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-rw-r--r--app/widgets/gimpdial.c596
1 files changed, 596 insertions, 0 deletions
diff --git a/app/widgets/gimpdial.c b/app/widgets/gimpdial.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpdial.c
+ * Copyright (C) 2014 Michael Natterer <mitch@gimp.org>
+ *
+ * Based on code from the color-rotate plug-in
+ * Copyright (C) 1997-1999 Sven Anders (anderss@fmi.uni-passau.de)
+ * Based on code from Pavel Grinfeld (pavel@ml.com)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+#include "config.h"
+
+#include <gegl.h>
+#include <gtk/gtk.h>
+
+#include "libgimpmath/gimpmath.h"
+#include "libgimpcolor/gimpcolor.h"
+#include "libgimpwidgets/gimpwidgets.h"
+
+#include "widgets-types.h"
+
+#include "core/gimp-cairo.h"
+
+#include "gimpdial.h"
+
+
+#define SEGMENT_FRACTION 0.3
+
+
+enum
+{
+ PROP_0,
+ PROP_DRAW_BETA,
+ PROP_ALPHA,
+ PROP_BETA,
+ PROP_CLOCKWISE_ANGLES,
+ PROP_CLOCKWISE_DELTA
+};
+
+typedef enum
+{
+ DIAL_TARGET_NONE = 0,
+ DIAL_TARGET_ALPHA = 1 << 0,
+ DIAL_TARGET_BETA = 1 << 1,
+ DIAL_TARGET_BOTH = DIAL_TARGET_ALPHA | DIAL_TARGET_BETA
+} DialTarget;
+
+
+struct _GimpDialPrivate
+{
+ gdouble alpha;
+ gdouble beta;
+ gboolean clockwise_angles;
+ gboolean clockwise_delta;
+ gboolean draw_beta;
+
+ DialTarget target;
+ gdouble last_angle;
+};
+
+
+static void gimp_dial_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_dial_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+
+static gboolean gimp_dial_expose_event (GtkWidget *widget,
+ GdkEventExpose *event);
+static gboolean gimp_dial_button_press_event (GtkWidget *widget,
+ GdkEventButton *bevent);
+static gboolean gimp_dial_motion_notify_event (GtkWidget *widget,
+ GdkEventMotion *mevent);
+
+static void gimp_dial_reset_target (GimpCircle *circle);
+
+static void gimp_dial_set_target (GimpDial *dial,
+ DialTarget target);
+
+static void gimp_dial_draw_arrows (cairo_t *cr,
+ gint size,
+ gdouble alpha,
+ gdouble beta,
+ gboolean clockwise_delta,
+ DialTarget highlight,
+ gboolean draw_beta);
+
+static gdouble gimp_dial_normalize_angle (gdouble angle);
+static gdouble gimp_dial_get_angle_distance (gdouble alpha,
+ gdouble beta);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpDial, gimp_dial, GIMP_TYPE_CIRCLE)
+
+#define parent_class gimp_dial_parent_class
+
+
+static void
+gimp_dial_class_init (GimpDialClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+ GimpCircleClass *circle_class = GIMP_CIRCLE_CLASS (klass);
+
+ object_class->get_property = gimp_dial_get_property;
+ object_class->set_property = gimp_dial_set_property;
+
+ widget_class->expose_event = gimp_dial_expose_event;
+ widget_class->button_press_event = gimp_dial_button_press_event;
+ widget_class->motion_notify_event = gimp_dial_motion_notify_event;
+
+ circle_class->reset_target = gimp_dial_reset_target;
+
+ g_object_class_install_property (object_class, PROP_ALPHA,
+ g_param_spec_double ("alpha",
+ NULL, NULL,
+ 0.0, 2 * G_PI, 0.0,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_BETA,
+ g_param_spec_double ("beta",
+ NULL, NULL,
+ 0.0, 2 * G_PI, G_PI,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_CLOCKWISE_ANGLES,
+ g_param_spec_boolean ("clockwise-angles",
+ NULL, NULL,
+ FALSE,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_CLOCKWISE_DELTA,
+ g_param_spec_boolean ("clockwise-delta",
+ NULL, NULL,
+ FALSE,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_DRAW_BETA,
+ g_param_spec_boolean ("draw-beta",
+ NULL, NULL,
+ TRUE,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_dial_init (GimpDial *dial)
+{
+ dial->priv = gimp_dial_get_instance_private (dial);
+}
+
+static void
+gimp_dial_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpDial *dial = GIMP_DIAL (object);
+
+ switch (property_id)
+ {
+ case PROP_ALPHA:
+ dial->priv->alpha = g_value_get_double (value);
+ gtk_widget_queue_draw (GTK_WIDGET (dial));
+ break;
+
+ case PROP_BETA:
+ dial->priv->beta = g_value_get_double (value);
+ gtk_widget_queue_draw (GTK_WIDGET (dial));
+ break;
+
+ case PROP_CLOCKWISE_ANGLES:
+ dial->priv->clockwise_angles = g_value_get_boolean (value);
+ gtk_widget_queue_draw (GTK_WIDGET (dial));
+ break;
+
+ case PROP_CLOCKWISE_DELTA:
+ dial->priv->clockwise_delta = g_value_get_boolean (value);
+ gtk_widget_queue_draw (GTK_WIDGET (dial));
+ break;
+
+ case PROP_DRAW_BETA:
+ dial->priv->draw_beta = g_value_get_boolean (value);
+ gtk_widget_queue_draw (GTK_WIDGET (dial));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_dial_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpDial *dial = GIMP_DIAL (object);
+
+ switch (property_id)
+ {
+ case PROP_ALPHA:
+ g_value_set_double (value, dial->priv->alpha);
+ break;
+
+ case PROP_BETA:
+ g_value_set_double (value, dial->priv->beta);
+ break;
+
+ case PROP_CLOCKWISE_ANGLES:
+ g_value_set_boolean (value, dial->priv->clockwise_angles);
+ break;
+
+ case PROP_CLOCKWISE_DELTA:
+ g_value_set_boolean (value, dial->priv->clockwise_delta);
+ break;
+
+ case PROP_DRAW_BETA:
+ g_value_set_boolean (value, dial->priv->draw_beta);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static gboolean
+gimp_dial_expose_event (GtkWidget *widget,
+ GdkEventExpose *event)
+{
+ GimpDial *dial = GIMP_DIAL (widget);
+
+ GTK_WIDGET_CLASS (parent_class)->expose_event (widget, event);
+
+ if (gtk_widget_is_drawable (widget))
+ {
+ GtkAllocation allocation;
+ gint size;
+ cairo_t *cr;
+ gdouble alpha = dial->priv->alpha;
+ gdouble beta = dial->priv->beta;
+
+ g_object_get (widget,
+ "size", &size,
+ NULL);
+
+ cr = gdk_cairo_create (event->window);
+ gdk_cairo_region (cr, event->region);
+ cairo_clip (cr);
+
+ gtk_widget_get_allocation (widget, &allocation);
+
+ cairo_translate (cr,
+ (gdouble) allocation.x + (allocation.width - size) / 2.0,
+ (gdouble) allocation.y + (allocation.height - size) / 2.0);
+
+ if (dial->priv->clockwise_angles)
+ {
+ alpha = -alpha;
+ beta = -beta;
+ }
+
+ gimp_dial_draw_arrows (cr, size,
+ alpha, beta,
+ dial->priv->clockwise_delta,
+ dial->priv->target,
+ dial->priv->draw_beta);
+
+ cairo_destroy (cr);
+ }
+
+ return FALSE;
+}
+
+static gboolean
+gimp_dial_button_press_event (GtkWidget *widget,
+ GdkEventButton *bevent)
+{
+ GimpDial *dial = GIMP_DIAL (widget);
+
+ if (bevent->type == GDK_BUTTON_PRESS &&
+ bevent->button == 1 &&
+ dial->priv->target != DIAL_TARGET_NONE)
+ {
+ gdouble angle;
+
+ GTK_WIDGET_CLASS (parent_class)->button_press_event (widget, bevent);
+
+ angle = _gimp_circle_get_angle_and_distance (GIMP_CIRCLE (dial),
+ bevent->x, bevent->y,
+ NULL);
+
+ if (dial->priv->clockwise_angles && angle)
+ angle = 2.0 * G_PI - angle;
+
+ dial->priv->last_angle = angle;
+
+ switch (dial->priv->target)
+ {
+ case DIAL_TARGET_ALPHA:
+ g_object_set (dial, "alpha", angle, NULL);
+ break;
+
+ case DIAL_TARGET_BETA:
+ g_object_set (dial, "beta", angle, NULL);
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ return FALSE;
+}
+
+static gboolean
+gimp_dial_motion_notify_event (GtkWidget *widget,
+ GdkEventMotion *mevent)
+{
+ GimpDial *dial = GIMP_DIAL (widget);
+ gdouble angle;
+ gdouble distance;
+
+ angle = _gimp_circle_get_angle_and_distance (GIMP_CIRCLE (dial),
+ mevent->x, mevent->y,
+ &distance);
+
+ if (dial->priv->clockwise_angles && angle)
+ angle = 2.0 * G_PI - angle;
+
+ if (_gimp_circle_has_grab (GIMP_CIRCLE (dial)))
+ {
+ gdouble delta;
+
+ delta = angle - dial->priv->last_angle;
+ dial->priv->last_angle = angle;
+
+ if (delta != 0.0)
+ {
+ switch (dial->priv->target)
+ {
+ case DIAL_TARGET_ALPHA:
+ g_object_set (dial, "alpha", angle, NULL);
+ break;
+
+ case DIAL_TARGET_BETA:
+ g_object_set (dial, "beta", angle, NULL);
+ break;
+
+ case DIAL_TARGET_BOTH:
+ g_object_set (dial,
+ "alpha", gimp_dial_normalize_angle (dial->priv->alpha + delta),
+ "beta", gimp_dial_normalize_angle (dial->priv->beta + delta),
+ NULL);
+ break;
+
+ default:
+ break;
+ }
+ }
+ }
+ else
+ {
+ DialTarget target;
+ gdouble dist_alpha;
+ gdouble dist_beta;
+
+ dist_alpha = gimp_dial_get_angle_distance (dial->priv->alpha, angle);
+ dist_beta = gimp_dial_get_angle_distance (dial->priv->beta, angle);
+
+ if (dial->priv->draw_beta &&
+ distance > SEGMENT_FRACTION &&
+ MIN (dist_alpha, dist_beta) < G_PI / 12)
+ {
+ if (dist_alpha < dist_beta)
+ {
+ target = DIAL_TARGET_ALPHA;
+ }
+ else
+ {
+ target = DIAL_TARGET_BETA;
+ }
+ }
+ else
+ {
+ target = DIAL_TARGET_BOTH;
+ }
+
+ gimp_dial_set_target (dial, target);
+ }
+
+ gdk_event_request_motions (mevent);
+
+ return FALSE;
+}
+
+static void
+gimp_dial_reset_target (GimpCircle *circle)
+{
+ gimp_dial_set_target (GIMP_DIAL (circle), DIAL_TARGET_NONE);
+}
+
+
+/* public functions */
+
+GtkWidget *
+gimp_dial_new (void)
+{
+ return g_object_new (GIMP_TYPE_DIAL, NULL);
+}
+
+
+/* private functions */
+
+static void
+gimp_dial_set_target (GimpDial *dial,
+ DialTarget target)
+{
+ if (target != dial->priv->target)
+ {
+ dial->priv->target = target;
+ gtk_widget_queue_draw (GTK_WIDGET (dial));
+ }
+}
+
+static void
+gimp_dial_draw_arrow (cairo_t *cr,
+ gdouble radius,
+ gdouble angle)
+{
+#define REL 0.8
+#define DEL 0.1
+
+ cairo_move_to (cr, radius, radius);
+ cairo_line_to (cr,
+ radius + radius * cos (angle),
+ radius - radius * sin (angle));
+
+ cairo_move_to (cr,
+ radius + radius * cos (angle),
+ radius - radius * sin (angle));
+ cairo_line_to (cr,
+ radius + radius * REL * cos (angle - DEL),
+ radius - radius * REL * sin (angle - DEL));
+
+ cairo_move_to (cr,
+ radius + radius * cos (angle),
+ radius - radius * sin (angle));
+ cairo_line_to (cr,
+ radius + radius * REL * cos (angle + DEL),
+ radius - radius * REL * sin (angle + DEL));
+}
+
+static void
+gimp_dial_draw_segment (cairo_t *cr,
+ gdouble radius,
+ gdouble alpha,
+ gdouble beta,
+ gboolean clockwise_delta)
+{
+ gint direction = clockwise_delta ? -1 : 1;
+ gint segment_dist;
+ gint tick;
+ gdouble slice;
+
+ segment_dist = radius * SEGMENT_FRACTION;
+ tick = MIN (10, segment_dist);
+
+ cairo_move_to (cr,
+ radius + segment_dist * cos (beta),
+ radius - segment_dist * sin (beta));
+ cairo_line_to (cr,
+ radius + segment_dist * cos (beta) +
+ direction * tick * sin (beta),
+ radius - segment_dist * sin (beta) +
+ direction * tick * cos (beta));
+
+ cairo_new_sub_path (cr);
+
+ if (clockwise_delta)
+ slice = -gimp_dial_normalize_angle (alpha - beta);
+ else
+ slice = gimp_dial_normalize_angle (beta - alpha);
+
+ gimp_cairo_arc (cr, radius, radius, segment_dist,
+ alpha, slice);
+}
+
+static void
+gimp_dial_draw_arrows (cairo_t *cr,
+ gint size,
+ gdouble alpha,
+ gdouble beta,
+ gboolean clockwise_delta,
+ DialTarget highlight,
+ gboolean draw_beta)
+{
+ gdouble radius = size / 2.0 - 2.0; /* half the broad line with and half a px */
+
+ cairo_save (cr);
+
+ cairo_translate (cr, 2.0, 2.0); /* half the broad line width and half a px*/
+
+ cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
+ cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
+
+ if (highlight != DIAL_TARGET_BOTH)
+ {
+ if (! (highlight & DIAL_TARGET_ALPHA))
+ gimp_dial_draw_arrow (cr, radius, alpha);
+
+ if (draw_beta)
+ {
+ if (! (highlight & DIAL_TARGET_BETA))
+ gimp_dial_draw_arrow (cr, radius, beta);
+
+ if ((highlight & DIAL_TARGET_BOTH) != DIAL_TARGET_BOTH)
+ gimp_dial_draw_segment (cr, radius, alpha, beta, clockwise_delta);
+ }
+
+ 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)
+ gimp_dial_draw_arrow (cr, radius, alpha);
+
+ if (draw_beta)
+ {
+ if (highlight & DIAL_TARGET_BETA)
+ gimp_dial_draw_arrow (cr, radius, beta);
+
+ if ((highlight & DIAL_TARGET_BOTH) == DIAL_TARGET_BOTH)
+ gimp_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
+gimp_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
+gimp_dial_get_angle_distance (gdouble alpha,
+ gdouble beta)
+{
+ return ABS (MIN (gimp_dial_normalize_angle (alpha - beta),
+ 2 * G_PI - gimp_dial_normalize_angle (alpha - beta)));
+}