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GeoJSON package for Dart and Flutter developers to create, read, search, update and delete the geospatial data interchange format (GIS data).

example/README.md

Examples #

Create GeoJSON object #

  final map = {
    'type': 'Point',
    'coordinates': [105.77389, 21.0720414]
  };

  final jsonString =
      '{"type": "Point", "coordinates": [105.78070163726807, 21.067921688241626]}';

  final polygonCoordinates = [
    [
      [104.765625, 20.468189],
      [106.545410, 20.468189],
      [106.545410, 21.596150],
      [104.765625, 21.596150],
      [104.765625, 20.468189]
    ]
  ];

  // Creating a GeoJSON object from data without knowing its type
  final pointFromMap = GeoJSON.fromMap(map);

  // Creating GeoJSONPoint object from JSON string already know its type
  final pointFromJSON = GeoJSONPoint.fromJSON(jsonString);

  // Creating GeoJSONGeometry object from data without knowing its type
  final geometryFromMap = GeoJSONGeometry.fromMap(map);

  // Creating GeoJSONPoint object from JSON string already know its type
  final geometryFromJSON = GeoJSONPoint.fromJSON(jsonString);

  // Creating GeoJSONPoint object from coordinates data
  final pointFromCoordinates = GeoJSONPoint([105.77389, 21.0720414]);

  // Creating a GeoJSONFeature object
  final feature = GeoJSONFeature(
    GeoJSONPoint([105.780701, 21.067921]),
    properties: {
      'title': 'Hanoi University of Mining and Geology',
      'url': 'http://humg.edu.vn',
    },
  );

  // Creating GeoJSONFeatureCollection object
  final featureCollection = GeoJSONFeatureCollection([]);
  featureCollection.features.add(feature);

  // Creating more GeoJSONFeature
  final polygon = GeoJSONPolygon(polygonCoordinates);
  final polygonFeature = GeoJSONFeature(polygon);
  featureCollection.features.add(polygonFeature);

Demo #

import 'package:geojson_vi/geojson_vi.dart';

void main() {
  final featureCollection = GeoJSONFeatureCollection([]);
  final point = GeoJSONPoint([105.7743099, 21.0717561]);
  final feature = GeoJSONFeature(point, properties: {
    'marker-color': '#7e7e7e',
    'marker-size': 'medium',
    'marker-symbol': 'college',
    'title': 'Hanoi University of Mining and Geology',
    'department': 'Geoinformation Technology',
    'address':
        'No.18 Vien Street - Duc Thang Ward - Bac Tu Liem District - Ha Noi, Vietnam',
    'url': 'http://humg.edu.vn'
  });
  featureCollection.features.add(feature);
  final pos1 = [105.7771289, 21.0715458];
  final pos2 = [105.7745218, 21.0715658];
  final pos3 = [105.7729125, 21.0715358];
  final lineString = GeoJSONLineString([pos1, pos2, pos3]);
  featureCollection.features.add(GeoJSONFeature(lineString, properties: {
    'stroke': '#7e7e7e',
    'stroke-width': 2,
    'stroke-opacity': 1,
    'title': 'Vien St.'
  }));
  final p01 = [105.7739666, 21.0726795]; // The first position
  final p02 = [105.7739719, 21.0721991];
  final p03 = [105.7743394, 21.0721966];
  final p04 = [105.7743310, 21.0725269];
  final p05 = [105.7742564, 21.0726120];
  final p06 = [105.7741865, 21.0726095];
  final p07 = [105.7741785, 21.0726746];
  final p08 = [105.7739666, 21.0726795]; // The last position
  final linerRing = [p01, p02, p03, p04, p05, p06, p07, p08];
  featureCollection.features.add(
    GeoJSONFeature(
      GeoJSONPolygon([linerRing]),
      properties: {
        'stroke': '#555555',
        'stroke-width': 2,
        'stroke-opacity': 1,
        'fill': '#ab7942',
        'fill-opacity': 0.5,
        'title': "HUMG's Office"
      },
    ),
  );
  print(featureCollection.toJSON());
}
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Publisher

verified publisher iconhumg.edu.vn

GeoJSON package for Dart and Flutter developers to create, read, search, update and delete the geospatial data interchange format (GIS data).

Repository (GitHub)

Documentation

API reference

License

Icon for licenses.MIT (LICENSE)

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