140 lines
3.0 KiB
JavaScript
140 lines
3.0 KiB
JavaScript
import { Universe, Cell } from "wasm-game-of-life";
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import { memory } from "wasm-game-of-life/wasm_game_of_life_bg.wasm";
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const CELL_SIZE = 5;
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const GRID_COLOR = "#CCCCCC";
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const DEAD_COLOR = "#FFFFFF";
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const ALIVE_COLOR = "#000000";
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const universe = Universe.new();
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const width = universe.width();
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const height = universe.height();
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// Give the canvas room for all of our cells and a 1px border
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// around each of them.
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const canvas = document.getElementById("game-of-life-canvas");
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canvas.height = (CELL_SIZE + 1) * height + 1;
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canvas.width = (CELL_SIZE + 1) * width + 1;
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canvas.addEventListener("mousedown", event => {
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const boundingRect = canvas.getBoundingClientRect();
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const scaleX = canvas.width / boundingRect.width;
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const scaleY = canvas.height / boundingRect.height;
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const canvasLeft = (event.clientX - boundingRect.left) * scaleX;
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const canvasTop = (event.clientY - boundingRect.top) * scaleY;
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const row = Math.min(Math.floor(canvasTop / (CELL_SIZE + 1)), height - 1);
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const col = Math.min(Math.floor(canvasLeft / (CELL_SIZE + 1)), width - 1);
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if (event.ctrlKey) {
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universe.glider(row, col);
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} else if (event.shiftKey) {
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universe.pulsar(row, col);
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} else {
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universe.toggle_cell(row, col);
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}
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drawGrid();
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drawCells();
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});
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const ctx = canvas.getContext('2d');
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const playPauseButton = document.getElementById("play-pause");
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const reset = document.getElementById("reset");
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reset.addEventListener("click", event => {
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universe.kill_all();
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});
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const drawGrid = () => {
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ctx.beginPath();
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ctx.strokeStyle = GRID_COLOR;
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// Vertical lines.
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for (let i = 0; i <= width; i++) {
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ctx.moveTo(i * (CELL_SIZE + 1) + 1, 0);
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ctx.lineTo(i * (CELL_SIZE + 1) + 1, (CELL_SIZE + 1) * height + 1);
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}
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// Horizontal lines.
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for (let j = 0; j <= height; j++) {
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ctx.moveTo(0, j * (CELL_SIZE + 1) + 1);
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ctx.lineTo((CELL_SIZE + 1) * width + 1, j * (CELL_SIZE + 1) + 1);
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}
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ctx.stroke();
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};
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const getIndex = (row, column) => {
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return row * width + column;
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};
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const drawCells = () => {
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const cellsPtr = universe.cells();
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const cells = new Uint8Array(memory.buffer, cellsPtr, width * height);
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ctx.beginPath();
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for (let row = 0; row < height; row++) {
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for (let col = 0; col < width; col++) {
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const idx = getIndex(row, col);
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ctx.fillStyle = cells[idx] === Cell.Dead
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? DEAD_COLOR
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: ALIVE_COLOR;
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ctx.fillRect(
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col * (CELL_SIZE + 1) + 1,
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row * (CELL_SIZE + 1) + 1,
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CELL_SIZE,
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CELL_SIZE
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);
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}
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}
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ctx.stroke();
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};
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const isPaused = () => {
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return animationId === null;
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};
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const play = () => {
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playPauseButton.textContent = "⏸";
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renderLoop();
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};
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const pause = () => {
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playPauseButton.textContent = "▶";
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cancelAnimationFrame(animationId);
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animationId = null;
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};
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playPauseButton.addEventListener("click", event => {
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if (isPaused()) {
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play();
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} else {
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pause();
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}
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});
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let animationId = null;
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const renderLoop = () => {
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universe.tick();
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drawGrid();
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drawCells();
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animationId = requestAnimationFrame(renderLoop);
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};
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drawGrid();
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drawCells();
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// requestAnimationFrame(renderLoop);
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play();
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