2 Situare - A location system for Facebook
3 Copyright (C) 2010 Ixonos Plc. Authors:
5 Sami Rämö - sami.ramo@ixonos.com
6 Jussi Laitinen - jussi.laitinen@ixonos.com
7 Pekka Nissinen - pekka.nissinen@ixonos.com
9 Situare is free software; you can redistribute it and/or
10 modify it under the terms of the GNU General Public License
11 version 2 as published by the Free Software Foundation.
13 Situare is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with Situare; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
26 #include <QStringList>
29 #include <QHashIterator>
32 #include "mapengine.h"
35 MapEngine::MapEngine(QObject *parent)
37 , m_centerTile(QPoint(UNDEFINED, UNDEFINED))
38 , m_viewSize(QSize(DEFAULT_SCREEN_WIDTH, DEFAULT_SCREEN_HEIGHT))
39 , m_zoomLevel(DEFAULT_ZOOM_LEVEL)
41 m_mapScene = new MapScene(this);
43 m_mapFetcher = new MapFetcher(new QNetworkAccessManager(this), this);
44 connect(this, SIGNAL(fetchImage(QUrl)), m_mapFetcher, SLOT(fetchMapImage(QUrl)));
45 connect(m_mapFetcher, SIGNAL(mapImageReceived(QUrl,QPixmap)), this,
46 SLOT(mapImageReceived(QUrl, QPixmap)));
48 m_mapZoomPanel = new MapZoomPanel(NULL, MAP_ZOOM_PANEL_POSITION_X, MAP_ZOOM_PANEL_POSITION_Y);
49 m_mapScene->addItem(m_mapZoomPanel);
50 connect(m_mapZoomPanel, SIGNAL(zoomInPressed()), this, SLOT(zoomIn()));
51 connect(m_mapZoomPanel, SIGNAL(zoomOutPressed()), this, SLOT(zoomOut()));
53 m_ownLocation = new OwnLocationItem();
54 m_mapScene->addItem(m_ownLocation);
57 void MapEngine::init()
59 emit zoomLevelChanged(m_zoomLevel);
60 setViewLocation(QPointF(DEFAULT_LONGITUDE, DEFAULT_LATITUDE));
63 void MapEngine::setViewLocation(QPointF latLonCoordinate)
65 qDebug() << __PRETTY_FUNCTION__;
66 setLocation(convertLatLonToSceneCoordinate(latLonCoordinate));
69 QUrl MapEngine::buildURL(int zoomLevel, QPoint tileNumbers)
71 QString url = QString("http://tile.openstreetmap.org/mapnik/%1/%2/%3.png")
72 .arg(zoomLevel).arg(tileNumbers.x()).arg(tileNumbers.y());
77 void MapEngine::parseURL(const QUrl &url, int &zoom, int &x, int &y)
79 QString path = url.path();
80 QStringList pathParts = path.split("/", QString::SkipEmptyParts);
82 int size = pathParts.size();
85 zoom = (pathParts.at(size-3)).toInt();
86 x = (pathParts.at(size-2)).toInt();
87 QString yString = pathParts.at(size-1);
93 void MapEngine::mapImageReceived(const QUrl &url, const QPixmap &pixmap)
95 //qDebug() << __PRETTY_FUNCTION__;
101 parseURL(url, zoom, x, y);
102 QString hashKey = tilePath(zoom, x, y);
103 if (!m_mapScene->isTileInScene(hashKey)) {
105 MapTile *mapTile = new MapTile();
106 mapTile->setZoomLevel(zoom);
107 mapTile->setTileNumber(QPoint(x, y));
108 mapTile->setPixmap(pixmap);
110 m_mapScene->addTile(mapTile, hashKey);
112 m_mapScene->removeStackedTiles(mapTile, viewRect());
116 QGraphicsScene* MapEngine::scene()
118 return dynamic_cast<QGraphicsScene *>(m_mapScene);
121 int MapEngine::tileMaxValue(int zoomLevel)
123 return (1 << zoomLevel) - 1;
126 QRect MapEngine::calculateTileGrid(QPoint sceneCoordinate)
128 QPoint tileCoordinate = convertSceneCoordinateToTileNumber(m_zoomLevel, sceneCoordinate);
129 int gridWidth = (m_viewSize.width()/TILE_SIZE_X + 1) + (GRID_PADDING*2);
130 int gridHeight = (m_viewSize.height()/TILE_SIZE_Y + 1) + (GRID_PADDING*2);
131 int topLeftX = tileCoordinate.x() - (gridWidth/2);
132 int topLeftY = tileCoordinate.y() - (gridHeight/2);
134 return QRect(topLeftX, topLeftY, gridWidth, gridHeight);
137 void MapEngine::alignImmovableItems(QPoint viewTopLeft)
139 m_mapZoomPanel->setPos(viewTopLeft);
141 // qDebug() << __PRETTY_FUNCTION__ << "viewTopLeft:" << viewTopLeft;
144 void MapEngine::setLocation(QPoint sceneCoordinate)
146 // qDebug() << __PRETTY_FUNCTION__;
148 m_sceneCoordinate = sceneCoordinate;
149 emit locationChanged(m_sceneCoordinate);
151 if (isCenterTileChanged(sceneCoordinate)) {
152 getTiles(sceneCoordinate);
153 m_mapScene->removeOutOfViewTiles(viewRect());
157 bool MapEngine::isCenterTileChanged(QPoint sceneCoordinate)
159 QPoint centerTile = convertSceneCoordinateToTileNumber(m_zoomLevel, sceneCoordinate);
160 QPoint temp = m_centerTile;
161 m_centerTile = centerTile;
163 return (centerTile != temp);
166 void MapEngine::getTiles(QPoint sceneCoordinate)
168 // qDebug() << __PRETTY_FUNCTION__;
170 m_viewGrid = calculateTileGrid(sceneCoordinate);
172 int topLeftX = m_viewGrid.topLeft().x();
173 int topLeftY = m_viewGrid.topLeft().y();
174 int bottomRightX = m_viewGrid.bottomRight().x();
175 int bottomRightY = m_viewGrid.bottomRight().y();
177 int tileMaxVal = tileMaxValue(m_zoomLevel);
179 for (int x = topLeftX; x <= bottomRightX; ++x) {
180 for (int y = topLeftY; y <= bottomRightY; ++y) {
187 else if (tileX > tileMaxVal)
192 else if (tileY > tileMaxVal)
195 QUrl url = buildURL(m_zoomLevel, QPoint(tileX, tileY));
197 if (!m_mapScene->isTileInScene(tilePath(m_zoomLevel, tileX, tileY)))
198 emit fetchImage(url);
203 QRect MapEngine::viewRect()
205 QPoint topLeft = convertTileNumberToSceneCoordinate(m_zoomLevel, m_viewGrid.topLeft());
206 QPoint bottomRight = convertTileNumberToSceneCoordinate(m_zoomLevel, m_viewGrid.bottomRight()
208 return QRect(topLeft, bottomRight);
211 void MapEngine::viewResized(const QSize &size)
214 getTiles(m_sceneCoordinate);
215 m_mapScene->removeOutOfViewTiles(viewRect());
218 void MapEngine::viewZoomInFinished()
220 qDebug() << __PRETTY_FUNCTION__;
221 m_mapScene->removeOutOfViewTiles(viewRect());
224 void MapEngine::zoomIn()
226 // qDebug() << __PRETTY_FUNCTION__;
228 if (m_zoomLevel < MAX_MAP_ZOOM_LEVEL) {
230 emit zoomLevelChanged(m_zoomLevel);
232 m_mapScene->setTilesDrawingLevels(m_zoomLevel);
234 getTiles(m_sceneCoordinate);
238 void MapEngine::zoomOut()
240 // qDebug() << __PRETTY_FUNCTION__;
242 if (m_zoomLevel > MIN_MAP_ZOOM_LEVEL) {
244 emit zoomLevelChanged(m_zoomLevel);
246 m_mapScene->setTilesDrawingLevels(m_zoomLevel);
248 getTiles(m_sceneCoordinate);
252 QString MapEngine::tilePath(int zoomLevel, int x, int y)
254 QString tilePathString(QString::number(zoomLevel) + "/");
255 tilePathString.append(QString::number(x) + "/");
256 tilePathString.append(QString::number(y));
258 return tilePathString;
261 QPoint MapEngine::convertSceneCoordinateToTileNumber(int zoomLevel, QPoint sceneCoordinate)
263 int pow = 1 << (MAX_MAP_ZOOM_LEVEL - zoomLevel);
264 int x = static_cast<int>(sceneCoordinate.x() / (TILE_SIZE_X*pow));
265 int y = static_cast<int>(sceneCoordinate.y() / (TILE_SIZE_Y*pow));
270 QPoint MapEngine::convertTileNumberToSceneCoordinate(int zoomLevel, QPoint tileNumber)
272 int pow = 1 << (MAX_MAP_ZOOM_LEVEL - zoomLevel);
273 int x = tileNumber.x() * TILE_SIZE_X * pow;
274 int y = tileNumber.y() * TILE_SIZE_Y * pow;
279 QPoint MapEngine::convertLatLonToSceneCoordinate(QPointF latLonCoordinate)
281 // qDebug() << __PRETTY_FUNCTION__;
283 qreal longitude = latLonCoordinate.x();
284 qreal latitude = latLonCoordinate.y();
286 if ((longitude > MAX_LONGITUDE) || (longitude < MIN_LONGITUDE))
287 return QPoint(UNDEFINED, UNDEFINED);
288 if ((latitude > MAX_LATITUDE) || (latitude < MIN_LATITUDE))
289 return QPoint(UNDEFINED, UNDEFINED);
291 qreal z = static_cast<qreal>(1 << MAX_MAP_ZOOM_LEVEL);
293 qreal x = static_cast<qreal>((longitude + 180.0) / 360.0);
294 qreal y = static_cast<qreal>((1.0 - log(tan(latitude * M_PI / 180.0) + 1.0
295 / cos(latitude * M_PI / 180.0)) / M_PI) / 2.0);
297 return QPointF(x*z*TILE_SIZE_X, y*z*TILE_SIZE_Y).toPoint();