3 commits

Author	SHA1	Message	Date
Paul Davis	6473cc7cb4	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	2013-11-04 11:56:10 -05:00
Paul Davis	77f5f4c4bf	basically operational switch to canvas drawing coordinates, although text and waves don't work, and redraw areas are too small	2013-06-18 08:23:06 -04:00
Paul Davis	8482ce14ce	add Canvas::Arc and derive Canvas::Circle from it	2013-04-18 21:28:11 -04:00