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 "network/networkaccessmanager.h"
42 #include "ownlocationitem.h"
43 #include "user/user.h"
45 #include "mapengine.h"
47 MapEngine::MapEngine(QObject *parent)
49 m_autoCenteringEnabled(false),
51 m_zoomLevel(DEFAULT_ZOOM_LEVEL),
52 m_centerTile(QPoint(UNDEFINED, UNDEFINED)),
53 m_lastManualPosition(QPoint(0, 0)),
54 m_tilesGridSize(QSize(0, 0)),
55 m_viewSize(QSize(DEFAULT_SCREEN_WIDTH, DEFAULT_SCREEN_HEIGHT))
57 qDebug() << __PRETTY_FUNCTION__;
59 m_mapScene = new MapScene(this);
61 m_mapFetcher = new MapFetcher(NetworkAccessManager::instance(), this);
62 connect(this, SIGNAL(fetchImage(int, int, int)),
63 m_mapFetcher, SLOT(enqueueFetchMapImage(int, int, int)));
64 connect(m_mapFetcher, SIGNAL(mapImageReceived(int, int, int, QPixmap)),
65 this, SLOT(mapImageReceived(int, int, int, QPixmap)));
66 connect(m_mapFetcher, SIGNAL(error(int)),
67 this, SIGNAL(error(int)));
69 m_ownLocation = new OwnLocationItem();
70 m_ownLocation->hide(); // hide until first location info is received
71 m_mapScene->addItem(m_ownLocation);
73 m_gpsLocationItem = new GPSLocationItem();
74 m_mapScene->addItem(m_gpsLocationItem);
76 m_friendItemsHandler = new FriendItemsHandler(m_mapScene, this);
77 connect(this, SIGNAL(zoomLevelChanged(int)),
78 m_friendItemsHandler, SLOT(refactorFriendItems(int)));
80 connect(this, SIGNAL(friendsLocationsReady(QList<User*>&)),
81 m_friendItemsHandler, SLOT(friendListUpdated(QList<User*>&)));
83 connect(this, SIGNAL(friendsLocationsReady(QList<User*>&)),
84 this, SLOT(friendsPositionsUpdated()));
86 connect(m_friendItemsHandler, SIGNAL(locationItemClicked(QList<QString>)),
87 this, SIGNAL(locationItemClicked(QList<QString>)));
90 MapEngine::~MapEngine()
92 qDebug() << __PRETTY_FUNCTION__;
94 QSettings settings(DIRECTORY_NAME, FILE_NAME);
95 settings.setValue(MAP_LAST_POSITION,
96 convertSceneCoordinateToLatLon(m_zoomLevel, m_sceneCoordinate));
97 settings.setValue(MAP_LAST_ZOOMLEVEL, m_zoomLevel);
100 QRect MapEngine::calculateTileGrid(QPoint sceneCoordinate)
102 qDebug() << __PRETTY_FUNCTION__;
104 QPoint tileCoordinate = convertSceneCoordinateToTileNumber(m_zoomLevel, sceneCoordinate);
107 topLeft.setX(tileCoordinate.x() - (m_tilesGridSize.width() / 2));
108 topLeft.setY(tileCoordinate.y() - (m_tilesGridSize.height() / 2));
110 return QRect(topLeft, m_tilesGridSize);
113 QPointF MapEngine::centerGeoCoordinate()
115 qDebug() << __PRETTY_FUNCTION__;
117 return convertSceneCoordinateToLatLon(m_zoomLevel, m_sceneCoordinate);
120 QPoint MapEngine::convertLatLonToSceneCoordinate(QPointF latLonCoordinate)
122 qDebug() << __PRETTY_FUNCTION__;
124 qreal longitude = latLonCoordinate.x();
125 qreal latitude = latLonCoordinate.y();
127 if ((longitude > MAX_LONGITUDE) || (longitude < MIN_LONGITUDE))
128 return QPoint(UNDEFINED, UNDEFINED);
129 if ((latitude > MAX_LATITUDE) || (latitude < MIN_LATITUDE))
130 return QPoint(UNDEFINED, UNDEFINED);
132 qreal z = static_cast<qreal>(1 << MAX_MAP_ZOOM_LEVEL);
134 qreal x = static_cast<qreal>((longitude + 180.0) / 360.0);
135 qreal y = static_cast<qreal>((1.0 - log(tan(latitude * M_PI / 180.0) + 1.0
136 / cos(latitude * M_PI / 180.0)) / M_PI) / 2.0);
138 return QPointF(x * z * TILE_SIZE_X, y * z * TILE_SIZE_Y).toPoint();
141 QPointF MapEngine::convertSceneCoordinateToLatLon(int zoomLevel, QPoint sceneCoordinate)
143 qDebug() << __PRETTY_FUNCTION__;
145 double tileFactor = 1 << (MAX_MAP_ZOOM_LEVEL - zoomLevel);
146 double xFactor = (sceneCoordinate.x() / (TILE_SIZE_X*tileFactor));
147 double yFactor = (sceneCoordinate.y() / (TILE_SIZE_Y*tileFactor));
149 tileFactor = 1 << zoomLevel;
150 double longitude = xFactor / tileFactor * 360.0 - 180;
152 double n = M_PI - 2.0 * M_PI * yFactor / tileFactor;
153 double latitude = 180.0 / M_PI * atan(0.5 * (exp(n) - exp(-n)));
155 return QPointF(longitude, latitude);
158 QPoint MapEngine::convertSceneCoordinateToTileNumber(int zoomLevel, QPoint sceneCoordinate)
160 qDebug() << __PRETTY_FUNCTION__;
162 int pow = 1 << (MAX_MAP_ZOOM_LEVEL - zoomLevel);
163 int x = static_cast<int>(sceneCoordinate.x() / (TILE_SIZE_X * pow));
164 int y = static_cast<int>(sceneCoordinate.y() / (TILE_SIZE_Y * pow));
169 QPoint MapEngine::convertTileNumberToSceneCoordinate(int zoomLevel, QPoint tileNumber)
171 qDebug() << __PRETTY_FUNCTION__;
173 int pow = 1 << (MAX_MAP_ZOOM_LEVEL - zoomLevel);
174 int x = tileNumber.x() * TILE_SIZE_X * pow;
175 int y = tileNumber.y() * TILE_SIZE_Y * pow;
180 bool MapEngine::disableAutoCentering(QPoint sceneCoordinate)
182 if (isAutoCenteringEnabled()) {
183 int zoomFactor = (1 << (MAX_MAP_ZOOM_LEVEL - m_zoomLevel));
185 QPoint oldPixelValue = QPoint(m_lastManualPosition.x() / zoomFactor,
186 m_lastManualPosition.y() / zoomFactor);
188 QPoint newPixelValue = QPoint(sceneCoordinate.x() / zoomFactor,
189 sceneCoordinate.y() / zoomFactor);
191 if ((abs(oldPixelValue.x() - newPixelValue.x()) > AUTO_CENTERING_DISABLE_DISTANCE) ||
192 (abs(oldPixelValue.y() - newPixelValue.y()) > AUTO_CENTERING_DISABLE_DISTANCE))
199 void MapEngine::friendsPositionsUpdated()
201 qDebug() << __PRETTY_FUNCTION__;
203 m_mapScene->spanItems(m_zoomLevel, m_sceneCoordinate, m_viewSize);
206 void MapEngine::getTiles(QPoint sceneCoordinate)
208 qDebug() << __PRETTY_FUNCTION__;
210 m_viewTilesGrid = calculateTileGrid(sceneCoordinate);
211 updateViewTilesSceneRect();
212 m_mapScene->setTilesGrid(m_viewTilesGrid);
214 int topLeftX = m_viewTilesGrid.topLeft().x();
215 int topLeftY = m_viewTilesGrid.topLeft().y();
216 int bottomRightX = m_viewTilesGrid.bottomRight().x();
217 int bottomRightY = m_viewTilesGrid.bottomRight().y();
219 int tileMaxVal = tileMaxValue(m_zoomLevel);
221 for (int x = topLeftX; x <= bottomRightX; ++x) {
222 for (int y = topLeftY; y <= bottomRightY; ++y) {
224 // map doesn't span in vertical direction
225 if (y < 0 || y > tileMaxVal)
228 if (!m_mapScene->tileInScene(tilePath(m_zoomLevel, x, y)))
229 emit fetchImage(m_zoomLevel, normalize(x, 0, tileMaxVal), y);
234 void MapEngine::gpsPositionUpdate(QPointF position, qreal accuracy)
236 qDebug() << __PRETTY_FUNCTION__;
238 m_gpsLocationItem->updatePosition(convertLatLonToSceneCoordinate(position), accuracy);
239 m_mapScene->spanItems(m_zoomLevel, m_sceneCoordinate, m_viewSize);
241 if (m_autoCenteringEnabled)
242 setViewLocation(position);
245 qreal MapEngine::greatCircleDistance(QPointF firstLocation, QPointF secondLocation)
247 qDebug() << __PRETTY_FUNCTION__;
249 const qreal TORAD = (M_PI/180);
251 qreal dLat = (secondLocation.y() - firstLocation.y())*TORAD;
252 qreal dLon = (secondLocation.x() - firstLocation.x())*TORAD;
253 qreal a = pow(sin(dLat/2),2) + cos(firstLocation.y()*TORAD) * cos(secondLocation.y()*TORAD)
254 * pow(sin(dLon/2),2);
255 qreal c = 2 * atan2(sqrt(a), sqrt(1-a));
257 return (EARTH_RADIUS * c);
260 void MapEngine::init()
262 qDebug() << __PRETTY_FUNCTION__;
264 QPointF startLocation;
265 QSettings settings(DIRECTORY_NAME, FILE_NAME);
267 if (settings.value(MAP_LAST_POSITION, ERROR_VALUE_NOT_FOUND_ON_SETTINGS).toString()
268 == ERROR_VALUE_NOT_FOUND_ON_SETTINGS || settings.value(MAP_LAST_ZOOMLEVEL,
269 ERROR_VALUE_NOT_FOUND_ON_SETTINGS).toString() == ERROR_VALUE_NOT_FOUND_ON_SETTINGS) {
271 startLocation = QPointF(DEFAULT_LONGITUDE, DEFAULT_LATITUDE);
272 m_zoomLevel = qBound(MIN_VIEW_ZOOM_LEVEL, DEFAULT_START_ZOOM_LEVEL, MAX_MAP_ZOOM_LEVEL);
274 m_zoomLevel = settings.value(MAP_LAST_ZOOMLEVEL, ERROR_VALUE_NOT_FOUND_ON_SETTINGS).toInt();
275 startLocation = settings.value(MAP_LAST_POSITION,
276 ERROR_VALUE_NOT_FOUND_ON_SETTINGS).toPointF();
279 emit zoomLevelChanged(m_zoomLevel);
280 setViewLocation(QPointF(startLocation.x(), startLocation.y()));
283 bool MapEngine::isAutoCenteringEnabled()
285 return m_autoCenteringEnabled;
288 bool MapEngine::isCenterTileChanged(QPoint sceneCoordinate)
290 qDebug() << __PRETTY_FUNCTION__;
292 QPoint centerTile = convertSceneCoordinateToTileNumber(m_zoomLevel, sceneCoordinate);
293 QPoint temp = m_centerTile;
294 m_centerTile = centerTile;
296 return (centerTile != temp);
299 qreal MapEngine::sceneResolution()
301 qDebug() << __PRETTY_FUNCTION__;
303 const int SHIFT = 200;
304 const int KM_TO_M = 1000;
305 qreal scale = (1 << (MAX_MAP_ZOOM_LEVEL - m_zoomLevel));
306 QPointF centerCoordinate = centerGeoCoordinate();
307 QPoint shiftedSceneCoordinate = QPoint(m_sceneCoordinate.x() + SHIFT*scale
308 , m_sceneCoordinate.y());
309 QPointF shiftedCoordinate = convertSceneCoordinateToLatLon(m_zoomLevel, shiftedSceneCoordinate);
310 qreal dist = greatCircleDistance(centerCoordinate, shiftedCoordinate) * KM_TO_M;
311 return (dist / SHIFT);
314 void MapEngine::mapImageReceived(int zoomLevel, int x, int y, const QPixmap &image)
316 qDebug() << __PRETTY_FUNCTION__;
318 // add normal tile inside the world
319 QPoint tileNumber(x, y);
320 m_mapScene->addTile(zoomLevel, tileNumber, image, m_zoomLevel);
322 // note: add 1 so odd width is rounded up and even is rounded down
323 int tilesGridWidthHalf = (m_viewTilesGrid.width() + 1) / 2;
325 // duplicate to east side? (don't need to duplicate over padding)
326 if (tileNumber.x() < (tilesGridWidthHalf - GRID_PADDING)) {
327 QPoint adjustedTileNumber(tileNumber.x() + tileMaxValue(zoomLevel) + 1, tileNumber.y());
328 m_mapScene->addTile(zoomLevel, adjustedTileNumber, image, m_zoomLevel);
331 // duplicate to west side? (don't need to duplicate over padding)
332 if (tileNumber.x() > (tileMaxValue(zoomLevel) - tilesGridWidthHalf + GRID_PADDING - 1)) {
333 QPoint adjustedTileNumber(tileNumber.x() - tileMaxValue(zoomLevel) - 1, tileNumber.y());
334 m_mapScene->addTile(zoomLevel, adjustedTileNumber, image, m_zoomLevel);
338 int MapEngine::normalize(int value, int min, int max)
340 qDebug() << __PRETTY_FUNCTION__;
341 Q_ASSERT_X(max >= min, "parameters", "max can't be smaller than min");
344 value += max - min + 1;
347 value -= max - min + 1;
352 void MapEngine::receiveOwnLocation(User *user)
354 qDebug() << __PRETTY_FUNCTION__;
357 QPoint newPosition = convertLatLonToSceneCoordinate(user->coordinates());
358 if (m_ownLocation->pos().toPoint() != newPosition) {
359 m_ownLocation->setPos(newPosition);
362 if (!m_ownLocation->isVisible())
363 m_ownLocation->show();
366 m_ownLocation->hide();
369 m_mapScene->spanItems(m_zoomLevel, m_sceneCoordinate, m_viewSize);
372 QGraphicsScene* MapEngine::scene()
374 qDebug() << __PRETTY_FUNCTION__;
379 void MapEngine::setAutoCentering(bool enabled)
381 m_autoCenteringEnabled = enabled;
384 void MapEngine::setGPSEnabled(bool enabled)
386 m_gpsLocationItem->setEnabled(enabled);
389 void MapEngine::setLocation(QPoint sceneCoordinate)
391 qDebug() << __PRETTY_FUNCTION__;
393 // jump to opposite side of the world if world limit is exceeded
394 if (sceneCoordinate.x() < MAP_MIN_PIXEL_X)
395 sceneCoordinate.setX(sceneCoordinate.x() + MAP_PIXELS_X);
396 else if (sceneCoordinate.x() > MAP_MAX_PIXEL_X)
397 sceneCoordinate.setX(sceneCoordinate.x() - MAP_PIXELS_X);
399 if (disableAutoCentering(sceneCoordinate))
400 emit mapScrolledManually();
402 m_sceneCoordinate = sceneCoordinate;
403 emit locationChanged(m_sceneCoordinate);
405 if (isCenterTileChanged(sceneCoordinate)) {
406 getTiles(sceneCoordinate);
407 m_mapScene->removeOutOfViewTiles(m_viewTilesGrid, m_zoomLevel);
410 m_mapScene->spanItems(m_zoomLevel, m_sceneCoordinate, m_viewSize);
411 emit newMapResolution(sceneResolution());
414 void MapEngine::setZoomLevel(int newZoomLevel)
416 qDebug() << __PRETTY_FUNCTION__;
418 m_zoomLevel = newZoomLevel;
422 void MapEngine::setTilesGridSize(const QSize &viewSize)
424 qDebug() << __PRETTY_FUNCTION__;
426 // there must be scrolling reserve of at least half tile added to tile amount
427 // calculated from view size
428 const qreal SCROLLING_RESERVE = 0.5;
430 // converting scene tile to tile number does cause grid centering inaccuracy of one tile
431 const int CENTER_TILE_INACCURACY = 1;
433 int gridWidth = ceil(qreal(viewSize.width()) / TILE_SIZE_X + SCROLLING_RESERVE)
434 + CENTER_TILE_INACCURACY + (GRID_PADDING * 2);
435 int gridHeight = ceil(qreal(viewSize.height()) / TILE_SIZE_Y + SCROLLING_RESERVE)
436 + CENTER_TILE_INACCURACY + (GRID_PADDING * 2);
438 m_mapFetcher->setDownloadQueueSize(gridWidth * gridHeight);
440 m_tilesGridSize.setHeight(gridHeight);
441 m_tilesGridSize.setWidth(gridWidth);
443 qWarning() << __PRETTY_FUNCTION__ << "tiles:" << m_tilesGridSize.width()
444 << "*" << m_tilesGridSize.height()
445 << "=" << m_tilesGridSize.width() * m_tilesGridSize.height();
448 void MapEngine::setViewLocation(QPointF latLonCoordinate)
450 qDebug() << __PRETTY_FUNCTION__;
452 QPoint sceneCoordinate = convertLatLonToSceneCoordinate(latLonCoordinate);
454 m_lastManualPosition = sceneCoordinate;
456 setLocation(sceneCoordinate);
459 int MapEngine::tileMaxValue(int zoomLevel)
461 qDebug() << __PRETTY_FUNCTION__;
463 return (1 << zoomLevel) - 1;
466 QString MapEngine::tilePath(int zoomLevel, int x, int y)
468 qDebug() << __PRETTY_FUNCTION__;
470 QString tilePathString(QString::number(zoomLevel) + "/");
471 tilePathString.append(QString::number(x) + "/");
472 tilePathString.append(QString::number(y));
474 return tilePathString;
477 void MapEngine::updateViewTilesSceneRect()
479 qDebug() << __PRETTY_FUNCTION__;
481 const QPoint ONE_TILE = QPoint(1, 1);
482 const QPoint ONE_PIXEL = QPoint(1, 1);
484 QPoint topLeft = convertTileNumberToSceneCoordinate(m_zoomLevel, m_viewTilesGrid.topLeft());
485 // one tile - one pixel is added because returned coordinates are pointing to upper left corner
487 QPoint bottomRight = convertTileNumberToSceneCoordinate(m_zoomLevel,
488 m_viewTilesGrid.bottomRight()
489 + ONE_TILE) - ONE_PIXEL;
491 m_mapScene->tilesSceneRectUpdated(QRect(topLeft, bottomRight));
494 void MapEngine::viewResized(const QSize &size)
496 qDebug() << __PRETTY_FUNCTION__;
499 setTilesGridSize(m_viewSize);
501 emit locationChanged(m_sceneCoordinate);
502 getTiles(m_sceneCoordinate);
503 m_mapScene->removeOutOfViewTiles(m_viewTilesGrid, m_zoomLevel);
504 m_mapScene->setSceneVerticalOverlap(m_viewSize.height(), m_zoomLevel);
507 void MapEngine::viewZoomFinished()
509 qDebug() << __PRETTY_FUNCTION__;
513 m_mapScene->removeOutOfViewTiles(m_viewTilesGrid, m_zoomLevel);
516 if (m_zoomLevel == MAX_MAP_ZOOM_LEVEL)
517 emit maxZoomLevelReached();
518 else if (m_zoomLevel == MIN_VIEW_ZOOM_LEVEL)
519 emit minZoomLevelReached();
521 m_mapScene->setZoomLevel(m_zoomLevel);
524 void MapEngine::zoomed()
526 emit zoomLevelChanged(m_zoomLevel);
527 m_mapScene->setTilesDrawingLevels(m_zoomLevel);
528 getTiles(m_sceneCoordinate);
529 m_mapScene->setSceneVerticalOverlap(m_viewSize.height(), m_zoomLevel);
530 m_mapScene->spanItems(m_zoomLevel, m_sceneCoordinate, m_viewSize);
531 emit newMapResolution(sceneResolution());
534 void MapEngine::zoomIn()
536 qDebug() << __PRETTY_FUNCTION__;
538 if (m_zoomLevel < MAX_MAP_ZOOM_LEVEL) {
545 void MapEngine::zoomOut()
547 qDebug() << __PRETTY_FUNCTION__;
549 if (m_zoomLevel > MIN_VIEW_ZOOM_LEVEL) {