From 86da435331fd1cfc67e0d5c9ddcbbb67b1eb8ab2 Mon Sep 17 00:00:00 2001
From: jfa <jfa@opencascade.com>
Date: Tue, 13 Feb 2007 11:47:25 +0000
Subject: [PATCH] NPAL14854: EDF 359 OCC: Zooming problem. Take into account
 direction of vertical mouse movement (like in VTK).

---
 src/OCCViewer/OCCViewer_ViewPort3d.cxx | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/OCCViewer/OCCViewer_ViewPort3d.cxx b/src/OCCViewer/OCCViewer_ViewPort3d.cxx
index 1a83b55ea..cbeb3ce9c 100755
--- a/src/OCCViewer/OCCViewer_ViewPort3d.cxx
+++ b/src/OCCViewer/OCCViewer_ViewPort3d.cxx
@@ -296,8 +296,12 @@ void OCCViewer_ViewPort3d::fitRect( const QRect& rect )
 */
 void OCCViewer_ViewPort3d::zoom( int x0, int y0, int x, int y )
 {
-	if ( !activeView().IsNull() )
-	    activeView()->Zoom( x0, y0, x, y );
+  if ( !activeView().IsNull() ) {
+    // as OCCT respects a sign of only dx,
+    // but we want both signes to be taken into account
+    //activeView()->Zoom( x0, y0, x, y );
+    activeView()->Zoom( x0 + y0, 0, x + y, 0 );
+  }
 }
 
 /*!
-- 
2.39.2