feature.h

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/*
 *   libpal - Automated Placement of Labels Library
 *
 *   Copyright (C) 2008 Maxence Laurent, MIS-TIC, HEIG-VD
 *                      University of Applied Sciences, Western Switzerland
 *                      http://www.hes-so.ch
 *
 *   Contact:
 *      maxence.laurent <at> heig-vd <dot> ch
 *    or
 *      eric.taillard <at> heig-vd <dot> ch
 *
 * This file is part of libpal.
 *
 * libpal is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * libpal 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with libpal.  If not, see <http://www.gnu.org/licenses/>.
 *
 */
 
#ifndef FEATURE_H
#define FEATURE_H
 
#define SIP_NO_FILE
 
 
#include "qgis_core.h"
#include "pointset.h"
#include "labelposition.h" // for LabelPosition enum
#include "qgslabelfeature.h"
#include "qgstextrendererutils.h"
#include <iostream>
#include <fstream>
#include <cmath>
#include <QString>
 
namespace pal
{
  class LabelPosition;
  class FeaturePart;
 
  class CORE_EXPORT FeaturePart : public PointSet
  {
 
    public:
 
      enum PathOffset
      {
        NoOffset,
        PositiveOffset,
        NegativeOffset
      };
 
      FeaturePart( QgsLabelFeature *lf, const GEOSGeometry *geom );
 
      FeaturePart( const FeaturePart &other );
 
      ~FeaturePart() override;
 
      QgsLabelFeature *feature() { return mLF; }
 
      Layer *layer();
 
      QgsFeatureId featureId() const;
 
      std::size_t maximumPointCandidates() const;
 
      std::size_t maximumLineCandidates() const;
 
      std::size_t maximumPolygonCandidates() const;
 
      std::vector<std::unique_ptr<LabelPosition> > createCandidates( Pal *pal );
 
      std::size_t createCandidatesAroundPoint( double x, double y, std::vector<std::unique_ptr<LabelPosition> > &lPos, double angle );
 
      std::size_t createCandidatesOverPoint( double x, double y, std::vector<std::unique_ptr<LabelPosition> > &lPos, double angle );
 
      std::size_t createCandidateCenteredOverPoint( double x, double y, std::vector<std::unique_ptr<LabelPosition> > &lPos, double angle );
 
      std::unique_ptr< LabelPosition > createCandidatePointOnSurface( PointSet *mapShape );
 
      std::size_t createCandidatesAtOrderedPositionsOverPoint( double x, double y, std::vector<std::unique_ptr<LabelPosition> > &lPos, double angle );
 
      std::size_t createCandidatesAlongLine( std::vector<std::unique_ptr<LabelPosition> > &lPos, PointSet *mapShape, bool allowOverrun, Pal *pal );
 
      std::size_t createHorizontalCandidatesAlongLine( std::vector<std::unique_ptr<LabelPosition> > &lPos, PointSet *mapShape, Pal *pal );
 
      std::size_t createCandidatesAlongLineNearStraightSegments( std::vector<std::unique_ptr<LabelPosition> > &lPos, PointSet *mapShape, Pal *pal );
 
      std::size_t createCandidatesAlongLineNearMidpoint( std::vector<std::unique_ptr<LabelPosition> > &lPos, PointSet *mapShape, double initialCost = 0.0, Pal *pal = nullptr );
 
      std::unique_ptr< LabelPosition > curvedPlacementAtOffset( PointSet *mapShape, const std::vector<double> &pathDistances,
          QgsTextRendererUtils::LabelLineDirection direction, double distance, bool &labeledLineSegmentIsRightToLeft, bool applyAngleConstraints, bool uprightOnly );
 
      std::size_t createCurvedCandidatesAlongLine( std::vector<std::unique_ptr<LabelPosition> > &lPos, PointSet *mapShape, bool allowOverrun, Pal *pal );
 
      std::size_t createCandidatesForPolygon( std::vector<std::unique_ptr<LabelPosition> > &lPos, PointSet *mapShape, Pal *pal );
 
      std::size_t createCandidatesOutsidePolygon( std::vector<std::unique_ptr<LabelPosition> > &lPos, Pal *pal );
 
      bool hasSameLabelFeatureAs( FeaturePart *part ) const;
 
      double getLabelWidth( double angle = 0.0 ) const { return mLF->size( angle ).width(); }
 
      double getLabelHeight( double angle = 0.0 ) const { return mLF->size( angle ).height(); }
 
      double getLabelDistance() const { return mLF->distLabel(); }
 
      bool hasFixedRotation() const { return mLF->hasFixedAngle(); }
 
      double fixedAngle() const { return mLF->fixedAngle(); }
 
      bool hasFixedPosition() const { return mLF->hasFixedPosition(); }
 
      bool alwaysShow() const { return mLF->alwaysShow(); }
 
      const QgsLabelObstacleSettings &obstacleSettings() const { return mLF->obstacleSettings(); }
 
      double repeatDistance() const { return mLF->repeatDistance(); }
 
      int getNumSelfObstacles() const { return mHoles.count(); }
      FeaturePart *getSelfObstacle( int i ) { return mHoles.at( i ); }
 
      bool isConnected( FeaturePart *p2 );
 
      bool mergeWithFeaturePart( FeaturePart *other );
 
      void addSizePenalty( std::vector<std::unique_ptr<LabelPosition> > &lPos, double bbx[4], double bby[4] ) const;
 
      double calculatePriority() const;
 
      bool onlyShowUprightLabels() const;
 
      int totalRepeats() const;
 
      void setTotalRepeats( int repeats );
 
    protected:
 
      QgsLabelFeature *mLF = nullptr;
      QList<FeaturePart *> mHoles;
 
      void extractCoords( const GEOSGeometry *geom );
 
    private:
 
      LabelPosition::Quadrant quadrantFromOffset() const;
 
      int mTotalRepeats = 0;
 
      mutable std::size_t mCachedMaxLineCandidates = 0;
      mutable std::size_t mCachedMaxPolygonCandidates = 0;
 
      FeaturePart &operator= ( const FeaturePart & ) = delete;
  };
 
} // end namespace pal
 
#endif