121 lines
2.7 KiB
JavaScript
121 lines
2.7 KiB
JavaScript
let drawing = 1;
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const form = Array.from(document.forms.rules.elements);
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const canvas = document.querySelector('#canvas');
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const ctx = canvas.getContext('2d');
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const main = document.querySelector('#main');
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const dead = document.querySelector('#dead');
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const live = document.querySelector('#live');
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const startBtn = document.querySelector('#start');
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const resetBtn = document.querySelector('#reset');
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const cellSize = document.querySelector('#cellSize');
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const loop = document.querySelector('#loop');
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canvas.width = main.offsetWidth;
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canvas.height = main.offsetHeight;
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// TODO: Hide iterator inside
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function evolve(state, acc, rules) {
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const [x, y, z, ...xs] = state;
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if (!xs.length) {
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return acc[acc.length - 1] + acc + acc[0];
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}
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const rule = x + y + z;
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const newAcc = acc.concat(rules[rule]);
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return evolve(y + z + xs.join(''), newAcc, rules);
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}
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function getRules() {
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const rules = {};
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form.reduce((_, i) => {
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if (i !== undefined
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&& i.type === 'checkbox') {
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if (i.checked) rules[i.name] = '1';
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else rules[i.name] = '0';
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}
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return rules;
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}, rules);
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return rules;
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}
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function getDrawingValues(state, acc) {
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const cellDim = cellSize.value;
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return Object.keys(state).map(
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(key) => {
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const fillStyle = state[key] === '1' ? live.value : dead.value;
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return {
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move: [key * cellDim, acc * cellDim],
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fill: [key * cellDim, acc * cellDim, cellDim, cellDim],
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fillStyle,
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};
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},
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);
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}
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function getRandomInt(min, max) {
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const minVal = Math.ceil(min);
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const maxVal = Math.floor(max);
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// The maximum is exclusive and the minimum is inclusive
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return Math.floor(Math.random() * (maxVal - minVal) + minVal);
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}
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async function sleep(ms) {
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await new Promise((resolve) => setTimeout(resolve, ms));
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}
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async function draw(state, acc) {
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if (drawing === 0) {
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return;
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}
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const position = acc * cellSize.value;
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if (position >= canvas.height && !loop.checked) return;
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const rules = getRules();
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const newState = evolve(state, '', rules);
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const line = getDrawingValues(newState, acc);
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line.map((cell) => {
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ctx.moveTo(...cell.move);
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ctx.fillRect(...cell.fill);
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ctx.fillStyle = cell.fillStyle;
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return cell;
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});
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await sleep(40);
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const newAcc = () => {
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if (position >= canvas.height && loop.checked) return 1;
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return acc;
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};
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await draw(newState, newAcc() + 1);
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}
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function reset() {
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drawing = 0;
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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}
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startBtn.addEventListener('click', async () => {
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reset();
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await sleep(60);
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drawing = 1;
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const initialState = [...Array(canvas.width)].map(
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() => getRandomInt(0, 2).toString(),
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).join('');
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draw(initialState, 1);
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});
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resetBtn.addEventListener('click', async () => {
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reset();
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});
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