Graphics/vtkThreshold.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkThreshold.h,v $
  Language:  C++

  Copyright (c) 1993-2002 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.

=========================================================================*/
#ifndef __vtkThreshold_h
#define __vtkThreshold_h

#include "vtkDataSetToUnstructuredGridFilter.h"

#define VTK_ATTRIBUTE_MODE_DEFAULT 0
#define VTK_ATTRIBUTE_MODE_USE_POINT_DATA 1
#define VTK_ATTRIBUTE_MODE_USE_CELL_DATA 2

class VTK_GRAPHICS_EXPORT vtkThreshold : public vtkDataSetToUnstructuredGridFilter
{
public:
  static vtkThreshold *New();
  vtkTypeRevisionMacro(vtkThreshold,vtkDataSetToUnstructuredGridFilter);
  void PrintSelf(ostream& os, vtkIndent indent);

  void ThresholdByLower(float lower);

  void ThresholdByUpper(float upper);

  void ThresholdBetween(float lower, float upper);


  vtkGetMacro(UpperThreshold,float);
  vtkGetMacro(LowerThreshold,float);


  vtkSetMacro(AttributeMode,int);
  vtkGetMacro(AttributeMode,int);
  void SetAttributeModeToDefault() 
    {this->SetAttributeMode(VTK_ATTRIBUTE_MODE_DEFAULT);};
  void SetAttributeModeToUsePointData() 
    {this->SetAttributeMode(VTK_ATTRIBUTE_MODE_USE_POINT_DATA);};
  void SetAttributeModeToUseCellData() 
    {this->SetAttributeMode(VTK_ATTRIBUTE_MODE_USE_CELL_DATA);};
  const char *GetAttributeModeAsString();


  vtkSetMacro(AllScalars,int);
  vtkGetMacro(AllScalars,int);
  vtkBooleanMacro(AllScalars,int);
  
protected:
  vtkThreshold();
  ~vtkThreshold();

//BTX
  // This is temporary solution. The vtkCutMaterial must be able
  // to call SelectInputScalars().
  friend class vtkCutMaterial;


  vtkGetStringMacro(InputScalarsSelection);
  virtual void SelectInputScalars(const char *fieldName) 
    {this->SetInputScalarsSelection(fieldName);}
//ETX
  
  // Usual data generation method
  void Execute();

  int   AllScalars;
  float LowerThreshold;
  float UpperThreshold;
  int   AttributeMode;

  //BTX
  int (vtkThreshold::*ThresholdFunction)(float s);
  //ETX

  int Lower(float s) {return ( s <= this->LowerThreshold ? 1 : 0 );};
  int Upper(float s) {return ( s >= this->UpperThreshold ? 1 : 0 );};
  int Between(float s) {return ( s >= this->LowerThreshold ? 
                               ( s <= this->UpperThreshold ? 1 : 0 ) : 0 );};

  char *InputScalarsSelection;
  vtkSetStringMacro(InputScalarsSelection);

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

#endif

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