difference

描述

¥Description

通过从第一个 polygons 中裁剪后续多边形，计算多个 polygons 之间的差异。

¥Finds the difference between multiple polygons by clipping the subsequent polygon from the first.

参数

¥Parameters

名称	类型	描述
features	FeatureCollection<多边形 | MultiPolygon>	输入多边形要素

返回

¥Returns

特性<多边形 | MultiPolygon> | null 多边形或多多边形特性，显示 polygon1 的区域，不包括 polygon2 的区域（如果为空则返回 null）

¥Feature<Polygon | MultiPolygon> | null a Polygon or MultiPolygon feature showing the area of polygon1 excluding the area of polygon2 (if empty returns null)

示例

¥Examples

var polygon1 = turf.polygon(
  [
    [
      [128, -26],
      [141, -26],
      [141, -21],
      [128, -21],
      [128, -26],
    ],
  ],
  {
    fill: "#F00",
    "fill-opacity": 0.1,
  },
);
var polygon2 = turf.polygon(
  [
    [
      [126, -28],
      [140, -28],
      [140, -20],
      [126, -20],
      [126, -28],
    ],
  ],
  {
    fill: "#00F",
    "fill-opacity": 0.1,
  },
);

var difference = turf.difference(turf.featureCollection([polygon1, polygon2]));

安装

¥Installation

$ npm install @turf/difference

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

$ npm install @turf/turf

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