ColorScale.h

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#ifndef EVDB_COLORSCALE_H
#define EVDB_COLORSCALE_H
#include <string>

namespace evdb {
  enum _color_scales {
    kRainbow,       
    kInvRainbow,    
    kLinGray,       
    kColdToHot,     
    kBlueToRed,     
    kBlueToRedII,   
    kHeatedObject,  
    kReds,          
    kGreens,        
    kBlues,         
    kGeographic,    
    kBlueToGreen,   
    kBlueToOrange,  
    kGreenToMagenta,
    kSequential,    
    kFocus,         
    kCustom         
  };
  
  enum _scale_options {
    kLinear, 
    kLog,    
    kSqrt    
  };
  
  class ColorScale {
  public:
    ColorScale(double xlo, double xhi, 
               int which=kRainbow,
               int scale=kLinear,
               int n=40, 
               double h1=0, double h2=0, 
               double v1=0, double v2=0);

    int  operator()(double x) const;
    int  GetColor(double x)   const;
    bool InBounds(double x)   const;
    void SetPalette();
    void SetBounds(double xlo, double xhi) { fXlo = xlo; fXhi = xhi; }
    void SetUnderFlowColor(int c);
    void SetOverFlowColor(int c);
    void Reverse();

    static int Palette(const std::string& nm);
    static int Scale(const std::string& nm);

  private:
    void HSVtoRGB(double  h, double  s, double v,
                  double* r, double* g, double* b) const;

    void MakeHSVScale(int n, double h1, double h2, double vs1, double vs2);
    void MakeSequential();
    void MakeFocus();
    void MakeInvRainbow();
    void MakeRainbow();
    void MakeGreenToMagenta();
    void MakeBlueToRed();
    void MakeBlueToRedII();
    void MakeBlueToGreen();
    void MakeBlueToOrange();
    void MakeBrownToBlue();
    void MakeLinGray();
    void MakeHeatedObject();
    
  private:
    double fXlo;            
    double fXhi;            
    int    fScale;          
    int    fNcolor;         
    int    fColors[256];    
    int    fUnderFlowColor; 
    int    fOverFlowColor;  
  };
}
#endif