Created
February 13, 2014 22:22
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Game of Life JavaScript Implementation
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| .grid { | |
| } | |
| .cell { | |
| background: black; | |
| float: left; | |
| box-shadow: inset 0 0 1px 0 white; | |
| } | |
| .cell.live { | |
| background: seagreen; | |
| } | |
| div { | |
| margin: 0; | |
| padding: 0; | |
| color: red; | |
| text-align: center; | |
| font-size: 80%; | |
| } |
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| <html> | |
| <head> | |
| <link rel="stylesheet" href="game.css"/> | |
| </head> | |
| <body> | |
| <script src="game.js"></script> | |
| </body> | |
| </html> |
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| var Game = {}; | |
| var log = console.log.bind(console); | |
| var logcell = function (cell) { | |
| var prefix = "cell["+cell.x+", "+cell.y+"]"; | |
| return console.log.bind(console, prefix); | |
| }; | |
| var Cell = function (x, y, status, cell_width) { | |
| this.x = x; | |
| this.y = y; | |
| this.status = status; | |
| this.el = document.createElement("div"); | |
| this.el.className = "cell"; | |
| this.el.style.height = cell_width + "px"; | |
| this.el.style.width = cell_width + "px"; | |
| this.next_status = -1; | |
| if (this.status == 1) { | |
| this.el.className += " live"; | |
| } | |
| } | |
| Cell.prototype = { | |
| set_next_status: function() { | |
| var neighbors = this.get_neighbors(); | |
| var live_count = 0; | |
| neighbors.forEach(function(n) { | |
| if (n.status == 1) {live_count ++;} | |
| }); | |
| if (this.status == 0 ) { | |
| if (live_count == 3) { | |
| this.next_status = 1; | |
| } | |
| } else if (live_count < 2 || live_count > 3) { | |
| this.next_status = 0; | |
| } | |
| // this.el.textContent = this.status+ "|"+this.next_status; | |
| return; | |
| }, | |
| goto_next_status: function () { | |
| if (this.status == this.next_status || this.next_status == -1) { | |
| this.next_status = -1; | |
| return; | |
| } | |
| this.status = this.next_status; | |
| this.next_status = -1; | |
| this.update_style(); | |
| return; | |
| }, | |
| update_style: function () { | |
| if (this.status == 1) { | |
| this.el.className = "cell live"; | |
| } else { | |
| this.el.className = "cell"; | |
| } | |
| return; | |
| }, | |
| get_neighbors: function () { | |
| var coords = [ | |
| [this.x - 1, this.y -1], | |
| [this.x - 1, this.y ], | |
| [this.x - 1, this.y +1], | |
| [this.x , this.y - 1], | |
| [this.x , this.y + 1], | |
| [this.x + 1, this.y - 1], | |
| [this.x + 1, this.y ], | |
| [this.x + 1, this.y + 1] | |
| ]; | |
| coords = coords.filter(function (co) { | |
| return 0 <= co[0] && co[0] < Game.config.width && 0 <= co[1] && co[1] < Game.config.height; | |
| }); | |
| return coords.map(function (co) { | |
| return Game.cells[co[0] * Game.config.width + co[1]]; | |
| }); | |
| }, | |
| toString: function() { | |
| return "[" + this.x + ", " + this.y + "]" + " : "+ this.status; | |
| } | |
| } | |
| var set_up = function () { | |
| log("set up game") | |
| var config = Game.config = { | |
| width: 20, | |
| height: 20, | |
| seed: [21,22,41,42, 24, 25, 26] | |
| }; | |
| var cell_width = 30; | |
| Game.cells = []; | |
| Game.grid = document.createElement("div"); | |
| Game.grid.className = "grid"; | |
| Game.grid.style.width = config.width * cell_width + "px"; | |
| Game.grid.style.height = config.height * cell_width + "px"; | |
| for (var i=0;i<config.width;i++) { | |
| for (var j=0;j<config.height;j++) { | |
| var status = ~~(config.seed.indexOf(j + i * config.width) != -1); | |
| var cell = new Cell(i, j, status, cell_width); | |
| Game.cells.push(cell); | |
| Game.grid.appendChild(cell.el); | |
| } | |
| } | |
| document.body.appendChild(Game.grid); | |
| }; | |
| var tick = Game.tick = function () { | |
| for (var i=0;i<Game.config.width;i++) { | |
| for (var j=0;j<Game.config.height;j++) { | |
| var cell = Game.cells[i * Game.config.width + j]; | |
| cell.set_next_status(); | |
| } | |
| } | |
| for (var i=0;i<Game.config.width;i++) { | |
| for (var j=0;j<Game.config.height;j++) { | |
| var cell = Game.cells[i * Game.config.width + j]; | |
| cell.goto_next_status(); | |
| } | |
| } | |
| }; | |
| Game.start = function () { | |
| log("start game") | |
| set_up(); | |
| setInterval(tick, 100); | |
| }; | |
| Game.start(); | |
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