ellipse

描述

¥Description

Takes a 点 and calculates the ellipse polygon given two semi-axes expressed in variable units and steps for precision.

¥Takes a Point and calculates the ellipse polygon given two semi-axes expressed in variable units and steps for precision.

参数

¥Parameters

名称	类型	描述
center	坐标系	中心点
xSemiAxis	number	semi (major) axis of the ellipse along the x-axis
ySemiAxis	number	semi (minor) axis of the ellipse along the y-axis
options?	对象	可选参数（默认 ）
options.angle?	number	angle of rotation in decimal degrees, positive clockwise (default 0)
options.pivot?	坐标系	point around which any rotation will be performed (default center)
options.steps?	number	number of steps (default 64)
options.units?	string	unit of measurement for axes (default 'kilometers')
options.properties?	对象	属性（默认 ）

返回

¥Returns

特性<多边形> 椭圆多边形

¥Feature<Polygon> ellipse polygon

示例

¥Examples

var center = [-75, 40];
var xSemiAxis = 5;
var ySemiAxis = 2;
var ellipse = turf.ellipse(center, xSemiAxis, ySemiAxis);

安装

¥Installation

$ npm install @turf/ellipse

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

$ npm install @turf/turf

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