Fixed GameOfLife post
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Marcus Noble
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249
src/pages/ConwaysGameOfLife.md
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249
src/pages/ConwaysGameOfLife.md
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---
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layout: page.html
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title: "Conways Game Of Life"
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---
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<style type="text/css">
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* {
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box-sizing:border;
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}
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body{
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text-align:center;
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}
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#gameBoard {
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margin: 0 auto;
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border:2px solid #ccc;
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line-height:10px;
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display:table;
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}
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.cell {
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width:10px;
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height:10px;
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display:inline-block;
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border:1px solid #ccc;
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}
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.row {
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display:block;
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margin:0;
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}
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</style>
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<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
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<div id="gameBoard"></div>
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<p>
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Read my blog post regarding <a href="14-07-2014-conways-game-of-life/">Conway's Game of Life</a>
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</p>
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<script type="text/javascript">
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(function(){
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var cells = [];
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var boardWidth = 20;
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var boardHeight = 20;
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var $board = $('#gameBoard');
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var intervalID;
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var gameOverBoard = [
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{x:2,y:4},
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{x:2,y:5},
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{x:2,y:6},
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{x:3,y:3},
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{x:4,y:3},
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{x:3,y:7},
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{x:4,y:7},
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{x:4,y:5},
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{x:5,y:5},
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{x:5,y:6},
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{x:7,y:4},
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{x:7,y:5},
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{x:7,y:6},
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{x:7,y:7},
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{x:8,y:3},
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{x:9,y:3},
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{x:8,y:5},
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{x:9,y:5},
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{x:10,y:4},
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{x:10,y:5},
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{x:10,y:6},
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{x:10,y:7},
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{x:12,y:4},
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{x:12,y:5},
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{x:12,y:6},
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{x:12,y:7},
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{x:13,y:3},
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{x:14,y:4},
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{x:15,y:3},
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{x:16,y:4},
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{x:16,y:5},
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{x:16,y:6},
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{x:16,y:7},
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{x:18,y:3},
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{x:18,y:4},
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{x:18,y:5},
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{x:18,y:6},
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{x:18,y:7},
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{x:19,y:3},
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{x:19,y:5},
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{x:19,y:7},
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{x:3,y:9},
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{x:4,y:9},
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{x:2,y:10},
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{x:2,y:11},
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{x:2,y:12},
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{x:3,y:13},
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{x:4,y:13},
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{x:5,y:10},
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{x:5,y:11},
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{x:5,y:12},
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{x:7,y:9},
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{x:7,y:10},
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{x:8,y:11},
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{x:8,y:12},
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{x:9,y:13},
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{x:10,y:12},
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{x:10,y:11},
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{x:11,y:10},
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{x:11,y:9},
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{x:13,y:9},
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{x:13,y:10},
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{x:13,y:11},
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{x:13,y:12},
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{x:13,y:13},
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{x:14,y:9},
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{x:14,y:11},
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{x:14,y:13},
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{x:16,y:9},
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{x:16,y:10},
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{x:16,y:11},
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{x:16,y:12},
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{x:16,y:13},
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{x:17,y:9},
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{x:17,y:11},
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{x:18,y:9},
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{x:18,y:11},
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{x:18,y:12},
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{x:19,y:10},
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{x:19,y:13}
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];
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function init(){
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var cell = $('<div/>').addClass('cell');
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var row = $('<div/>').addClass('row');
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var currentRow, i, j, newCell;
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$('#gameBoard').empty().on('click', function(){
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clearInterval(intervalID);
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init();
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});
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cells = [];
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for(i=0;i<boardHeight;i++){
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currentRow = row.clone();
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$board.append(currentRow);
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for(j=0;j<boardHeight;j++){
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currentRow.append(cell.clone());
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}
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}
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for(i=0;i<50;i++){
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newCell = {
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x: (Math.floor(Math.random() * (boardWidth - 1) + 1)),
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y: (Math.floor(Math.random() * (boardHeight - 1) + 1))
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};
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cells.push(newCell)
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}
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render();
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intervalID = setInterval(function(){
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tick();
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}, 1000);
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}
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function render(){
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$board.find('.cell').css('background','white');
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for(var i=0; i<cells.length;i++){
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$($($('.row').get(cells[i].y-1)).find('.cell').get(cells[i].x-1)).css('background', 'black');
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}
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}
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function tick(){
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var neighbourCount = 0;
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var nextIteration = [];
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var candidates = [];
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var neighbours, i, j,
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cellX, cellY,
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cellLength, neighbourLength, candidateLength;
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// All cells are dead, lets restart
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if(cells.length === 0){
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clearInterval(intervalID);
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//Game over, restart in 5sec
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cells = gameOverBoard;
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render();
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setTimeout(function(){
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init();
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}, 5000);
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return;
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}
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for(i=0, cellLength=cells.length; i<cellLength; i++){
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neighbourCount = countNeighbours(cells[i]);
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if(neighbourCount >= 2 && neighbourCount <= 3){
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nextIteration.push(cells[i]);
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}
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// For each cell that is alive, find its neighbours
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cellX = cells[i].x;
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cellY = cells[i].y;
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neighbours = [];
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neighbours.push({x:(cellX-1),y:(cellY-1)});
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neighbours.push({x:(cellX-1),y:cellY});
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neighbours.push({x:(cellX-1),y:(cellY+1)});
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neighbours.push({x:cellX,y:(cellY-1)});
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neighbours.push({x:cellX,y:(cellY+1)});
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neighbours.push({x:(cellX+1),y:(cellY-1)});
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neighbours.push({x:(cellX+1),y:cellY});
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neighbours.push({x:(cellX+1),y:(cellY+1)});
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for(j=0, neighbourLength=neighbours.length; j<neighbourLength; j++){
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// Keep the neighbour cells if they are dead
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// We don't want to keep multiple copies of the neighbour cell
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if(!isAlive(neighbours[j]) && candidates.filter(function(currentCell){
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return (currentCell.x === neighbours[j].x && currentCell.y == neighbours[j].y);
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}).length === 0) {
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candidates.push(neighbours[j]);
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}
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}
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}
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// Now we have a list of dead neighbours of at least 1 live neighbour (candidates)
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// Bring the cell to life if we find that each neighbour has 3 other live neighbouring cells
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for(i=0, candidateLength=candidates.length; i<candidateLength; i++){
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if(countNeighbours(candidates[i]) === 3){
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nextIteration.push(candidates[i]);
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}
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}
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cells = nextIteration;
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render();
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}
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function isAlive(cell){
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return (cells.filter(function(currentCell){
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return (currentCell.x === cell.x && currentCell.y === cell.y);
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}).length > 0);
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}
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function countNeighbours(cell){
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var x1 = cell.x-1,
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x2 = cell.x+1,
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y1 = cell.y-1,
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y2 = cell.y+1;
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var neighbours = cells.filter(function(possibleNeighbour){
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if(possibleNeighbour.x === cell.x && possibleNeighbour.y === cell.y){
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return false;
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}
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return (possibleNeighbour.x >= x1 && possibleNeighbour.x <= x2 && possibleNeighbour.y >= y1 && possibleNeighbour.y <= y2);
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});
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return neighbours.length;
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}
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init();
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}());
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</script>
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@ -18,9 +18,13 @@ Conway's Game of Life is a 0-player turn based simulation of life. The "game" fo
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The rules of the game are as follows:
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<blockquote markdown="1">
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* Any live cell with fewer than two live neighbours dies, as if caused by under-population.
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* Any live cell with two or three live neighbours lives on to the next generation.
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* Any live cell with more than three live neighbours dies, as if by overcrowding.
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* Any dead cell with exactly three live neighbours becomes a live cell, as if by reproduction.
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<cite>Wikipedia - http://en.wikipedia.org/wiki/Conway's_Game_of_Life</cite>
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@ -67,8 +71,8 @@ This is the approach I used last night. I have struggled on effectively calculat
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# Final Code
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<figure class="center" markdown="1">
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<a href="/ConwaysGameOfLife.html">
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<a href="{{ site.url }}/Conways-Game-Of-Life" target="_blank">
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<img src="{{site.url}}/images/conways-game-of-life.PNG" alt="Conway's Game of Life">
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</a>
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<figcaption>They LIVE!!!</figcaption>
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</figure>
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@ -178,7 +182,7 @@ init();
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</code></pre>
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You can check out the [final version](/ConwaysGameOfLife.html) or take a look at the [gist](https://gist.github.com/AverageMarcus/f5e34825ef89e11443be).
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You can check out the [final version](/Conways-Game-Of-Life) or take a look at the [gist](https://gist.github.com/AverageMarcus/f5e34825ef89e11443be).
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As always, if you have any comments <a href="https://twitter.com/intent/tweet?screen_name=Marcus_Noble_" class="twitter-contact-link" data-related="Marcus_Noble_" data-dnt="true" target="_blank"><i class="icon-twitter"></i>Tweet @Marcus\_Noble_</a>.
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@ -309,4 +313,4 @@ function countNeighbours(cell){
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}
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init();
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</code></pre>
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</code></pre>
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