drop use of bounding box to determine whether an item covers a point; add Item::covers(Duple const&)

Default implementation for Item still uses bounding box, but specializations for Arc (Circle), Polygon, Line and PolyLine have been added

1 files changed, 18 insertions, 0 deletions

diff --git a/libs/canvas/item.cc b/libs/canvas/item.cc
index 534ae6d52e..3c3816881a 100644
--- a/libs/canvas/item.cc
+++ b/libs/canvas/item.cc
@@ -546,6 +546,24 @@ Item::depth () const
 	return d;
 }
 
+bool
+Item::covers (Duple const & point) const
+{
+	Duple p = canvas_to_item (point);
+
+	if (_bounding_box_dirty) {
+		compute_bounding_box ();
+	}
+
+	boost::optional<Rect> r = bounding_box();
+
+	if (!r) {
+		return false;
+	}
+
+	return r.get().contains (p);
+}
+
 ostream&
 ArdourCanvas::operator<< (ostream& o, const Item& i)
 {