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patrickyin/TilePosition.java

Created August 26, 2017 12:02
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TilePosition
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TilePosition.java
public TilePosition getTilePosition(float zoomLevel, double latitude, double longitude) {
int tileZoom = round(zoomLevel);
int tileX = (int) ((longitude + 180.0) / 360.0 * pow(2.0, tileZoom));
int tileY = (int)((1.0 - log(tan(latitude * PI / 180.0) + 1.0 / cos(latitude * PI / 180.0)) / PI) / 2.0 * pow(2.0, tileZoom));
tileY = (int) (pow(2.0, tileZoom) - tileY - 1.0); // flip Y, this is only for mbtiles file
return new TilePosition(tileZoom, tileX, tileY);
}
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