---

Filtering/vtkColorTransferFunction.h

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

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

#include "vtkScalarsToColors.h"

class vtkPiecewiseFunction;

#define VTK_CTF_RGB   0
#define VTK_CTF_HSV   1

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

  void PrintSelf(ostream& os, vtkIndent indent);

  int GetSize() {return this->NumberOfPoints;};
  

  void AddRGBPoint( float x, float r, float g, float b );
  void AddHSVPoint( float x, float h, float s, float v );


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

  void RemovePoint( float x );
  void RemoveAllPoints();


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


  float GetRedValue( float x );
  float GetGreenValue( float x );
  float GetBlueValue( float x );

  virtual unsigned char *MapValue(float v);


  vtkGetVector2Macro( Range, float );


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

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


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

  vtkSetClampMacro( ColorSpace, int, VTK_CTF_RGB, VTK_CTF_HSV );
  void SetColorSpaceToRGB(){this->SetColorSpace(VTK_CTF_RGB);};
  void SetColorSpaceToHSV(){this->SetColorSpace(VTK_CTF_HSV);};
  vtkGetMacro( ColorSpace, int );
    

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


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

  // 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;
  
  // The color function
  float       *Function;
  int         FunctionSize;
  int         NumberOfPoints;

  // conversion methods
  void RGBToHSV( float r, float g, float b, float &h, float &s, float &v );
  void HSVToRGB( float h, float s, float v, float &r, float &g, float &b );
  
  // An evaluated color (0 to 255 RGBA A=255)
  unsigned char UnsignedCharRGBAValue[4];

  // The min and max point locations for all three transfer functions
  float Range[2]; 

  // Transfer functions for each color component
  // Remove after corresponding depricated methods are removed
  vtkPiecewiseFunction  *Red;
  vtkPiecewiseFunction  *Green;
  vtkPiecewiseFunction  *Blue;
  vtkTimeStamp BuildTime;
  unsigned char *Table;
  int TableSize;
  

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


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

#endif

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