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-rw-r--r--app/widgets/gimppolar.c393
1 files changed, 393 insertions, 0 deletions
diff --git a/app/widgets/gimppolar.c b/app/widgets/gimppolar.c
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+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimppolar.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 "gimppolar.h"
+
+
+enum
+{
+ PROP_0,
+ PROP_ANGLE,
+ PROP_RADIUS
+};
+
+typedef enum
+{
+ POLAR_TARGET_NONE = 0,
+ POLAR_TARGET_CIRCLE = 1 << 0
+} PolarTarget;
+
+
+struct _GimpPolarPrivate
+{
+ gdouble angle;
+ gdouble radius;
+
+ PolarTarget target;
+};
+
+
+static void gimp_polar_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_polar_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+
+static gboolean gimp_polar_expose_event (GtkWidget *widget,
+ GdkEventExpose *event);
+static gboolean gimp_polar_button_press_event (GtkWidget *widget,
+ GdkEventButton *bevent);
+static gboolean gimp_polar_motion_notify_event (GtkWidget *widget,
+ GdkEventMotion *mevent);
+
+static void gimp_polar_reset_target (GimpCircle *circle);
+
+static void gimp_polar_set_target (GimpPolar *polar,
+ PolarTarget target);
+
+static void gimp_polar_draw_circle (cairo_t *cr,
+ gint size,
+ gdouble angle,
+ gdouble radius,
+ PolarTarget highlight);
+
+static gdouble gimp_polar_normalize_angle (gdouble angle);
+static gdouble gimp_polar_get_angle_distance (gdouble alpha,
+ gdouble beta);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpPolar, gimp_polar, GIMP_TYPE_CIRCLE)
+
+#define parent_class gimp_polar_parent_class
+
+
+static void
+gimp_polar_class_init (GimpPolarClass *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_polar_get_property;
+ object_class->set_property = gimp_polar_set_property;
+
+ widget_class->expose_event = gimp_polar_expose_event;
+ widget_class->button_press_event = gimp_polar_button_press_event;
+ widget_class->motion_notify_event = gimp_polar_motion_notify_event;
+
+ circle_class->reset_target = gimp_polar_reset_target;
+
+ g_object_class_install_property (object_class, PROP_ANGLE,
+ g_param_spec_double ("angle",
+ NULL, NULL,
+ 0.0, 2 * G_PI, 0.0,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+
+ g_object_class_install_property (object_class, PROP_RADIUS,
+ g_param_spec_double ("radius",
+ NULL, NULL,
+ 0.0, 1.0, 0.0,
+ GIMP_PARAM_READWRITE |
+ G_PARAM_CONSTRUCT));
+}
+
+static void
+gimp_polar_init (GimpPolar *polar)
+{
+ polar->priv = gimp_polar_get_instance_private (polar);
+}
+
+static void
+gimp_polar_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpPolar *polar = GIMP_POLAR (object);
+
+ switch (property_id)
+ {
+ case PROP_ANGLE:
+ polar->priv->angle = g_value_get_double (value);
+ gtk_widget_queue_draw (GTK_WIDGET (polar));
+ break;
+
+ case PROP_RADIUS:
+ polar->priv->radius = g_value_get_double (value);
+ gtk_widget_queue_draw (GTK_WIDGET (polar));
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_polar_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpPolar *polar = GIMP_POLAR (object);
+
+ switch (property_id)
+ {
+ case PROP_ANGLE:
+ g_value_set_double (value, polar->priv->angle);
+ break;
+
+ case PROP_RADIUS:
+ g_value_set_double (value, polar->priv->radius);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static gboolean
+gimp_polar_expose_event (GtkWidget *widget,
+ GdkEventExpose *event)
+{
+ GimpPolar *polar = GIMP_POLAR (widget);
+
+ GTK_WIDGET_CLASS (parent_class)->expose_event (widget, event);
+
+ if (gtk_widget_is_drawable (widget))
+ {
+ GtkAllocation allocation;
+ gint size;
+ cairo_t *cr;
+
+ 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);
+
+ gimp_polar_draw_circle (cr, size,
+ polar->priv->angle, polar->priv->radius,
+ polar->priv->target);
+
+ cairo_destroy (cr);
+ }
+
+ return FALSE;
+}
+
+static gboolean
+gimp_polar_button_press_event (GtkWidget *widget,
+ GdkEventButton *bevent)
+{
+ GimpPolar *polar = GIMP_POLAR (widget);
+
+ if (bevent->type == GDK_BUTTON_PRESS &&
+ bevent->button == 1 &&
+ polar->priv->target != POLAR_TARGET_NONE)
+ {
+ gdouble angle;
+ gdouble radius;
+
+ GTK_WIDGET_CLASS (parent_class)->button_press_event (widget, bevent);
+
+ angle = _gimp_circle_get_angle_and_distance (GIMP_CIRCLE (polar),
+ bevent->x, bevent->y,
+ &radius);
+ radius = MIN (radius, 1.0);
+
+ g_object_set (polar,
+ "angle", angle,
+ "radius", radius,
+ NULL);
+ }
+
+ return FALSE;
+}
+
+static gboolean
+gimp_polar_motion_notify_event (GtkWidget *widget,
+ GdkEventMotion *mevent)
+{
+ GimpPolar *polar = GIMP_POLAR (widget);
+ gdouble angle;
+ gdouble radius;
+
+ angle = _gimp_circle_get_angle_and_distance (GIMP_CIRCLE (polar),
+ mevent->x, mevent->y,
+ &radius);
+
+ if (_gimp_circle_has_grab (GIMP_CIRCLE (polar)))
+ {
+ radius = MIN (radius, 1.0);
+
+ g_object_set (polar,
+ "angle", angle,
+ "radius", radius,
+ NULL);
+ }
+ else
+ {
+ PolarTarget target;
+ gdouble dist_angle;
+ gdouble dist_radius;
+
+ dist_angle = gimp_polar_get_angle_distance (polar->priv->angle, angle);
+ dist_radius = ABS (polar->priv->radius - radius);
+
+ if ((radius < 0.2 && polar->priv->radius < 0.2) ||
+ (dist_angle < (G_PI / 12) && dist_radius < 0.2))
+ {
+ target = POLAR_TARGET_CIRCLE;
+ }
+ else
+ {
+ target = POLAR_TARGET_NONE;
+ }
+
+ gimp_polar_set_target (polar, target);
+ }
+
+ gdk_event_request_motions (mevent);
+
+ return FALSE;
+}
+
+static void
+gimp_polar_reset_target (GimpCircle *circle)
+{
+ gimp_polar_set_target (GIMP_POLAR (circle), POLAR_TARGET_NONE);
+}
+
+
+/* public functions */
+
+GtkWidget *
+gimp_polar_new (void)
+{
+ return g_object_new (GIMP_TYPE_POLAR, NULL);
+}
+
+
+/* private functions */
+
+static void
+gimp_polar_set_target (GimpPolar *polar,
+ PolarTarget target)
+{
+ if (target != polar->priv->target)
+ {
+ polar->priv->target = target;
+ gtk_widget_queue_draw (GTK_WIDGET (polar));
+ }
+}
+
+static void
+gimp_polar_draw_circle (cairo_t *cr,
+ gint size,
+ gdouble angle,
+ gdouble radius,
+ PolarTarget highlight)
+{
+ gdouble r = size / 2.0 - 2.0; /* half the broad line with and half a px */
+ gdouble x = r + r * radius * cos (angle);
+ gdouble y = r - r * radius * sin (angle);
+
+ 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);
+
+ cairo_arc (cr, x, y, 3, 0, 2 * G_PI);
+
+ if (highlight == POLAR_TARGET_NONE)
+ {
+ 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);
+ }
+ else
+ {
+ 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_polar_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_polar_get_angle_distance (gdouble alpha,
+ gdouble beta)
+{
+ return ABS (MIN (gimp_polar_normalize_angle (alpha - beta),
+ 2 * G_PI - gimp_polar_normalize_angle (alpha - beta)));
+}
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