@turf/circle

What is @turf/circle?

@turf/circle is a module within the Turf.js library that allows you to create circular polygons. It is useful for geospatial analysis and manipulation, enabling you to generate circles with a specified radius around a given point.

What are @turf/circle's main functionalities?

Create a Circle

This feature allows you to create a circle polygon with a specified radius around a given center point. The `steps` option defines the number of points used to approximate the circle, and the `units` option specifies the unit of measurement for the radius.

const turf = require('@turf/turf');
const center = [0, 0];
const radius = 5;
const options = { steps: 64, units: 'kilometers' };
const circle = turf.circle(center, radius, options);
console.log(circle);

Customizing Circle Properties

This feature allows you to customize the properties of the circle, such as the number of steps for approximation, the units of measurement, and additional properties like a name.

const turf = require('@turf/turf');
const center = [0, 0];
const radius = 5;
const options = { steps: 32, units: 'miles', properties: { name: 'My Circle' } };
const circle = turf.circle(center, radius, options);
console.log(circle);

Other packages similar to @turf/circle

leaflet

Leaflet is a popular open-source JavaScript library for mobile-friendly interactive maps. It provides similar functionality for creating circles on maps, but it is more focused on rendering and interaction rather than geospatial analysis.

openlayers

OpenLayers is a high-performance, feature-packed library for all your mapping needs. It offers similar capabilities for creating and manipulating circles, but it is more comprehensive and includes a wide range of other geospatial functionalities.

geolib

Geolib is a small library to provide basic geospatial operations like distance calculation, conversion of units, and bounding boxes. It can create circles, but it is more lightweight and less feature-rich compared to @turf/circle.

README

@turf/circle

circle

Takes a Point and calculates the circle polygon given a radius in degrees, radians, miles, or kilometers; and steps for precision.

Parameters

• center (Feature<Point> | Array<number>) center point
• radius number radius of the circle
• steps [number] number of steps (optional, default 64)
• units [string] miles, kilometers, degrees, or radians (optional, default kilometers)
• properties [Object] properties (optional, default {})

Examples

var center = [-75.343, 39.984];
var radius = 5;
var steps = 10;
var units = 'kilometers';
var properties = {foo: 'bar'};

var circle = turf.circle(center, radius, steps, units, properties);

//addToMap
var addToMap = [turf.point(center), circle]

Returns Feature<Polygon> circle polygon

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This module is part of the Turfjs project, an open source module collection dedicated to geographic algorithms. It is maintained in the Turfjs/turf repository, where you can create PRs and issues.

Installation

Install this module individually:

$ npm install @turf/circle

Or install the Turf module that includes it as a function:

$ npm install @turf/turf