getIntersection.js

private checkIntersection() {
    const alreadyChecked: number[][] = [];
    for (let i = 0; i < this._polyLines.length; i += 1) {
      for (let j = 0; j < this._polyLines.length; j += 1) {
        if (i === j) continue;
        const isAlreadyCompared: number[] | undefined = alreadyChecked.find((item: number[]) => {
          return isEqual(sortBy(item, Number), sortBy([j, i], Number));
        });
        if (isAlreadyCompared && isAlreadyCompared.length) continue;
        alreadyChecked.push([i, j]);
        const cords1: any[] = convertToCords(this._polyLines[i].getPath());
        const cords2: any[] = convertToCords(this._polyLines[j].getPath());
        const line1 = lineString(cords1);
        const line2 = lineString(cords2);
        const intersects = lineIntersect(line1, line2);
        if (intersects && intersects.features && intersects.features.length) {
          const item: any = intersects.features[0];
          const { coordinates } = item.geometry;
          if (coordinates && coordinates.length > 0) {
            this._intersectionPoints.push({
              lat: coordinates[0],
              lng: coordinates[1],
              volume: this._polyLines[i].getVolume(),
            });
          }
        }
      }
    }
  }