/**
* @param zoom level of the tile
* @return how many pixels of the screen occupies one pixel of the tile
*/
private double getTileToScreenRatio(int zoom) {
MapView mv = Main.map.mapView;
LatLon topLeft = mv.getLatLon(0, 0);
LatLon botLeft = mv.getLatLon(0, tileSource.getTileSize());
TileXY topLeftTile = tileSource.latLonToTileXY(topLeft.toCoordinate(), zoom);
ICoordinate north =
tileSource.tileXYToLatLon(topLeftTile.getXIndex(), topLeftTile.getYIndex(), zoom);
ICoordinate south =
tileSource.tileXYToLatLon(topLeftTile.getXIndex(), topLeftTile.getYIndex() + 1, zoom);
return Math.abs((north.getLat() - south.getLat()) / (topLeft.lat() - botLeft.lat()));
}
