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Javascript实现的飘雪效果

2015-02-27 11:05 197 查看

<html>

<head>
<canvas id="christmasCanvas" style="top: 0px; left: 0px; z-index: 5000; position: fixed; pointer-events: none;" ></canvas>

<script>
var snow = function() {
var b = document.getElementById("christmasCanvas"), a = b.getContext("2d"), d = window.innerWidth, c = window.innerHeight;
b.width = d;
b.height = c;
for(var e = [], b = 0;b < 70;b++) {
e.push({x:Math.random() * d, y:Math.random() * c, r:Math.random() * 4 + 1, d:Math.random() * 70})
}
var h = 0;
window.intervral4Christmas = setInterval(function() {
a.clearRect(0, 0, d, c);
a.fillStyle = "rgba(255, 255, 0, 0.6)";
a.shadowBlur = 5;
a.shadowColor = "rgba(255, 255, 255, 0.9)";
a.beginPath();
for(var b = 0;b < 70;b++) {
var f = e[b];
a.moveTo(f.x, f.y);
a.arc(f.x, f.y, f.r, 0, Math.PI * 2, !0)
}
a.fill();
h += 0.01;
for(b = 0;b < 70;b++) {
if(f = e[b], f.y += Math.cos(h + f.d) + 1 + f.r / 2, f.x += Math.sin(h) * 2, f.x > d + 5 || f.x < -5 || f.y > c) {
e[b] = b % 3 > 0 ? {x:Math.random() * d, y:-10, r:f.r, d:f.d} : Math.sin(h) > 0 ? {x:-5, y:Math.random() * c, r:f.r, d:f.d} : {x:d + 5, y:Math.random() * c, r:f.r, d:f.d}
}
}
}, 70)
}

snow();

</script>

</head>

<body></body>

</html>

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标签： function canvas html

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