cut ops can start with the mouse pointer not over a region

[ardour.git] / libs / canvas / arc.cc

diff --git a/libs/canvas/arc.cc b/libs/canvas/arc.cc
index eeecd3204ae8c3ffa952fe9af61126d56f060057..baec2fafb14f46e3758e2039cfb992975ce2c72f 100644 (file)
--- a/libs/canvas/arc.cc
+++ b/libs/canvas/arc.cc
@@ -16,8 +16,11 @@
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
 
+#include <cmath>
 #include <algorithm>
+
 #include <cairomm/context.h>
+
 #include "pbd/compose.h"
 #include "canvas/circle.h"
 #include "canvas/types.h"
@@ -28,15 +31,20 @@
 using namespace std;
 using namespace ArdourCanvas;
 
-Arc::Arc (Group* parent)
-       : Item (parent)
-       , Outline (parent)
-       , Fill (parent)
+Arc::Arc (Canvas* c)
+       : Item (c)
        , _radius (0.0)
        , _arc_degrees (0.0)
        , _start_degrees (0.0)
 {
+}
 
+Arc::Arc (Item* parent)
+       : Item (parent)
+       , _radius (0.0)
+       , _arc_degrees (0.0)
+       , _start_degrees (0.0)
+{
 }
 
 void
@@ -97,7 +105,6 @@ Arc::set_radius (Coord r)
        end_change ();
 }      
 
-
 void
 Arc::set_arc (double deg)
 {
@@ -121,3 +128,15 @@ Arc::set_start (double deg)
        end_change ();
 }      
 
+bool
+Arc::covers (Duple const & point) const
+{
+       Duple p = window_to_item (point);
+
+       double angle_degs = atan (p.y/p.x) * 2.0 * M_PI;
+       double radius = sqrt (p.x * p.x + p.y * p.y);
+       
+       return (angle_degs >= _start_degrees) && 
+               (angle_degs <= (_start_degrees + _arc_degrees)) && 
+               (radius < _radius);
+}