---

Common/vtkScalarsToColors.h

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

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkScalarsToColors.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 __vtkScalarsToColors_h
#define __vtkScalarsToColors_h

#include "vtkObject.h"

class vtkDataArray;
class vtkUnsignedCharArray;

class VTK_COMMON_EXPORT vtkScalarsToColors : public vtkObject
{
public:
  vtkTypeRevisionMacro(vtkScalarsToColors,vtkObject);
  void PrintSelf(ostream& os, vtkIndent indent);
  
  virtual void Build() {};
  

  virtual float *GetRange() = 0;
  virtual void SetRange(float min, float max) = 0;
  void SetRange(float rng[2]) 
    {this->SetRange(rng[0],rng[1]);}
  
  virtual unsigned char *MapValue(float v) = 0;

  virtual void GetColor(float v, float rgb[3]) = 0;


  float *GetColor(float v) 
    {this->GetColor(v,this->RGB); return this->RGB;}


  virtual float GetOpacity(float vtkNotUsed(v)) 
    {return 1.0;}


  float GetLuminance(float x) 
    {float rgb[3]; this->GetColor(x,rgb);
    return static_cast<float>(rgb[0]*0.30 + rgb[1]*0.59 + rgb[2]*0.11);}


  void SetAlpha(float alpha);
  vtkGetMacro(Alpha,float);


  vtkUnsignedCharArray *MapScalars(vtkDataArray *scalars, int colorMode,
                                   int component);


  vtkSetMacro(VectorMode, int);
  vtkGetMacro(VectorMode, int);
  void SetVectorModeToMagnitude();
  void SetVectorModeToComponent();


  vtkSetMacro(VectorComponent, int);
  vtkGetMacro(VectorComponent, int);
  

  void MapScalarsThroughTable(vtkDataArray *scalars, 
                              unsigned char *output,
                              int outputFormat);
  void MapScalarsThroughTable(vtkDataArray *scalars, 
                              unsigned char *output) 
    {this->MapScalarsThroughTable(scalars,output,VTK_RGBA);}



  virtual void MapScalarsThroughTable2(void *input, unsigned char *output,
                                       int inputDataType, int numberOfValues,
                                       int inputIncrement, 
                                       int outputFormat) = 0;


  virtual vtkUnsignedCharArray *ConvertUnsignedCharToRGBA(
    vtkUnsignedCharArray *colors, int numComp, int numTuples);

protected:
  vtkScalarsToColors();
  ~vtkScalarsToColors() {}

  float Alpha;

  // How to map arrays with multiple components.
  int VectorMode;
  // Internal flag used to togle between vector and component mode.
  // We need this flag because the mapper can override our mode, and
  // I do not want to change the interface to the map scalars methods.
  int UseMagnitude;
  int VectorComponent;

//BTX
  enum VectorModes {
    MAGNITUDE=0,
    COMPONENT=1
  };
//ETX

private:
  float RGB[3];
private:
  vtkScalarsToColors(const vtkScalarsToColors&);  // Not implemented.
  void operator=(const vtkScalarsToColors&);  // Not implemented.
};

#endif

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