From 4911ce6db010203dd1aac519ce4ee93b427b35ae Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Mon, 24 Nov 2014 13:30:58 +0200
Subject: [PATCH] correct implementation for Rectangle::vertical_fraction()

---
 libs/canvas/rectangle.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/libs/canvas/rectangle.cc b/libs/canvas/rectangle.cc
index c79416921f..7c033d447e 100644
--- a/libs/canvas/rectangle.cc
+++ b/libs/canvas/rectangle.cc
@@ -243,5 +243,8 @@ 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());
 }