calculatePolygonArea method Null safety

Future<double?> calculatePolygonArea(
  1. List coordinates
)

计算多边形polygon面积

List<BMFCoordinate> coordinates:多边形顶点经纬度

返回区域面积，单位：平方米

Implementation

static Future<double?> calculatePolygonArea(
    List<BMFCoordinate> coordinates) async {
  return await BMFUtilsCalculateDispatcher.calculatePolygonArea(
      _calcChannel, coordinates);
}