From 8678f74dc63cb5977829d25ca080841666486b8c Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Tue, 23 Oct 2018 12:47:11 +0200
Subject: [PATCH] allow to access NaviCube of 3d viewer

---
 src/Gui/CommandView.cpp          |  7 +++-
 src/Gui/NaviCube.h               |  2 +-
 src/Gui/View3DInventorViewer.cpp | 61 ++++++++++++++++++++++++--------
 src/Gui/View3DInventorViewer.h   |  1 +
 4 files changed, 54 insertions(+), 17 deletions(-)

diff --git a/src/Gui/CommandView.cpp b/src/Gui/CommandView.cpp
index 856bd24072..dc168b9984 100644
--- a/src/Gui/CommandView.cpp
+++ b/src/Gui/CommandView.cpp
@@ -2003,7 +2003,12 @@ protected:
     {
         Gui::View3DInventor* view = qobject_cast<View3DInventor*>(Gui::getMainWindow()->activeWindow());
         if (view) {
-            SoGroup* group = static_cast<SoGroup*>(view->getViewer()->getSceneGraph());
+            Gui::View3DInventorViewer* viewer = view->getViewer();
+            if (!viewer)
+                return false; // no active viewer
+            SoGroup* group = dynamic_cast<SoGroup*>(viewer->getSceneGraph());
+            if (!group)
+                return false; // empty scene graph
             bool hasaxis = group->findChild(axisGroup) != -1;
             if (_pcAction->isChecked() != hasaxis)
                 _pcAction->setChecked(hasaxis);
diff --git a/src/Gui/NaviCube.h b/src/Gui/NaviCube.h
index 3af12fc0f1..3f75c1b1b0 100644
--- a/src/Gui/NaviCube.h
+++ b/src/Gui/NaviCube.h
@@ -33,7 +33,7 @@ class View3DInventorViewer;
 
 class NaviCubeImplementation;
 
-class NaviCube {
+class GuiExport NaviCube {
 public:
 	enum Corner {
 		TopLeftCorner,
diff --git a/src/Gui/View3DInventorViewer.cpp b/src/Gui/View3DInventorViewer.cpp
index 04d0e716df..f55e49e1a9 100644
--- a/src/Gui/View3DInventorViewer.cpp
+++ b/src/Gui/View3DInventorViewer.cpp
@@ -85,6 +85,8 @@
 # include <QMimeData>
 #endif
 
+#include <QVariantAnimation>
+
 #include <sstream>
 #include <Base/Console.h>
 #include <Base/Stream.h>
@@ -876,6 +878,11 @@ void View3DInventorViewer::setNaviCubeCorner(int c)
         naviCube->setCorner(static_cast<NaviCube::Corner>(c));
 }
 
+NaviCube* View3DInventorViewer::getNavigationCube() const
+{
+    return naviCube;
+}
+
 void View3DInventorViewer::setAxisCross(bool on)
 {
     SoNode* scene = getSceneGraph();
@@ -2158,28 +2165,52 @@ void View3DInventorViewer::setCameraType(SoType t)
     }
 }
 
+namespace Gui {
+    class CameraAnimation : public QVariantAnimation
+    {
+        SoCamera* camera;
+        SbRotation startRot, endRot;
+        SbVec3f startPos, endPos;
+
+    public:
+        CameraAnimation(SoCamera* camera, const SbRotation& rot, const SbVec3f& pos)
+            : camera(camera), endRot(rot), endPos(pos)
+        {
+            startPos = camera->position.getValue();
+            startRot = camera->orientation.getValue();
+        }
+        virtual ~CameraAnimation()
+        {
+        }
+    protected:
+        void updateCurrentValue(const QVariant & value)
+        {
+            int steps = endValue().toInt();
+            int curr = value.toInt();
+
+            float s = static_cast<float>(curr)/static_cast<float>(steps);
+            SbVec3f curpos = startPos * (1.0f-s) + endPos * s;
+            SbRotation currot = SbRotation::slerp(startRot, endRot, s);
+            camera->orientation.setValue(currot);
+            camera->position.setValue(curpos);
+        }
+    };
+}
+
 void View3DInventorViewer::moveCameraTo(const SbRotation& rot, const SbVec3f& pos, int steps, int ms)
 {
     SoCamera* cam = this->getSoRenderManager()->getCamera();
     if (cam == 0) return;
 
-    SbVec3f campos = cam->position.getValue();
-    SbRotation camrot = cam->orientation.getValue();
+    CameraAnimation anim(cam, rot, pos);
+    anim.setDuration(Base::clamp<int>(ms,0,5000));
+    anim.setStartValue(static_cast<int>(0));
+    anim.setEndValue(steps);
 
     QEventLoop loop;
-    QTimer timer;
-    timer.setSingleShot(true);
-    QObject::connect(&timer, SIGNAL(timeout()), &loop, SLOT(quit()));
-
-    for (int i=0; i<steps; i++) {
-        float s = float(i)/float(steps);
-        SbVec3f curpos = campos * (1.0f-s) + pos * s;
-        SbRotation currot = SbRotation::slerp(camrot, rot, s);
-        cam->orientation.setValue(currot);
-        cam->position.setValue(curpos);
-        timer.start(Base::clamp<int>(ms,0,5000));
-        loop.exec(QEventLoop::ExcludeUserInputEvents);
-    }
+    QObject::connect(&anim, SIGNAL(finished()), &loop, SLOT(quit()));
+    anim.start();
+    loop.exec(QEventLoop::ExcludeUserInputEvents);
 
     cam->orientation.setValue(rot);
     cam->position.setValue(pos);
diff --git a/src/Gui/View3DInventorViewer.h b/src/Gui/View3DInventorViewer.h
index c8809e83fc..278ec84c27 100644
--- a/src/Gui/View3DInventorViewer.h
+++ b/src/Gui/View3DInventorViewer.h
@@ -349,6 +349,7 @@ public:
     void setEnabledNaviCube(bool b);
     bool isEnabledNaviCube(void) const;
     void setNaviCubeCorner(int);
+    NaviCube* getNavigationCube() const;
     void setEnabledVBO(bool b);
     bool isEnabledVBO() const;