Splitter.hpp

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#pragma ident "$Id: Splitter.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 VPLOT_SPLITTER_H
#define VPLOT_SPLITTER_H

#include <vector>
#include <list>
#include <map>
#include <memory>

#include "Path.hpp"

namespace vplot
{
  class Splitter
  {
  public:
    static std::pair<std::list<vdraw::Path*>*,std::list<vdraw::Path*>*> 
      splith(double splitter, vdraw::Path* p, bool top, bool bottom, bool continuous=false);

    static std::list<vdraw::Path*>* splitvgap(double gap, vdraw::Path* p);

    inline static bool inBox(const std::pair<double,double>& p, 
        double minX, double maxX, double minY, double maxY)
    {
      return !((p.first<minX || p.first>maxX) || (p.second<minY || p.second>maxY));
    }

    static std::pair<double,double> intersectBox(
        const std::pair<double,double> inside, const std::pair<double,double> outside, 
        double minX, double maxX, double minY, double maxY);

    static std::auto_ptr< std::list< vdraw::Path > > interpToBox(double minX, double maxX, double minY, double maxY, const vdraw::Path& p);

    static std::auto_ptr< vdraw::Path > cropToBox(double minX, double maxX, double minY, double maxY, const vdraw::Path& p);

  private:
    static inline double intersecth(double y, const std::pair<double,double>& p1, const std::pair<double,double>& p2)
    {
      double ratio = (y - p1.second) / (p2.second - p1.second);
      double xdist = p2.first - p1.first;
      return p1.first + xdist*ratio;
    }

    static inline double intersectv(double x, const std::pair<double,double>& p1, const std::pair<double,double>& p2)
    {
      double ratio = (x - p1.first) / (p2.first - p1.first);
      double ydist = p2.second - p1.second;
      return p1.second + ydist*ratio;
    }
  };
}

#endif

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