element-web-Github/src/VelocityBounce.js
David Baker aca0e060a4 Also change velocity-vector commit & requires
Because it needs a versiob where the package name is actually updated and the requires need to use the right package name
2016-06-07 20:47:37 +01:00

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487 B
JavaScript

var Velocity = require('velocity-vector');
// courtesy of https://github.com/julianshapiro/velocity/issues/283
// We only use easeOutBounce (easeInBounce is just sort of nonsensical)
function bounce( p ) {
var pow2,
bounce = 4;
while ( p < ( ( pow2 = Math.pow( 2, --bounce ) ) - 1 ) / 11 ) {}
return 1 / Math.pow( 4, 3 - bounce ) - 7.5625 * Math.pow( ( pow2 * 3 - 2 ) / 22 - p, 2 );
}
Velocity.Easings.easeOutBounce = function(p) {
return 1 - bounce(1 - p);
}