LabyStudio
32 lines
829 B
JavaScript
32 lines
829 B
JavaScript
export default class Random {
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static instances = 0;
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constructor(seed = Date.now() % 1000000000 ^ Random.instances++ * 1000) {
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this.mask = 0xffffffff;
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this.setSeed(seed);
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}
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nextBoolean() {
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return this.nextFloat() > 0.5;
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}
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nextInt(max = 0x7fffffff) {
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return Math.floor(this.nextFloat() * (max + 1));
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}
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nextFloat() {
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this.m_z = (36969 * (this.m_z & 65535) + (this.m_z >>> 16)) & this.mask;
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this.m_w = (18000 * (this.m_w & 65535) + (this.m_w >>> 16)) & this.mask;
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let result = ((this.m_z << 16) + (this.m_w & 65535)) >>> 0;
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result /= 4294967296;
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return result;
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}
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setSeed(seed) {
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this.seed = seed;
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this.m_w = (123456789 + seed) & this.mask;
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this.m_z = (987654321 - seed) & this.mask;
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}
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} |