Easing functions for JavaScript

Installation

Using

• npm: npm install feasing. See below an example using require.
• directly: download the archive from releases and include src/main/js/feasing.js

This can be used either from a browser or on the server side.

API

Easing

• constructor new Easing(startValue, endValue, startTime, endTime, easingFunction)
• startValue the value associated with startTime
• endValue the value associated with endTime
• startTime the value of the first moment in change. It could be seconds, milliseconds, whatever, but you must keep it consistent.
• endTime the value of the first moment in change.
• easingFunction must be one of Easing.linear, Easing.linearTween, Easing.easeInQuad, Easing.easeOutQuad, Easing.easeInOutQuad, Easing.easeInCubic, Easing.easeOutCubic, Easing.easeInOutCubic, Easing.easeInQuart, Easing.easeOutQuart, Easing.easeInOutQuart, Easing.easeInQuint, Easing.easeOutQuint, Easing.easeInOutQuint, Easing.easeInSine, Easing.easeOutSine, Easing.easeInOutSine, Easing.easeInExpo, Easing.easeOutExpo, Easing.easeInOutExpo, Easing.easeInCirc, Easing.easeOutCirc, Easing.easeInOutCirc
• .getValue(time)
• returns the corresponding value for the given time. Time must be between startTime and endTime.

Example

var Easing = require("feasing");
// First create the easing function
var easing = new Easing(0, 100, 0, 1000, Easing.linear);
// get the value for the mid-time
var midValue = easing.getValue(500);

Testing

The testing is done using Jasmine. To run the tests just run npm test or jasmine.

How to make a new release

1. Change the version number in bower.json and package.json (if not already changed - check the version number against the latest release in Github)
2. Create a new release in github with the same name for tag and title as the version number (e.g. 1.0.0). Do not forget to include the changelog in the release description.
3. Run npm publish to publish the new version to npm

License

MIT