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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkWarpScalar.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 "vtkWarpScalar.h"

#include "vtkCellData.h"
#include "vtkDataArray.h"
#include "vtkDataSetAttributes.h"
#include "vtkInformation.h"
#include "vtkInformationVector.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPointSet.h"
#include "vtkPoints.h"

vtkCxxRevisionMacro(vtkWarpScalar, "$Revision: 1.50 $");
vtkStandardNewMacro(vtkWarpScalar);

vtkWarpScalar::vtkWarpScalar()
{
  this->ScaleFactor = 1.0;
  this->UseNormal = 0;
  this->Normal[0] = 0.0;
  this->Normal[1] = 0.0;
  this->Normal[2] = 1.0;
  this->XYPlane = 0;

  // by default process active point scalars
  this->SetInputArrayToProcess(0,0,0,vtkDataObject::FIELD_ASSOCIATION_POINTS,
                               vtkDataSetAttributes::SCALARS);
}

vtkWarpScalar::~vtkWarpScalar()
{
}

double *vtkWarpScalar::DataNormal(vtkIdType id, vtkDataArray *normals)
{
  return normals->GetTuple(id);
}

double *vtkWarpScalar::InstanceNormal(vtkIdType vtkNotUsed(id), 
                                     vtkDataArray *vtkNotUsed(normals))
{
  return this->Normal;
}

double *vtkWarpScalar::ZNormal(vtkIdType vtkNotUsed(id), 
                              vtkDataArray *vtkNotUsed(normals))
{
  static double zNormal[3]={0.0,0.0,1.0};
  return zNormal;
}

int vtkWarpScalar::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 ouptut
  vtkPointSet *input = vtkPointSet::SafeDownCast(
    inInfo->Get(vtkDataObject::DATA_OBJECT()));
  vtkPointSet *output = vtkPointSet::SafeDownCast(
    outInfo->Get(vtkDataObject::DATA_OBJECT()));

  vtkPoints *inPts;
  vtkDataArray *inNormals;
  vtkDataArray *inScalars;
  vtkPoints *newPts;
  vtkPointData *pd;
  int i;
  vtkIdType ptId, numPts;
  double x[3], *n, s, newX[3];
  
  vtkDebugMacro(<<"Warping data with scalars");

  // First, copy the input to the output as a starting point
  output->CopyStructure( input );

  inPts = input->GetPoints();
  pd = input->GetPointData();
  inNormals = pd->GetNormals();
  
  inScalars = this->GetInputArrayToProcess(0,inputVector);
  if ( !inPts || !inScalars )
    {
    vtkDebugMacro(<<"No data to warp");
    return 1;
    }

  numPts = inPts->GetNumberOfPoints();

  if ( inNormals && !this->UseNormal )
    {
    this->PointNormal = &vtkWarpScalar::DataNormal;
    vtkDebugMacro(<<"Using data normals");
    }
  else if ( this->XYPlane )
    {
    this->PointNormal = &vtkWarpScalar::ZNormal;
    vtkDebugMacro(<<"Using x-y plane normal");
    }
  else
    {
    this->PointNormal = &vtkWarpScalar::InstanceNormal;
    vtkDebugMacro(<<"Using Normal instance variable");
    }

  newPts = vtkPoints::New();
  newPts->SetNumberOfPoints(numPts);

  // Loop over all points, adjusting locations
  //
  for (ptId=0; ptId < numPts; ptId++)
    {
    if ( ! (ptId % 10000) ) 
      {
      this->UpdateProgress ((double)ptId/numPts);
      if (this->GetAbortExecute())
        {
        break;
        }
      }

    inPts->GetPoint(ptId, x);
    n = (this->*(this->PointNormal))(ptId,inNormals);
    if ( this->XYPlane )
      {
      s = x[2];
      }
    else
      {
      s = inScalars->GetComponent(ptId,0);
      }
    for (i=0; i<3; i++)
      {
      newX[i] = x[i] + this->ScaleFactor * s * n[i];
      }
    newPts->SetPoint(ptId, newX);
    }

  // Update ourselves and release memory
  //
  output->GetPointData()->CopyNormalsOff(); // distorted geometry 
  output->GetPointData()->PassData(input->GetPointData());
  output->GetCellData()->CopyNormalsOff(); // distorted geometry 
  output->GetCellData()->PassData(input->GetCellData());

  output->SetPoints(newPts);
  newPts->Delete();

  return 1;
}

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

  os << indent << "Scale Factor: " << this->ScaleFactor << "\n";
  os << indent << "Use Normal: " << (this->UseNormal ? "On\n" : "Off\n");
  os << indent << "Normal: (" << this->Normal[0] << ", " 
     << this->Normal[1] << ", " << this->Normal[2] << ")\n";
  os << indent << "XY Plane: " << (this->XYPlane ? "On\n" : "Off\n");
}