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First working version

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This commit is contained in:
klangner 2020-09-12 15:49:33 +02:00
parent dbf765dff4
commit a0b32a783b
7 changed files with 394 additions and 223 deletions
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3
.gitignore vendored
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/demo/target
Cargo.lock
.vscode/
pkg/
pkg/
package-lock.json

2
demo/README.md
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```
wasm-pack build
cd www
npm run build
```
This app uses:

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/***/ (function(module, exports, __webpack_require__) {
eval("// A dependency graph that contains any wasm must all be imported\n// asynchronously. This `bootstrap.js` file does the single async import, so\n// that no one else needs to worry about it again.\n__webpack_require__.e(/*! import() */ 0).then(__webpack_require__.bind(null, /*! ./index.js */ \"./index.js\"))\n .catch(e => console.error(\"Error importing `index.js`:\", e));\n\n\n//# sourceURL=webpack:///./bootstrap.js?");
/***/ })
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<html>
<head>
<meta charset="utf-8">
<title>Mapgen demo</title>
<style>
body {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
}
#fps {
white-space: pre;
font-family: monospace;
}
</style>
<title>Hello wasm-pack!</title>
</head>
<body>
<h1>Map generator demo</h1>
<button id="play-pause"></button>
<div id="fps"></div>
<canvas id="demo-canvas"></canvas>
<script src='./index.js'></script>
<noscript>This page contains webassembly and javascript content, please enable javascript in your browser.</noscript>
<script src="./bootstrap.js"></script>
</body>
</html>

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import { Universe, Cell } from "wasm-game-of-life";
import { memory } from "wasm-game-of-life/wasm_game_of_life_bg";
const CELL_SIZE = 8; // px
const GRID_COLOR = "#CCCCCC";
const DEAD_COLOR = "#FFFFFF";
const ALIVE_COLOR = "#000000";
// Construct the universe, and get its width and height.
// const universe = Universe.new_spaceship();
const universe = Universe.new();
const width = universe.width();
const height = universe.height();
// Give the canvas room for all of our cells and a 1px border
// around each of them.
const canvas = document.getElementById("game-of-life-canvas");
canvas.height = (CELL_SIZE + 1) * height + 1;
canvas.width = (CELL_SIZE + 1) * width + 1;
const ctx = canvas.getContext('2d');
let animationId = null;
const renderLoop = () => {
fps.render();
for (let i = 0; i < 9; i++) {
universe.tick();
}
drawGrid();
drawCells();
animationId = requestAnimationFrame(renderLoop);
};
const drawGrid = () => {
ctx.beginPath();
ctx.strokeStyle = GRID_COLOR;
// Vertical lines.
for (let i = 0; i <= width; i++) {
ctx.moveTo(i * (CELL_SIZE + 1) + 1, 0);
ctx.lineTo(i * (CELL_SIZE + 1) + 1, (CELL_SIZE + 1) * height + 1);
}
// Horizontal lines.
for (let j = 0; j <= height; j++) {
ctx.moveTo(0, j * (CELL_SIZE + 1) + 1);
ctx.lineTo((CELL_SIZE + 1) * width + 1, j * (CELL_SIZE + 1) + 1);
}
ctx.stroke();
};
const getIndex = (row, column) => {
return row * width + column;
};
const drawCells = () => {
const cellsPtr = universe.cells();
// This is updated!
const cells = new Uint8Array(memory.buffer, cellsPtr, width * height / 8);
ctx.beginPath();
// Alive cells.
ctx.fillStyle = ALIVE_COLOR;
for (let row = 0; row < height; row++) {
for (let col = 0; col < width; col++) {
const idx = getIndex(row, col);
if (!bitIsSet(idx, cells)) {
continue;
}
ctx.fillRect(
col * (CELL_SIZE + 1) + 1,
row * (CELL_SIZE + 1) + 1,
CELL_SIZE,
CELL_SIZE
);
}
}
// Dead cells.
ctx.fillStyle = DEAD_COLOR;
for (let row = 0; row < height; row++) {
for (let col = 0; col < width; col++) {
const idx = getIndex(row, col);
if (bitIsSet(idx, cells)) {
continue;
}
ctx.fillRect(
col * (CELL_SIZE + 1) + 1,
row * (CELL_SIZE + 1) + 1,
CELL_SIZE,
CELL_SIZE
);
}
}
ctx.stroke();
};
const bitIsSet = (n, arr) => {
const byte = Math.floor(n / 8);
const mask = 1 << (n % 8);
return (arr[byte] & mask) === mask;
};
const isPaused = () => {
return animationId === null;
};
const playPauseButton = document.getElementById("play-pause");
const play = () => {
playPauseButton.textContent = "⏸";
renderLoop();
};
const pause = () => {
playPauseButton.textContent = "▶";
cancelAnimationFrame(animationId);
animationId = null;
};
playPauseButton.addEventListener("click", event => {
if (isPaused()) {
play();
} else {
pause();
}
});
canvas.addEventListener("click", event => {
const boundingRect = canvas.getBoundingClientRect();
const scaleX = canvas.width / boundingRect.width;
const scaleY = canvas.height / boundingRect.height;
const canvasLeft = (event.clientX - boundingRect.left) * scaleX;
const canvasTop = (event.clientY - boundingRect.top) * scaleY;
const row = Math.min(Math.floor(canvasTop / (CELL_SIZE + 1)), height - 1);
const col = Math.min(Math.floor(canvasLeft / (CELL_SIZE + 1)), width - 1);
universe.toggle_cell(row, col);
drawGrid();
drawCells();
});
const fps = new class {
constructor() {
this.fps = document.getElementById("fps");
this.frames = [];
this.lastFrameTimeStamp = performance.now();
}
render() {
// Convert the delta time since the last frame render into a measure
// of frames per second.
const now = performance.now();
const delta = now - this.lastFrameTimeStamp;
this.lastFrameTimeStamp = now;
const fps = 1 / delta * 1000;
// Save only the latest 100 timings.
this.frames.push(fps);
if (this.frames.length > 100) {
this.frames.shift();
}
// Find the max, min, and mean of our 100 latest timings.
let min = Infinity;
let max = -Infinity;
let sum = 0;
for (let i = 0; i < this.frames.length; i++) {
sum += this.frames[i];
min = Math.min(this.frames[i], min);
max = Math.max(this.frames[i], max);
}
let mean = sum / this.frames.length;
// Render the statistics.
this.fps.textContent = `
Frames per Second:
latest = ${Math.round(fps)}
avg of last 100 = ${Math.round(mean)}
min of last 100 = ${Math.round(min)}
max of last 100 = ${Math.round(max)}
`.trim();
}
};
play();