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
8 Ville Tiensuu - ville.tiensuu@ixonos.com
10 Situare is free software; you can redistribute it and/or
11 modify it under the terms of the GNU General Public License
12 version 2 as published by the Free Software Foundation.
14 Situare is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with Situare; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
25 #include <QtAlgorithms>
28 #include <QStringList>
31 #include <QHashIterator>
35 #include "frienditemshandler.h"
36 #include "gpslocationitem.h"
37 #include "mapcommon.h"
38 #include "mapfetcher.h"
41 #include "ownlocationitem.h"
43 #include "mapengine.h"
44 #include "network/networkaccessmanager.h"
46 MapEngine::MapEngine(QObject *parent)
48 m_autoCenteringEnabled(false),
50 m_zoomLevel(DEFAULT_ZOOM_LEVEL),
51 m_centerTile(QPoint(UNDEFINED, UNDEFINED)),
52 m_lastManualPosition(QPoint(0, 0)),
53 m_viewSize(QSize(DEFAULT_SCREEN_WIDTH, DEFAULT_SCREEN_HEIGHT))
55 qDebug() << __PRETTY_FUNCTION__;
57 m_mapScene = new MapScene(this);
59 m_mapFetcher = new MapFetcher(NetworkAccessManager::instance(), this);
60 connect(this, SIGNAL(fetchImage(int, int, int)),
61 m_mapFetcher, SLOT(enqueueFetchMapImage(int, int, int)));
62 connect(m_mapFetcher, SIGNAL(mapImageReceived(int, int, int, QPixmap)),
63 this, SLOT(mapImageReceived(int, int, int, QPixmap)));
64 connect(m_mapFetcher, SIGNAL(error(QString)),
65 this, SIGNAL(error(QString)));
67 m_ownLocation = new OwnLocationItem();
68 m_ownLocation->hide(); // hide until first location info is received
69 m_mapScene->addItem(m_ownLocation);
71 m_gpsLocationItem = new GPSLocationItem();
72 m_mapScene->addItem(m_gpsLocationItem);
74 m_friendItemsHandler = new FriendItemsHandler(m_mapScene, this);
75 connect(this, SIGNAL(zoomLevelChanged(int)),
76 m_friendItemsHandler, SLOT(refactorFriendItems(int)));
78 connect(this, SIGNAL(friendsLocationsReady(QList<User*>&)),
79 m_friendItemsHandler, SLOT(friendListUpdated(QList<User*>&)));
81 connect(m_friendItemsHandler, SIGNAL(locationItemClicked(QList<QString>)),
82 this, SIGNAL(locationItemClicked(QList<QString>)));
85 MapEngine::~MapEngine()
87 qDebug() << __PRETTY_FUNCTION__;
89 QSettings settings(DIRECTORY_NAME, FILE_NAME);
90 settings.setValue(MAP_LAST_POSITION,
91 convertSceneCoordinateToLatLon(m_zoomLevel, m_sceneCoordinate));
92 settings.setValue(MAP_LAST_ZOOMLEVEL, m_zoomLevel);
95 QRect MapEngine::calculateTileGrid(QPoint sceneCoordinate)
97 qDebug() << __PRETTY_FUNCTION__;
99 QPoint tileCoordinate = convertSceneCoordinateToTileNumber(m_zoomLevel, sceneCoordinate);
100 int gridWidth = (m_viewSize.width() / TILE_SIZE_X + 1) + (GRID_PADDING * 2);
101 int gridHeight = (m_viewSize.height() / TILE_SIZE_Y + 1) + (GRID_PADDING * 2);
102 int topLeftX = tileCoordinate.x() - (gridWidth / 2);
103 int topLeftY = tileCoordinate.y() - (gridHeight / 2);
105 m_mapFetcher->setDownloadQueueSize(gridWidth * gridHeight);
107 return QRect(topLeftX, topLeftY, gridWidth, gridHeight);
110 QPointF MapEngine::centerGeoCoordinate()
112 qDebug() << __PRETTY_FUNCTION__;
114 return convertSceneCoordinateToLatLon(m_zoomLevel, m_sceneCoordinate);
117 QPoint MapEngine::convertLatLonToSceneCoordinate(QPointF latLonCoordinate)
119 qDebug() << __PRETTY_FUNCTION__;
121 qreal longitude = latLonCoordinate.x();
122 qreal latitude = latLonCoordinate.y();
124 if ((longitude > MAX_LONGITUDE) || (longitude < MIN_LONGITUDE))
125 return QPoint(UNDEFINED, UNDEFINED);
126 if ((latitude > MAX_LATITUDE) || (latitude < MIN_LATITUDE))
127 return QPoint(UNDEFINED, UNDEFINED);
129 qreal z = static_cast<qreal>(1 << MAX_MAP_ZOOM_LEVEL);
131 qreal x = static_cast<qreal>((longitude + 180.0) / 360.0);
132 qreal y = static_cast<qreal>((1.0 - log(tan(latitude * M_PI / 180.0) + 1.0
133 / cos(latitude * M_PI / 180.0)) / M_PI) / 2.0);
135 return QPointF(x * z * TILE_SIZE_X, y * z * TILE_SIZE_Y).toPoint();
138 QPointF MapEngine::convertSceneCoordinateToLatLon(int zoomLevel, QPoint sceneCoordinate)
140 qDebug() << __PRETTY_FUNCTION__;
142 double tileFactor = 1 << (MAX_MAP_ZOOM_LEVEL - zoomLevel);
143 double xFactor = (sceneCoordinate.x() / (TILE_SIZE_X*tileFactor));
144 double yFactor = (sceneCoordinate.y() / (TILE_SIZE_Y*tileFactor));
146 tileFactor = 1 << zoomLevel;
147 double longitude = xFactor / tileFactor * 360.0 - 180;
149 double n = M_PI - 2.0 * M_PI * yFactor / tileFactor;
150 double latitude = 180.0 / M_PI * atan(0.5 * (exp(n) - exp(-n)));
152 return QPointF(longitude, latitude);
155 QPoint MapEngine::convertSceneCoordinateToTileNumber(int zoomLevel, QPoint sceneCoordinate)
157 qDebug() << __PRETTY_FUNCTION__;
159 int pow = 1 << (MAX_MAP_ZOOM_LEVEL - zoomLevel);
160 int x = static_cast<int>(sceneCoordinate.x() / (TILE_SIZE_X * pow));
161 int y = static_cast<int>(sceneCoordinate.y() / (TILE_SIZE_Y * pow));
166 QPoint MapEngine::convertTileNumberToSceneCoordinate(int zoomLevel, QPoint tileNumber)
168 qDebug() << __PRETTY_FUNCTION__;
170 int pow = 1 << (MAX_MAP_ZOOM_LEVEL - zoomLevel);
171 int x = tileNumber.x() * TILE_SIZE_X * pow;
172 int y = tileNumber.y() * TILE_SIZE_Y * pow;
177 bool MapEngine::disableAutoCentering(QPoint sceneCoordinate)
179 if (isAutoCenteringEnabled()) {
180 int zoomFactor = (1 << (MAX_MAP_ZOOM_LEVEL - m_zoomLevel));
182 QPoint oldPixelValue = QPoint(m_lastManualPosition.x() / zoomFactor,
183 m_lastManualPosition.y() / zoomFactor);
185 QPoint newPixelValue = QPoint(sceneCoordinate.x() / zoomFactor,
186 sceneCoordinate.y() / zoomFactor);
188 if ((abs(oldPixelValue.x() - newPixelValue.x()) > AUTO_CENTERING_DISABLE_DISTANCE) ||
189 (abs(oldPixelValue.y() - newPixelValue.y()) > AUTO_CENTERING_DISABLE_DISTANCE))
196 void MapEngine::getTiles(QPoint sceneCoordinate)
198 qDebug() << __PRETTY_FUNCTION__;
200 m_viewTilesGrid = calculateTileGrid(sceneCoordinate);
201 updateViewTilesSceneRect();
203 int topLeftX = m_viewTilesGrid.topLeft().x();
204 int topLeftY = m_viewTilesGrid.topLeft().y();
205 int bottomRightX = m_viewTilesGrid.bottomRight().x();
206 int bottomRightY = m_viewTilesGrid.bottomRight().y();
208 int tileMaxVal = tileMaxValue(m_zoomLevel);
210 for (int x = topLeftX; x <= bottomRightX; ++x) {
211 for (int y = topLeftY; y <= bottomRightY; ++y) {
218 else if (tileX > tileMaxVal)
223 else if (tileY > tileMaxVal)
226 if (!m_mapScene->isTileInScene(tilePath(m_zoomLevel, tileX, tileY)))
227 emit fetchImage(m_zoomLevel, tileX, tileY);
232 void MapEngine::gpsPositionUpdate(QPointF position, qreal accuracy)
234 qDebug() << __PRETTY_FUNCTION__;
236 m_gpsLocationItem->updatePosition(convertLatLonToSceneCoordinate(position), accuracy);
238 if (m_autoCenteringEnabled)
239 setViewLocation(position);
242 void MapEngine::init()
244 qDebug() << __PRETTY_FUNCTION__;
246 QPointF startLocation;
247 QSettings settings(DIRECTORY_NAME, FILE_NAME);
249 if (settings.value(MAP_LAST_POSITION, ERROR_VALUE_NOT_FOUND_ON_SETTINGS).toString()
250 == ERROR_VALUE_NOT_FOUND_ON_SETTINGS || settings.value(MAP_LAST_ZOOMLEVEL,
251 ERROR_VALUE_NOT_FOUND_ON_SETTINGS).toString() == ERROR_VALUE_NOT_FOUND_ON_SETTINGS) {
253 startLocation = QPointF(DEFAULT_LONGITUDE, DEFAULT_LATITUDE);
254 m_zoomLevel = DEFAULT_START_ZOOM_LEVEL;
256 m_zoomLevel = settings.value(MAP_LAST_ZOOMLEVEL, ERROR_VALUE_NOT_FOUND_ON_SETTINGS).toInt();
257 startLocation = settings.value(MAP_LAST_POSITION,
258 ERROR_VALUE_NOT_FOUND_ON_SETTINGS).toPointF();
261 emit zoomLevelChanged(m_zoomLevel);
262 setViewLocation(QPointF(startLocation.x(), startLocation.y()));
265 bool MapEngine::isAutoCenteringEnabled()
267 return m_autoCenteringEnabled;
270 bool MapEngine::isCenterTileChanged(QPoint sceneCoordinate)
272 qDebug() << __PRETTY_FUNCTION__;
274 QPoint centerTile = convertSceneCoordinateToTileNumber(m_zoomLevel, sceneCoordinate);
275 QPoint temp = m_centerTile;
276 m_centerTile = centerTile;
278 return (centerTile != temp);
281 qreal MapEngine::sceneResolution()
283 qDebug() << __PRETTY_FUNCTION__;
285 const int SHIFT = 200;
286 const int KM_TO_M = 1000;
287 qreal scale = (1 << (MAX_MAP_ZOOM_LEVEL - m_zoomLevel));
288 QPointF centerCoordinate = centerGeoCoordinate();
289 QPoint shiftedSceneCoordinate = QPoint(m_sceneCoordinate.x() + SHIFT*scale
290 , m_sceneCoordinate.y());
291 QPointF shiftedCoordinate = convertSceneCoordinateToLatLon(m_zoomLevel, shiftedSceneCoordinate);
292 qreal dist = greatCircleDistance(centerCoordinate, shiftedCoordinate) * KM_TO_M;
293 return (dist / SHIFT);
296 void MapEngine::mapImageReceived(int zoomLevel, int x, int y, const QPixmap &image)
298 qDebug() << __PRETTY_FUNCTION__;
300 QString hashKey = tilePath(zoomLevel, x, y);
301 if (!m_mapScene->isTileInScene(hashKey)) {
303 MapTile *mapTile = new MapTile();
304 mapTile->setZoomLevel(zoomLevel, m_zoomLevel);
305 mapTile->setTileNumber(QPoint(x, y));
306 mapTile->setPixmap(image);
308 m_mapScene->addTile(mapTile, hashKey);
310 m_mapScene->enqueueRemoveStackedTiles(mapTile);
314 qreal MapEngine::greatCircleDistance(QPointF firstLocation, QPointF secondLocation)
316 qDebug() << __PRETTY_FUNCTION__;
318 const qreal TORAD = (M_PI/180);
320 qreal dLat = (secondLocation.y() - firstLocation.y())*TORAD;
321 qreal dLon = (secondLocation.x() - firstLocation.x())*TORAD;
322 qreal a = pow(sin(dLat/2),2) + cos(firstLocation.y()*TORAD) * cos(secondLocation.y()*TORAD)
323 * pow(sin(dLon/2),2);
324 qreal c = 2 * atan2(sqrt(a), sqrt(1-a));
326 return (EARTH_RADIUS * c);
329 void MapEngine::receiveOwnLocation(User *user)
331 qDebug() << __PRETTY_FUNCTION__;
334 QPoint newPosition = convertLatLonToSceneCoordinate(user->coordinates());
335 if (m_ownLocation->pos().toPoint() != newPosition) {
336 m_ownLocation->setPos(newPosition);
339 if (!m_ownLocation->isVisible())
340 m_ownLocation->show();
343 m_ownLocation->hide();
347 QGraphicsScene* MapEngine::scene()
349 qDebug() << __PRETTY_FUNCTION__;
354 void MapEngine::setAutoCentering(bool enabled)
356 m_autoCenteringEnabled = enabled;
359 void MapEngine::setGPSEnabled(bool enabled)
361 m_gpsLocationItem->setEnabled(enabled);
364 void MapEngine::setLocation(QPoint sceneCoordinate)
366 qDebug() << __PRETTY_FUNCTION__;
368 if (disableAutoCentering(sceneCoordinate))
369 emit mapScrolledManually();
371 m_sceneCoordinate = sceneCoordinate;
372 emit locationChanged(m_sceneCoordinate);
374 if (isCenterTileChanged(sceneCoordinate)) {
375 getTiles(sceneCoordinate);
376 m_mapScene->removeOutOfViewTiles();
379 emit newMapResolution(sceneResolution());
382 void MapEngine::setZoomLevel(int newZoomLevel)
384 qDebug() << __PRETTY_FUNCTION__;
386 m_zoomLevel = newZoomLevel;
387 emit zoomLevelChanged(m_zoomLevel);
390 void MapEngine::setViewLocation(QPointF latLonCoordinate)
392 qDebug() << __PRETTY_FUNCTION__;
394 QPoint sceneCoordinate = convertLatLonToSceneCoordinate(latLonCoordinate);
396 m_lastManualPosition = sceneCoordinate;
398 setLocation(sceneCoordinate);
401 int MapEngine::tileMaxValue(int zoomLevel)
403 qDebug() << __PRETTY_FUNCTION__;
405 return (1 << zoomLevel) - 1;
408 QString MapEngine::tilePath(int zoomLevel, int x, int y)
410 qDebug() << __PRETTY_FUNCTION__;
412 QString tilePathString(QString::number(zoomLevel) + "/");
413 tilePathString.append(QString::number(x) + "/");
414 tilePathString.append(QString::number(y));
416 return tilePathString;
419 void MapEngine::updateViewTilesSceneRect()
421 qDebug() << __PRETTY_FUNCTION__;
423 const QPoint ONE_TILE = QPoint(1, 1);
424 const QPoint ONE_PIXEL = QPoint(1, 1);
426 QPoint topLeft = convertTileNumberToSceneCoordinate(m_zoomLevel, m_viewTilesGrid.topLeft());
427 // one tile - one pixel is added because returned coordinates are pointing to upper left corner
429 QPoint bottomRight = convertTileNumberToSceneCoordinate(m_zoomLevel,
430 m_viewTilesGrid.bottomRight()
431 + ONE_TILE) - ONE_PIXEL;
433 m_mapScene->viewRectUpdated(QRect(topLeft, bottomRight));
436 void MapEngine::viewResized(const QSize &size)
438 qDebug() << __PRETTY_FUNCTION__;
441 emit locationChanged(m_sceneCoordinate);
442 getTiles(m_sceneCoordinate);
443 m_mapScene->removeOutOfViewTiles();
446 void MapEngine::viewZoomFinished()
448 qDebug() << __PRETTY_FUNCTION__;
452 m_mapScene->removeOutOfViewTiles();
455 if (m_zoomLevel == MAX_MAP_ZOOM_LEVEL)
456 emit maxZoomLevelReached();
457 else if (m_zoomLevel == MIN_VIEW_ZOOM_LEVEL)
458 emit minZoomLevelReached();
460 emit newMapResolution(sceneResolution());
463 void MapEngine::zoomIn()
465 qDebug() << __PRETTY_FUNCTION__;
467 if (m_zoomLevel < MAX_MAP_ZOOM_LEVEL) {
470 emit zoomLevelChanged(m_zoomLevel);
472 m_mapScene->setTilesDrawingLevels(m_zoomLevel);
474 getTiles(m_sceneCoordinate);
478 void MapEngine::zoomOut()
480 qDebug() << __PRETTY_FUNCTION__;
482 if (m_zoomLevel > MIN_VIEW_ZOOM_LEVEL) {
484 emit zoomLevelChanged(m_zoomLevel);
486 m_mapScene->setTilesDrawingLevels(m_zoomLevel);
488 getTiles(m_sceneCoordinate);