break down GdkEventExpose into distinct rectangles for canvas expose rather than...

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

diff --git a/libs/canvas/line.cc b/libs/canvas/line.cc
index 61acf892528a0d73c150008c400d63f2cef75c6a..09f9061c8593653b601c3d6791c7c42918f06982 100644 (file)
--- a/libs/canvas/line.cc
+++ b/libs/canvas/line.cc
@@ -60,11 +60,17 @@ Line::render (Rect const & /*area*/, Cairo::RefPtr<Cairo::Context> context) cons
        Duple p0 = item_to_window (Duple (_points[0].x, _points[0].y));
        Duple p1 = item_to_window (Duple (_points[1].x, _points[1].y));
 
-       /* See Cairo FAQ on single pixel lines to understand why we add 0.5
-        */
+       if (_outline_width <= 1.0) {
+               /* See Cairo FAQ on single pixel lines to understand why we add 0.5
+                */
+               
+               const Duple half_a_pixel (0.5, 0.5);
+               p0 = p0.translate (half_a_pixel);
+               p1 = p1.translate (half_a_pixel);
+       }
 
-       context->move_to (p0.x + 0.5, p0.y + 0.5);
-       context->line_to (p1.x + 0.5, p1.y + 0.5);
+       context->move_to (p0.x, p0.y);
+       context->line_to (p1.x, p1.y);
        context->stroke ();
 }