bd028579
 易尊强
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import { cubicAt, cubicRootAt } from '../core/curve';
import { trim } from '../core/util';
const regexp = /cubic-bezier\(([0-9,\.e ]+)\)/;
export function createCubicEasingFunc(cubicEasingStr: string) {
const cubic = cubicEasingStr && regexp.exec(cubicEasingStr);
if (cubic) {
const points = cubic[1].split(',');
const a = +trim(points[0]);
const b = +trim(points[1]);
const c = +trim(points[2]);
const d = +trim(points[3]);
if (isNaN(a + b + c + d)) {
return;
}
const roots: number[] = [];
return (p: number) => {
return p <= 0
? 0 : p >= 1
? 1
: cubicRootAt(0, a, c, 1, p, roots) && cubicAt(0, b, d, 1, roots[0]);
};
}
}
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