# toMap method

Map <String, dynamic> toMap ()

将对象装换为可序列化的对象

## Implementation

    Map<String, dynamic> toMap() {
      final Map<String, dynamic> updateMap = <String, dynamic>{};

      void addIfNonNull(String fieldName, dynamic value) {
        if (value != null) {
          updateMap[fieldName] = value;
        }
      }

      addIfNonNull('polylinesToAdd', serializeOverlaySet(polylinesToAdd));
      addIfNonNull('polylinesToChange', serializeOverlaySet(polylinesToChange));
      addIfNonNull('polylineIdsToRemove', polylineIdsToRemove.toList());

      return updateMap;
    }