toJson method 
    
      
dynamic
toJson(
[ - bool addGeometry = true
]) 
    
    
  Implementation
  dynamic toJson([bool addGeometry = true]) {
  final json = <String, dynamic>{};
  void addIfPresent(String fieldName, dynamic value) {
    if (value != null) {
      json[fieldName] = value;
    }
  }
  addIfPresent('lineJoin', lineJoin);
  addIfPresent('lineOpacity', lineOpacity);
  addIfPresent('lineColor', lineColor);
  addIfPresent('lineWidth', lineWidth);
  addIfPresent('lineGapWidth', lineGapWidth);
  addIfPresent('lineOffset', lineOffset);
  addIfPresent('lineBlur', lineBlur);
  addIfPresent('linePattern', linePattern);
  if (addGeometry) {
    addIfPresent('geometry',
        geometry?.map((LatLng latLng) => latLng.toJson()).toList());
  }
  addIfPresent('draggable', draggable);
  return json;
}