LabelPath.h

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#ifndef OSMSCOUT_MAP_SIMPLIFIEDPATH_H
#define OSMSCOUT_MAP_SIMPLIFIEDPATH_H
 
/*
  This source is part of the libosmscout-map library
  Copyright (C) 2017 Lukas Karas
 
  This library 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 (at your option) any later version.
 
  This library 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 this library; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
*/
 
#include <osmscoutmap/MapImportExport.h>
 
#include <vector>
 
#include <osmscout/Pixel.h>
 
namespace osmscout {
  struct Segment
  {
    Vertex2D start;
    double   offset;
    double   length;
    double   angle;
  };

  class OSMSCOUT_MAP_API LabelPath
  {
  private:
    double               length;
    std::vector<Segment> segments;
    std::vector<size_t>  offsetIndex; // segment offset by length 100
    double               minSegmentLength;
    Vertex2D             end;
    double               endDistance;
 
  public:
    explicit LabelPath(double minSegmentLength=5);
    virtual ~LabelPath();
    void AddPoint(const Vertex2D& point);
    double GetLength() const {
      return length+endDistance;
    }
    Vertex2D PointAtLength(double offset) const;
    double AngleAtLength(double offset) const;
    double AngleAtLengthDeg(double offset) const;

    bool TestAngleVariance(double startOffset, double endOffset, double maximumAngle) const;
 
  private:
    const Segment& SegmentBefore(double offset) const;
  };
}
 
#endif /* OSMSCOUT_MAP_SIMPLIFIEDPATH_H */