buffer

描述

¥Description

计算给定半径的输入要素的缓冲区。

¥Calculates a buffer for input features for a given radius.

使用负半径时，如果生成的几何图形与半径大小相比太小，则可能无效。如果输入为要素集合 (FeatureCollection)，则输出要素集合 (FeatureCollection) 中仅返回有效成员。 - 即，输出集合的成员可能少于输入集合，甚至为空。

¥When using a negative radius, the resulting geometry may be invalid if it's too small compared to the radius magnitude. If the input is a FeatureCollection, only valid members will be returned in the output FeatureCollection - i.e., the output collection may have fewer members than the input, or even be empty.

参数

¥Parameters

名称	类型	描述
geojson	FeatureCollection | 几何图形 | 特性<any>	要缓冲的输入
radius	number	绘制缓冲区的距离（允许为负值）
options?	对象	可选参数（默认值：）
options.units?	单位	支持所有有效的 Turf 单位。(默认 "kilometers")
options.steps?	number	步数（默认值 8）

返回

¥Returns

FeatureCollection | 特性<多边形 | MultiPolygon> | 未定义的缓冲要素

¥FeatureCollection | Feature<Polygon | MultiPolygon> | undefined buffered features

示例

¥Examples

var point = turf.point([-90.54863, 14.616599]);
var buffered = turf.buffer(point, 500, { units: "miles" });

安装

¥Installation

$ npm install @turf/buffer

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

$ npm install @turf/turf

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