easing

testing	coverage

easing

    const Easing = require('easing')

    const x = Easing(11,'linear')
    // [ 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1 ]

    const y = Easing(11,'quadratic')
    // [ 0, 0.01, 0.04, 0.09, 0.16, 0.25, 0.36, 0.49, 0.64, 0.81, 1 ]

install

npm install --save easing

On the client

drop it in

Simply include browser-easing.js and you can directly use the Easing function globally

    <script src="browser-easing.js"></script>
    <script>
    var x = Easing(11,'cubic');
    console.log(x)
    </script>

or with browserify

const Easing = require('easing')

Differences from the Original Package

This is a fork of rook2pawn/node-easing with the following changes:

• Transpile source files with Babel
• Create a library build using Webpack + babel-loader

Motivation

As distributed, the original project's source files, including rook2pawn/node-easing/browser-easing.js, are not valid ES5. This leads to knock-on issues, such as when bundling the library with a tool that uses UglifyJS:

Error from UglifyJS Showing "Unexpected token operator «=»" in browser-easing.js

js/main-ec3d69cc.js from UglifyJs
Unexpected token operator «=», expected punc «,» [../node_modules/easing/browser-easing.js:8,0][js/main-ec3d69cc.js:28118,46]

Hence, this fork transpiles the source files to valid ES5:

• The lib folder contains individual transpiled source files
• browser-easing.js, a UMD module as before, is also transpiled

Types of Easing

Linear

For an array of 42 values that are linear,

Easing(42,'linear')

Quadratic

For an array of 100 values that are quadratic,

Easing(100,'quadratic')

Cubic

For an array of 42 cubic values,

Easing(42,'cubic')

Quartic

For an array of 1492 quartic values,

Easing(1492,'quartic')

Quintic

Easing(25,'quintic')

Sinusoidal

Easing(333,'sinusoidal')
Easing(333,'sin')

Circular

Easing(314,'circular')

Exponential

Easing(81,'exponential')

options

endToEnd

If we wanted to go from 0 to 1 back to 0 quadratically, simply call

Easing(100,'quadratic',{endToEnd:true});

invert

If we want to go from 1 to 0 (or 1 to 0 back to 1) instead of 0 to 1, say 'linear' style, simply call

Easing(100,'linear',{invert:true});

You can mix and match these options.

additional interfaces

Event interface

    const Easing = require('easing')
    const x = Easing.event(11,'linear')
    x.on('data', (data) => { ... })

Stream interface

    const Easing = require('easing')
    const x = Easing.stream(11,'linear')
    x.pipe(process.stdout)

These two interfaces have their own options duration and repeat that you can also mix and match.

These two interfaces can take one or all of these options

• invert : boolean
• endToEnd : boolean
• duration : integer (milliseconds, defaults to 1000)
• repeat : boolean (default false)

LICENSE

MIT