js实现canvas旋转旋涡动画效果代码-html代码-BFW代码库

js实现canvas旋转旋涡动画效果代码

代码语言：html

所属分类：动画

代码描述：js实现canvas旋转旋涡动画效果代码，滚动条往下拖动会更精彩。

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>
        * {
      margin: 0;
      padding: 0;
      color: #FFF;
    }
    
    canvas#canvas {
      display: block;
      background: #000;
    }
    
    ul#navigation {
      position: absolute;
      height: 100%;
      top: 0;
      right: 0;
      text-align: center;
      margin-right: 1.6rem;
      font-size: 0.8rem;
      -webkit-writing-mode: vertical-rl;
          -ms-writing-mode: tb-rl;
              writing-mode: vertical-rl;
    }
    
    ul#navigation > li {
      display: inline-block;
    }
    </style>

</head>

<body>

    <canvas id="canvas">Canvas not supported.</canvas>
    <ul id="navigation">
        <li>Scroll up and down.</li>
    </ul>

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

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

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

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

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

    var ctx = canvas.getContext('2d');
    var X = canvas.width = window.innerWidth;
    var Y = canvas.height = window.innerHeight;
    var mouseX = X / 2;
    var mouseY = Y / 2;
    var shapes = [];
    var shapeNum = 100;
    var angle = 360 / 3;
    var radian = angle * Math.PI / 180;
    var hsl = rand(0, 360);

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

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

    /********************
      Shape
    ********************/
    
    function Shape(ctx, x, y, i) {
      this.ctx = ctx;
      this.init(x, y, i);
    }

    Shape.prototype.init = function(x, y, i) {
      this.x = x;
      this.y = y;
      this.i = i;
      this.r = 15 * i;
      this.a = 1 * i;
      this.rad = this.a * Math.PI / 180;
    };

    Shape.prototype.draw = function() {
      var ctx  = this.ctx;
      ctx.save();
      ctx.strokeStyle = 'hsl(' + hsl + ', ' + (100 - this.i) + '%, ' + (100 - this.i) + '%';;
      ctx.lineWidth = 0.4;
      ctx.translate(this.x, this.y);
      ctx.rotate(Math.sin(this.rad * 3));
      ctx.translate(-this.x, -this.y);
      ctx.beginPath();
      ctx.moveTo(Math.sin(this.rad) * 100 + Math.sin(radian * 1) * this.r + this.x, Math.cos(this.rad) * 100 + Math.cos(radian * 1) * this.r + this.y);
      ctx.lineTo(Math.sin(this..........完整代码请登录后点击上方下载按钮下载查看