lib/marble/TileId.cpp

0001 // SPDX-License-Identifier: LGPL-2.1-or-later
0002 //
0003 // SPDX-FileCopyrightText: 2008, 2010 Jens-Michael Hoffmann <jensmh@gmx.de>
0004 // SPDX-FileCopyrightText: 2012 Bernhard Beschow <bbeschow@cs.tu-berlin.de>
0005 //
0006
0007 // Own
0008 #include "TileId.h"
0009
0010 #include "GeoDataCoordinates.h"
0011
0012 #include <QDebug>
0013
0014 namespace Marble
0015 {
0016
0017 TileId::TileId( QString const & mapThemeId, int zoomLevel, int tileX, int tileY )
0018     : m_mapThemeIdHash( qHash( mapThemeId )), m_zoomLevel( zoomLevel ), m_tileX( tileX ), m_tileY( tileY )
0019 {
0020 }
0021
0022 TileId::TileId( uint mapThemeIdHash, int zoomLevel, int tileX, int tileY )
0023     : m_mapThemeIdHash( mapThemeIdHash ), m_zoomLevel( zoomLevel ), m_tileX( tileX ), m_tileY( tileY )
0024 {
0025 }
0026
0027 TileId::TileId()
0028     : m_mapThemeIdHash( 0 ), m_zoomLevel( 0 ), m_tileX( 0 ), m_tileY( 0 )
0029 {
0030 }
0031
0032 TileId TileId::fromCoordinates(const GeoDataCoordinates &coords, int zoomLevel)
0033 {
0034     if ( zoomLevel < 0 ) {
0035         return TileId();
0036     }
0037     const int maxLat = 90 * 1000000;
0038     const int maxLon = 180 * 1000000;
0039     int lat = GeoDataCoordinates::normalizeLat( coords.latitude( GeoDataCoordinates::Degree ), GeoDataCoordinates::Degree ) * 1000000;
0040     int lon = GeoDataCoordinates::normalizeLon( coords.longitude( GeoDataCoordinates::Degree ), GeoDataCoordinates::Degree ) * 1000000;
0041     int x = 0;
0042     int y = 0;
0043     for( int i=0; i<zoomLevel; ++i ) {
0044         const int deltaLat = maxLat >> i;
0045         if( lat <= ( maxLat - deltaLat )) {
0046             y += 1<<(zoomLevel-i-1);
0047             lat += deltaLat;
0048         }
0049         const int deltaLon = maxLon >> i;
0050         if( lon >= ( maxLon - deltaLon )) {
0051             x += 1<<(zoomLevel-i-1);
0052         } else {
0053             lon += deltaLon;
0054         }
0055     }
0056     return TileId(0, zoomLevel, x, y);
0057 }
0058
0059 }
0060
0061 #ifndef QT_NO_DEBUG_STREAM
0062 QDebug operator<<( QDebug dbg, const Marble::TileId &id )
0063 {
0064     return dbg << QString( "Marble::TileId(%1, %2, %3, %4)" ).arg( id.mapThemeIdHash() )
0065                                                              .arg( id.zoomLevel() )
0066                                                              .arg( id.x() )
0067                                                              .arg( id.y() );
0068 }
0069 #endif