Rust を学び始めたのでとりあえずライフゲームを書いてみた。Wasm 対応もしている。
terminal
2023-07-26.19.22.35.mov
wasm
2023-12-02.22.25.28.mov
$ wasm-pack build
$ npm init wasm-app www
$ cd www
$ npm i
package.json
"dependencies": {
"wasm-game-of-life": "file:../pkg"
},
$ npm i
www/index.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Hello wasm-pack!</title>
<style>
body {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
}
</style>
</head>
<body>
<noscript>This page contains webassembly and javascript content, please enable javascript in your browser.</noscript>
<pre id="game-of-life-pre"></pre>
<canvas id="game-of-life-canvas"></canvas>
<script src="./bootstrap.js"></script>
</body>
</html>
www/index.js
import { WasmLifeGame } from "wasm-game-of-life";
const pre = document.getElementById("game-of-life-pre");
const lifeGame = WasmLifeGame.new(30);
const renderLoop = () => {
pre.textContent = lifeGame.render();
lifeGame.tick();
setTimeout(renderLoop, 500);
};
requestAnimationFrame(renderLoop);
$ cd www
$ npm run start
index.js
import { WasmLifeGame } from "wasm-game-of-life";
const CELL_SIZE = 10; // px
const GRID_COLOR = "#CCCCCC";
const DEAD_COLOR = "#FFFFFF";
const ALIVE_COLOR = "#000000";
const lifeGame = WasmLifeGame.new(75);
const size = lifeGame.size();
const canvas = document.getElementById("game-of-life-canvas");
canvas.width = (CELL_SIZE + 1) * size + 1;
canvas.height = (CELL_SIZE + 1) * size + 1;
const ctx = canvas.getContext("2d");
const renderLoop = () => {
lifeGame.tick();
drawGrid();
drawCells();
setTimeout(renderLoop, 500);
};
requestAnimationFrame(renderLoop);
const drawGrid = () => {
ctx.beginPath();
ctx.strokeStyle = GRID_COLOR;
// Vertical lines.
for (let i = 0; i <= size; i++) {
ctx.moveTo(i * (CELL_SIZE + 1) + 1, 0);
ctx.lineTo(i * (CELL_SIZE + 1) + 1, (CELL_SIZE + 1) * size + 1);
}
// Horizontal lines.
for (let j = 0; j <= size; j++) {
ctx.moveTo(0, j * (CELL_SIZE + 1) + 1);
ctx.lineTo((CELL_SIZE + 1) * size + 1, j * (CELL_SIZE + 1) + 1);
}
ctx.stroke();
};
const getIndex = (row, column) => {
return row * size + column;
};
const drawCells = () => {
const cells = lifeGame.table();
ctx.beginPath();
for (let row = 0; row < size; row++) {
for (let col = 0; col < size; col++) {
const idx = getIndex(row, col);
ctx.fillStyle = cells[idx] ? ALIVE_COLOR : DEAD_COLOR;
ctx.fillRect(
col * (CELL_SIZE + 1) + 1,
row * (CELL_SIZE + 1) + 1,
CELL_SIZE,
CELL_SIZE
);
}
}
ctx.stroke();
};