image-in-browser/lib/common/random-utils.js

Package for encoding / decoding images, transforming images, applying filters, drawing primitives on images on the client side (no need for server Node.js)

export class RandomUtils {
    static crand() {
        return 1 - 2 * Math.random();
    }
    static grand() {
        let x1 = 0;
        let w = 0;
        do {
            const x2 = 2 * Math.random() - 1;
            x1 = 2 * Math.random() - 1;
            w = x1 * x1 + x2 * x2;
        } while (w <= 0 || w >= 1);
        return x1 * Math.sqrt((-2 * Math.log(w)) / w);
    }
    static prand(z) {
        if (z <= 1e-10) {
            return 0;
        }
        if (z > 100) {
            return Math.trunc(Math.sqrt(z) * RandomUtils.grand() + z);
        }
        let k = 0;
        const y = Math.exp(-z);
        for (let s = 1.0; s >= y; ++k) {
            s *= Math.random();
        }
        return k - 1;
    }
    static intrand(max) {
        return Math.floor(Math.random() * max);
    }
}
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