Merge topic 'TemporalStatisticsFilter_warnings'

feb9251d Reducing output amount from vtkTemporalStatistics filter.
Acked-by: Kitware Robot <kwrobot@kitware.com>
Acked-by: David Thompson <david.thompson@kitware.com>
Merge-request: !1944

Filters/General/vtkTemporalStatistics.cxx

@@ -152,6 +152,7 @@ vtkTemporalStatistics::vtkTemporalStatistics()
   this->ComputeStandardDeviation = 1;
 
   this->CurrentTimeIndex = 0;
+  this->GeneratedChangingTopologyWarning = false;
 }
 
 vtkTemporalStatistics::~vtkTemporalStatistics()
@@ -730,9 +731,15 @@ vtkDataArray *vtkTemporalStatistics::GetArray(vtkFieldData *fieldData,
   if (   (inArray->GetNumberOfComponents() != outArray->GetNumberOfComponents())
       || (inArray->GetNumberOfTuples() != outArray->GetNumberOfTuples()) )
     {
-    vtkWarningMacro(<< "Size of array " << outArray->GetName()
-                    << " has changed.  Does the source change the topology "
-                    << " over time?");
+    if(!this->GeneratedChangingTopologyWarning)
+      {
+      std::string fieldType = vtkCellData::SafeDownCast(fieldData) == NULL ?
+        "points" : "cells";
+      vtkWarningMacro("The number of " << fieldType << " has changed between time "
+                      << "steps. No arrays of this type will be output since this "
+                      << "filter can not handle grids that change over time.");
+      this->GeneratedChangingTopologyWarning = true;
+      }
     fieldData->RemoveArray(outArray->GetName());
     return NULL;
     }

Filters/General/vtkTemporalStatistics.h

@@ -152,6 +152,12 @@ protected:
 private:
   vtkTemporalStatistics(const vtkTemporalStatistics &) VTK_DELETE_FUNCTION;
   void operator=(const vtkTemporalStatistics &) VTK_DELETE_FUNCTION;
+
+  // Description:
+  // Used to avoid multiple warnings for the same filter when
+  // the number of points or cells in the data set is changing
+  // between time steps.
+  bool GeneratedChangingTopologyWarning;
 };
 
 #endif //_vtkTemporalStatistics_h