toUrlString method
Implementation
@override
String toUrlString() {
if (locations.isEmpty) {
throw StateError(
'Marker must contain at least one location. '
'Empty array was provided to "locations" argument.',
);
}
String string = "";
if (anchor != null) string += "anchor:${anchor!.value}$_separator";
string += "icon:$icon$_separator";
if (locations.isNotEmpty) string += _markerLocationsString;
return string;
}