js实现乌云暴雨canvas动画效果-html代码-BFW代码库

js实现乌云暴雨canvas动画效果

代码语言：html

所属分类：粒子

下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">

<style>
/********************
  Common
********************/

html, body {
  height: 100%;
  width: 100%;
  font-family: Helvetica, verdana, monospace;
  color: #FFFFFF;
  font-size: 100%;
  background: #000000;
  padding: 0;
  margin: 0;
  letter-spacing: 0.2rem;
  overflow: hidden;
}

a {
  color: #FFF;
  text-decoration: none;
}

h1 {
  font-size: 1.6rem;
}

p {
  padding: 0.8rem 0;
  font-size: 0.8rem;
}

div#main {
  position: absolute;
  top: 0;
  left: 0;
  padding: 1.6rem;
}

p#loading {
  position: absolute;
  bottom: 0;
  right: 0;
  padding: 1.6rem;
}

/********************
  Contents
********************/

canvas#canvas {
  background: #000000;  /* fallback for old browsers */
  background: -webkit-linear-gradient(to bottom, #434343, #000000);  /* Chrome 10-25, Safari 5.1-6 */
  background: linear-gradient(to bottom, #434343, #000000); /* W3C, IE 10+/ Edge, Firefox 16+, Chrome 26+, Opera 12+, Safari 7+ */
}

div.controller {
  position: absolute;
  bottom: 0;
  left: 0;
  padding: 1.6rem
}
</style>
<script>
  window.console = window.console || function(t) {};
</script>
<script>
  if (document.location.search.match(/type=embed/gi)) {
    window.parent.postMessage("resize", "*");
  }
</script>
</head>
<body translate="no">

<div id="contents">
<canvas id="canvas">This browser cannot use a canvas.</canvas>
<div class="controller">
<label for="amount">Rainfall</label>
<input type="range" id="amount" min="0" max="1000">
</div>
</div>

<script >
(function () {
  'use strict';
  window.addEventListener('load', function () {
    var canvas = document.getElementById('canvas');
    var amout = document.getElementById('amout');
    var direction = document.getElementById('direction');

    if (!canvas || !canvas.getContext) {
      return false;
    }

    /********************
        Random Number
      ********************/

    function rand(min, max) {
      return Math.floor(Math.random() * (max - min + 1) + min);
    }

    /********************
        Var
      ********************/

    // canvas 
    var ctx = canvas.getContext('2d');
    var X = canvas.width = window.innerWidth;
    var Y = canvas.height = window.innerHeight;

    /********************
                                                  Animation
                                                ********************/

    window.requestAnimationFrame =
    window.requestAnimationFrame ||
    window.mozRequestAnimationFrame ||
    window.webkitRequestAnimationFrame ||
    window.msRequestAnimationFrame ||
    function (cb) {
      setTimeout(cb, 17);
    };

    /********************
         Cloud
       ********************/

    // var
    var cloudNum = 20;
    var cloudInt = 0;

    var firstClouds = [];
    var firstCloudSpeed = 0.1;

    var secondClouds = [];
    var secondCloudSpeed = 0.05;

    var thirdClouds = [];
    var thirdCloudSpeed = 0.025;

    function Cloud(ctx, x, y, r, c, s) {
      this.ctx = ctx;
      this.init(x, y, r, c, s);
    }

    Cloud.prototype.init = function (x, y, r, c, s) {
      this.ctx = ctx;
      this.x = x;
      this.y = y;
      this.r = r;
      this.c = c;
      this.s = s;
    };

    Cloud.prototype.draw = function () {
      ctx = this.ctx;
      ctx.beginPath();
      ctx.fillStyle = this.c;
      ctx.arc(this.x, this.y, this.r, Math.PI * 2, false);
      ctx.fill();
      ctx.closePath();
    };

    Cloud.prototype.updatePosition = function () {
      this.x -= this.s;
    };

    Cloud.prototype.wrapPosition = function () {
      if (this.x + this.r < 0) {
        this.x = X + this.r;
      }
    };

    Cloud.prototype.resize = function () {
      this.........完整代码请登录后点击上方下载按钮下载查看