static QPoint convertTileNumberToSceneCoordinate(int zoomLevel, QPoint tileNumber)
{
- int pow = 1 << (MAX_ZOOM_LEVEL - zoomLevel);
+ int pow = 1 << (MAX_MAP_ZOOM_LEVEL - zoomLevel);
int x = tileNumber.x() * TILE_SIZE_X * pow;
int y = tileNumber.y() * TILE_SIZE_Y * pow;
static QPoint convertSceneCoordinateToTileNumber(int zoomLevel, QPointF sceneCoordinate)
{
- int pow = 1 << (MAX_ZOOM_LEVEL - zoomLevel);
+ int pow = 1 << (MAX_MAP_ZOOM_LEVEL - zoomLevel);
int x = static_cast<int>(sceneCoordinate.x() / (TILE_SIZE_X*pow));
int y = static_cast<int>(sceneCoordinate.y() / (TILE_SIZE_Y*pow));
if ((latitude > MAX_LATITUDE) || (latitude < MIN_LATITUDE))
return QPoint(UNDEFINED, UNDEFINED);
- qreal z = static_cast<qreal>(1 << MAX_ZOOM_LEVEL);
+ qreal z = static_cast<qreal>(1 << MAX_MAP_ZOOM_LEVEL);
qreal x = static_cast<qreal>((longitude + 180.0) / 360.0);
qreal y = static_cast<qreal>((1.0 - log(tan(latitude * M_PI / 180.0) + 1.0
return QPointF(x*z*TILE_SIZE_X, y*z*TILE_SIZE_Y);
}
- QRect calculateGrid(QPointF sceneCoordinate);
-
public slots:
/**
* @brief Slot for setting current view location
*/
void setLocation(QPointF sceneCoordinate);
+ void viewResized(const QSize &size);
+
private:
/**
* @brief Build URL for donwloading single map tile from OpenStreetMap tile server
*/
void parseURL(const QUrl &url, int &zoom, int &x, int &y);
+ /**
+ * @brief Set zValues for all tiles in the scene
+ *
+ * Drawing order of MapTiles, which has the zoom level higher than the current
+ * zoom level, is reversed and those MapTiles are mapped between lower level MapTiles.
+ * Example: If maximum zoom level is 18 and current view zoomlevel is 15, then
+ * the drawing order from top to bottom is 15, 16, 14, 17, 13, 18, 12, 11, 10, ...
+ */
+ void setZValues();
+
int tileMaxValue(int zoomLevel);
+ /**
+ * @brief Calculates grid of tile coordinates from current scene coordinate.
+ *
+ * Grid size is calculated from view size and scene's current center coordinate.
+ *
+ * @param sceneCoordinate scene's current center coordinate
+ * @return QRect grid of tile coordinates
+ */
+ QRect calculateGrid(QPointF sceneCoordinate);
+
+ /**
+ * @brief Calculate new tiles to fetch.
+ *
+ * @param sceneCoordinate scene's center coordinate
+ */
+ void calculateNewTiles(QPointF sceneCoordinate);
+
+ /**
+ * @brief Removes tiles which are out of view bounds.
+ */
+ void removeOldTiles();
+
+ /**
+ * @brief Checks if center tile has changed.
+ *
+ * @param sceneCoordinate scene's center coordinate
+ * @return bool true if center tile changed, false otherwise
+ */
+ bool centerTileChanged(QPointF sceneCoordinate);
private slots:
/**
*/
void mapImageReceived(const QUrl &url, const QPixmap &pixmap);
- void viewResized(const QSize &size);
-
/**
* @brief Slot for zooming in
*
private:
- void calculateTileGrid();
-
MapScene *m_mapScene; ///< Scene for map tiles
MapFetcher *m_mapFetcher; ///< Fetcher for map tiles
int m_zoomLevel; ///< Current zoom level
QHash<QString, MapTile *> mapTilesInScene; ///< List of map tiles in map scene
QSize m_viewSize;
QPointF m_sceneCoordinate;
+ QQueue<QString> mapTilesInView;
+ QPoint m_centerTile;
+ QRect viewGrid;
};
#endif // MAPENGINE_H