--- /dev/null
+/*
+ Copyright (C) 2013 Paul Davis
+
+ 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 2 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, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifndef __CANVAS_CIRCLE_H__
+#define __CANVAS_CIRCLE_H__
+
+#include "canvas/item.h"
+#include "canvas/outline.h"
+#include "canvas/fill.h"
+
+namespace ArdourCanvas {
+
+class Circle : virtual public Item, public Outline, public Fill
+{
+public:
+ Circle (Group *);
+
+ void render (Rect const & area, Cairo::RefPtr<Cairo::Context>) const;
+ void compute_bounding_box () const;
+
+ void set_center (Duple const &);
+ void set_radius (Coord);
+
+ Duple center() const {
+ return _center;
+ }
+ Coord radius () const {
+ return _radius;
+ }
+
+private:
+ Duple _center;
+ Coord _radius;
+};
+
+}
+
+#endif
--- /dev/null
+/*
+ Copyright (C) 2013 Paul Davis
+
+ 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 2 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, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <algorithm>
+#include <cairomm/context.h>
+#include "pbd/compose.h"
+#include "canvas/circle.h"
+#include "canvas/types.h"
+#include "canvas/debug.h"
+#include "canvas/utils.h"
+#include "canvas/canvas.h"
+
+using namespace std;
+using namespace ArdourCanvas;
+
+Circle::Circle (Group* parent)
+ : Item (parent)
+ , Outline (parent)
+ , Fill (parent)
+ , _radius (0.0)
+{
+
+}
+
+void
+Circle::compute_bounding_box () const
+{
+ Rect bbox;
+
+ bbox.x0 = _center.x - _radius;
+ bbox.y0 = _center.y - _radius;
+ bbox.x1 = _center.x + _radius;
+ bbox.y1 = _center.y + _radius;
+
+ bbox = bbox.expand (0.5 + (_outline_width / 2));
+
+ _bounding_box = bbox;
+ _bounding_box_dirty = false;
+}
+
+void
+Circle::render (Rect const & /*area*/, Cairo::RefPtr<Cairo::Context> context) const
+{
+ if (_radius <= 0.0) {
+ return;
+ }
+ context->arc (_center.x, _center.y, _radius, 0.0, 2.0 * M_PI);
+ setup_fill_context (context);
+ context->fill_preserve ();
+ setup_outline_context (context);
+ context->stroke ();
+}
+
+void
+Circle::set_center (Duple const & c)
+{
+ begin_change ();
+
+ _center = c;
+
+ _bounding_box_dirty = true;
+ end_change ();
+}
+
+void
+Circle::set_radius (Coord r)
+{
+ begin_change ();
+
+ _radius = r;
+
+ _bounding_box_dirty = true;
+ end_change ();
+}
+