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Filtering/vtkColorTransferFunction.h

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

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


Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/
#ifndef __vtkColorTransferFunction_h
#define __vtkColorTransferFunction_h

#include "vtkScalarsToColors.h"
#include "vtkPiecewiseFunction.h"

#define VTK_CTF_RGB   0
#define VTK_CTF_HSV   1

class VTK_FILTERING_EXPORT vtkColorTransferFunction : public vtkScalarsToColors 
{
public:
  static vtkColorTransferFunction *New();
  vtkTypeMacro(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;};


  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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