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基于html5 can-vas实现漫天飞雪效果实例

2020-03-24 15:43:23
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本文实例讲述了基于html5 canvas实现漫天飞雪效果的方法,运行该实例可以看到很棒的下雪效果。如下图所示:

基于html5 canvas实现漫天飞雪效果实例

主要代码如下:

代码如下:<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "<a href="http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd</a>">

<html xmlns="<a href="http://www.w3.org/1999/xhtml">http://www.w3.org/1999/xhtml</a>">

<head>

<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />

<title>漫天飞雪</title>

<style type="text/css">

* {margin: 0; padding: 0;}</p> <p>body {

/*You can use any kind of background here.*/

background: #6b92b9;

}

canvas {

display: block;

}

</style>

</head></p> <p><body></p> <p><div style=" background:#6b92b9; width:100%; height:2000px;" ></div>

<canvas id="canvas" style="position:fixed; top:0px;left:0px;z-index:80;pointer-events:none;"></canvas></p> <p><script>

window.onload = function(){

//canvas init

var canvas = document.getElementById("canv
破晓电影网[www.aikan.tv/special/poxiaodianyingwang/]as");

var ctx = canvas.getContext("2d");



//canvas dimensions

var W = window.innerWidth;

var H = window.innerHeight;

canvas.width = W;

canvas.height = H;



//snowflake particles

var mp = 3000; //max particles

var particles = [];

for(var i = 0; i < mp; i++)

{

particles.push({

x: Math.random()*W, //x-coordinate

y: Math.random()*H, //y-coordinate

r: Math.random()*3+1, //radius

d: Math.random()*mp //density

})

}



//Lets draw the flakes

function draw()

{

ctx.clearRect(0, 0, W, H);



ctx.fillStyle = "rgba(255, 255, 255, 0.8)";

/* ctx.fillStyle = "#FF0000";*/

ctx.beginPath();

for(var i = 0; i < mp; i++)

{

var p = particles[i];

ctx.moveTo(p.x, p.y);

ctx.arc(p.x, p.y, p.r, 0, Math.PI*2, true);

}

ctx.fill();

update();

}



//Function to move the snowflakes

//angle will be an ongoing incremental flag. Sin and Cos functions will be applied to it to create vertical and horizontal movements of the flakes

var angle = 0;

function update()

{

angle += 0.01;

for(var i = 0; i < mp; i++)

{

var p = particles[i];

//Updating X and Y coordinates

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