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