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

  Program:   Visualization Toolkit
  Module:    $RCSfile: task2.cxx,v $

  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.

=========================================================================*/
#include "TaskParallelism.h"

#include "vtkImageData.h"
#include "vtkPolyDataMapper.h"

// Task 2 for TaskParallelism.
// See TaskParallelism.cxx for more information.
vtkPolyDataMapper* task2(vtkRenderWindow* renWin, double data,
                         vtkCamera* cam)
{  
  double extent = data;
  int iextent = static_cast<int>(data);  
  // The pipeline

  // Synthetic image source.
  vtkRTAnalyticSource* source1 = vtkRTAnalyticSource::New();
  source1->SetWholeExtent (-1*iextent, iextent, -1*iextent, iextent, 
                           -1*iextent, iextent );
  source1->SetCenter(0, 0, 0);
  source1->SetStandardDeviation( 0.5 );
  source1->SetMaximum( 255.0 );
  source1->SetXFreq( 60 );
  source1->SetXMag( 10 );
  source1->SetYFreq( 30 );
  source1->SetYMag( 18 );
  source1->SetZFreq( 40 );
  source1->SetZMag( 5 );
  source1->GetOutput()->SetSpacing(2.0/extent,2.0/extent,2.0/extent);

  // Gradient vector.
  vtkImageGradient* grad = vtkImageGradient::New();
  grad->SetDimensionality( 3 );
  grad->SetInputConnection(source1->GetOutputPort());

  vtkImageShrink3D* mask = vtkImageShrink3D::New();
  mask->SetInputConnection(grad->GetOutputPort());
  mask->SetShrinkFactors(5, 5, 5);


  // Label the scalar field as the active vectors.
  vtkAssignAttribute* aa = vtkAssignAttribute::New();
  aa->SetInputConnection(mask->GetOutputPort());
  aa->Assign(vtkDataSetAttributes::SCALARS, vtkDataSetAttributes::VECTORS,
             vtkAssignAttribute::POINT_DATA);

  vtkGlyphSource2D* arrow = vtkGlyphSource2D::New();
  arrow->SetGlyphTypeToArrow();
  arrow->SetScale(0.2);
  arrow->FilledOff();

  // Glyph the gradient vector (with arrows)
  vtkGlyph3D* glyph = vtkGlyph3D::New();
  glyph->SetInputConnection(aa->GetOutputPort());
  glyph->SetSource(arrow->GetOutput());
  glyph->ScalingOff();
  glyph->OrientOn();
  glyph->SetVectorModeToUseVector();
  glyph->SetColorModeToColorByVector();

  // Rendering objects.
  vtkPolyDataMapper* mapper = vtkPolyDataMapper::New();
  mapper->SetInputConnection(glyph->GetOutputPort());
  mapper->SetScalarRange(50, 180);
  mapper->ImmediateModeRenderingOn();

  vtkActor* actor = vtkActor::New();
  actor->SetMapper(mapper);

  vtkRenderer* ren = vtkRenderer::New();
  renWin->AddRenderer(ren);

  ren->AddActor(actor);
  ren->SetActiveCamera( cam );

  // Cleanup
  source1->Delete();
  grad->Delete();
  aa->Delete();
  mask->Delete();
  glyph->Delete();
  arrow->Delete();
  actor->Delete();
  ren->Delete();

  return mapper;
}