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

  Program:   Visualization Toolkit
  Module:    vtkExtractPolyDataGeometry.h

  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.

=========================================================================*/
// .NAME vtkExtractPolyDataGeometry - extract vtkPolyData cells that lies either entirely inside or outside of a specified implicit function

// .SECTION Description
// vtkExtractPolyDataGeometry extracts from its input vtkPolyData all cells
// that are either completely inside or outside of a specified implicit
// function. This filter is specialized to vtkPolyData. On output the
// filter generates vtkPolyData.
//
// To use this filter you must specify an implicit function. You must also
// specify whether to extract cells laying inside or outside of the implicit
// function. (The inside of an implicit function is the negative values
// region.) An option exists to extract cells that are neither inside nor
// outside (i.e., boundary).
//
// Note that this filter also has the option to directly pass all points or cull
// the points that do not satisfy the implicit function test. Passing all points
// is a tad faster, but then points remain that do not pass the test and may mess
// up subsequent glyphing operations and so on. By default points are culled.
//
// A more general version of this filter is available for arbitrary
// vtkDataSet input (see vtkExtractGeometry).

// .SECTION See Also
// vtkExtractGeometry vtkClipPolyData

#ifndef vtkExtractPolyDataGeometry_h
#define vtkExtractPolyDataGeometry_h

#include "vtkFiltersExtractionModule.h" // For export macro
#include "vtkPolyDataAlgorithm.h"

class vtkImplicitFunction;

class VTKFILTERSEXTRACTION_EXPORT vtkExtractPolyDataGeometry : public vtkPolyDataAlgorithm
{
public:
  vtkTypeMacro(vtkExtractPolyDataGeometry,vtkPolyDataAlgorithm);
  void PrintSelf(ostream& os, vtkIndent indent);

  // Description:
  // Construct object with ExtractInside turned on.
  static vtkExtractPolyDataGeometry *New();

  // Description:
  // Return the MTime taking into account changes to the implicit function
  unsigned long GetMTime();

  // Description:
  // Specify the implicit function for inside/outside checks.
  virtual void SetImplicitFunction(vtkImplicitFunction*);
  vtkGetObjectMacro(ImplicitFunction,vtkImplicitFunction);

  // Description:
  // Boolean controls whether to extract cells that are inside of implicit
  // function (ExtractInside == 1) or outside of implicit function
  // (ExtractInside == 0).
  vtkSetMacro(ExtractInside,int);
  vtkGetMacro(ExtractInside,int);
  vtkBooleanMacro(ExtractInside,int);

  // Description:
  // Boolean controls whether to extract cells that are partially inside.
  // By default, ExtractBoundaryCells is off.
  vtkSetMacro(ExtractBoundaryCells,int);
  vtkGetMacro(ExtractBoundaryCells,int);
  vtkBooleanMacro(ExtractBoundaryCells,int);

  // Description:
  // Boolean controls whether points are culled or simply passed through
  // to the output.
  vtkSetMacro(PassPoints,int);
  vtkGetMacro(PassPoints,int);
  vtkBooleanMacro(PassPoints,int);

protected:
  vtkExtractPolyDataGeometry(vtkImplicitFunction *f=NULL);
  ~vtkExtractPolyDataGeometry();

  // Usual data generation method
  int RequestData(vtkInformation *, vtkInformationVector **, vtkInformationVector *);

  vtkImplicitFunction *ImplicitFunction;
  int ExtractInside;
  int ExtractBoundaryCells;
  int PassPoints;

  vtkIdType InsertPointInMap(vtkIdType i, vtkPoints *inPts, vtkPoints *newPts, vtkIdType *pointMap);

private:
  vtkExtractPolyDataGeometry(const vtkExtractPolyDataGeometry&);  // Not implemented.
  void operator=(const vtkExtractPolyDataGeometry&);  // Not implemented.
};

// Description:
// When not passing points, have to use a point map to keep track of things.
inline vtkIdType vtkExtractPolyDataGeometry::InsertPointInMap(vtkIdType i, vtkPoints *inPts,
                                                              vtkPoints *newPts, vtkIdType *pointMap)
{
  double x[3];
  inPts->GetPoint(i, x);
  pointMap[i] = newPts->InsertNextPoint(x);
  return pointMap[i];
}


#endif
