correct implementation for Rectangle::vertical_fraction()

2014-11-24 13:30:58 +02:00
parent 59ce8663f9
commit 38728f0835
1 changed files with 4 additions and 1 deletions
--- a/libs/canvas/rectangle.cc
+++ b/libs/canvas/rectangle.cc
@@ -284,5 +284,8 @@ Rectangle::vertical_fraction (double y) const
                return 0;
        }

-        return (i.y - bbox.y0) / bbox.height();
+        /* convert to fit Cairo origin model (origin at upper left)
+         */
+
+        return 1.0 - ((i.y - bbox.y0) / bbox.height());
 }