primer-js
v1.0.1
Published
An animation timeline library
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primer-js
primer-js is a tiny (474 bytes minified + gzipped) library for creating normalised, unit independent timelines, for use in programatic animation.
API
Example
const {timeline, timelineEvent} = require('primer-js');
const tl = timeline([
// event "a" has a duration of 100 time units
timelineEvent("a", { duration: 100 }),
// event "b" lasts for 300 time units, but is delayed by 200
timelineEvent("b", { duration: 300, preWait: 200 }),
// event "c" last for 200 time units, and uses a custom expoential easing function
timelineEvent("c", { duration: 200, ease: x => x**2 }),
]);
// Begin the timeline at t=0
tl.init(0);
// draw function is called with a a time in milleseconds as often as possible
const draw = t => {
tl.update(t);
// The values the timeline produces are always normalised to the inclusive range [0, 1]
const someOpacityValue = tl.get("b").value();
};