dox/Filtering/vtkColorTransferFunction.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkColorTransferFunction.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 __vtkColorTransferFunction_h
#define __vtkColorTransferFunction_h

#include "vtkScalarsToColors.h"

class vtkColorTransferFunctionInternals;

#define VTK_CTF_RGB           0
#define VTK_CTF_HSV           1
#define VTK_CTF_LAB           2
#define VTK_CTF_DIVERGING     3

#define VTK_CTF_LINEAR        0
#define VTK_CTF_LOG10         1

class VTK_FILTERING_EXPORT vtkColorTransferFunction : public vtkScalarsToColors 
{
public:
  static vtkColorTransferFunction *New();
  vtkTypeRevisionMacro(vtkColorTransferFunction,vtkScalarsToColors);
  void DeepCopy( vtkColorTransferFunction *f );
  void ShallowCopy( vtkColorTransferFunction *f );

  void PrintSelf(ostream& os, vtkIndent indent);

  int GetSize();
  

  int AddRGBPoint( double x, double r, double g, double b );
  int AddRGBPoint( double x, double r, double g, double b, 
                   double midpoint, double sharpness );
  int AddHSVPoint( double x, double h, double s, double v );
  int AddHSVPoint( double x, double h, double s, double v,
                   double midpoint, double sharpness );
  int RemovePoint( double x );


  void AddRGBSegment( double x1, double r1, double g1, double b1, 
                      double x2, double r2, double g2, double b2 );
  void AddHSVSegment( double x1, double h1, double s1, double v1, 
                      double x2, double h2, double s2, double v2 );
  
  void RemoveAllPoints();


  double *GetColor(double x) {
    return vtkScalarsToColors::GetColor(x); }
  void GetColor(double x, double rgb[3]);


  double GetRedValue( double x );
  double GetGreenValue( double x );
  double GetBlueValue( double x );


  int GetNodeValue( int index, double val[6] );
  int SetNodeValue( int index, double val[6] );
  
  virtual unsigned char *MapValue(double v);


  vtkGetVector2Macro( Range, double );

  int AdjustRange(double range[2]);


  void GetTable( double x1, double x2, int n, double* table );
  void GetTable( double x1, double x2, int n, float* table );
  const unsigned char *GetTable( double x1, double x2, int n);

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


  vtkSetClampMacro( Clamping, int, 0, 1 );
  vtkGetMacro( Clamping, int );
  vtkBooleanMacro( Clamping, int );
  

  vtkSetClampMacro( ColorSpace, int, VTK_CTF_RGB, VTK_CTF_DIVERGING );
  void SetColorSpaceToRGB(){this->SetColorSpace(VTK_CTF_RGB);};
  void SetColorSpaceToHSV(){this->SetColorSpace(VTK_CTF_HSV);};
  void SetColorSpaceToLab(){this->SetColorSpace(VTK_CTF_LAB);};
  void SetColorSpaceToDiverging(){this->SetColorSpace(VTK_CTF_DIVERGING);}
  vtkGetMacro( ColorSpace, int );
  vtkSetMacro(HSVWrap, int);
  vtkGetMacro(HSVWrap, int);
  vtkBooleanMacro(HSVWrap, int);


  vtkSetMacro(Scale,int);
  void SetScaleToLinear() { this->SetScale(VTK_CTF_LINEAR); };
  void SetScaleToLog10() { this->SetScale(VTK_CTF_LOG10); };
  vtkGetMacro(Scale,int);
    

  double *GetDataPointer();
  void FillFromDataPointer(int, double*);


  virtual void MapScalarsThroughTable2(void *input, unsigned char *output,
                                     int inputDataType, int numberOfValues,
                                     int inputIncrement, int outputIncrement);
  

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

protected:
  vtkColorTransferFunction();
  ~vtkColorTransferFunction();

  vtkColorTransferFunctionInternals *Internal;
  
  // 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;

  // The color space in which interpolation is performed
  int ColorSpace;

  // Specify if HSW is warp or not
  int HSVWrap;

  // The color interpolation scale (linear or logarithmic).
  int Scale;
  
  double     *Function;
  
  // The min and max node locations
  double Range[2];
  
  // An evaluated color (0 to 255 RGBA A=255)
  unsigned char UnsignedCharRGBAValue[4];

  int AllowDuplicateScalars;

  vtkTimeStamp BuildTime;
  unsigned char *Table;
  int TableSize;
  

  virtual void SetRange(double, double) {};
  void SetRange(double rng[2]) {this->SetRange(rng[0],rng[1]);};

  // Internal method to sort the vector and update the
  // Range whenever a node is added or removed
  void SortAndUpdateRange();
 
  void MovePoint(double oldX, double newX);

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

#endif

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