geometry<T extends Geometry> method

@override T geometry<T extends Geometry>(dynamic data)

Parses a geometry from a data object.

Throws FormatException if parsing fails.

Implementation

@override
T geometry<T extends Geometry>(dynamic data) {
  // expects data of Map<String, dynamic> as returned by json.decode()
  final json = _ensureDecodedMap(data);
  dynamic geom;
  switch (json['type']) {
    case 'Point':
      // expected 'coordinates' data like : [100.0, 100.0, 10.0]
      geom = point(json['coordinates'] as Iterable);
      break;
    case 'LineString':
      // expected 'coordinates' data like :
      // [
      //   [100.0, 100.0, 10.0],
      //   [200.0, 200.0, 20.0]
      // ]
      geom = lineString(json['coordinates'] as Iterable);
      break;
    case 'Polygon':
      // expected 'coordinates' data like :
      // [
      //   [
      //     [100.0, 100.0, 10.0],
      //     [200.0, 200.0, 20.0]
      //     [100.0, 200.0, 20.0]
      //     [100.0, 100.0, 10.0],
      //   ]
      // ]
      geom = polygon(json['coordinates'] as Iterable);
      break;
    case 'MultiPoint':
      // expected 'coordinates' data like :
      // [
      //   [100.0, 100.0, 10.0],
      //   [200.0, 200.0, 20.0]
      // ]
      geom = multiPoint(json['coordinates'] as Iterable);
      break;
    case 'MultiLineString':
      // expected 'coordinates' data like :
      // [
      //   [
      //     [100.0, 100.0, 10.0],
      //     [200.0, 200.0, 20.0]
      //   ],
      //   [
      //     [300.0, 300.0, 30.0],
      //     [400.0, 400.0, 40.0]
      //   ]
      // ]
      geom = multiLineString(json['coordinates'] as Iterable);
      break;
    case 'MultiPolygon':
      // expected 'coordinates' data like :
      // [
      //   [
      //     [
      //       [100.0, 100.0, 10.0],
      //       [200.0, 200.0, 20.0]
      //       [100.0, 200.0, 20.0]
      //       [100.0, 100.0, 10.0],
      //     ]
      //   ]
      // ]
      geom = multiPolygon(json['coordinates'] as Iterable);
      break;
    case 'GeometryCollection':
      geom = geometryCollection(json['geometries'] as Iterable);
      break;
  }
  if (geom is T) {
    return geom;
  }
  throw const FormatException('Not valid GeoJSON geometry.');
}