skyline.h

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//=============================================================================
//  MuseScore
//  Music Composition & Notation
//
//  Copyright (C) 2018 Werner Schweer
//
//  This program is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License version 2
//  as published by the Free Software Foundation and appearing in
//  the file LICENCE.GPL
//=============================================================================

#ifndef __SKYLINE_H__
#define __SKYLINE_H__

namespace Ms {

#ifndef NDEBUG
#define DEBUG_SKYLINE    // enable skyline debugging
#endif

class Segment;
class Shape;

//---------------------------------------------------------
//   SkylineSegment
//---------------------------------------------------------

struct SkylineSegment {
      qreal x;
      qreal y;
      qreal w;

      SkylineSegment(qreal _x, qreal _y, qreal _w) : x(_x), y(_y), w(_w) {}
      };

//---------------------------------------------------------
//   SkylineLine
//---------------------------------------------------------

class SkylineLine {
      const bool north;
      std::vector<SkylineSegment> seg;
      typedef std::vector<SkylineSegment>::iterator SegIter;
      typedef std::vector<SkylineSegment>::const_iterator SegConstIter;

      SegIter insert(SegIter i, qreal x, qreal y, qreal w);
      void append(qreal x, qreal y, qreal w);
      SegIter find(qreal x);
      SegConstIter find(qreal x) const;

   public:
      SkylineLine(bool n) : north(n) {}
      void add(const Shape& s);
      void add(const QRectF& r);
      void add(qreal x, qreal y, qreal w);
      void clear() { seg.clear(); }
      void paint(QPainter&) const;
      void dump() const;
      qreal minDistance(const SkylineLine&) const;
      qreal max() const;
      bool valid(const SkylineSegment& s) const;
      bool isNorth() const { return north; }

      SegIter begin() { return seg.begin(); }
      SegConstIter begin() const { return seg.begin(); }
      SegIter end() { return seg.end(); }
      SegConstIter end() const { return seg.end(); }
      };

//---------------------------------------------------------
//   Skyline
//---------------------------------------------------------

class Skyline {
      SkylineLine _north;
      SkylineLine _south;

   public:
      Skyline() : _north(true), _south(false) {}

      void clear();
      void add(const Shape& s);
      void add(const QRectF& r);

      qreal minDistance(const Skyline&) const;

      SkylineLine& north()             { return _north; }
      SkylineLine& south()             { return _south; }
      const SkylineLine& north() const { return _north; }
      const SkylineLine& south() const { return _south; }

      void paint(QPainter&) const;
      void dump(const char*, bool north = false) const;
      };

} // namespace Ms

#endif