React利用turf插件判断点是否在面内（包含点在面边界，openlayers无法判断）

需要提前下载turf插件，命令：npm install @turf/turf
使用：

import * as turf from '@turf/turf';

判断点是否在面内：（lonlatValid()只是自己写的校验方法，可忽略）

const piontisin = (rtkobj: any) => {
    
    
    if (lonlatValid(rtkobj.orderpoint_x) && lonlatValid(rtkobj.orderpoint_y) == true) {
    
    
      //判断点是否在面内
      let point_arr = turf.point(
        transform(
          [Number(rtkobj.orderpoint_x), Number(rtkobj.orderpoint_y)],
          'EPSG:4326',
          'EPSG:3857'
        )
      );
      let poly = turf.polygon([
        [
          transform([Number(rtkobj.p1_x), Number(rtkobj.p1_y)], 'EPSG:4326', 'EPSG:3857'),
          transform([Number(rtkobj.p2_x), Number(rtkobj.p2_y)], 'EPSG:4326', 'EPSG:3857'),
          transform([Number(rtkobj.p3_x), Number(rtkobj.p3_y)], 'EPSG:4326', 'EPSG:3857'),
          transform([Number(rtkobj.p4_x), Number(rtkobj.p4_y)], 'EPSG:4326', 'EPSG:3857'),
          transform([Number(rtkobj.p1_x), Number(rtkobj.p1_y)], 'EPSG:4326', 'EPSG:3857')
        ]
      ]);
      let isin = turf.booleanPointInPolygon(point_arr, poly);
      if (isin == false) {
    
    
        message.error('点不位于面内！');
      }
    }
  };