Palette.hpp

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#pragma ident "$Id: Palette.hpp 1644 2009-01-27 19:26:14Z ckiesch $"


//============================================================================
//
//  This file is part of GPSTk, the GPS Toolkit.
//
//  The GPSTk is free software; you can redistribute it and/or modify
//  it under the terms of the GNU Lesser General Public License as published
//  by the Free Software Foundation; either version 2.1 of the License, or
//  any later version.
//
//  The GPSTk is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU Lesser General Public License for more details.
//
//  You should have received a copy of the GNU Lesser General Public
//  License along with GPSTk; if not, write to the Free Software Foundation,
//  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//  
//  Copyright 2004, The University of Texas at Austin
//
//============================================================================

#ifndef VDRAW_PALETTE_H
#define VDRAW_PALETTE_H

#include <algorithm>

#include "Color.hpp"

namespace vdraw
{

  class Palette
  {
    public:
      Palette(const Color &base=Color::BLACK, double imin=0.0, double imax=1.0);

      Palette(const Palette &p);

      Palette& operator=(Palette p);

      ~Palette()
      {
      }

      void setRange(double imin, double imax)
      {
        if(imax<imin) 
        { 
          min = imax; 
          width=imin-imax; 
        }
        else
        {
          min = imin;
          width = imax-imin;
        }
      }

      void setColor(double val, const Color &c);

      Color getColor(double val) const;

      inline double getMin() const { return min; }

      inline double getMax() const { return min+width; }

      inline int getNumColors() const { return (int)palette.size(); }

    protected:
      double min;
      
      double width;

      std::list<std::pair<double,Color> > palette;

      inline void clamp(double &val) const
      {
        if(val<min)         val=getMin();
        if(val>(min+width)) val=getMax();
      }
  }; // class Palette

  
} // namespace vdraw

#endif // VDRAW_PALETTE_H

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