private void UpdateAnchor()
{
// Get the tile Id in the center of the screen (at lon/lat)
anchor = GeoCalculator.AbsoluteCoordinateToTile(longitude, latitude, zoomLevel);
// Get the upper left corner (in meters) of the anchor tile
var anchorMeters = GeoCalculator.AbsoluteTileToMeters(anchor.X, anchor.Y, anchor.Z);
// Calculate the offset (in units) between the requested lon/lat and the anchor
anchorOffsetInUnits = GeoCalculator.RelativeMetersToPixels(anchorMeters - currentMeters, zoomLevel).ToVector2() * pixelsToUnits;
// Also need to update the map bounds
UpdateMapBounds();
}
