js实现canvas四色花朵旋转加载动画效果代码-html代码-BFW代码库

js实现canvas四色花朵旋转加载动画效果代码

代码语言：html

代码描述：js实现canvas四色花朵旋转加载动画效果代码

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>

<head>
    <meta charset="UTF-8">
    <style>
        body {
      padding:0;
      margin:0;
      background: #111;
      overflow: hidden;
    }
    
    canvas {
      bottom: 0;
      left: 0;
      margin: auto;
      position: absolute;
      right: 0;
      top: 0;
    }
    </style>
</head>

<body>

    <script>
        var M = Math,
        PI = M.PI,
        TWOPI = PI * 2,
        HALFPI = PI / 2,
        canvas = document.createElement( 'canvas'),
        ctx = canvas.getContext( '2d' ),
        width = canvas.width = 350,
        height = canvas.height = 350,
        cx = width / 2,
        cy = height / 2,
        count = 40,
        sizeBase = 0.1,
        sizeDiv = 5,
        tick = 0;
    
    ctx.translate( cx, cy );
    
    (function loop() {
      requestAnimationFrame( loop );  
      ctx.clearRect( -width / 2, -height / 2, width, height );
      ctx.fillStyle = '#fff';  
      var angle = tick / 8,
          radius = -50 + M.sin( tick / 15 ) * 100,
      .........完整代码请登录后点击上方下载按钮下载查看