From 03a873c877f68c2e8f95b09229aa885ce4b2f45c Mon Sep 17 00:00:00 2001
From: "Zheng, Lei" <realthunder.dev@gmail.com>
Date: Sun, 10 Feb 2019 12:07:08 +0800
Subject: [PATCH] Gui: allow changing scale factor in SoAutoZoomTranslation

---
 src/Gui/Inventor/SoAutoZoomTranslation.cpp | 6 +++++-
 src/Gui/Inventor/SoAutoZoomTranslation.h   | 2 ++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/Gui/Inventor/SoAutoZoomTranslation.cpp b/src/Gui/Inventor/SoAutoZoomTranslation.cpp
index 34f7d58164ab..22b8ce8502c2 100644
--- a/src/Gui/Inventor/SoAutoZoomTranslation.cpp
+++ b/src/Gui/Inventor/SoAutoZoomTranslation.cpp
@@ -73,16 +73,20 @@ void SoAutoZoomTranslation::initClass()
 
 float SoAutoZoomTranslation::getScaleFactor(SoAction* action) const
 {
+    float scale = scaleFactor.getValue();
+    if(!scale)
+        return 1.0;
     // Dividing by 5 seems to work well
     SbViewVolume vv = SoViewVolumeElement::get(action->getState());
     float aspectRatio = SoViewportRegionElement::get(action->getState()).getViewportAspectRatio();
-    float scale = vv.getWorldToScreenScale(SbVec3f(0.f, 0.f, 0.f), 0.1f) / (5*aspectRatio);
+    scale *= vv.getWorldToScreenScale(SbVec3f(0.f, 0.f, 0.f), 0.1f) / (5*aspectRatio);
     return scale;
 }
 
 SoAutoZoomTranslation::SoAutoZoomTranslation()
 {
     SO_NODE_CONSTRUCTOR(SoAutoZoomTranslation);
+    SO_NODE_ADD_FIELD(scaleFactor, (1.0f));
     //SO_NODE_ADD_FIELD(abPos, (SbVec3f(0.f,0.f,0.f)));
 }
 
diff --git a/src/Gui/Inventor/SoAutoZoomTranslation.h b/src/Gui/Inventor/SoAutoZoomTranslation.h
index 954a75eb0816..d763a6bd867c 100644
--- a/src/Gui/Inventor/SoAutoZoomTranslation.h
+++ b/src/Gui/Inventor/SoAutoZoomTranslation.h
@@ -39,6 +39,8 @@ class GuiExport SoAutoZoomTranslation : public SoTransformation  {
     SoAutoZoomTranslation();
     //SoSFVec3f abPos;
 
+    SoSFFloat scaleFactor;
+
 protected:
     virtual ~SoAutoZoomTranslation() {};
     virtual void doAction(SoAction * action);