:rainbow: A JavaScript library for smooth color transitions
A JavaScript library for smoother color transitions. Project page lives here.
sweep.js is a small JavaScript library (5kb zipped) that enables proper color transitions through the HSL and HSLuv spaces. Ordinary CSS transitions or existing frameworks convert HSL colors to RGB before transitioning. sweep.js addresses this by letting you transition through the color spectrum.
I've written an in-depth post about the need for HSL transitions here.
bower install -S sweep
...or just download it from here.
Sweep's dependencies are bundled; all you have to do is include the script.
Sweep is wrapped with UMD, so it'll also work as a module in your system of choice.
Using sweep.js to transition an element's color is easy. Whenever you want to trigger an HSL sweep, call:
sweep(targets, properties, fromColor, toColor[, options])
targets- element or array of elements that you wish to animate
properties- CSS properties that you wish to animate on those targets (string or array of strings)
fromColor- initial color before the transition
toColor- final color after the transition
options(optional) - an object that can set the following:
callback- function to be called once the animation finishes
direction- clockwise (1) or counterclockwise (-1)
duration- time (in ms) to complete the animation
space- 'HSL', 'HSLuv', or 'RGB'
Trigger a full color cycle on click:
//clickvar ex1 = document.querySelector('#ex1'); ex1.addEventListener('click', function() { sweep(ex1, 'backgroundColor', '#a8f', '#a8f', {direction: -1, duration: 2000}); }, false);
Animate from purple to green on hover:
//hovervar ex2 = document.querySelector('#ex2');
ex2.addEventListener('mouseenter', function() { sweep(ex2, 'backgroundColor', getStyle(ex2, 'background-color'), '#0fa'); }, false);
ex2.addEventListener('mouseleave', function() { sweep(ex2, 'backgroundColor', getStyle(ex2, 'background-color'), '#a8f'); }, false);
Licensed under MIT. Created by rileyjshaw.