From 907e7cd4af129f60d74ecda38601fa306007e365 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Thu, 18 Apr 2013 21:29:13 -0400
Subject: [PATCH] part two of ... add Canvas::Arc and derive Canvas::Circle
 from it

---
 libs/canvas/canvas/circle.h | 23 ++-----------
 libs/canvas/circle.cc       | 65 ++-----------------------------------
 libs/canvas/wscript         |  1 +
 3 files changed, 5 insertions(+), 84 deletions(-)

diff --git a/libs/canvas/canvas/circle.h b/libs/canvas/canvas/circle.h
index 4cf775db0b..030e73312c 100644
--- a/libs/canvas/canvas/circle.h
+++ b/libs/canvas/canvas/circle.h
@@ -19,33 +19,14 @@
 #ifndef __CANVAS_CIRCLE_H__
 #define __CANVAS_CIRCLE_H__
 
-#include "canvas/item.h"
-#include "canvas/outline.h"
-#include "canvas/fill.h"
+#include "canvas/arc.h"
 
 namespace ArdourCanvas {
 
-class Circle : virtual public Item, public Outline, public Fill
+class Circle : public Arc
 {
 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;
 };
 	
 }
diff --git a/libs/canvas/circle.cc b/libs/canvas/circle.cc
index 3a3d6e8e7e..15a1679f74 100644
--- a/libs/canvas/circle.cc
+++ b/libs/canvas/circle.cc
@@ -16,75 +16,14 @@
     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)
+	, Arc (parent)
 {
-
+	set_arc (360.0);
 }
 
-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 ();
-}	
-
diff --git a/libs/canvas/wscript b/libs/canvas/wscript
index ba75162eae..11049f7e80 100644
--- a/libs/canvas/wscript
+++ b/libs/canvas/wscript
@@ -28,6 +28,7 @@ out = 'build'
 path_prefix = 'libs/canvas/'
 
 canvas_sources = [
+        'arc.cc',
 	'arrow.cc',
 	'canvas.cc',
         'circle.cc',