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46 lines
1.1 KiB
46 lines
1.1 KiB
3 weeks ago
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/** 可复现随机数（对战同步 / 回放） */
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export class SeededRNG {
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private _state: number;
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/**
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* @param seed 随机种子，默认 Date.now()
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*/
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constructor(seed: number = Date.now()) {
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this._state = seed >>> 0;
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}
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/** @returns [0, 1) 均匀随机数 */
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next(): number {
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this._state = (1664525 * this._state + 1013904223) >>> 0;
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return this._state / 0x100000000;
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}
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/**
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* @param min 下界（含）
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* @param max 上界（不含）
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* @returns 均匀随机浮点数
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*/
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range(min: number, max: number): number {
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return min + this.next() * (max - min);
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}
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/**
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* @param min 下界（含）
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* @param max 上界（含）
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* @returns 均匀随机整数
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*/
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int(min: number, max: number): number {
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return Math.floor(this.range(min, max + 1));
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}
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/** 导出 RNG 内部状态（战斗快照） */
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getState(): number {
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return this._state;
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}
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/** 恢复 RNG 内部状态 */
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setState(state: number): void {
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this._state = state >>> 0;
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}
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}
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