/*=========================================================================

  Program:   Visualization Toolkit
  Module:    TestGenericDataSetTessellator.cxx

  Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
  All rights reserved.
  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
     PURPOSE.  See the above copyright notice for more information.

=========================================================================*/
// This example demonstrates how to implement a vtkGenericDataSet
// (here vtkBridgeDataSet) and to use vtkGenericDataSetTessellator filter on
// it.
// 
// The command line arguments are:
// -I        => run in interactive mode; unless this is used, the program will
//              not allow interaction and exit
// -D <path> => path to the data; the data should be in <path>/Data/

#define WRITE_GENERIC_RESULT

#define WITH_GEOMETRY_FILTER

#include "vtkActor.h"
#include "vtkDebugLeaks.h"
#include "vtkPointData.h"
#include "vtkProperty.h"
#include "vtkTestUtilities.h"
#include "vtkRegressionTestImage.h"
#include "vtkRenderer.h"
#include "vtkRenderWindow.h"
#include "vtkRenderWindowInteractor.h"
#include "vtkUnstructuredGrid.h"
#include "vtkXMLUnstructuredGridReader.h"
#include "vtkBridgeDataSet.h"
#include "vtkGenericDataSetTessellator.h"
#include "vtkGenericCellTessellator.h"
#include "vtkGenericSubdivisionErrorMetric.h"
#include <assert.h>
#include "vtkLookupTable.h"
#include "vtkDataSetMapper.h"
#include "vtkLabeledDataMapper.h"
#include "vtkActor2D.h"
#include "vtkCommand.h"
#include "vtkGeometricErrorMetric.h"
#include "vtkAttributesErrorMetric.h"
#include "vtkSimpleCellTessellator.h"

#ifdef WITH_GEOMETRY_FILTER
#include "vtkGeometryFilter.h"
#include "vtkPolyDataMapper.h"
#endif

#ifdef WRITE_GENERIC_RESULT
# include "vtkXMLUnstructuredGridWriter.h"
#endif // #ifdef WRITE_GENERIC_RESULT

// debugging when clipping on n=(1,1,1) c=(0.5,0,0)
//#include "vtkExtractGeometry.h"
//#include "vtkSphere.h"

// Remark about the lookup tables that seem different between the
// GenericGeometryFilter and GenericDataSetTessellator:
// the lookup table is set for the whole unstructured grid, the tetra plus
// the triangle. The lookup table changed because of the tetra: the
// GenericDataSetTessellator need to create inside sub-tetra that have
// minimal attributes, the GenericGeometryFilter just need to tessellate the
// face of the tetra, for which the values at points are not minimal.

class SwitchLabelsCallback
  : public vtkCommand
{
public:
  static SwitchLabelsCallback *New()
    { return new SwitchLabelsCallback; }
  
  void SetLabeledDataMapper(vtkLabeledDataMapper *aLabeledDataMapper)
    {
      this->LabeledDataMapper=aLabeledDataMapper;
    }
  void SetRenderWindow(vtkRenderWindow *aRenWin)
    {
      this->RenWin=aRenWin;
    }
  
  virtual void Execute(vtkObject *vtkNotUsed(caller), unsigned long, void*)
    {
      if(this->LabeledDataMapper->GetLabelMode()==VTK_LABEL_SCALARS)
        {
        this->LabeledDataMapper->SetLabelMode(VTK_LABEL_IDS);
        }
      else
        {
        this->LabeledDataMapper->SetLabelMode(VTK_LABEL_SCALARS);
        }
      this->RenWin->Render();
    }
protected:
  vtkLabeledDataMapper *LabeledDataMapper;
  vtkRenderWindow *RenWin;
};

int TestGenericDataSetTessellator(int argc, char* argv[])
{
  // Standard rendering classes
  vtkRenderer *renderer = vtkRenderer::New();
  vtkRenderWindow *renWin = vtkRenderWindow::New();
  renWin->AddRenderer(renderer);
  vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
  iren->SetRenderWindow(renWin);

  // Load the mesh geometry and data from a file
  vtkXMLUnstructuredGridReader *reader = vtkXMLUnstructuredGridReader::New();
  char *cfname = vtkTestUtilities::ExpandDataFileName(argc, argv, "Data/quadraticTetra01.vtu");
//  char *cfname = vtkTestUtilities::ExpandDataFileName(argc, argv, "Data/quadTet4.vtu");
//  char *cfname = vtkTestUtilities::ExpandDataFileName(argc, argv, "Data/tetraMesh.vtu");
//  char *cfname = vtkTestUtilities::ExpandDataFileName(argc, argv, "Data/Test2_Volume.vtu");
  
//  char *cfname = vtkTestUtilities::ExpandDataFileName(argc, argv, "Data/quadHexa01.vtu");
//  char *cfname = vtkTestUtilities::ExpandDataFileName(argc, argv, "Data/quadQuad01.vtu");
  
  reader->SetFileName( cfname );
  delete[] cfname;
  
  // Force reading
  reader->Update();

  // Initialize the bridge
  vtkBridgeDataSet *ds=vtkBridgeDataSet::New();
  ds->SetDataSet( reader->GetOutput() );
  reader->Delete();
  
  // Set the error metric thresholds:
  // 1. for the geometric error metric
  vtkGeometricErrorMetric *geometricError=vtkGeometricErrorMetric::New();
  geometricError->SetRelativeGeometricTolerance(0.1,ds);
  
  ds->GetTessellator()->GetErrorMetrics()->AddItem(geometricError);
  geometricError->Delete();
  
  // 2. for the attribute error metric
  vtkAttributesErrorMetric *attributesError=vtkAttributesErrorMetric::New();
  attributesError->SetAttributeTolerance(0.01); // 0.11, 0.005
  
  ds->GetTessellator()->GetErrorMetrics()->AddItem(attributesError);
  attributesError->Delete();
  cout<<"input unstructured grid: "<<ds<<endl;
  
  static_cast<vtkSimpleCellTessellator *>(ds->GetTessellator())->SetSubdivisionLevels(0,100);
  vtkIndent indent;
  ds->PrintSelf(cout,indent);
  
  // Create the filter
  vtkGenericDataSetTessellator *tessellator = vtkGenericDataSetTessellator::New();
  tessellator->SetInputData(ds);

  tessellator->Update(); //So that we can call GetRange() on the scalars
  
  assert(tessellator->GetOutput()!=0);
  
  // for debugging clipping on the hexa
#if 0
  vtkExtractGeometry *eg=vtkExtractGeometry::New();
  eg->SetInputConnection(tessellator->GetOutputPort());
  
  vtkSphere *sphere=vtkSphere::New();
  sphere->SetRadius(0.1);
  sphere->SetCenter(0,0,0);
  
  eg->SetImplicitFunction(sphere);
  eg->SetExtractInside(1);
  eg->SetExtractBoundaryCells(0);
  
  vtkXMLUnstructuredGridWriter *cwriter=vtkXMLUnstructuredGridWriter::New();
  cwriter->SetInputConnection(eg->GetOutputPort());
  cwriter->SetFileName("extracted_tessellated.vtu");
  cwriter->SetDataModeToAscii();
  cwriter->Write();
  
  cwriter->Delete();
  sphere->Delete();
  eg->Delete();
#endif
  
  // This creates a blue to red lut.
  vtkLookupTable *lut = vtkLookupTable::New(); 
  lut->SetHueRange (0.667, 0.0);
  
#ifdef WITH_GEOMETRY_FILTER
  vtkGeometryFilter *geom = vtkGeometryFilter::New();
  geom->SetInputConnection(tessellator->GetOutputPort());
  vtkPolyDataMapper *mapper = vtkPolyDataMapper::New();
  mapper->SetInputConnection( geom->GetOutputPort() );
  geom->Delete();
#else
  vtkDataSetMapper *mapper = vtkDataSetMapper::New();
  mapper->SetInputConnection( tessellator->GetOutputPort() );
#endif
  mapper->SetLookupTable(lut);
  if(tessellator->GetOutput()->GetPointData()!=0)
    {
    if(tessellator->GetOutput()->GetPointData()->GetScalars()!=0)
      {
      mapper->SetScalarRange( tessellator->GetOutput()->GetPointData()->
                              GetScalars()->GetRange());
      }
    }
  
  vtkActor *actor = vtkActor::New();
  actor->SetMapper(mapper);
  renderer->AddActor(actor);
  
#ifdef WRITE_GENERIC_RESULT
  // Save the result of the filter in a file
  vtkXMLUnstructuredGridWriter *writer=vtkXMLUnstructuredGridWriter::New();
  writer->SetInputConnection(tessellator->GetOutputPort());
  writer->SetFileName("tessellated.vtu");
  writer->SetDataModeToAscii();
  writer->Write();
  writer->Delete();
#endif // #ifdef WRITE_GENERIC_RESULT

  vtkActor2D *actorLabel=vtkActor2D::New();
  vtkLabeledDataMapper *labeledDataMapper=vtkLabeledDataMapper::New();
  labeledDataMapper->SetLabelMode(VTK_LABEL_IDS);
  labeledDataMapper->SetInputConnection(tessellator->GetOutputPort());
  actorLabel->SetMapper(labeledDataMapper);
  labeledDataMapper->Delete();
  renderer->AddActor(actorLabel);
  actorLabel->SetVisibility(0);
  actorLabel->Delete();
  
  // Standard testing code.
  renderer->SetBackground(0.5,0.5,0.5);
  renWin->SetSize(300,300);
  renWin->Render();
  
  tessellator->GetOutput()->PrintSelf(cout,indent);
  
  int retVal = vtkRegressionTestImage( renWin );
  if ( retVal == vtkRegressionTester::DO_INTERACTOR)
    {
    SwitchLabelsCallback *switchLabels=SwitchLabelsCallback::New();
    switchLabels->SetRenderWindow(renWin);
    switchLabels->SetLabeledDataMapper(labeledDataMapper);
    iren->AddObserver(vtkCommand::UserEvent,switchLabels);
    switchLabels->Delete();
    iren->Start();
    }

  // Cleanup
  renderer->Delete();
  renWin->Delete();
  iren->Delete();
  mapper->Delete();
  actor->Delete();
  tessellator->Delete();
  ds->Delete();
  lut->Delete();
  
  return !retVal;
}
