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Version: 7.2.0

coordReduce

描述​

¥Description

减少任何 GeoJSON 对象中的坐标，类似于 Array.reduce()

¥Reduce coordinates in any GeoJSON object, similar to Array.reduce()

参数​

¥Parameters

名称类型描述
geojsonAllGeoJSON任意 GeoJSON 对象
callbackcoordReduceCallback一个方法，该方法接受 (previousValue, currentCoord, coordIndex)
initialValue?Reducer用作回调函数首次调用的第一个参数的值。
excludeWrapCoord?boolean是否在迭代中包含环绕环的 LinearRings 的最终坐标。(默认 false)

返回​

¥Returns

Reducer 简化后的值。

¥Reducer The value that results from the reduction.

示例​

¥Examples

var features = turf.featureCollection([
  turf.point([26, 37], { foo: "bar" }),
  turf.point([36, 53], { hello: "world" }),
]);

turf.coordReduce(
  features,
  function (
    previousValue,
    currentCoord,
    coordIndex,
    featureIndex,
    multiFeatureIndex,
    geometryIndex,
  ) {
    //=previousValue
    //=currentCoord
    //=coordIndex
    //=featureIndex
    //=multiFeatureIndex
    //=geometryIndex
    return currentCoord;
  },
);

安装​

¥Installation

$ npm install @turf/meta

import { coordReduce } from "@turf/meta";
const result = coordReduce(...);
$ npm install @turf/turf

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