Add dontMoveFirstAndLast to ctkVTKScalarsToColorsView::MovePoints

It can be useful to move only the inside points of the transfer functions
instead of all the points. Add an option to do it.

Libs/Visualization/VTK/Widgets/ctkVTKScalarsToColorsView.cpp

@@ -587,24 +587,22 @@ void ctkVTKScalarsToColorsView::boundAxesToChartBounds()
 }
 
 // ----------------------------------------------------------------------------
-void ctkVTKScalarsToColorsView::moveAllPoints(double xOffset, double yOffset)
+void ctkVTKScalarsToColorsView::moveAllPoints(double xOffset, double yOffset,
+                                              bool dontMoveFirstAndLast)
 {
   vtkVector2f offset(xOffset, yOffset);
   foreach(vtkControlPointsItem* controlPointsItem, this->controlPointsItems())
     {
-    vtkSmartPointer<vtkIdTypeArray> ids;
-    ids.TakeReference(controlPointsItem->GetControlPointsIds());
-    controlPointsItem->MovePoints(offset, ids.GetPointer());
+    controlPointsItem->MovePoints(offset, dontMoveFirstAndLast);
     }
 }
 
 // ----------------------------------------------------------------------------
-void ctkVTKScalarsToColorsView::spreadAllPoints(double factor)
+void ctkVTKScalarsToColorsView::spreadAllPoints(double factor,
+                                                bool dontSpreadFirstAndLast)
 {
   foreach(vtkControlPointsItem* controlPointsItem, this->controlPointsItems())
     {
-    vtkSmartPointer<vtkIdTypeArray> ids;
-    ids.TakeReference(controlPointsItem->GetControlPointsIds());\
-    controlPointsItem->SpreadPoints(factor, ids.GetPointer());
+    controlPointsItem->SpreadPoints(factor, dontSpreadFirstAndLast);
     }
 }

Libs/Visualization/VTK/Widgets/ctkVTKScalarsToColorsView.h

@@ -98,13 +98,15 @@ public slots:
 
   /// Move all the control points by a given offset.
   /// \sa vtkControlPoints::movePoints()
-  void moveAllPoints(double xOffset, double yOffset = 0.);
+  void moveAllPoints(double xOffset, double yOffset = 0.,
+                     bool dontMoveFirstAndLast = false);
 
   /// Spread all the control points by a given offset.
   /// A value >0 will space the control points, a value <0. will contract
   /// them.
   /// \sa vtkControlPoints::spreadPoints()
-  void spreadAllPoints(double factor = 1.);
+  void spreadAllPoints(double factor = 1.,
+                       bool dontMoveFirstAndLast = false);
 
 protected slots:
   void onBoundsChanged();

Libs/Visualization/VTK/Widgets/ctkVTKVolumePropertyWidget.cpp

@@ -470,16 +470,20 @@ void ctkVTKVolumePropertyWidget::onAxesModified()
 }
 
 // ----------------------------------------------------------------------------
-void ctkVTKVolumePropertyWidget::moveAllPoints(double xOffset, double yOffset)
+void ctkVTKVolumePropertyWidget::moveAllPoints(double xOffset, double yOffset,
+                                               bool dontMoveFirstAndLast)
 {
   Q_D(ctkVTKVolumePropertyWidget);
   if (d->VolumeProperty)
     {
     d->VolumeProperty->InvokeEvent(vtkCommand::StartEvent);
     }
-  d->ScalarOpacityWidget->view()->moveAllPoints(xOffset, yOffset);
-  d->ScalarColorWidget->view()->moveAllPoints(xOffset, yOffset);
-  d->GradientWidget->view()->moveAllPoints(xOffset, yOffset);
+  d->ScalarOpacityWidget->view()
+    ->moveAllPoints(xOffset, yOffset, dontMoveFirstAndLast);
+  d->ScalarColorWidget->view()
+    ->moveAllPoints(xOffset, yOffset, dontMoveFirstAndLast);
+  d->GradientWidget->view()
+    ->moveAllPoints(xOffset, yOffset, dontMoveFirstAndLast);
   if (d->VolumeProperty)
     {
     d->VolumeProperty->InvokeEvent(vtkCommand::EndEvent);
@@ -487,12 +491,16 @@ void ctkVTKVolumePropertyWidget::moveAllPoints(double xOffset, double yOffset)
 }
 
 // ----------------------------------------------------------------------------
-void ctkVTKVolumePropertyWidget::spreadAllPoints(double factor)
+void ctkVTKVolumePropertyWidget::spreadAllPoints(double factor,
+                                                 bool dontSpreadFirstAndLast)
 {
   Q_D(ctkVTKVolumePropertyWidget);
   d->VolumeProperty->InvokeEvent(vtkCommand::StartEvent);
-  d->ScalarOpacityWidget->view()->spreadAllPoints(factor);
-  d->ScalarColorWidget->view()->spreadAllPoints(factor);
-  d->GradientWidget->view()->spreadAllPoints(factor);
+  d->ScalarOpacityWidget->view()
+    ->spreadAllPoints(factor, dontSpreadFirstAndLast);
+  d->ScalarColorWidget->view()
+    ->spreadAllPoints(factor, dontSpreadFirstAndLast);
+  d->GradientWidget->view()
+    ->spreadAllPoints(factor, dontSpreadFirstAndLast);
   d->VolumeProperty->InvokeEvent(vtkCommand::EndEvent);
 }

Libs/Visualization/VTK/Widgets/ctkVTKVolumePropertyWidget.h

@@ -66,14 +66,16 @@ public slots:
   /// Move all the control points of the opacity, colors and gradient
   /// of a give offset.
   /// \sa vtkControlPoints::movePoints()
-  void moveAllPoints(double xOffset, double yOffset = 0.);
+  void moveAllPoints(double xOffset, double yOffset = 0.,
+                     bool dontSpreadFirstAndLast = false);
 
   /// Spread all the control points of the opacity, colors and gradient
   /// by a given offset.
   /// A value >0 will space the control points, a value <0. will contract
   /// them.
   /// \sa vtkControlPoints::spreadPoints()
-  void spreadAllPoints(double factor = 1.);
+  void spreadAllPoints(double factor = 1.,
+                       bool dontSpreadFirstAndLast = false);
 
   void showThreshold(bool enable);