From 6d9539fb42c7f7806f98cfe0b767244abde95a6b Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Thu, 29 Nov 2012 14:35:42 +0100
Subject: [PATCH] 0000894: Invert mouse Zoom for CAD mouse model

---
 src/Gui/NavigationStyle.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/Gui/NavigationStyle.cpp b/src/Gui/NavigationStyle.cpp
index 85cada0b8..e801e1490 100644
--- a/src/Gui/NavigationStyle.cpp
+++ b/src/Gui/NavigationStyle.cpp
@@ -724,7 +724,10 @@ void NavigationStyle::zoomByCursor(const SbVec2f & thispos, const SbVec2f & prev
 {
     // There is no "geometrically correct" value, 20 just seems to give
     // about the right "feel".
-    zoom(viewer->getCamera(), (thispos[1] - prevpos[1]) * 10.0f/*20.0f*/);
+    float value = (thispos[1] - prevpos[1]) * 10.0f/*20.0f*/;
+    if (this->invertZoom)
+        value = -value;
+    zoom(viewer->getCamera(), value);
 }
 
 void NavigationStyle::zoomIn()