encodePolyline static method

String encodePolyline(List<LatLng> path, { int precision = 5, })

Encodes path into a Google-style polyline string.

Implementation

static String encodePolyline(List<LatLng> path, {int precision = 5}) {
  if (path.isEmpty) {
    return '';
  }

  final factor = math.pow(10, precision).toDouble();
  final buffer = StringBuffer();
  var lastLat = 0;
  var lastLng = 0;

  for (final point in path) {
    final lat = (point.latitude * factor).round();
    final lng = (point.longitude * factor).round();

    _encodeValue(lat - lastLat, buffer);
    _encodeValue(lng - lastLng, buffer);

    lastLat = lat;
    lastLng = lng;
  }

  return buffer.toString();
}