Lightweight JavaScript (ES6) tweening library.

EXAMPLES

• Examples collection

DOCUMENTATION

• Purpose
• Install
  • With npm
  • Or fetch from CDN
• Basic usage
  • Module
  • Or in HTML:
• API
• Events
• Different values
• Looping
• Easing
• Color
• Mixed examples

Purpose

Make tweening usage convenient and powerful. There are certain things that we were following while developed this library, we wanted to make it:

• Lightweight :snowflake: JS Tweening library.

The library is only 8.3 Kb (3Kb gzip)

• Performant :zap: JS Tweening library.

It uses optimization patterns to speed up & smooth animation.

• Modern :gem: JS Tweening library

The library is written in ES6, compiled to ES5 for global browsers support and provides ES6 API.

Install

With npm

$ npm install between.js

Or fetch from CDN

<script src="https://rawgit.com/sasha240100/between.js/master/build/between.js"></script>

Basic usage

Module

import Between from 'between.js';

// new Between(from, to).time(duration)
new Between(1, 10).time(1000)
  .on('update', (value) => { // This callback is executed in every frame
      console.log(value);
  });

Or in HTML:

<script src="./path/to/between.js"></script>
<script>
  new Between(1, 10).time(1000)
    .on('update', (value) => {
        console.log(value);
    });
</script>

API

// Constructor
new Between(
 [Number|Object|Array] from, 
 [Number|Object|Array] to
)

// Methods
  .time([Number] duration) // Set duration
  .loop([String] mode, [?Number] repeatTimes) // Set loop mode, if "repeatTimes" is falsy, treats as "endless"
  .easing([Function] easing) // Set easing function
  .on([String] eventName, [Function] callback) // Add event listener
  .pause() // Pauses
  .play() // Resumes

// Getters
  .isPaused // returns true if paused

There is no need to "start" the tween. It is executed immediately once it was created.

Events

import Between from 'between.js';

new Between(1, 10).time(1000)
  .on('update', (value) => {
      console.log(value); 
  })
  .on('start', (value) => {
      console.log(value);
  })
  .on('pause', (value) => {
      console.log(value); 
  })
  .on('play', (value) => {
      console.log(value);
  })
  .on('complete', (value) => {
      console.log(value);
  });

Different values

• Numbers
• Arrays
• Objects

Numbers

import Between from 'between.js';

new Between(1, 10).time(1000)
  .on('update', (value) => {
      console.log(value);
  });

Example

Arrays

import Between from 'between.js';

new Between([1, 5], [10, 10]).time(1000)
  .on('update', (value) => {
      console.log(value);
   });

Example

Objects

import Between from 'between.js';

new Between({x: 2, y: 3, z: 4}, {x: 4, y: 6, z: 10}).time(1000)
  .on('update', (value) => {
      console.log(value);
  });

Example

Looping

Repeat N times

import Between from 'between.js';

new Between(1, 10).time(4000)
  .loop('repeat', N)
  .on('update', (value, {times}) => {
      console.log(value);
      console.log(times);
  });

Example

Repeat endless

import Between from 'between.js';

new Between(1, 10).time(4000)
  .loop('repeat')
  .on('update', (value) => {
      console.log(value);
  });

Example

Bounce N times

import Between from 'between.js';

new Between(1, 10).time(4000)
  .loop('bounce', N)
  .on('update', (value, {times}) => {
      console.log(value);
      console.log(times);
  });

Example

Easing

import Between from 'between.js';
import Easing from 'easing-functions';

// choose easing mode frome easing-functions

new Between(1, 10).time(4000)
  .easing(Between.Easing.Cubic.InOut)
  .on('update', (value) => {
      console.log(value);
  });

Example

easing-functions npm

Color

Color types:

• HEX
• HSL
• RGB
• Words (red, yellow...)

import Between from 'between.js';
import ColorPlugin from 'between.js/build/dom-color.between.js';

Between._plugins.color = ColorPlugin;

new Between('red', 'rgb(255,40,30)').time(4000)
  .on('update', (value) => {
      console.log(value);
  });

Example

Or in HTML:

<script src="./path/to/between.js"></script>
<script src="./path/to/dom-color.between.js"></script>

Mixed examples

import Between from 'between.js';
import Easing from 'easing-functions';
import ColorPlugin from 'between.js/build/dom-color.between.js';

Between._plugins.color = ColorPlugin;

// choose easing mode frome easing-functions

new Between('red', 'rgb(255,40,30)').time(4000)
  .loop('repeat', 3)
  .easing(Between.Easing.Linear)
  .on('update', (value) => {
      console.log(value);
  });

import Between from 'between.js';
import Easing from 'easing-functions';

// choose easing mode frome easing-functions

new Between(1, 10).time(4000)
  .loop('bounce', 3)
  .easing(Between.Easing.Cubic.InOut)
  .on('update', (value) => {
      console.log(value);
  });

import Between from 'between.js';
import Easing from 'easing-functions';

// choose easing mode frome easing-functions

new Between(1, 10).time(4000)
  .loop('repeat', 4)
  .easing(Between.Easing.Elastic.In)
  .on('update', (value) => {
      console.log(value);
  })
  .on('complete', (value) => {
      console.log(value);
  });