toList method

@override List<LatLng> toList()

Create a list of all the LatLngs along the outline of this region

Not supported on line regions: use toOutlines() instead.

Returns a List<LatLng> which can be used anywhere.

Implementation

@override
List<LatLng> toList() {
  final double rad = radius / 1.852 / 3437.670013352;
  final double lat = center.latitudeInRad;
  final double lon = center.longitudeInRad;
  final List<LatLng> output = [];

  for (int x = 0; x <= 360; x++) {
    final double brng = x * math.pi / 180;
    final double latRadians = math.asin(
      math.sin(lat) * math.cos(rad) +
          math.cos(lat) * math.sin(rad) * math.cos(brng),
    );
    final double lngRadians = lon +
        math.atan2(
          math.sin(brng) * math.sin(rad) * math.cos(lat),
          math.cos(rad) - math.sin(lat) * math.sin(latRadians),
        );

    output.add(
      LatLng(
        latRadians * 180 / math.pi,
        (lngRadians * 180 / math.pi)
            .clamp(-180, 180), // Clamped to fix errors with flutter_map
      ),
    );
  }

  return output;
}