1 #include "OsmTileClusterRenderer.h"
2
3 #include "ReadOnlyMapImage.h"
4
5 #include <QDebug>
6 #include <QTime>
7
8 #include <cmath>
9
OsmTileClusterRenderer(QObject * const parent)10 OsmTileClusterRenderer::OsmTileClusterRenderer( QObject * const parent )
11 : QObject( parent ),
12 m_osmTileEdgeLengthPixel( 256 ),
13 m_emptyPixel( qRgba( 0, 0, 0, 255 )),
14 m_osmBaseDirectory(),
15 m_osmTileLevel(),
16 m_osmMapEdgeLengthPixel(),
17 m_clusterEdgeLengthTiles(),
18 m_mapSourceDefinitions(),
19 m_mapSources(),
20 m_mapSourceCount()
21 {
22 }
23
setClusterEdgeLengthTiles(int const clusterEdgeLengthTiles)24 void OsmTileClusterRenderer::setClusterEdgeLengthTiles( int const clusterEdgeLengthTiles )
25 {
26 m_clusterEdgeLengthTiles = clusterEdgeLengthTiles;
27 }
28
setMapSources(QVector<ReadOnlyMapDefinition> const & mapSourceDefinitions)29 void OsmTileClusterRenderer::setMapSources( QVector<ReadOnlyMapDefinition> const & mapSourceDefinitions )
30 {
31 m_mapSourceDefinitions = mapSourceDefinitions;
32 }
33
setOsmBaseDirectory(QDir const & osmBaseDirectory)34 void OsmTileClusterRenderer::setOsmBaseDirectory( QDir const & osmBaseDirectory )
35 {
36 m_osmBaseDirectory = osmBaseDirectory;
37 }
38
setOsmTileLevel(int const level)39 void OsmTileClusterRenderer::setOsmTileLevel( int const level )
40 {
41 m_osmTileLevel = level;
42 int const osmMapEdgeLengthTiles = pow( 2, m_osmTileLevel );
43 m_osmMapEdgeLengthPixel = osmMapEdgeLengthTiles * m_osmTileEdgeLengthPixel;
44 qDebug() << "osmTileLevel:" << m_osmTileLevel
45 << "\nosmMapEdgeLengthTiles:" << osmMapEdgeLengthTiles
46 << "\nosmMapEdgeLengthPixel:" << m_osmMapEdgeLengthPixel;
47 }
48
checkAndCreateDirectory(int const tileX) const49 QDir OsmTileClusterRenderer::checkAndCreateDirectory( int const tileX ) const
50 {
51 QDir const tileDirectory( m_osmBaseDirectory.path() + QString("/%1/%2").arg( m_osmTileLevel ).arg( tileX ));
52 if ( !tileDirectory.exists() ) {
53 bool const created = tileDirectory.mkpath( tileDirectory.path() );
54 if ( !created ) {
55 // maybe it was created in the meantime by a different thread, then it should be there now
56 if ( !tileDirectory.exists() )
57 qFatal("Unable to create directory '%s'.", tileDirectory.path().toStdString().c_str() );
58 }
59 }
60 return tileDirectory;
61 }
62
initMapSources()63 void OsmTileClusterRenderer::initMapSources()
64 {
65 QVector<ReadOnlyMapDefinition>::const_iterator pos = m_mapSourceDefinitions.constBegin();
66 QVector<ReadOnlyMapDefinition>::const_iterator const end = m_mapSourceDefinitions.constEnd();
67 for (; pos != end; ++pos )
68 {
69 ReadOnlyMapImage * const mapImage = (*pos).createReadOnlyMap();
70 if ( !mapImage )
71 qFatal("Invalid map source definition.");
72 m_mapSources.push_back( mapImage );
73 }
74 m_mapSourceCount = m_mapSources.count();
75 }
76
renderOsmTileCluster(int const clusterX,int const clusterY)77 void OsmTileClusterRenderer::renderOsmTileCluster( int const clusterX, int const clusterY )
78 {
79 qDebug() << objectName() << "rendering clusterX:" << clusterX << ", clusterY:" << clusterY;
80 int tilesRenderedCount = 0;
81 QTime t;
82 t.start();
83 int const tileX1 = clusterX * m_clusterEdgeLengthTiles;
84 int const tileX2 = tileX1 + m_clusterEdgeLengthTiles;
85 int const tileY1 = clusterY * m_clusterEdgeLengthTiles;
86 int const tileY2 = tileY1 + m_clusterEdgeLengthTiles;
87
88 for ( int tileX = tileX1; tileX < tileX2; ++tileX ) {
89 QDir const tileDirectory = checkAndCreateDirectory( tileX );
90 for ( int tileY = tileY1; tileY < tileY2; ++tileY ) {
91 QImage const osmTile = renderOsmTile( tileX, tileY );
92
93 // hack
94 if ( osmTile.isNull() )
95 continue;
96
97 QString const filename = tileDirectory.path() + QString( "/%1.png" ).arg( tileY );
98 bool const saved = osmTile.save( filename );
99 if ( saved )
100 ++tilesRenderedCount;
101 else
102 qFatal("Unable to save tile '%s'.", filename.toStdString().c_str() );
103 }
104 }
105 int const durationMs = t.elapsed();
106 qDebug() << objectName() << "clusterX:" <<clusterX << ", clusterY:" << clusterY
107 << "rendered:" << tilesRenderedCount << "tiles in" << durationMs << "ms =>"
108 << static_cast<double>( tilesRenderedCount ) * 1000.0 / static_cast<double>( durationMs ) << "tiles/s";
109 emit clusterRendered( this );
110 }
111
renderOsmTile(int const tileX,int const tileY)112 QImage OsmTileClusterRenderer::renderOsmTile( int const tileX, int const tileY )
113 {
114 //qDebug() << objectName() << "renderOsmTile tileX:" << tileX << ", tileY:" << tileY;
115 int const basePixelX = tileX * m_osmTileEdgeLengthPixel;
116 int const basePixelY = tileY * m_osmTileEdgeLengthPixel;
117
118 QSize const tileSize( m_osmTileEdgeLengthPixel, m_osmTileEdgeLengthPixel );
119 QImage tile( tileSize, QImage::Format_ARGB32 );
120 bool tileEmpty = true;
121
122 for ( int y = 0; y < m_osmTileEdgeLengthPixel; ++y ) {
123 int const pixelY = basePixelY + y;
124 double const latRad = osmPixelYtoLatRad( pixelY );
125
126 for ( int x = 0; x < m_osmTileEdgeLengthPixel; ++x ) {
127 int const pixelX = basePixelX + x;
128 double const lonRad = osmPixelXtoLonRad( pixelX );
129
130 QRgb color = m_emptyPixel;
131 for (int i = 0; i < m_mapSourceCount; ++i)
132 {
133 color = m_mapSources[i]->pixel( lonRad, latRad );
134 if ( color != m_emptyPixel ) {
135 tileEmpty = false;
136 break;
137 }
138 }
139
140 tile.setPixel( x, y, color );
141 }
142 }
143 return tileEmpty ? QImage() : tile;
144 }
145
osmPixelXtoLonRad(int const pixelX) const146 inline double OsmTileClusterRenderer::osmPixelXtoLonRad( int const pixelX ) const
147 {
148 double const pixelXd = static_cast<double>( pixelX );
149 double const osmMapEdgeLengthPixeld = static_cast<double>( m_osmMapEdgeLengthPixel );
150 return pixelXd * 2.0 * M_PI / osmMapEdgeLengthPixeld - M_PI;
151 }
152
osmPixelYtoLatRad(int const pixelY) const153 inline double OsmTileClusterRenderer::osmPixelYtoLatRad( int const pixelY ) const
154 {
155 double const pixelYd = static_cast<double>( pixelY );
156 double const osmMapEdgeLengthPixeld = static_cast<double>( m_osmMapEdgeLengthPixel );
157 return -atan( sinh(( pixelYd - 0.5 * osmMapEdgeLengthPixeld ) * 2.0 * M_PI / osmMapEdgeLengthPixeld ));
158 }
159
160 #include "moc_OsmTileClusterRenderer.cpp"
161