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life.html
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life.html
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<html>
<head><title>Conway's Game of Life</title>
<style>
section {
display: grid;
grid-template-columns: repeat(40, 12px);
grid-template-rows: repeat(40, 12px);
cursor: pointer;
}
div {
width: 10px;
height: 10px;
background: lightgrey;
}
div.life1 { background: #229922; }
div.life2 { background: #227722; }
div.life3 { background: #225522; }
div.life4 { background: #223322; }
div.life5 { background: #324422; }
div.life6 { background: #424422; }
div.life7 { background: #424311; }
div.life8 { background: #624211; }
div.life9 { background: #524B00; }
button {margin: 10px;}
</style>
</head>
<body>
<span id="msg">Conway's Game of Life</span>
<section>
<!-- 40x40 empty div elements will be added here. -->
</section>
<p>Click and drag to draw.</p>
<button id="play-pause">Play</button>
<button id="clear">Clear</button>
<script>
const boardSize = 40;
// Create the HTML elmements
let sectionEl = document.querySelector("section");
for (let r=0; r<boardSize; r++)
for (let c=0; c<boardSize; c++) {
let newDiv = document.createElement('div');
newDiv.dataset.r = r;
newDiv.dataset.c = c; sectionEl.appendChild(newDiv);
}
let pixels = document.querySelectorAll('section div');
let running = false;
// Board is 24x24 matrix of pixels that start false
let board = [];
function initializeBoard() {
board = [];
for (let r=0; r<boardSize; r++) {
let row = [];
board.push(row);
for (let c=0; c<boardSize; c++) {
row.push(0);
}
}
}
function render() {
let i = 0;
for (pixel of pixels) {
let r = Math.floor(i / boardSize);
let c = i % boardSize
pixel.className = 'life' + board[r][c];
i++;
}
}
function clear() {
initializeBoard();
render();
}
clear();
function playPause() {
if (running) {
running = false;
// cancel
document.querySelector('#play-pause').innerText = 'Play';
} else {
running = true;
document.querySelector('#play-pause').innerText = 'Pause';
}
}
// Based on http://rosettacode.org/wiki/Conway%27s_Game_of_Life#JavaScript
function update() {
let boardNext = new Array(board.length);
for (var i = 0; i < board.length; i++) {
boardNext[i] = new Array(board[i].length);
}
for (var x = 0; x < board.length; x++) {
for (var y = 0; y < board[x].length; y++) {
var n = 0;
for (var dx = -1; dx <= 1; dx++) {
for (var dy = -1; dy <= 1; dy++) {
if ( dx == 0 && dy == 0){}
else if (typeof board[x+dx] !== 'undefined'
&& typeof board[x+dx][y+dy] !== 'undefined'
&& board[x+dx][y+dy]) {
n++;
}
}
}
var age = board[x][y];
switch (n) {
case 0:
case 1:
age = 0;
break;
case 2:
if (age) age = Math.min(age + 1, 9);
break;
case 3:
age = Math.min(age + 1, 9);
break;
default:
age = 0;
}
boardNext[x][y] = age;
}
}
board = boardNext.slice();
}
function gameLoop() {
if (!running) return;
update();
render();
}
window.setInterval(gameLoop, 100);
document.querySelector('#clear').addEventListener('click', clear);
document.querySelector('#play-pause').addEventListener('click', playPause);
let drawingMode = 1;
function draw(pixel) {
let r = Number(pixel.dataset.r);
let c = Number(pixel.dataset.c);
board[r][c] = drawingMode;
render();
}
function startDrawing(pixel) {
drawingMode = (pixel.className == 'life0') ? 1 : 0;
draw(pixel);
}
pixels.forEach((pixel => {
pixel.addEventListener(
'mousedown', (e) => {
startDrawing(e.target);
});
pixel.addEventListener(
'mouseenter', (e) => {
if (e.buttons) draw(e.target);
});
}));
</script>
</body>
</html>