Terminal 2D Noise

terminal-noise.js

function base(n) {
        return Math.pow(2, n) + 1;
}

function find(x, n) {
        let b = 2;
        let i = 0;
        while(x > b) {
                b = base(i + 1);
                i++;
        }
        return base(i - n);
}

function make(x, n) {
        for(let i = 0; i < n; i++) {
                x += x - 1;
        }
        return x;
}

function noise(length, depth) {
        const array = Array.from({ length }).map(() => Math.random());
        for(let i = 0; i < depth; i++) {
                expand(array);
        }
        return array;
}

function noise2D(length, depth) {
        let array = Array.from({ length }).map(() => Array.from({ length }).map(() => Math.random()));
        for(let i = 0; i < depth; i++) {
                for(let i = 0; i < array.length; i++) {
                        expand(array[i]);
                }
                expand2D(array);
        }
        return array;
}

function expand(array) {
        for(let i = 1; i < array.length; i += 2) {
                const min = Math.min(array[i], array[i - 1]);
                const max = Math.max(array[i], array[i - 1]);
                array.splice(i, 0, Math.random() * (max - min) + min);
        }
}

function expand2D(array) {
        for(let i = 1; i < array.length; i += 2) {
                const row = [];
                for(let j = 0; j < array[i].length; j++) {
                        const min = Math.min(array[i][j], array[i - 1][j]);
                        const max = Math.max(array[i][j], array[i - 1][j]);
                        row.push(Math.random() * (max - min) + min);
                }
                array.splice(i, 0, row);
        }
}

const [x = 16, n = 2] = Deno.args;
const k = find(x, n);
console.log(`${x}x${x} : ${n}`);

const a = noise2D(k, n).slice(0, x).map(n => n.slice(0, x));
let s = '';
for(let i = 0; i < a.length; i++) {
        for(let j = 0; j < a[i].length; j++) {
                s += `\u001b[48;5;${240 + Math.floor(15 * a[i][j])}m  `;
        }
        s += '\u001b[0m\n';
}
s += '\u001b[0m';
console.log(s);