draw_arrow (cairo_t *cr,
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gdouble radius,
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gdouble angle)
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{
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#define REL 0.8
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#define DEL 0.1
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cairo_move_to (cr, radius, radius);
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cairo_line_to (cr,
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radius + radius * cos (angle),
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radius - radius * sin (angle));
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cairo_move_to (cr,
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radius + radius * cos (angle),
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radius - radius * sin (angle));
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cairo_line_to (cr,
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radius + radius * REL * cos (angle - DEL),
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radius - radius * REL * sin (angle - DEL));
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cairo_move_to (cr,
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radius + radius * cos (angle),
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radius - radius * sin (angle));
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cairo_line_to (cr,
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radius + radius * REL * cos (angle + DEL),
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radius - radius * REL * sin (angle + DEL));
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}
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static void
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pika_dial_draw_segment (cairo_t *cr,
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gdouble radius,
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gdouble alpha,
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gdouble beta,
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gboolean clockwise_delta)
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{
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gint direction = clockwise_delta ? -1 : 1;
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gint segment_dist;
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gint tick;
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gdouble slice;
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segment_dist = radius * SEGMENT_FRACTION;
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tick = MIN (10, segment_dist);
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cairo_move_to (cr,
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radius + segment_dist * cos (beta),
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radius - segment_dist * sin (beta));
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cairo_line_to (cr,
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radius + segment_dist * cos (beta) +
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direction * tick * sin (beta),
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radius - segment_dist * sin (beta) +
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direction * tick * cos (beta));
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cairo_new_sub_path (cr);
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if (clockwise_delta)
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slice = -pika_dial_normalize_angle (alpha - beta);
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else
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slice = pika_dial_normalize_angle (beta - alpha);
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pika_cairo_arc (cr, radius, radius, segment_dist,
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alpha, slice);
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}
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static void
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pika_dial_draw_arrows (cairo_t *cr,
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gint size,
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gdouble alpha,
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gdouble beta,
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gboolean clockwise_delta,
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DialTarget highlight,
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gboolean draw_beta)
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{
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gdouble radius = size / 2.0 - 2.0; /* half the broad line with and half a px */
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cairo_save (cr);
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cairo_translate (cr, 2.0, 2.0); /* half the broad line width and half a px*/
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cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
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cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
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if (highlight != DIAL_TARGET_BOTH)
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{
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if (! (highlight & DIAL_TARGET_ALPHA))
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pika_dial_draw_arrow (cr, radius, alpha);
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if (draw_beta)
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{
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if (! (highlight & DIAL_TARGET_BETA))
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pika_dial_draw_arrow (cr, radius, beta);
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if ((highlight & DIAL_TARGET_BOTH) != DIAL_TARGET_BOTH)
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pika_dial_draw_segment (cr, radius, alpha, beta, clockwise_delta);
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}
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cairo_set_line_width (cr, 3.0);
|
|
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);
|
|
}
|
|
|
|
if (highlight != DIAL_TARGET_NONE)
|
|
{
|
|
if (highlight & DIAL_TARGET_ALPHA)
|
|
pika_dial_draw_arrow (cr, radius, alpha);
|
|
|
|
if (draw_beta)
|
|
{
|
|
if (highlight & DIAL_TARGET_BETA)
|
|
pika_dial_draw_arrow (cr, radius, beta);
|
|
|
|
if ((highlight & DIAL_TARGET_BOTH) == DIAL_TARGET_BOTH)
|
|
pika_dial_draw_segment (cr, radius, alpha, beta, clockwise_delta);
|
|
}
|
|
|
|
cairo_set_line_width (cr, 3.0);
|
|
cairo_set_source_rgba (cr, 0.0, 0.0, 0.0, 0.6);
|
|
cairo_stroke_preserve (cr);
|
|
|
|
cairo_set_line_width (cr, 1.0);
|
|
cairo_set_source_rgba (cr, 1.0, 1.0, 1.0, 0.8);
|
|
cairo_stroke (cr);
|
|
}
|
|
|
|
cairo_restore (cr);
|
|
}
|
|
|
|
static gdouble
|
|
pika_dial_normalize_angle (gdouble angle)
|
|
{
|
|
if (angle < 0)
|
|
return angle + 2 * G_PI;
|
|
else if (angle > 2 * G_PI)
|
|
return angle - 2 * G_PI;
|
|
else
|
|
return angle;
|
|
}
|
|
|
|
static gdouble
|
|
pika_dial_get_angle_distance (gdouble alpha,
|
|
gdouble beta)
|
|
{
|
|
return ABS (MIN (pika_dial_normalize_angle (alpha - beta),
|
|
2 * G_PI - pika_dial_normalize_angle (alpha - beta)));
|
|
}
|
