MiaoDaren/assets/scripts/RandomUtils.js

var t = require;
var e = module;
var i = exports;
Object.defineProperty(i, "__esModule", {value: !0}),
    (i.default = class {
        limit(t, e) {
            e -= t;
            return t + Math.random() * e;
        }
        limitInteger(t, e) {
            return Math.floor(this.limit(t, e + 1));
        }
        randomArray(t) {
            return t[Math.floor(Math.random() * t.length)];
        }
        shuffle(e) {
            for (let t = e.length - 1; 0 <= t; t--) {
                var i = Math.floor(Math.random() * (t + 1)),
                    s = e[i];
                (e[i] = e[t]), (e[t] = s);
            }
            return e;
        }
        randomArrayByWeight(e, i) {
            var s = e.length;
            if (!i) for (let t = (i = 0); t < s; t++) i += e[t].weight;
            let o = Math.random() * i;
            for (let t = 0; t < s; t++) if ((o -= e[t].weight) <= 0) return e[t];
        }
        judgeSpecialRandom(t, e) {
            e = s.P2C(e);
            return Math.random() < e * (t + 1);
        }
    });
var n = {};
class s {
    constructor(t, e) {
        (this.times = e = void 0 === e ? 0 : e), (this.c = 0), (this.c = s.P2C(t));
    }
    draw() {
        this.times++;
        var t = Math.random() < this.times * this.c;
        return t && (this.times = 0), t;
    }
    static P2C(t) {
        if (n[t]) return n[t];
        if (t <= 0) return 0;
        for (var e = 0, i = 0, s = t, o = 0; ; ) {
            var a = this.C2P((o = (s + e) / 2));
            if (Math.abs(a - i) <= 1e-14) break;
            t < a ? (s = o) : (e = o), (i = a);
        }
        return (n[t] = o);
    }
    static C2P(t) {
        for (var e, i = 0, s = 0, o = Math.ceil(1 / t), a = 1; a <= o; a++)
            (s += e = (1 - s) * Math.min(1, t * a)), (i += e * a);
        return 1 / i;
    }
}