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

  Program:   Visualization Toolkit
  Module:    vtkBlankStructuredGrid.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.

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

#include "vtkCellData.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkStructuredGrid.h"
#include "vtkUnsignedCharArray.h"

vtkStandardNewMacro(vtkBlankStructuredGrid);

// Construct object to extract all of the input data.
vtkBlankStructuredGrid::vtkBlankStructuredGrid()
{
  this->MinBlankingValue = VTK_FLOAT_MAX;
  this->MaxBlankingValue = VTK_FLOAT_MAX;
  this->ArrayName = NULL;
  this->ArrayId = -1;
  this->Component = 0;
}

vtkBlankStructuredGrid::~vtkBlankStructuredGrid()
{
  delete [] this->ArrayName;
  this->ArrayName = NULL;
}


template <class T>
void vtkBlankStructuredGridExecute(vtkBlankStructuredGrid *vtkNotUsed(self),
                                   T *dptr, int numPts, int numComp,
                                   int comp, double min, double max,
                                   vtkUnsignedCharArray *ghosts)
{
  T compValue;
  dptr += comp;

  for ( int ptId=0; ptId < numPts; ptId++, dptr+=numComp)
    {
    compValue = *dptr;
    unsigned char value = 0;
    if(compValue >= min && compValue <= max)
      {
      value |= vtkDataSetAttributes::HIDDENPOINT;
      }
    ghosts->SetValue(ptId, value);
    }
}


int vtkBlankStructuredGrid::RequestData(
  vtkInformation *vtkNotUsed(request),
  vtkInformationVector **inputVector,
  vtkInformationVector *outputVector)
{
  // get the info objects
  vtkInformation *inInfo = inputVector[0]->GetInformationObject(0);
  vtkInformation *outInfo = outputVector->GetInformationObject(0);

  // get the input and output
  vtkStructuredGrid *input = vtkStructuredGrid::SafeDownCast(
    inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkStructuredGrid *output = vtkStructuredGrid::SafeDownCast(
    outInfo->Get(vtkDataObject::DATA_OBJECT()));

  vtkPointData *pd=input->GetPointData();
  vtkCellData *cd=input->GetCellData();
  vtkPointData *outPD=output->GetPointData();
  vtkCellData *outCD=output->GetCellData();
  int numPts = input->GetNumberOfPoints();
  vtkDataArray *dataArray=NULL;
  int numComp;

  vtkDebugMacro(<< "Blanking Grid");

  // Pass input to output
  //
  output->CopyStructure(input);
  outPD->PassData(pd);
  outCD->PassData(cd);

  // Get the appropriate data array
  //
  if ( this->ArrayName != NULL )
    {
    dataArray = pd->GetArray(this->ArrayName);
    }
  else if ( this->ArrayId >= 0 )
    {
    dataArray = pd->GetArray(this->ArrayId);
    }

  if ( !dataArray ||
       (numComp=dataArray->GetNumberOfComponents()) <= this->Component )
    {
    vtkWarningMacro(<<"Data array not found");
    return 1;
    }
  void *dptr = dataArray->GetVoidPointer(0);

  // Loop over the data array setting anything within the data range specified
  // to be blanked.
  //
  vtkUnsignedCharArray *ghosts = vtkUnsignedCharArray::New();
  ghosts->SetNumberOfValues(numPts);
  ghosts->SetName(vtkDataSetAttributes::GhostArrayName());
  switch(dataArray->GetDataType())
    {
    vtkTemplateMacro(
      vtkBlankStructuredGridExecute(this, static_cast<VTK_TT *>(dptr), numPts,
                                    numComp, this->Component,
                                    this->MinBlankingValue,
                                    this->MaxBlankingValue, ghosts));
    default:
      break;
    }
  output->GetPointData()->AddArray(ghosts);
  ghosts->Delete();

  return 1;
}


void vtkBlankStructuredGrid::PrintSelf(ostream& os, vtkIndent indent)
{
  this->Superclass::PrintSelf(os,indent);

  os << indent << "Min Blanking Value: " << this->MinBlankingValue << "\n";
  os << indent << "Max Blanking Value: " << this->MaxBlankingValue << "\n";
  os << indent << "Array Name: ";
  if ( this->ArrayName )
    {
    os << this->ArrayName << "\n";
    }
  else
    {
    os << "(none)\n";
    }
  os << indent << "Array ID: " << this->ArrayId << "\n";
  os << indent << "Component: " << this->Component << "\n";
}
