polygon with points

[glauco111]

please, help me with creation of polygon with coordinates on the map. i use flutter google maps package. i need export kml or gpx archive for others programs.

[kb0]

If you have polygone on google maps (for. ex. Polyline) you can easily export it as gpx:

  // create Gpx object
  final gpx = Gpx();
  gpx.version = '1.1';
  gpx.creator = 'dart-gpx library';
  gpx.metadata = Metadata();
  gpx.metadata.name = 'routes';
  gpx.metadata.time = DateTime.utc(2020, 1, 2, 3, 4, 5);

  // populate track from Google Maps Polyline ('package:google_maps_flutter')
  gpx.trks = [
    Trk(name: 'your track', trksegs: [
      Trkseg(trkpts:
        // polyline - your polyline object
        polyline.points.map((point) {
          return Wpt(lat: point.latitude, lon: point.longitude);
        }).toList()
      )
    ])
  ];

  // get gpx string
  GpxWriter().asString(gpx, pretty: true)