# @turf/bezier

# bezier

Takes a [line](http://geojson.org/geojson-spec.html#linestring) and returns a curved version
by applying a [Bezier spline](http://en.wikipedia.org/wiki/B%C3%A9zier_spline)
algorithm.

The bezier spline implementation is by [Leszek Rybicki](http://leszek.rybicki.cc/).

**Parameters**

-   `line` **[Feature](http://geojson.org/geojson-spec.html#feature-objects)<[LineString](http://geojson.org/geojson-spec.html#linestring)>** input LineString
-   `resolution` **\[[number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number)]** time in milliseconds between points (optional, default `10000`)
-   `sharpness` **\[[number](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number)]** a measure of how curvy the path should be between splines (optional, default `0.85`)

**Examples**

```javascript
var line = turf.lineString([
  [-76.091308, 18.427501],
  [-76.695556, 18.729501],
  [-76.552734, 19.40443],
  [-74.61914, 19.134789],
  [-73.652343, 20.07657],
  [-73.157958, 20.210656]
]);

var curved = turf.bezier(line);

//addToMap
var addToMap = [line, curved]
curved.properties = { stroke: '#0F0' };
```

Returns **[Feature](http://geojson.org/geojson-spec.html#feature-objects)<[LineString](http://geojson.org/geojson-spec.html#linestring)>** curved line

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---

This module is part of the [Turfjs project](http://turfjs.org/), an open source
module collection dedicated to geographic algorithms. It is maintained in the
[Turfjs/turf](https://github.com/Turfjs/turf) repository, where you can create
PRs and issues.

### Installation

Install this module individually:

```sh
$ npm install @turf/bezier
```

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

```sh
$ npm install @turf/turf
```