52 lines
1.4 KiB
JavaScript
52 lines
1.4 KiB
JavaScript
/**
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* @module prng
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*/
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import { Mt19937 } from './Mt19937.mjs'
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import { Xoroshiro128plus } from './Xoroshiro128plus.mjs'
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import { Xorshift32 } from './Xorshift32.mjs'
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import * as time from '../../time.mjs'
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const DIAMETER = 300
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const NUMBERS = 10000
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const runPRNG = (name, Gen) => {
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console.log('== ' + name + ' ==')
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const gen = new Gen(1234)
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let head = 0
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let tails = 0
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const date = time.getUnixTime()
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const canvas = document.createElement('canvas')
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canvas.height = DIAMETER
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canvas.width = DIAMETER
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const ctx = canvas.getContext('2d')
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const vals = new Set()
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ctx.fillStyle = 'blue'
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for (let i = 0; i < NUMBERS; i++) {
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const n = gen.next() & 0xFFFFFF
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const x = (gen.next() >>> 0) % DIAMETER
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const y = (gen.next() >>> 0) % DIAMETER
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ctx.fillRect(x, y, 1, 2)
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if ((n & 1) === 1) {
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head++
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} else {
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tails++
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}
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if (vals.has(n)) {
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console.warn(`The generator generated a duplicate`)
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}
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vals.add(n)
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}
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console.log('time: ', time.getUnixTime() - date)
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console.log('head:', head, 'tails:', tails)
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console.log('%c ', `font-size: 200px; background: url(${canvas.toDataURL()}) no-repeat;`)
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const h1 = document.createElement('h1')
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h1.insertBefore(document.createTextNode(name), null)
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document.body.insertBefore(h1, null)
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document.body.appendChild(canvas)
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}
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runPRNG('mt19937', Mt19937)
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runPRNG('xoroshiro128plus', Xoroshiro128plus)
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runPRNG('xorshift32', Xorshift32)
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