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65 lines
1.0 KiB
TypeScript
65 lines
1.0 KiB
TypeScript
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export interface RNG {
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random(): number;
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}
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/*
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* very bad RNG, meant to be used as introduction to RNG manipulation. It has a
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* period of 1024.
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*/
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class RNG0 implements RNG {
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x: number;
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m = 1024;
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a = 341;
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c = 1;
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constructor() {
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this.x = 0;
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this.reset();
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}
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step(): void {
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this.x = (this.a*this.x+this.c) % this.m;
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}
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random(): number {
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this.step();
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return this.x/this.m;
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}
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reset(): void {
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this.x = (new Date()).getTime() % this.m;
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}
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}
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export const BadRNG: RNG0 = new RNG0();
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/*
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* Wichmann–Hill PRNG
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* The period is 6e12.
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*/
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export class WHRNG implements RNG {
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s1 = 0;
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s2 = 0;
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s3 = 0;
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constructor(totalPlaytime: number) {
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// This one is seeded by the players total play time.
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const v: number = (totalPlaytime/1000)%30000;
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this.s1 = v;
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this.s2 = v;
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this.s3 = v;
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}
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step(): void {
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this.s1 = (171 * this.s1) % 30269;
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this.s2 = (172 * this.s2) % 30307;
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this.s3 = (170 * this.s3) % 30323;
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}
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random(): number {
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this.step();
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return (this.s1/30269.0 + this.s2/30307.0 + this.s3/30323.0)%1.0;
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}
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}
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