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添加下雨特效 #20

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添加下雨特效 #20

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65 changes: 65 additions & 0 deletions 下雨.html
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Original file line number Diff line number Diff line change
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<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>下雨</title>
<style>
body {
background-color: black;
overflow: hidden;
}
</style>
</head>

<body>
<canvas></canvas>
<script>
const cvs = document.querySelector('canvas');
const ctx = cvs.getContext('2d');
let rains = [];
const count = 1000;
initCvs();
window.addEventListener('resize', () => initCvs());
addRain();
render();
function addRain() {
while (rains.length < count) {
const length = Math.random() * 30 + 10;
rains.push({
x: Math.random() * cvs.width,
y: -length - Math.random() * cvs.height,
length,
speed: Math.random() * 15 + 15
});
}
requestAnimationFrame(addRain);
}

function render() {
if (rains.length > 0) {
ctx.clearRect(0, 0, cvs.width, cvs.height);
rains.forEach((v, i) => {
if (v.y > cvs.height)
rains.splice(i, 1);
ctx.beginPath();
ctx.moveTo(v.x, v.y);
ctx.lineTo(v.x, v.y + v.length);
ctx.stroke();
ctx.closePath();
v.y += v.speed;
});
}
rainAnimation = requestAnimationFrame(render);
}

function initCvs() {
cvs.width = window.innerWidth;
cvs.height = window.innerHeight;
ctx.strokeStyle = '#fff';
}
</script>
</body>

</html>