nearestPointOnLine

Takes a Point and a LineString and calculates the closest Point on the (Multi)LineString.
获取一个点和一个LineString，并计算(多)LineString上最近的点。

参数

参数	类型	描述
lines	(Geometry|Feature <(LineString|MultiLineString)>)	lines to snap to
pt	(Geometry|Feature <Point>|Array)	point to snap from
options	Object	可选参数：见下文

options选项

属性	类型	默认值	描述
units	string	kilometers	可以是度、弧度、英里或公里

返回

Feature <Point> - closest point on the line to point. The properties object will contain three values: index : closest point was found on nth line part, dist : distance between pt and the closest point, location : distance along the line between start and the closest point.

示例

var line = turf.lineString([
    [-77.031669, 38.878605],
    [-77.029609, 38.881946],
    [-77.020339, 38.884084],
    [-77.025661, 38.885821],
    [-77.021884, 38.889563],
    [-77.019824, 38.892368]
]);
var pt = turf.point([-77.037076, 38.884017]);

var snapped = turf.nearestPointOnLine(line, pt, {units: 'miles'});