node-red-contrib-leap-motion
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Node-Red nodes for leap motion
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Markdown
[](https://developer.leapmotion.com/leapjs/)
Welcome to the [Leap Motion](https://www.leapmotion.com) JavaScript framework.
[](https://travis-ci.org/leapmotion/leapjs)
```javascript
Leap.loop(function(frame){
console.log(frame.hands.length);
});
```
Learn more in the [Getting Started Guide](https://developer.leapmotion.com/leapjs/getting-started), and the [API Reference](https://developer.leapmotion.com/documentation/javascript/api/Leap_Classes.html).
### Installation
**Browser**: Download the latest `leap.js` [from our CDN](https://developer.leapmotion.com/leapjs/welcome).
**Bower**: `bower install leapjs`
**Node**: `npm install leapjs`
### Examples
Visit [developer.leapmotion.com/downloads/skeletal-beta/gallery](https://developer.leapmotion.com/downloads/skeletal-beta/gallery) for the latest examples.
Some more basic examples have also been included in the [examples/](https://github.com/leapmotion/leapjs/tree/master/examples) directory.
### Plugins
[Plugins](http://developer.leapmotion.com/leapjs/plugins) are used to modularly extend Leap Webapps with external libraries.
Here we use the `screenPosition` plugin to get the position of the hand as an on-screen cursor.
```javascript
Leap.loop({
hand: function(hand){
console.log( hand.screenPosition() );
}
}).use('screenPosition');
```
### Misc
LeapJS includes the vector math library [GL-Matrix](http://glmatrix.net/) for your use and convenience. For example, we can easily compute a dot product. See [the example](https://github.com/leapmotion/leapjs/blob/master/examples/math.html) and [the gl matrix docs](http://glmatrix.net/docs/2.2.0/) for more info.
```javascript
var dot = Leap.vec3.dot(hand.direction, hand.indexFinger.direction);
```
Also visit the wiki for [how to make plugins](https://github.com/leapmotion/leapjs/wiki/Plugins),
[protocol guide](https://github.com/leapmotion/leapjs/wiki/Protocol), and [other stuff](https://github.com/leapmotion/leapjs/wiki).
### Contributing
Add your name, email, and github account to the CONTRIBUTORS.txt list, thereby agreeing to the terms and conditions of the Contributor License Agreement.
Open a Pull Request. If your information is not in the CONTRIBUTORS file, your pull request will not be reviewed.
[](http://githalytics.com/leapmotion/leapjs)
[](https://github.com/leapmotion/LeapJS)