vtkThreshold.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkThreshold.h,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.

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

#include "vtkUnstructuredGridAlgorithm.h"

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

// order / values are important because of the SetClampMacro
#define VTK_COMPONENT_MODE_USE_SELECTED    0
#define VTK_COMPONENT_MODE_USE_ALL         1
#define VTK_COMPONENT_MODE_USE_ANY         2

class vtkDataArray;

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

  void ThresholdByLower(double lower);

  void ThresholdByUpper(double upper);

  void ThresholdBetween(double lower, double upper);


  vtkGetMacro(UpperThreshold,double);
  vtkGetMacro(LowerThreshold,double);


  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();


  vtkSetClampMacro(ComponentMode,int,
                   VTK_COMPONENT_MODE_USE_SELECTED,
                   VTK_COMPONENT_MODE_USE_ANY);
  vtkGetMacro(ComponentMode,int);
  void SetComponentModeToUseSelected() 
    {this->SetComponentMode(VTK_COMPONENT_MODE_USE_SELECTED);};
  void SetComponentModeToUseAll() 
    {this->SetComponentMode(VTK_COMPONENT_MODE_USE_ALL);};
  void SetComponentModeToUseAny() 
    {this->SetComponentMode(VTK_COMPONENT_MODE_USE_ANY);};
  const char *GetComponentModeAsString();
  

  vtkSetClampMacro(SelectedComponent,int,0,VTK_INT_MAX);
  vtkGetMacro(SelectedComponent,int);
  

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

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

  virtual int FillInputPortInformation(int port, vtkInformation *info);

  int    AllScalars;
  double LowerThreshold;
  double UpperThreshold;
  int    AttributeMode;
  int    ComponentMode;
  int    SelectedComponent;
  
  //BTX
  int (vtkThreshold::*ThresholdFunction)(double s);
  //ETX

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

  int EvaluateComponents( vtkDataArray *scalars, vtkIdType id );
  
private:
  vtkThreshold(const vtkThreshold&);  // Not implemented.
  void operator=(const vtkThreshold&);  // Not implemented.
};

#endif

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