File indexing completed on 2024-04-21 07:37:29

 // SPDX-License-Identifier: LGPL-2.1-or-later
 //
 // SPDX-FileCopyrightText: 2016 Akshat Tandon <akshat.tandon@research.iiit.ac.in>
 //
 
 #include "NodeReducer.h"
 #include "GeoDataPlacemark.h"
 #include "GeoDataLineString.h"
 #include "GeoDataPolygon.h"
 #include "GeoDataBuilding.h"
 #include "GeoDataMultiGeometry.h"
 #include "GeoDataCoordinates.h"
 #include "MarbleMath.h"
 
 #include <QDebug>
 #include <QVector>
 
 namespace Marble {
 
 NodeReducer::NodeReducer(GeoDataDocument* document, const TileId &tileId) :
     m_removedNodes(0),
     m_remainingNodes(0),
     m_zoomLevel(tileId.zoomLevel())
 {
     const GeoSceneMercatorTileProjection tileProjection;
     GeoDataLatLonBox tileBoundary = tileProjection.geoCoordinates(m_zoomLevel, tileId.x(), tileId.y());
     tileBoundary.scale(1.0-1e-4, 1.0-1e-4);
     tileBoundary.boundaries(m_tileBoundary[North], m_tileBoundary[South], m_tileBoundary[East], m_tileBoundary[West]);
 
     for (GeoDataPlacemark* placemark: document->placemarkList()) {
         GeoDataGeometry const * const geometry = placemark->geometry();
         auto const visualCategory = placemark->visualCategory();
         if (const auto prevLine = geodata_cast<GeoDataLineString>(geometry)) {
             GeoDataLineString* reducedLine = new GeoDataLineString;
             reduce(*prevLine, placemark->osmData(), visualCategory, reducedLine);
             placemark->setGeometry(reducedLine);
         } else if (m_zoomLevel < 17) {
             if (const auto prevRing = geodata_cast<GeoDataLinearRing>(geometry)) {
                 placemark->setGeometry(reducedRing(*prevRing, placemark, visualCategory));
             } else if (const auto prevPolygon = geodata_cast<GeoDataPolygon>(geometry)) {
                 placemark->setGeometry(reducedPolygon(*prevPolygon, placemark, visualCategory));
             } else if (const auto building = geodata_cast<GeoDataBuilding>(geometry)) {
                 if (const auto prevRing = geodata_cast<GeoDataLinearRing>(&building->multiGeometry()->at(0))) {
                     GeoDataLinearRing* ring = reducedRing(*prevRing, placemark, visualCategory);
                     GeoDataBuilding* newBuilding = new GeoDataBuilding(*building);
                     newBuilding->multiGeometry()->clear();
                     newBuilding->multiGeometry()->append(ring);
                     placemark->setGeometry(newBuilding);
                 } else if (const auto prevPolygon = geodata_cast<GeoDataPolygon>(&building->multiGeometry()->at(0))) {
                     GeoDataPolygon* poly = reducedPolygon(*prevPolygon, placemark, visualCategory);
                     GeoDataBuilding* newBuilding = new GeoDataBuilding(*building);
                     newBuilding->multiGeometry()->clear();
                     newBuilding->multiGeometry()->append(poly);
                     placemark->setGeometry(newBuilding);
                 }
             }
         }
     }
 }
 
 qint64 NodeReducer::remainingNodes() const
 {
     return m_remainingNodes;
 }
 
 qreal NodeReducer::epsilonFor(qreal multiplier) const
 {
     if (m_zoomLevel >= 17) {
         return 0.25;
     } else if (m_zoomLevel >= 10) {
         int const factor = 1 << (qAbs(m_zoomLevel-12));
         return multiplier / factor;
     } else {
         int const factor = 1 << (qAbs(m_zoomLevel-10));
         return multiplier * factor;
     }
 }
 
 qreal NodeReducer::perpendicularDistance(const GeoDataCoordinates &a, const GeoDataCoordinates &b, const GeoDataCoordinates &c) const
 {
     qreal ret;
     qreal const y0 = a.latitude();
     qreal const x0 = a.longitude();
     qreal const y1 = b.latitude();
     qreal const x1 = b.longitude();
     qreal const y2 = c.latitude();
     qreal const x2 = c.longitude();
     qreal const y01 = x0 - x1;
     qreal const x01 = y0 - y1;
     qreal const y10 = x1 - x0;
     qreal const x10 = y1 - y0;
     qreal const y21 = x2 - x1;
     qreal const x21 = y2 - y1;
     qreal const len = (x1 - x2) * (x1 - x2) + (y1 - y2) * (y1 - y2);
     qreal const t = len == 0.0 ? -1.0 : (x01 * x21 + y01 * y21) / len;
     if ( t < 0.0 ) {
         ret = EARTH_RADIUS * a.sphericalDistanceTo(b);
     } else if ( t > 1.0 ) {
         ret = EARTH_RADIUS * a.sphericalDistanceTo(c);
     } else {
         qreal const nom = qAbs( x21 * y10 - x10 * y21 );
         qreal const den = sqrt( x21 * x21 + y21 * y21 );
         ret = EARTH_RADIUS * nom / den;
     }
 
     return ret;
 }
 
 bool NodeReducer::touchesTileBorder(const GeoDataCoordinates &coordinates) const
 {
     return  coordinates.latitude() >= m_tileBoundary[North] ||
             coordinates.latitude() <= m_tileBoundary[South] ||
             coordinates.longitude() <= m_tileBoundary[West] ||
             coordinates.longitude() >= m_tileBoundary[East];
 }
 
 qint64 NodeReducer::removedNodes() const
 {
     return m_removedNodes;
 }
 
 GeoDataLinearRing *NodeReducer::reducedRing(const GeoDataLinearRing& prevRing,
                                             GeoDataPlacemark* placemark,
                                             const GeoDataPlacemark::GeoDataVisualCategory& visualCategory)
 {
     GeoDataLinearRing* reducedRing = new GeoDataLinearRing;
     reduce(prevRing, placemark->osmData(), visualCategory, reducedRing);
     return reducedRing;
 }
 
 GeoDataPolygon *NodeReducer::reducedPolygon(const GeoDataPolygon& prevPolygon,
                                             GeoDataPlacemark* placemark,
                                             const GeoDataPlacemark::GeoDataVisualCategory& visualCategory)
 {
     GeoDataPolygon* reducedPolygon = new GeoDataPolygon;
     GeoDataLinearRing const * prevRing = &(prevPolygon.outerBoundary());
     GeoDataLinearRing reducedRing;
     reduce(*prevRing, placemark->osmData().memberReference(-1), visualCategory, &reducedRing);
     reducedPolygon->setOuterBoundary(reducedRing);
     QVector<GeoDataLinearRing> const & innerBoundaries = prevPolygon.innerBoundaries();
     for(int i = 0; i < innerBoundaries.size(); i++) {
         prevRing = &innerBoundaries[i];
         GeoDataLinearRing reducedInnerRing;
         reduce(*prevRing, placemark->osmData().memberReference(i), visualCategory, &reducedInnerRing);
         reducedPolygon->appendInnerBoundary(reducedInnerRing);
     }
     return reducedPolygon;
 }
 
 }