@haiku/player/lib/vendor/just-curves/internal/cubicBezier.js

Haiku Player is a JavaScript library for building user interfaces

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var math_1 = require("./math");
var constants_1 = require("./constants");
var bezier = function (n1, n2, t) {
    return 3 * n1 * (1 - t) * (1 - t) * t + 3 * n2 * (1 - t) * t * t + t * t * t;
};
exports.cubicBezier = function (p0, p1, p2, p3) {
    if (p0 < 0 || p0 > 1 || p2 < 0 || p2 > 1) {
        return function (x) { return x; };
    }
    return function (x) {
        if (x === 0 || x === 1) {
            return x;
        }
        var start = 0;
        var end = 1;
        var limit = 19;
        do {
            var mid = (start + end) * .5;
            var xEst = bezier(p0, p2, mid);
            if (math_1.abs(x - xEst) < constants_1.epsilon) {
                return bezier(p1, p3, mid);
            }
            if (xEst < x) {
                start = mid;
            }
            else {
                end = mid;
            }
        } while (--limit);
        return x;
    };
};
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