0022-wasm-康威生命游戏
环境
- Time 2022-05-18
- Rust 1.60.0
- Node 12.22.5
- wasm-pack 0.10.2
前言
说明
参考：https://rustwasm.github.io/docs/book/game-of-life/time-profiling.html
目标
在上一节的基础上进行。在游戏的界面上，增加 FPS 显示。
FPS
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();
}
};
渲染
const renderLoop = () => {
fps.render(); //new
universe.tick();
drawGrid();
drawCells();
animationId = requestAnimationFrame(renderLoop);
};
index.html
<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="utf-8">
<title>康威生命游戏</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>
</head>
<body>
<button id="play-pause"></button>
<div id="fps"></div>
<canvas id="game"></canvas>
<script src="./bootstrap.js"></script>
</body>
</html>
总结
实现了在游戏界面上，显示 FPS。
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