bd028579
 易尊强
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import { cubicAt, cubicRootAt } from '../core/curve.js';
import { trim } from '../core/util.js';
var regexp = /cubic-bezier\(([0-9,\.e ]+)\)/;
export function createCubicEasingFunc(cubicEasingStr) {
var cubic = cubicEasingStr && regexp.exec(cubicEasingStr);
if (cubic) {
var points = cubic[1].split(',');
var a_1 = +trim(points[0]);
var b_1 = +trim(points[1]);
var c_1 = +trim(points[2]);
var d_1 = +trim(points[3]);
if (isNaN(a_1 + b_1 + c_1 + d_1)) {
return;
}
var roots_1 = [];
return function (p) {
return p <= 0
? 0 : p >= 1
? 1
: cubicRootAt(0, a_1, c_1, 1, p, roots_1) && cubicAt(0, b_1, d_1, 1, roots_1[0]);
};
}
}
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