Polygon.fromJson constructor Null safety
Implementation
@override
factory Polygon.fromJson(Map<String, dynamic> json) {
if (json['geometry']['type'] != 'Polygon') {
throw ArgumentError('json is not a Polygon');
}
List<LinearRing> rings =
(json['geometry']['coordinates'] as List<List<dynamic>>)
.map((List<dynamic> shape) => LinearRing(
shape.map((dynamic c) => Coordinate.fromJson(c)).toList()))
.toList();
return Polygon(rings,
properties: Map<String, dynamic>.from(json['properties']));
}