feat: draw gol on canvas
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@ -22,30 +22,11 @@ const { title } = Astro.props;
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</html>
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<style is:global>
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:root {
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--accent: 136, 58, 234;
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--accent-light: 224, 204, 250;
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--accent-dark: 49, 10, 101;
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--accent-gradient: linear-gradient(
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45deg,
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rgb(var(--accent)),
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rgb(var(--accent-light)) 30%,
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white 60%
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);
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--h1-desktop: 3.815rem;
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font-size: 18px;
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}
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html {
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font-family: system-ui, sans-serif;
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background: #13151a;
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background-size: 224px;
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}
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code {
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font-family:
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Menlo,
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Monaco,
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Lucida Console,
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Liberation Mono,
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DejaVu Sans Mono,
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Bitstream Vera Sans Mono,
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Courier New,
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monospace;
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body {
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display: flex;
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justify-content: center;
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}
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</style>
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@ -1,12 +1,26 @@
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---
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import { Title } from '../components/header';
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import Layout from '../layouts/Layout.astro';
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import '../styles/gol.css';
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---
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<div id="title-and-gol">
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<Title />
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<Layout title="log101">
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<div class="container">
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<div class="header">
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<h1 class="main-title">log101</h1>
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<div id="board" class="board"></div>
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</div>
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</div>
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<button id="startButton">Start Game</button>
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<script src="../scripts/gol.js"></script>
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<button id="startButton">Start Game</button>
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<button id="changeWidthButton">Change Width</button>
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</div>
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</Layout>
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<script>
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import ConwaySimulator from '../scripts/conway-simulator';
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let gol = new ConwaySimulator(10, 46, 10, 250);
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document.getElementById('board')?.append(gol.canvas);
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gol.start();
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const startButton = document.getElementById('startButton');
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startButton!.onclick = () => gol.stop();
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</script>
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485
src/scripts/conway-simulator.js
Normal file
485
src/scripts/conway-simulator.js
Normal file
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@ -0,0 +1,485 @@
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import { heavyWeightSpaceshipCell } from './utils'
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/*
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A wrapper for an HTML <canvas> based visualizatiuon of Conway's Game of Life.
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*/
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export default class ConwaySimulator {
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/*
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Create a new simulation. A simulation is comprised of a
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2D data grid (rows-by-cols) of ConwayPixels, a canvas element,
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and a canvas context.
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*/
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constructor(rows, cols, pixelSize, interRoundDelay) {
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this.rows = rows;
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this.cols = cols;
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this.pixelSize = pixelSize;
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this.interRoundDelay = interRoundDelay;
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this.mouseIsDown = false;
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this.paused = false;
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this.intervalId = null;
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// Make the grid
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this.grid = [];
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for (let i = 0; i < rows; i++) {
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this.grid.push([]);
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for (let j = 0; j < cols; j++) {
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let alive = heavyWeightSpaceshipCell(j, i)
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this.grid[i].push(new ConwayPixel(alive));
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}
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}
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// Inform each pixel who it's neighbors are (performance optimization)
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for (let i = 0; i < this.rows; i++) {
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for (let j = 0; j < this.cols; j++) {
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this.grid[i][j].neighbors = this.getNeighbors(i, j);
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}
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}
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// Setup the canvas
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let width = this.pixelSize * this.cols
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let height = this.pixelSize * this.rows
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this.canvas = document.createElement('canvas');
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this.canvas.width = width;
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this.canvas.height = height;
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this.canvasCtx = this.canvas.getContext('2d', { alpha: true });
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}
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/*
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Starts the simulation via setInterval if it's not running
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*/
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start() {
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if (this.intervalId) {
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return;
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}
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this.intervalId = setInterval(() => {
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this.advanceRound();
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this.repaint();
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}, this.interRoundDelay);
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}
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/*
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If the simulation is running, stop it using clearInterval
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*/
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stop() {
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if (this.intervalId) {
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clearInterval(this.intervalId);
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this.intervalId = null;
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}
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}
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/*
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Return the neighbors of a particular grid location
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*/
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getNeighbors(row, col) {
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let neighbors = [];
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for (let i = row - 1; i <= row + 1; i++) {
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for (let j = col - 1; j <= col + 1; j++) {
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if (i === row && j === col) continue;
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if (this.grid[i] && this.grid[i][j]) {
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neighbors.push(this.grid[i][j]);
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}
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}
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}
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return neighbors;
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}
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/*
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Update the grid according to the rules for each SimEntity
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*/
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advanceRound() {
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if (this.mouseIsDown) return;
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// First prepare each pixel (give it a next state)
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for (let i = 0; i < this.rows; i++) {
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for (let j = 0; j < this.cols; j++) {
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this.grid[i][j].prepareUpdate();
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}
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}
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// Then actually advance them, once all the new states are computed
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for (let i = 0; i < this.rows; i++) {
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for (let j = 0; j < this.cols; j++) {
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this.grid[i][j].update();
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}
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}
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}
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/*
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Optimized repaint that only updates pixels that have changed, and paints
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in batches by color. Using force will repaint all pixels regardless of their
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state/previousState/nextState, which is slower.
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*/
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repaint(force = false) {
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if (this.mouseIsDown && !force) return;
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// Canvas optimization -- it's faster to paint by color than placement.
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let byColor = {};
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for (let i = 0; i < this.rows; i++) {
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for (let j = 0; j < this.cols; j++) {
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let pixel = this.grid[i][j];
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if (!force && !pixel.forceRepaint && pixel.alive === pixel.previousState) {
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continue; // No need to repaint if the pixel didn't change
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}
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let color = pixel.alive ? pixel.lifeStyle : pixel.deathStyle;
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if (byColor[color] === undefined) {
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byColor[color] = []
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}
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byColor[color].push([i, j]);
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pixel.forceRepaint = false; // Once a pixel is painted, reset it's forced state
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}
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}
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for (let color in byColor) {
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this.canvasCtx.fillStyle = color;
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for (let [row, col] of byColor[color]) {
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this.canvasCtx.fillRect(
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col * this.pixelSize,
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row * this.pixelSize,
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this.pixelSize,
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this.pixelSize
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);
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}
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}
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}
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/*
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Paint an individual pixel. This is not used by repaint because of a batch
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optimziation. painting an individual pixel does take place when click events
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happen.
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*/
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paintPixel(row, col) {
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this.grid[row][col].setPaintStyles(this.canvasCtx);
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this.canvasCtx.fillRect(
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col * this.pixelSize,
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row * this.pixelSize,
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this.pixelSize,
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this.pixelSize
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);
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}
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/* =============
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Visualizatiuon Modifiers
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================ */
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/*
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Give each entity in the grid an alive style such that when all pixels are alive
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the grid would be a rainbow gradient.
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*/
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setRainbowScheme() {
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let rows = this.grid.length;
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let cols = this.grid[0].length;
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let diagonalLength = Math.sqrt((this.rows * this.rows) + (this.cols * this.cols));
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let hueIncrement = 360 / diagonalLength;
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for (let i = 0; i < this.rows; i++) {
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for (let j = 0; j < this.cols; j++) {
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let h = Math.floor(Math.sqrt((i * i) + (j * j)) * hueIncrement);
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let px = this.grid[i][j];
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px.lifeStyle = `hsl(${h}, 100%, 60%)`;
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px.deathStyle = `#000000`;
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px.forceRepaint = true;
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}
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}
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}
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/*
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Give each entity in the specified area of the grid an alive style
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such that when all pixels are alive the area would be a rainbow gradient.
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*/
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setRainbowSchemeWithin(startRow, stopRow, startCol, stopCol) {
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let rows = stopRow - startRow;
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let cols = stopCol - startCol;
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let diagonalLength = Math.sqrt((rows * rows) + (cols * cols));
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let hueIncrement = 360 / diagonalLength;
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for (let i = startRow; i < stopRow; i++) {
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for (let j = startCol; j < stopCol; j++) {
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let h = Math.floor(Math.sqrt((i * i) + (j * j)) * hueIncrement);
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let px = this.grid[i][j];
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px.lifeStyle = `hsl(${h}, 100%, 60%)`;
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px.deathStyle = `#000000`;
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px.forceRepaint = true;
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}
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}
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}
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/*
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set colors to the provided parameters
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*/
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setPixelColors(lifeStyle, deathStyle) {
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this.grid.forEach((row) => {
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row.forEach((entity) => {
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entity.lifeStyle = lifeStyle;
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entity.deathStyle = deathStyle;
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entity.forceRepaint = true;
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});
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});
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}
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/*
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Give the board random semi-complementary colors.
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*/
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setRandomPixelColors() {
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let baseHue = randomInteger(1, 360);
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let complementaryHue = (baseHue + randomInteger(90, 270) % 360);
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this.setPixelColors(`hsl(${baseHue}, 100%, 60%)`, `hsl(${complementaryHue}, 100%, 60%)`)
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}
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/*
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Given a bounding box, apply the currently selected rules to ONLY the
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pixels within the provided box.
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*/
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applyColorsWithin(rowStart, rowStop, colStart, colStop, lifeStyle, deathStyle) {
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for (let i = rowStart; i < rowStop; i++) {
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for (let j = colStart; j < colStop; j++) {
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let pixel = this.grid[i][j];
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pixel.lifeStyle = lifeStyle;
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pixel.deathStyle = deathStyle;
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pixel.forceRepaint = true;
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}
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}
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}
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/*
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Give a sopecific area of the board random semi-complementary colors.
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*/
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applyRandomColorsWithin(rowStart, rowStop, colStart, colStop) {
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let baseHue = randomInteger(1, 360);
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let complementaryHue = (baseHue + randomInteger(90, 270) % 360);
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this.applyColorsWithin(rowStart, rowStop, colStart, `hsl(${baseHue}, 100%, 60%)`, `hsl(${complementaryHue}, 100%, 60%)`)
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}
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/*
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Set all the pixels to alive=false
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*/
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resetLife(chanceOfLife) {
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this.grid.forEach((row) => {
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row.forEach((pixel) => {
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pixel.previousState = pixel.alive;
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pixel.alive = Math.random() < chanceOfLife;
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});
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});
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this.repaint();
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}
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/*
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Given a bounding box, apply the currently selected rules to ONLY the
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pixels within the provided box.
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*/
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resetLifeWithin(rowStart, rowStop, colStart, colStop, chanceOfLife = .1) {
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for (let i = rowStart; i < rowStop; i++) {
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for (let j = colStart; j < colStop; j++) {
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let pixel = this.grid[i][j];
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if (pixel) {
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pixel.previousState = pixel.alive;
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pixel.alive = Math.random() < chanceOfLife;
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}
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}
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}
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this.repaint();
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}
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/*
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Update the rules for all the pixels
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*/
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setRules(underpopulation, overpopulation, reproductionMin, reproductionMax) {
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this.grid.forEach((row) => {
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row.forEach((pixel) => {
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pixel.underpopulation = underpopulation;
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pixel.overpopulation = overpopulation;
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pixel.reproductionMin = reproductionMin;
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pixel.reproductionMax = reproductionMax;
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});
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});
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}
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/*
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Swap life and death styles across the center of the grid.
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*/
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setYinYangMode() {
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for (let i = 0; i < this.rows; i++) {
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for (let j = 0; j < this.cols / 2; j++) {
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let t = this.grid[i][j].lifeStyle;
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this.grid[i][j].lifeStyle = this.grid[i][j].deathStyle;
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this.grid[i][j].deathStyle = t;
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}
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}
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this.repaint(true);
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}
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/*
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Given a bounding box, apply the currently selected rules to ONLY the
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pixels within the provided box.
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*/
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setRulesWithin(rowStart, rowStop, colStart, colStop, underpopulation, overpopulation, reproductionMin, reproductionMax) {
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for (let i = rowStart; i < rowStop; i++) {
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for (let j = colStart; j < colStop; j++) {
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let pixel = this.grid[i][j];
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pixel.underpopulation = underpopulation;
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pixel.overpopulation = overpopulation;
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pixel.reproductionMin = reproductionMin;
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pixel.reproductionMax = reproductionMax;
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pixel.forceRepaint = true;
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}
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}
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}
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/*
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The grid has click, and click-and-drag functionality. Entities define their
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own behavior when clicked, and this function ensures the proper entity is
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updated when it is clicked (or dragged-over)
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*/
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registerMouseListeners() {
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bindMultipleEventListener(this.canvas, ['mousemove', 'touchmove'], (e) => {
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e.preventDefault();
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if (this.mouseIsDown) {
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let x, y;
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if (e.touches) {
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let rect = e.target.getBoundingClientRect();
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x = Math.floor((e.touches[0].pageX - rect.left) / this.pixelSize);
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y = Math.floor((e.touches[0].pageY - rect.top) / this.pixelSize);
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}
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else {
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x = Math.floor(e.offsetX / this.pixelSize);
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y = Math.floor(e.offsetY / this.pixelSize);
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}
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this.grid[y][x].handleClick();
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this.paintPixel(y, x);
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}
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});
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// Capture mouse state for click and drag features
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bindMultipleEventListener(this.canvas, ['mousedown', 'touchstart'], (e) => {
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e.preventDefault();
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let rect = e.target.getBoundingClientRect();
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let x, y;
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if (e.touches) {
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let rect = e.target.getBoundingClientRect();
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x = Math.floor((e.touches[0].pageX - rect.left) / this.pixelSize);
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y = Math.floor((e.touches[0].pageY - rect.top) / this.pixelSize);
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}
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else {
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x = Math.floor(e.offsetX / this.pixelSize);
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y = Math.floor(e.offsetY / this.pixelSize);
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}
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this.grid[y][x].handleClick();
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this.paintPixel(y, x);
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this.mouseIsDown = true;
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});
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bindMultipleEventListener(this.canvas, ['mouseup', 'touchend'], (e) => {
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e.preventDefault();
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this.mouseIsDown = false;
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});
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}
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}
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/*
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A single pixel within a greater ConwaySimulator. Each ConwayPixel has it's own rules for evolution,
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and for performance reason's maintains a list of it's neighbors inside of it's simulator.
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This class is intended as an internal class, and is not exported. Manipulation of individual
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ConwayPixels outside of the ConwaySimulator class is not advised.
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*/
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class ConwayPixel {
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/*
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Constuct a default ConwayPixel, which follows the original Game of Life rules.
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*/
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constructor(alive) {
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this.alive = alive;
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this.lifeStyle = '#000000';
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this.deathStyle = '#FFFFFF';
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this.underpopulation = 2;
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this.overpopulation = 3;
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this.reproductionMin = 3;
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this.reproductionMax = 3;
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// Experimental improvement...
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this.neighbors = [];
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this.nextState = null;
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this.previousState = null;
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this.forceRepaint = true;
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// Reproduction min cannot be more than reproduction max
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if (this.reproductionMax < this.reproductionMin) {
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this.reproductionMin = this.reproductionMax
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}
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}
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/*
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In order to process whole rounds at a time, update returns
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a replacement entity, it does not edit the entity in place.
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Following the rules for conway's game of life:
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Any live cell with fewer than two live neighbors dies,
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as if caused by underpopulation.
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Any live cell with two or three live neighbors lives on
|
||||
to the next generation.
|
||||
|
||||
Any live cell with more than three live neighbors dies,
|
||||
as if by overpopulation.
|
||||
|
||||
Any dead cell with exactly three live neighbors becomes
|
||||
a live cell, as if by reproduction.
|
||||
|
||||
*/
|
||||
prepareUpdate() {
|
||||
let sum = 0;
|
||||
let nextState = this.alive;
|
||||
|
||||
for (let n of this.neighbors) {
|
||||
if (n.alive && n !== this) sum++;
|
||||
}
|
||||
|
||||
if (nextState && sum < this.underpopulation) {
|
||||
nextState = false;
|
||||
}
|
||||
else if (nextState && sum > this.overpopulation) {
|
||||
nextState = false;
|
||||
}
|
||||
else if (!nextState && sum >= this.reproductionMin && sum <= this.reproductionMax) {
|
||||
nextState = true;
|
||||
}
|
||||
|
||||
this.nextState = nextState;
|
||||
}
|
||||
|
||||
/*
|
||||
Advance this pixel to it's nextState.
|
||||
*/
|
||||
update() {
|
||||
this.previousState = this.alive;
|
||||
this.alive = this.nextState;
|
||||
this.nextState = null;
|
||||
}
|
||||
|
||||
/*
|
||||
The calling context infers that a click HAS occured, this is not a mouse;
|
||||
this is not an event listener.
|
||||
*/
|
||||
handleClick() {
|
||||
this.alive = true;
|
||||
}
|
||||
|
||||
/*
|
||||
Provided with a canvas context, paint ourselves!
|
||||
*/
|
||||
setPaintStyles(canvasCtx) {
|
||||
canvasCtx.fillStyle = this.alive ? this.lifeStyle : this.deathStyle;
|
||||
}
|
||||
}
|
||||
|
|
@ -1,7 +1,9 @@
|
|||
const boardElement = document.getElementById('board');
|
||||
const boardSize = 10;
|
||||
const grid = [];
|
||||
let intervalId;
|
||||
let boardWidth = 100; // Width of the board
|
||||
const boardHeight = 7; // Height of the board
|
||||
const currentGrid = []; // Current state of the grid
|
||||
const nextGrid = []; // Next state of the grid
|
||||
let intervalId; // ID for the setInterval
|
||||
|
||||
const cells = ['30', '20', '51', '01', '62', '63', '03', '64', '54', '44', '34', '24', '14']
|
||||
|
||||
|
|
@ -11,49 +13,44 @@ const heavyWeightSpaceshipCell = (x, y) => {
|
|||
}
|
||||
|
||||
function initializeBoard() {
|
||||
for (let y = 0; y < boardSize; y++) {
|
||||
let row = [];
|
||||
for (let x = 0; x < boardSize; x++) {
|
||||
for (let y = 0; y < boardHeight; y++) {
|
||||
currentGrid[y] = [];
|
||||
nextGrid[y] = [];
|
||||
for (let x = 0; x < boardWidth; x++) {
|
||||
let cell = document.createElement('div');
|
||||
cell.classList.add('cell');
|
||||
boardElement.appendChild(cell);
|
||||
if (heavyWeightSpaceshipCell(x, y)) {
|
||||
cell.classList.add('alive');
|
||||
boardElement.appendChild(cell);
|
||||
row.push(1)
|
||||
cell.classList.add('alive')
|
||||
currentGrid[y][x] = 1;
|
||||
nextGrid[y][x] = 0;
|
||||
} else {
|
||||
boardElement.appendChild(cell);
|
||||
row.push(0);
|
||||
currentGrid[y][x] = 0;
|
||||
nextGrid[y][x] = 0;
|
||||
}
|
||||
|
||||
}
|
||||
grid.push(row);
|
||||
}
|
||||
}
|
||||
|
||||
function computeNextGeneration() {
|
||||
let changes = [];
|
||||
|
||||
grid.forEach((row, y) => {
|
||||
row.forEach((cell, x) => {
|
||||
let aliveNeighbors = countAliveNeighbors(y, x);
|
||||
if (cell === 1 && (aliveNeighbors < 2 || aliveNeighbors > 3)) {
|
||||
changes.push({ y, x, state: 0 });
|
||||
} else if (cell === 0 && aliveNeighbors === 3) {
|
||||
changes.push({ y, x, state: 1 });
|
||||
for (let y = 0; y < boardHeight; y++) {
|
||||
for (let x = 0; x < boardWidth; x++) {
|
||||
const aliveNeighbors = countAliveNeighbors(y, x);
|
||||
const cell = currentGrid[y][x];
|
||||
nextGrid[y][x] = (cell === 1 && (aliveNeighbors === 2 || aliveNeighbors === 3)) || (cell === 0 && aliveNeighbors === 3) ? 1 : 0;
|
||||
}
|
||||
}
|
||||
});
|
||||
});
|
||||
|
||||
changes.forEach(change => {
|
||||
grid[change.y][change.x] = change.state;
|
||||
const cellElement = boardElement.children[change.y * boardSize + change.x];
|
||||
cellElement.animate([
|
||||
{ backgroundColor: change.state ? 'black' : 'white' }
|
||||
], {
|
||||
duration: 50,
|
||||
fill: 'forwards'
|
||||
});
|
||||
});
|
||||
// Apply changes and minimize DOM updates
|
||||
for (let y = 0; y < boardHeight; y++) {
|
||||
for (let x = 0; x < boardWidth; x++) {
|
||||
if (currentGrid[y][x] !== nextGrid[y][x]) {
|
||||
const cellElement = boardElement.children[y * boardWidth + x];
|
||||
cellElement.classList.toggle('alive', nextGrid[y][x] === 1);
|
||||
}
|
||||
currentGrid[y][x] = nextGrid[y][x];
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
function countAliveNeighbors(y, x) {
|
||||
|
|
@ -61,23 +58,43 @@ function countAliveNeighbors(y, x) {
|
|||
for (let yOffset = -1; yOffset <= 1; yOffset++) {
|
||||
for (let xOffset = -1; xOffset <= 1; xOffset++) {
|
||||
if (yOffset === 0 && xOffset === 0) continue;
|
||||
// Wrap around the edges
|
||||
let newY = (y + yOffset + boardSize) % boardSize;
|
||||
let newX = (x + xOffset + boardSize) % boardSize;
|
||||
count += grid[newY][newX];
|
||||
const newY = (y + yOffset + boardHeight) % boardHeight;
|
||||
const newX = (x + xOffset + boardWidth) % boardWidth;
|
||||
count += currentGrid[newY][newX];
|
||||
}
|
||||
}
|
||||
return count;
|
||||
}
|
||||
|
||||
function startGame() {
|
||||
console.log('starting')
|
||||
if (intervalId) clearInterval(intervalId);
|
||||
intervalId = setInterval(computeNextGeneration, 500);
|
||||
intervalId = setInterval(computeNextGeneration, 100);
|
||||
}
|
||||
|
||||
function changeWidth() {
|
||||
if (intervalId) clearInterval(intervalId); // stop the game
|
||||
|
||||
document.querySelectorAll(".cell").forEach(el => el.remove()); // remove the cells
|
||||
|
||||
var r = document.querySelector(':root')
|
||||
boardWidth += 50;
|
||||
boardWidth %= 200;
|
||||
|
||||
|
||||
r.style.setProperty('--board-width', boardWidth)
|
||||
initializeBoard()
|
||||
}
|
||||
|
||||
const startButton = document.getElementById('startButton')
|
||||
|
||||
startButton.onclick = startGame
|
||||
|
||||
const changeWidthButton = document.getElementById('changeWidthButton')
|
||||
|
||||
changeWidthButton.onclick = changeWidth
|
||||
|
||||
window.onresize = () => {
|
||||
console.log(document.getElementById('board').clientWidth)
|
||||
}
|
||||
|
||||
initializeBoard();
|
||||
|
|
|
|||
6
src/scripts/utils.js
Normal file
6
src/scripts/utils.js
Normal file
|
|
@ -0,0 +1,6 @@
|
|||
const cells = ['30', '20', '51', '01', '62', '63', '03', '64', '54', '44', '34', '24', '14']
|
||||
|
||||
export const heavyWeightSpaceshipCell = (x, y) => {
|
||||
const coor = `${x}${y}`
|
||||
return cells.includes(coor)
|
||||
}
|
||||
|
|
@ -1,20 +1,14 @@
|
|||
.board {
|
||||
display: grid;
|
||||
grid-template-columns: repeat(10, 5px);
|
||||
row-gap: 1px;
|
||||
column-gap: 1px;
|
||||
}
|
||||
.cell {
|
||||
width: 5px;
|
||||
height: 5px;
|
||||
background-color: white;
|
||||
}
|
||||
.alive {
|
||||
background-color: black;
|
||||
.container {
|
||||
width: 710;
|
||||
}
|
||||
|
||||
#title-and-gol {
|
||||
.main-title {
|
||||
font-family: 'Courier New', Courier, monospace;
|
||||
font-size: var(--h1-desktop);
|
||||
max-width: 250;
|
||||
}
|
||||
|
||||
.header {
|
||||
display: flex;
|
||||
flex-direction: row;
|
||||
align-items: center;
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user