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

  Program:   Visualization Toolkit
  Module:    vtkHedgeHog.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 "vtkHedgeHog.h"

#include "vtkCellArray.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPoints.h"
#include "vtkPolyData.h"

vtkStandardNewMacro(vtkHedgeHog);

vtkHedgeHog::vtkHedgeHog()
{
  this->ScaleFactor = 1.0;
  this->VectorMode = VTK_USE_VECTOR;
  this->OutputPointsPrecision = vtkAlgorithm::DEFAULT_PRECISION;
}

int vtkHedgeHog::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
  vtkDataSet* input = vtkDataSet::SafeDownCast(inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkPolyData* output = vtkPolyData::SafeDownCast(outInfo->Get(vtkDataObject::DATA_OBJECT()));

  vtkIdType numPts;
  vtkPoints* newPts;
  vtkPointData* pd;
  vtkDataArray* inVectors;
  vtkDataArray* inNormals;
  vtkIdType ptId;
  int i;
  vtkIdType pts[2];
  vtkCellArray* newLines;
  double x[3], v[3];
  double newX[3];
  vtkPointData* outputPD = output->GetPointData();

  // Initialize
  //
  numPts = input->GetNumberOfPoints();
  pd = input->GetPointData();
  inVectors = pd->GetVectors();
  if (numPts < 1)
  {
    vtkErrorMacro(<< "No input data");
    return 1;
  }
  if (!inVectors && this->VectorMode == VTK_USE_VECTOR)
  {
    vtkErrorMacro(<< "No vectors in input data");
    return 1;
  }

  inNormals = pd->GetNormals();
  if (!inNormals && this->VectorMode == VTK_USE_NORMAL)
  {
    vtkErrorMacro(<< "No normals in input data");
    return 1;
  }
  outputPD->CopyAllocate(pd, 2 * numPts);

  newPts = vtkPoints::New();

  // Set the desired precision for the points in the output.
  if (this->OutputPointsPrecision == vtkAlgorithm::DEFAULT_PRECISION)
  {
    vtkPointSet* inputPointSet = vtkPointSet::SafeDownCast(input);
    if (inputPointSet)
    {
      newPts->SetDataType(inputPointSet->GetPoints()->GetDataType());
    }
    else
    {
      newPts->SetDataType(VTK_FLOAT);
    }
  }
  else if (this->OutputPointsPrecision == vtkAlgorithm::SINGLE_PRECISION)
  {
    newPts->SetDataType(VTK_FLOAT);
  }
  else if (this->OutputPointsPrecision == vtkAlgorithm::DOUBLE_PRECISION)
  {
    newPts->SetDataType(VTK_DOUBLE);
  }

  newPts->SetNumberOfPoints(2 * numPts);
  newLines = vtkCellArray::New();
  newLines->AllocateEstimate(numPts, 2);

  // Loop over all points, creating oriented line
  //
  for (ptId = 0; ptId < numPts; ptId++)
  {
    if (!(ptId % 10000)) // abort/progress
    {
      this->UpdateProgress(static_cast<double>(ptId) / numPts);
      if (this->GetAbortExecute())
      {
        break;
      }
    }

    input->GetPoint(ptId, x);
    if (this->VectorMode == VTK_USE_VECTOR)
    {
      inVectors->GetTuple(ptId, v);
    }
    else
    {
      inNormals->GetTuple(ptId, v);
    }
    for (i = 0; i < 3; i++)
    {
      newX[i] = x[i] + this->ScaleFactor * v[i];
    }

    pts[0] = ptId;
    pts[1] = ptId + numPts;

    newPts->SetPoint(pts[0], x);
    newPts->SetPoint(pts[1], newX);

    newLines->InsertNextCell(2, pts);

    outputPD->CopyData(pd, ptId, pts[0]);
    outputPD->CopyData(pd, ptId, pts[1]);
  }

  // Update ourselves and release memory
  //
  output->SetPoints(newPts);
  newPts->Delete();

  output->SetLines(newLines);
  newLines->Delete();

  return 1;
}

int vtkHedgeHog::FillInputPortInformation(int, vtkInformation* info)
{
  info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkDataSet");
  return 1;
}

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

  os << indent << "Scale Factor: " << this->ScaleFactor << "\n";
  os << indent << "Orient Mode: "
     << (this->VectorMode == VTK_USE_VECTOR ? "Orient by vector\n" : "Orient by normal\n");
  os << indent << "Output Points Precision: " << this->OutputPointsPrecision << "\n";
}
