interact.js

<a href="http://interactjs.io"><img alt="interact.js" src="https://c4d6f7d727e094887e93-4ea74b676357550bd514a6a5b344c625.ssl.cf2.rackcdn.com/ijs-solid.svg" height="70px" width="100%"></a>

<h2>
  JavaScript drag and drop, resizing and multi-touch gestures with inertia and snapping for modern browsers (and also IE9+).
</h2>

<div align="center">
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</div>
<br>

Features include:

- **inertia** and **snapping**
- **multi-touch**, simultaneous interactions
- cross browser and device, supporting the **desktop and mobile** versions of
  Chrome, Firefox and Opera as well as **Internet Explorer 9+**
- interaction with [**SVG**](http://interactjs.io/#use_in_svg_files) elements
- being **standalone and customizable**
- **not modifying the DOM** except to change the cursor (but you can disable
  that)

## Installation

- [npm](https://www.npmjs.org/): `npm install interactjs`
- [jsDelivr CDN](https://cdn.jsdelivr.net/npm/interactjs/): `<script src="https://cdn.jsdelivr.net/npm/interactjs/dist/interact.min.js"></script>`
- [unpkg CDN](https://unpkg.com/interactjs/): `<script src="https://unpkg.com/interactjs/dist/interact.min.js"></script>`
- [Rails 5.1+](https://rubyonrails.org/):
  1. `yarn add interactjs`
  2. `//= require interactjs/interact`
- [Webjars SBT/Play 2](https://www.webjars.org/): `libraryDependencies ++= Seq("org.webjars.npm" % "interactjs" % version)`

### Typescript definitions

The project is written in Typescript and the npm package includes the type
definitions, but if you need the typings alone, you can install them with:

```
npm install --save-dev @interactjs/types
```

## Documentation

http://interactjs.io/docs

## Example

```javascript
var pixelSize = 16;

interact('.rainbow-pixel-canvas')
  .origin('self')
  .draggable({
    modifiers: [
      interact.modifiers.snap({
        // snap to the corners of a grid
        targets: [
          interact.snappers.grid({ x: pixelSize, y: pixelSize }),
        ],
      })
    ],
    listeners: {
      // draw colored squares on move
      move: function (event) {
        var context = event.target.getContext('2d'),
            // calculate the angle of the drag direction
            dragAngle = 180 * Math.atan2(event.dx, event.dy) / Math.PI;

        // set color based on drag angle and speed
        context.fillStyle = 'hsl(' + dragAngle + ', 86%, '
                            + (30 +