@patreon/studio
Version:
Patreon Studio Design System
40 lines (35 loc) • 1.66 kB
JavaScript
/*
Pulled from d3-interpolate:
https://github.com/d3/d3-interpolate/blob/main/src/basis.js
Copyright 2010-2021 Mike Bostock
Permission to use, copy, modify, and/or distribute this software for any purpose
with or without fee is hereby granted, provided that the above copyright notice
and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
THIS SOFTWARE.
*/
export function basis(t1, v0, v1, v2, v3) {
const t2 = t1 * t1;
const t3 = t2 * t1;
return (((1 - 3 * t1 + 3 * t2 - t3) * v0 + (4 - 6 * t2 + 3 * t3) * v1 + (1 + 3 * t1 + 3 * t2 - 3 * t3) * v2 + t3 * v3) / 6);
}
export function bcurve(values) {
const n = values.length - 1;
return function (t) {
const i = t <= 0 ? (t = 0) : t >= 1 ? ((t = 1), n - 1) : Math.floor(t * n);
const v1 = values[i];
const v2 = values[i + 1];
const v0 = i > 0 ? values[i - 1] : 2 * v1 - v2;
const v3 = i < n - 1 ? values[i + 2] : 2 * v2 - v1;
const res = basis((t - i / n) * n, v0, v1, v2, v3);
// round to 3 decimal places
return Math.round(res * 1000) / 1000;
};
}
export const customCurve = bcurve([0, 0.22, 0.44, 0.66, 0.88, 1]);
//# sourceMappingURL=bezier.js.map