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-rw-r--r--app/display/gimpcanvasarc.c369
1 files changed, 369 insertions, 0 deletions
diff --git a/app/display/gimpcanvasarc.c b/app/display/gimpcanvasarc.c
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--- /dev/null
+++ b/app/display/gimpcanvasarc.c
@@ -0,0 +1,369 @@
+/* GIMP - The GNU Image Manipulation Program
+ * Copyright (C) 1995 Spencer Kimball and Peter Mattis
+ *
+ * gimpcanvasarc.c
+ * Copyright (C) 2010 Michael Natterer <mitch@gimp.org>
+ *
+ * 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 "libgimpbase/gimpbase.h"
+#include "libgimpmath/gimpmath.h"
+
+#include "display-types.h"
+
+#include "core/gimp-cairo.h"
+
+#include "gimpcanvasarc.h"
+#include "gimpdisplayshell.h"
+
+
+enum
+{
+ PROP_0,
+ PROP_CENTER_X,
+ PROP_CENTER_Y,
+ PROP_RADIUS_X,
+ PROP_RADIUS_Y,
+ PROP_START_ANGLE,
+ PROP_SLICE_ANGLE,
+ PROP_FILLED
+};
+
+
+typedef struct _GimpCanvasArcPrivate GimpCanvasArcPrivate;
+
+struct _GimpCanvasArcPrivate
+{
+ gdouble center_x;
+ gdouble center_y;
+ gdouble radius_x;
+ gdouble radius_y;
+ gdouble start_angle;
+ gdouble slice_angle;
+ gboolean filled;
+};
+
+#define GET_PRIVATE(arc) \
+ ((GimpCanvasArcPrivate *) gimp_canvas_arc_get_instance_private ((GimpCanvasArc *) (arc)))
+
+
+/* local function prototypes */
+
+static void gimp_canvas_arc_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec);
+static void gimp_canvas_arc_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec);
+static void gimp_canvas_arc_draw (GimpCanvasItem *item,
+ cairo_t *cr);
+static cairo_region_t * gimp_canvas_arc_get_extents (GimpCanvasItem *item);
+
+
+G_DEFINE_TYPE_WITH_PRIVATE (GimpCanvasArc, gimp_canvas_arc,
+ GIMP_TYPE_CANVAS_ITEM)
+
+#define parent_class gimp_canvas_arc_parent_class
+
+
+static void
+gimp_canvas_arc_class_init (GimpCanvasArcClass *klass)
+{
+ GObjectClass *object_class = G_OBJECT_CLASS (klass);
+ GimpCanvasItemClass *item_class = GIMP_CANVAS_ITEM_CLASS (klass);
+
+ object_class->set_property = gimp_canvas_arc_set_property;
+ object_class->get_property = gimp_canvas_arc_get_property;
+
+ item_class->draw = gimp_canvas_arc_draw;
+ item_class->get_extents = gimp_canvas_arc_get_extents;
+
+ g_object_class_install_property (object_class, PROP_CENTER_X,
+ g_param_spec_double ("center-x", NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE, 0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_CENTER_Y,
+ g_param_spec_double ("center-y", NULL, NULL,
+ -GIMP_MAX_IMAGE_SIZE,
+ GIMP_MAX_IMAGE_SIZE, 0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_RADIUS_X,
+ g_param_spec_double ("radius-x", NULL, NULL,
+ 0, GIMP_MAX_IMAGE_SIZE, 0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_RADIUS_Y,
+ g_param_spec_double ("radius-y", NULL, NULL,
+ 0, GIMP_MAX_IMAGE_SIZE, 0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_START_ANGLE,
+ g_param_spec_double ("start-angle", NULL, NULL,
+ -1000, 1000, 0,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_SLICE_ANGLE,
+ g_param_spec_double ("slice-angle", NULL, NULL,
+ -1000, 1000, 2 * G_PI,
+ GIMP_PARAM_READWRITE));
+
+ g_object_class_install_property (object_class, PROP_FILLED,
+ g_param_spec_boolean ("filled", NULL, NULL,
+ FALSE,
+ GIMP_PARAM_READWRITE));
+}
+
+static void
+gimp_canvas_arc_init (GimpCanvasArc *arc)
+{
+}
+
+static void
+gimp_canvas_arc_set_property (GObject *object,
+ guint property_id,
+ const GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvasArcPrivate *private = GET_PRIVATE (object);
+
+ switch (property_id)
+ {
+ case PROP_CENTER_X:
+ private->center_x = g_value_get_double (value);
+ break;
+ case PROP_CENTER_Y:
+ private->center_y = g_value_get_double (value);
+ break;
+ case PROP_RADIUS_X:
+ private->radius_x = g_value_get_double (value);
+ break;
+ case PROP_RADIUS_Y:
+ private->radius_y = g_value_get_double (value);
+ break;
+ case PROP_START_ANGLE:
+ private->start_angle = g_value_get_double (value);
+ break;
+ case PROP_SLICE_ANGLE:
+ private->slice_angle = g_value_get_double (value);
+ break;
+ case PROP_FILLED:
+ private->filled = g_value_get_boolean (value);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_canvas_arc_get_property (GObject *object,
+ guint property_id,
+ GValue *value,
+ GParamSpec *pspec)
+{
+ GimpCanvasArcPrivate *private = GET_PRIVATE (object);
+
+ switch (property_id)
+ {
+ case PROP_CENTER_X:
+ g_value_set_double (value, private->center_x);
+ break;
+ case PROP_CENTER_Y:
+ g_value_set_double (value, private->center_y);
+ break;
+ case PROP_RADIUS_X:
+ g_value_set_double (value, private->radius_x);
+ break;
+ case PROP_RADIUS_Y:
+ g_value_set_double (value, private->radius_y);
+ break;
+ case PROP_START_ANGLE:
+ g_value_set_double (value, private->start_angle);
+ break;
+ case PROP_SLICE_ANGLE:
+ g_value_set_double (value, private->slice_angle);
+ break;
+ case PROP_FILLED:
+ g_value_set_boolean (value, private->filled);
+ break;
+
+ default:
+ G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
+ break;
+ }
+}
+
+static void
+gimp_canvas_arc_transform (GimpCanvasItem *item,
+ gdouble *center_x,
+ gdouble *center_y,
+ gdouble *radius_x,
+ gdouble *radius_y)
+{
+ GimpCanvasArcPrivate *private = GET_PRIVATE (item);
+ gdouble x1, y1;
+ gdouble x2, y2;
+
+ gimp_canvas_item_transform_xy_f (item,
+ private->center_x - private->radius_x,
+ private->center_y - private->radius_y,
+ &x1, &y1);
+ gimp_canvas_item_transform_xy_f (item,
+ private->center_x + private->radius_x,
+ private->center_y + private->radius_y,
+ &x2, &y2);
+
+ x1 = floor (x1);
+ y1 = floor (y1);
+ x2 = ceil (x2);
+ y2 = ceil (y2);
+
+ *center_x = (x1 + x2) / 2.0;
+ *center_y = (y1 + y2) / 2.0;
+
+ *radius_x = (x2 - x1) / 2.0;
+ *radius_y = (y2 - y1) / 2.0;
+
+ if (! private->filled)
+ {
+ *radius_x = MAX (*radius_x - 0.5, 0.0);
+ *radius_y = MAX (*radius_y - 0.5, 0.0);
+ }
+
+ /* avoid cairo_scale (cr, 0.0, 0.0) */
+ if (*radius_x == 0.0) *radius_x = 0.000001;
+ if (*radius_y == 0.0) *radius_y = 0.000001;
+}
+
+static void
+gimp_canvas_arc_draw (GimpCanvasItem *item,
+ cairo_t *cr)
+{
+ GimpCanvasArcPrivate *private = GET_PRIVATE (item);
+ gdouble center_x, center_y;
+ gdouble radius_x, radius_y;
+
+ gimp_canvas_arc_transform (item,
+ &center_x, &center_y,
+ &radius_x, &radius_y);
+
+ cairo_save (cr);
+ cairo_translate (cr, center_x, center_y);
+ cairo_scale (cr, radius_x, radius_y);
+ gimp_cairo_arc (cr, 0.0, 0.0, 1.0,
+ private->start_angle, private->slice_angle);
+ cairo_restore (cr);
+
+ if (private->filled)
+ _gimp_canvas_item_fill (item, cr);
+ else
+ _gimp_canvas_item_stroke (item, cr);
+}
+
+static cairo_region_t *
+gimp_canvas_arc_get_extents (GimpCanvasItem *item)
+{
+ GimpCanvasArcPrivate *private = GET_PRIVATE (item);
+ cairo_region_t *region;
+ cairo_rectangle_int_t rectangle;
+ gdouble center_x, center_y;
+ gdouble radius_x, radius_y;
+
+ gimp_canvas_arc_transform (item,
+ &center_x, &center_y,
+ &radius_x, &radius_y);
+
+ rectangle.x = floor (center_x - radius_x - 1.5);
+ rectangle.y = floor (center_y - radius_y - 1.5);
+ rectangle.width = ceil (center_x + radius_x + 1.5) - rectangle.x;
+ rectangle.height = ceil (center_y + radius_y + 1.5) - rectangle.y;
+
+ region = cairo_region_create_rectangle (&rectangle);
+
+ if (! private->filled &&
+ rectangle.width > 64 * 1.43 &&
+ rectangle.height > 64 * 1.43)
+ {
+ radius_x *= 0.7;
+ radius_y *= 0.7;
+
+ rectangle.x = ceil (center_x - radius_x + 1.5);
+ rectangle.y = ceil (center_y - radius_y + 1.5);
+ rectangle.width = floor (center_x + radius_x - 1.5) - rectangle.x;
+ rectangle.height = floor (center_y + radius_y - 1.5) - rectangle.y;
+
+ cairo_region_subtract_rectangle (region, &rectangle);
+ }
+
+ return region;
+}
+
+GimpCanvasItem *
+gimp_canvas_arc_new (GimpDisplayShell *shell,
+ gdouble center_x,
+ gdouble center_y,
+ gdouble radius_x,
+ gdouble radius_y,
+ gdouble start_angle,
+ gdouble slice_angle,
+ gboolean filled)
+{
+ g_return_val_if_fail (GIMP_IS_DISPLAY_SHELL (shell), NULL);
+
+ return g_object_new (GIMP_TYPE_CANVAS_ARC,
+ "shell", shell,
+ "center-x", center_x,
+ "center-y", center_y,
+ "radius-x", radius_x,
+ "radius-y", radius_y,
+ "start-angle", start_angle,
+ "slice-angle", slice_angle,
+ "filled", filled,
+ NULL);
+}
+
+void
+gimp_canvas_arc_set (GimpCanvasItem *arc,
+ gdouble center_x,
+ gdouble center_y,
+ gdouble radius_x,
+ gdouble radius_y,
+ gdouble start_angle,
+ gdouble slice_angle)
+{
+ g_return_if_fail (GIMP_IS_CANVAS_ARC (arc));
+
+ gimp_canvas_item_begin_change (arc);
+ g_object_set (arc,
+ "center-x", center_x,
+ "center-y", center_y,
+ "radius-x", radius_x,
+ "radius-y", radius_y,
+ "start-angle", start_angle,
+ "slice-angle", slice_angle,
+ NULL);
+ gimp_canvas_item_end_change (arc);
+}
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