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Conway's Game of Life
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| <!doctype html> | |
| <html> | |
| <head lang="en"> | |
| <meta charset="UTF-8"> | |
| <title>Game of Life</title> | |
| </head> | |
| <canvas></canvas> | |
| <script src="main.js"></script> | |
| </html> |
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| "use strict"; | |
| var canvas = document.querySelector("canvas"); | |
| canvas.width = 1024; canvas.height = 512; | |
| var context = canvas.getContext("2d"); | |
| function clearScreen() { | |
| context.fillStyle = "white"; | |
| context.fillRect(0, 0, canvas.width, canvas.height); | |
| } | |
| var SCALE = 8; | |
| var WORLD_HEIGHT = canvas.height / SCALE, WORLD_WIDTH = canvas.width / SCALE; | |
| var world = [], buffer = []; | |
| function initializeWorld() { | |
| for (var y = 0; y < WORLD_HEIGHT; y++) { | |
| var worldRow = []; | |
| for (var x = 0; x < WORLD_WIDTH; x++) { | |
| worldRow.push(false); | |
| } | |
| world.push(worldRow); | |
| var bufferRow = []; | |
| for (x = 0; x < WORLD_WIDTH; x++) { | |
| bufferRow.push(false); | |
| } | |
| buffer.push(bufferRow); | |
| } | |
| } | |
| function saveWorld() { | |
| world.forEach(function (row, y) { | |
| row.forEach(function (elt, x) { | |
| buffer[y][x] = elt; | |
| }) | |
| }) | |
| } | |
| function clearWorld() { | |
| world.forEach(function (row, y) { | |
| row.forEach(function (elt, x) { | |
| world[y][x] = false; | |
| }) | |
| }) | |
| } | |
| function getRandomArbitrary(min, max) { // [min; max] | |
| return Math.round(Math.random() * (max - min) + min); | |
| } | |
| function generatePopulation() { | |
| world.forEach(function (row, y) { | |
| row.forEach(function (elt, x) { | |
| var randomNumber = getRandomArbitrary(0, 3); | |
| world[y][x] = randomNumber == 0; | |
| }) | |
| }) | |
| } | |
| function drawWorld() { | |
| context.fillStyle = "blue"; | |
| world.forEach(function (row, y) { | |
| row.forEach(function (elt, x) { | |
| if (elt == true) | |
| context.fillRect(x * SCALE, y * SCALE, SCALE, SCALE); | |
| }) | |
| }) | |
| } | |
| function countLiveNeighbours(y, x) { | |
| var count = 0; | |
| if (y - 1 >= 0 && x - 1 >= 0 && buffer[y - 1][x - 1]) count++; | |
| if (y - 1 >= 0 && buffer[y - 1][x]) count++; | |
| if (y - 1 >= 0 && x + 1 < WORLD_WIDTH && buffer[y - 1][x + 1]) count++; | |
| if (x + 1 < WORLD_WIDTH && buffer[y][x + 1]) count++; | |
| if (y + 1 < WORLD_HEIGHT && x + 1 < WORLD_WIDTH && buffer[y + 1][x + 1]) count++; | |
| if (y + 1 < WORLD_HEIGHT && buffer[y + 1][x]) count++; | |
| if (y + 1 < WORLD_HEIGHT && x - 1 >= 0 && buffer[y + 1][x - 1]) count++; | |
| if (x - 1 >= 0 && buffer[y][x - 1]) count++; | |
| return count; | |
| } | |
| function makeLife() { | |
| world.forEach(function (row, y) { | |
| row.forEach(function (elt, x) { | |
| var liveNeighbours = countLiveNeighbours(y, x); | |
| if ((liveNeighbours < 2 || liveNeighbours > 3) && buffer[y][x]) { | |
| world[y][x] = false; | |
| } else if ((liveNeighbours == 2 || liveNeighbours == 3) && buffer[y][x]) { | |
| world[y][x] = true; | |
| } else if (liveNeighbours == 3 && !buffer[y][x]) { | |
| world[y][x] = true; | |
| } | |
| }) | |
| }) | |
| } | |
| function makeStep() { | |
| saveWorld(); | |
| clearWorld(); | |
| makeLife(); | |
| clearScreen(); | |
| drawWorld(); | |
| setTimeout(makeStep, 100); | |
| } | |
| initializeWorld(); | |
| generatePopulation(); | |
| makeStep(); |
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