# @turf/bezier-spline

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## bezierSpline

Takes a [line][1] and returns a curved version
by applying a [Bezier spline][2]
algorithm.

The bezier spline implementation is by [Leszek Rybicki][3].

### Parameters

*   `line` **[Feature][4]<[LineString][1]>** input LineString
*   `options` **[Object][5]** Optional parameters (optional, default `{}`)

    *   `options.properties` **[Object][5]** Translate properties to output (optional, default `{}`)
    *   `options.resolution` **[number][6]** time in milliseconds between points (optional, default `10000`)
    *   `options.sharpness` **[number][6]** 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.bezierSpline(line);

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

Returns **[Feature][4]<[LineString][1]>** curved line

[1]: https://tools.ietf.org/html/rfc7946#section-3.1.4

[2]: http://en.wikipedia.org/wiki/B%C3%A9zier_spline

[3]: http://leszek.rybicki.cc/

[4]: https://tools.ietf.org/html/rfc7946#section-3.2

[5]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Object

[6]: https://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/Number

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---

This module is part of the [Turfjs project](https://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 single module individually:

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

Or install the all-encompassing @turf/turf module that includes all modules as functions:

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