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))
40 , m_zoomLevel(DEFAULT_ZOOM_LEVEL)
42 m_mapScene = new MapScene(this);
44 m_mapFetcher = new MapFetcher(new QNetworkAccessManager(this), this);
45 connect(this, SIGNAL(fetchImage(QUrl)), m_mapFetcher, SLOT(enqueueFetchMapImage(QUrl)));
46 connect(m_mapFetcher, SIGNAL(mapImageReceived(QUrl,QPixmap)), this,
47 SLOT(mapImageReceived(QUrl, QPixmap)));
49 m_mapZoomPanel = new MapZoomPanel(NULL, MAP_ZOOM_PANEL_POSITION_X, MAP_ZOOM_PANEL_POSITION_Y);
50 m_mapScene->addItem(m_mapZoomPanel);
51 connect(m_mapZoomPanel, SIGNAL(zoomInPressed()), this, SLOT(zoomIn()));
52 connect(m_mapZoomPanel, SIGNAL(zoomOutPressed()), this, SLOT(zoomOut()));
55 void MapEngine::init()
57 emit zoomLevelChanged(m_zoomLevel);
58 setViewLocation(QPointF(DEFAULT_LONGITUDE, DEFAULT_LATITUDE));
61 void MapEngine::setViewLocation(QPointF latLonCoordinate)
63 qDebug() << __PRETTY_FUNCTION__;
64 setLocation(convertLatLonToSceneCoordinate(latLonCoordinate));
67 QUrl MapEngine::buildURL(int zoomLevel, QPoint tileNumbers)
69 QString url = QString("http://tile.openstreetmap.org/mapnik/%1/%2/%3.png")
70 .arg(zoomLevel).arg(tileNumbers.x()).arg(tileNumbers.y());
75 void MapEngine::parseURL(const QUrl &url, int &zoom, int &x, int &y)
77 QString path = url.path();
78 QStringList pathParts = path.split("/", QString::SkipEmptyParts);
80 int size = pathParts.size();
83 zoom = (pathParts.at(size-3)).toInt();
84 x = (pathParts.at(size-2)).toInt();
85 QString yString = pathParts.at(size-1);
91 void MapEngine::mapImageReceived(const QUrl &url, const QPixmap &pixmap)
93 qDebug() << __PRETTY_FUNCTION__;
99 parseURL(url, zoom, x, y);
100 QString hashKey = tilePath(zoom, x, y);
101 if (!m_mapScene->isTileInScene(hashKey)) {
103 MapTile *mapTile = new MapTile();
104 mapTile->setZoomLevel(zoom, m_zoomLevel);
105 mapTile->setTileNumber(QPoint(x, y));
106 mapTile->setPixmap(pixmap);
108 m_mapScene->addTile(mapTile, hashKey);
110 m_mapScene->debugItemsCount();
112 m_mapScene->enqueueRemoveStackedTiles(mapTile);
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 m_mapFetcher->setDownloadQueueSize(gridWidth * gridHeight);
136 return QRect(topLeftX, topLeftY, gridWidth, gridHeight);
139 void MapEngine::alignImmovableItems(QPoint viewTopLeft)
141 m_mapZoomPanel->setPos(viewTopLeft);
143 qDebug() << __PRETTY_FUNCTION__ << "viewTopLeft:" << viewTopLeft;
146 void MapEngine::setLocation(QPoint sceneCoordinate)
148 qDebug() << __PRETTY_FUNCTION__;
150 m_sceneCoordinate = sceneCoordinate;
151 emit locationChanged(m_sceneCoordinate);
153 if (isCenterTileChanged(sceneCoordinate)) {
154 getTiles(sceneCoordinate);
155 m_mapScene->removeOutOfViewTiles();
159 bool MapEngine::isCenterTileChanged(QPoint sceneCoordinate)
161 QPoint centerTile = convertSceneCoordinateToTileNumber(m_zoomLevel, sceneCoordinate);
162 QPoint temp = m_centerTile;
163 m_centerTile = centerTile;
165 return (centerTile != temp);
168 void MapEngine::getTiles(QPoint sceneCoordinate)
170 qDebug() << __PRETTY_FUNCTION__;
172 m_viewTilesGrid = calculateTileGrid(sceneCoordinate);
173 updateViewTilesSceneRect();
175 int topLeftX = m_viewTilesGrid.topLeft().x();
176 int topLeftY = m_viewTilesGrid.topLeft().y();
177 int bottomRightX = m_viewTilesGrid.bottomRight().x();
178 int bottomRightY = m_viewTilesGrid.bottomRight().y();
180 int tileMaxVal = tileMaxValue(m_zoomLevel);
182 for (int x = topLeftX; x <= bottomRightX; ++x) {
183 for (int y = topLeftY; y <= bottomRightY; ++y) {
190 else if (tileX > tileMaxVal)
195 else if (tileY > tileMaxVal)
198 QUrl url = buildURL(m_zoomLevel, QPoint(tileX, tileY));
200 if (!m_mapScene->isTileInScene(tilePath(m_zoomLevel, tileX, tileY)))
201 emit fetchImage(url);
206 void MapEngine::updateViewTilesSceneRect()
208 QPoint topLeft = convertTileNumberToSceneCoordinate(m_zoomLevel, m_viewTilesGrid.topLeft());
209 QPoint bottomRight = convertTileNumberToSceneCoordinate(m_zoomLevel,
210 m_viewTilesGrid.bottomRight()
211 + QPoint(1, 1)) - QPoint(1, 1);
213 m_mapScene->viewRectUpdated(QRect(topLeft, bottomRight));
216 void MapEngine::viewResized(const QSize &size)
219 getTiles(m_sceneCoordinate);
220 m_mapScene->removeOutOfViewTiles();
223 void MapEngine::viewZoomFinished()
225 qDebug() << __PRETTY_FUNCTION__;
229 m_mapScene->removeOutOfViewTiles();
233 void MapEngine::zoomIn()
235 qDebug() << __PRETTY_FUNCTION__;
237 if (m_zoomLevel < MAX_MAP_ZOOM_LEVEL) {
240 emit zoomLevelChanged(m_zoomLevel);
242 m_mapScene->setTilesDrawingLevels(m_zoomLevel);
244 getTiles(m_sceneCoordinate);
248 void MapEngine::zoomOut()
250 qDebug() << __PRETTY_FUNCTION__;
252 if (m_zoomLevel > MIN_VIEW_ZOOM_LEVEL) {
254 emit zoomLevelChanged(m_zoomLevel);
256 m_mapScene->setTilesDrawingLevels(m_zoomLevel);
258 getTiles(m_sceneCoordinate);
262 QString MapEngine::tilePath(int zoomLevel, int x, int y)
264 QString tilePathString(QString::number(zoomLevel) + "/");
265 tilePathString.append(QString::number(x) + "/");
266 tilePathString.append(QString::number(y));
268 return tilePathString;
271 QPoint MapEngine::convertSceneCoordinateToTileNumber(int zoomLevel, QPoint sceneCoordinate)
273 int pow = 1 << (MAX_MAP_ZOOM_LEVEL - zoomLevel);
274 int x = static_cast<int>(sceneCoordinate.x() / (TILE_SIZE_X*pow));
275 int y = static_cast<int>(sceneCoordinate.y() / (TILE_SIZE_Y*pow));
280 QPoint MapEngine::convertTileNumberToSceneCoordinate(int zoomLevel, QPoint tileNumber)
282 int pow = 1 << (MAX_MAP_ZOOM_LEVEL - zoomLevel);
283 int x = tileNumber.x() * TILE_SIZE_X * pow;
284 int y = tileNumber.y() * TILE_SIZE_Y * pow;
289 QPoint MapEngine::convertLatLonToSceneCoordinate(QPointF latLonCoordinate)
291 qDebug() << __PRETTY_FUNCTION__;
293 qreal longitude = latLonCoordinate.x();
294 qreal latitude = latLonCoordinate.y();
296 if ((longitude > MAX_LONGITUDE) || (longitude < MIN_LONGITUDE))
297 return QPoint(UNDEFINED, UNDEFINED);
298 if ((latitude > MAX_LATITUDE) || (latitude < MIN_LATITUDE))
299 return QPoint(UNDEFINED, UNDEFINED);
301 qreal z = static_cast<qreal>(1 << MAX_MAP_ZOOM_LEVEL);
303 qreal x = static_cast<qreal>((longitude + 180.0) / 360.0);
304 qreal y = static_cast<qreal>((1.0 - log(tan(latitude * M_PI / 180.0) + 1.0
305 / cos(latitude * M_PI / 180.0)) / M_PI) / 2.0);
307 return QPointF(x*z*TILE_SIZE_X, y*z*TILE_SIZE_Y).toPoint();