Gui: Add easing to navigation animations

src/Gui/NavigationAnimation.cpp

@@ -44,7 +44,7 @@ void NavigationAnimation::onStop([[maybe_unused]] bool finished)
 
 FixedTimeAnimation::FixedTimeAnimation(NavigationStyle* navigation, const SbRotation& orientation,
                                        const SbVec3f& rotationCenter, const SbVec3f& translation,
-                                       int duration)
+                                       int duration, const QEasingCurve::Type easingCurve)
     : NavigationAnimation(navigation)
     , targetOrientation(orientation)
     , targetTranslation(translation)
@@ -53,6 +53,7 @@ FixedTimeAnimation::FixedTimeAnimation(NavigationStyle* navigation, const SbRota
     setDuration(duration);
     setStartValue(0.0);
     setEndValue(duration * 1.0);
+    setEasingCurve(easingCurve);
 }
 
 void FixedTimeAnimation::initialize()

src/Gui/NavigationAnimation.h

@@ -60,7 +60,7 @@ class GuiExport FixedTimeAnimation : public NavigationAnimation
 public:
     explicit FixedTimeAnimation(NavigationStyle* navigation, const SbRotation& orientation,
                                 const SbVec3f& rotationCenter, const SbVec3f& translation,
-                                int duration);
+                                int duration, const QEasingCurve::Type easingCurve);
 
 private:
     float angularVelocity; // [rad/ms]

src/Gui/View3DInventorViewer.cpp

@@ -3409,8 +3409,12 @@ void View3DInventorViewer::startAnimation(const SbRotation& orientation,
                        ->GetInt("AnimationDuration", 500);
     }
 
+    QEasingCurve::Type easingCurve = static_cast<QEasingCurve::Type>(App::GetApplication()
+                         .GetParameterGroupByPath("User parameter:BaseApp/Preferences/View")
+                         ->GetInt("NavigationAnimationEasingCurve", QEasingCurve::Type::InOutCubic));
+
     auto animation = std::make_shared<FixedTimeAnimation>(
-        navigation, orientation, rotationCenter, translation, duration);
+        navigation, orientation, rotationCenter, translation, duration, easingCurve);
 
     navigation->startAnimating(animation, wait);
 }