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Version: 7.3.0

transformScale

描述

🌐 Description

从给定点按缩放因子缩放 GeoJSON 对象,例如 factor=2 会使每个对象变大 200%。如果提供的是 FeatureCollection,原点将基于每个单独的要素计算,除非提供了精确的点。

🌐 Scale GeoJSON objects from a given point by a scaling factor e.g. factor=2 would make each object 200% larger. If a FeatureCollection is provided, the origin point will be calculated based on each individual feature unless an exact

参数

🌐 Parameters

名称类型描述
geojsonGeoJSON | GeometryCollection要缩放的对象
因子数字缩放因子,正值大于 0。介于 0 和 1 之间的数字将缩小 geojson,大于 1 的数字将放大 geojson,因子为 1 时不会改变 geojson。
options?对象可选参数 (默认 {})
options.origin? | 坐标缩放的起始点(字符串选项:sw/se/nw/ne/center/centroid) (默认 'centroid')
options.mutate?布尔允许修改 GeoJSON 输入(如果为 true,性能将显著提高)(默认 false)

返回

🌐 Returns

GeoJSON | GeometryCollection 缩放的 GeoJSON

示例

🌐 Examples

const poly = turf.polygon([
[
[0, 29],
[3.5, 29],
[2.5, 32],
[0, 29],
],
]);
const scaledPoly = turf.transformScale(poly, 3);

安装

🌐 Installation

$ npm install @turf/transform-scale

import { transformScale } from "@turf/transform-scale";
const result = transformScale(...);
$ npm install @turf/turf

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