Function closestPointOnPolyline

closestPointOnPolyline(p, points): {
    closestIndex: number;
    closestLength: number;
    closestPoint: GeoPoint;
    closestPrePointDist: number;
}
点到多段线的最近点
Parameters
- p: GeoPoint
- points: GeoPoint[]
Returns {
    closestIndex: number;
    closestLength: number;
    closestPoint: GeoPoint;
    closestPrePointDist: number;
}
- closestIndex: number
- closestLength: number
- closestPoint: GeoPoint
- closestPrePointDist: number