findPoint

描述

¥Description

Finds a particular Point from a GeoJSON using @turf/meta indexes.

允许使用负索引。

¥Negative indexes are permitted.

参数

¥Parameters

名称	类型	描述
geojson	FeatureCollection | 特性 | 几何图形	Any GeoJSON Feature or Geometry
options?	对象	可选参数（默认 ）
options.featureIndex?	number	要素索引（默认 0）
options.multiFeatureIndex?	number	多要素索引（默认值为 0）
options.geometryIndex?	number	几何体索引（默认 0）
options.coordIndex?	number	坐标索引（默认 0）
options.properties?	对象	Translate Properties to output Point (default )
options.bbox?	BBox	Translate BBox to output Point (default )
options.id?	number | string	Translate Id to output Point (default )

返回

¥Returns

特性<点> 2-vertex GeoJSON Feature Point

¥Feature<Point> 2-vertex GeoJSON Feature Point

示例

¥Examples

var multiLine = turf.multiLineString([
  [
    [10, 10],
    [50, 30],
    [30, 40],
  ],
  [
    [-10, -10],
    [-50, -30],
    [-30, -40],
  ],
]);

// First Segment (defaults are 0)
turf.findPoint(multiLine);
// => Feature<Point<[10, 10]>>

// First Segment of the 2nd Multi-Feature
turf.findPoint(multiLine, { multiFeatureIndex: 1 });
// => Feature<Point<[-10, -10]>>

// Last Segment of last Multi-Feature
turf.findPoint(multiLine, { multiFeatureIndex: -1, coordIndex: -1 });
// => Feature<Point<[-30, -40]>>

安装

¥Installation

$ npm install @turf/meta

import { findPoint } from "@turf/meta";
const result = findPoint(...);

$ npm install @turf/turf

import * as turf from "@turf/turf";
const result = turf.findPoint(...);