vtkPiecewiseFunction.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkPiecewiseFunction.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 __vtkPiecewiseFunction_h
#define __vtkPiecewiseFunction_h

#include "vtkDataObject.h"

class VTK_FILTERING_EXPORT vtkPiecewiseFunction : public vtkDataObject
{
public:
  static vtkPiecewiseFunction *New();
  vtkTypeRevisionMacro(vtkPiecewiseFunction,vtkDataObject);
  void PrintSelf(ostream& os, vtkIndent indent);

  void Initialize();
  void DeepCopy( vtkDataObject *f );
  void ShallowCopy( vtkDataObject *f );

  int GetDataObjectType() {return VTK_PIECEWISE_FUNCTION;};
  
  int  GetSize();


  int AddPoint( double x, double val );
  int RemovePoint( double x );

  void RemoveAllPoints();

  void AddSegment( double x1, double val1, double x2, double val2 );

  double GetValue( double x );


  double *GetDataPointer() {return this->Function;};
  void FillFromDataPointer(int, double*);

  double *GetRange();


  void GetTable( double x1, double x2, int size, float *table, int stride=1 );
  void GetTable( double x1, double x2, int size, double *table, int stride=1 );


  void BuildFunctionFromTable( double x1, double x2, int size,
                               double *table, int stride=1 );
  

  vtkSetMacro( Clamping, int );
  vtkGetMacro( Clamping, int );
  vtkBooleanMacro( Clamping, int );

  const char  *GetType();

  unsigned long GetMTime();

  double GetFirstNonZeroValue();

protected:
  vtkPiecewiseFunction();
  ~vtkPiecewiseFunction();

  // Size of the array used to store function points
  int   ArraySize;

  // Determines the function value outside of defined points
  // Zero = always return 0.0 outside of defined points
  // One  = clamp to the lowest value below defined points and
  //        highest value above defined points
  int   Clamping;

  // Array of points ((X,Y) pairs)
  double *Function;

  // Number of points used to specify function
  int   FunctionSize;

  // Min and max range of function point locations
  double FunctionRange[2];

  // Increases size of the function array. The array grows by a factor of 2
  // when the array limit has been reached.
  void IncreaseArraySize();

  // Private function to add a point to the function. Returns the array
  // index of the inserted point.
  int InsertPoint( double x, double val );

  // Move points one index down or up in the array. This is useful for 
  // inserting and deleting points into the array.
  void MovePoints( int index, int down );
private:
  vtkPiecewiseFunction(const vtkPiecewiseFunction&);  // Not implemented.
  void operator=(const vtkPiecewiseFunction&);  // Not implemented.
};

#endif

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