SVG动画vivus.js库使用小结(实例代码)

SVG动画vivus.js库使用整理，具体实例代码如下所示：

使用方法如图：

HTML例子代码：

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>vivus.js - test</title>
<style type="text/css">
  svg * {fill: none;stroke: currentColor;stroke-width:4;}
  .sunrise {color: #f037a5; background-color: #f8c72c;}
  .matrix  {color: #86e0c4; background-color: #181f21;}
  .electric {color: #78C9DB; background-color: #E4175B;}
  .night  {color: #D3D679; background-color: #316BD2;}
  i{ font-style:normal; color:#f00;}
  span{ color:#316BD2;}
</style>
</head>
<body>
  <div>
    <p>
    <span>var synthD</span> = new Vivus('<i>synth-dynamic</i>', {<br>
    　　<i>file: </i>'vivus-git/synth.svg',<br>
    　　<i>type: </i>'oneByOne',<br>
    　　duration: 200,<br>
    　　<i>start: </i>'manual',<br>
    　　<i>animTimingFunction:</i> Vivus.EASE_OUT_BOUNCE<br>
    });
    </p>
    <p>
    <span>synth-dynamic：</span>SVG的ID 或 加载外部SVG文件的父标签
    </p>
    <p>
    <span>file:</span><i>vivus-git/synth.svg</i>，如果是SVG的ID则可省略此设置，如果是加载外部SVG文件的父标签，对应的值则是SVG文件的路径
    </p>
    <p>
    <span>type:</span><br>
    　　对就值：<i>delayed</i> 每条路径元素绘制在同一时间用小延迟开始。这是目前默认动画。<br>
    　　对就值：<i>scenario-sync</i> 每一行都是同步的。他们都在同一时间开始和结束,因此得名“同步”。<br>
    　　对就值：<i>oneByOne</i> 每个路径元素是一个接一个。这个动画给人最好的印象的绘画。
    </p>
    <p>
    <span>start:</span>是否自动播放，可省略此设置，不设置则默认自动播放<br>
    　　对就值：<i>autostart</i> 默认值，自动播放<br>
    　　对就值：<i>manual</i> 不自动播放，需要事件触发播放
    </p>
    <p>
    <span>animTimingFunction:</span>动画效果<br>
    　　对就值：<i>LINEAR</i> 动画从头到尾的速度是相同的<br>
    　　对就值：<i>EASE</i> 动画以低速开始，然后加快，在结束前变慢。<br>
    　　对就值：<i>EASE_IN</i> 动画以低速开始。<br>
    　　对就值：<i>EASE_OUT</i> 动画以低速结束。<br>
    　　对就值：<i>EASE_OUT_BOUNCE</i> 动画弹性结束
    </p>
  </div>
  <div>
    <p>
      <span>synthD</span><i>.play();</i> 播放动画<br>
      <span>synthD</span><i>.reset().play();</i> 重新播放动画<br>
      <span>synthD</span><i>.play(-3);</i> 倒带，反向收回之前完成的动画
    </p>
  </div>
  <div class="matrix">
    <div>
     <p>每条路径元素绘制在同一时间用小延迟开始。这是目前默认动画。<br>vivus-git/obturateur.svg</p>
     <button onclick="obt1.reset().play();">重新播放动画</button>
     <button onclick="obt1.play(-3);">倒带</button>
    </div>
    <!--
    <div id="obt"></div>
    -->
    <div>
     <object id="obt" data="vivus-git/obturateur.svg" type="image/svg+xml" style="width: 100%; max-height: 250px;"></object>
    </div>
  </div>
  <div class="sunrise">
    <div>
     <p>每一行都是同步的。他们都在同一时间开始和结束,因此得名“同步”。<br>vivus-git/polaroid.svg</p>
     <button onclick="polaroidD.reset().play();">重新播放动画</button>
     <button onclick="polaroidD.play(-3);">倒带</button>
    </div>
    <div id="polaroid-dynamic"></div>
  </div>
  <div class="electric">
    <div>
     <p>每一行都是同步的。他们都在同一时间开始和结束,因此得名“同步”。<br>vivus-git/hi-there.svg</p>
     <button onclick="hiD.play();">播放动画</button>
     <button onclick="hiD.play(-3);">倒带</button>
    </div>
    <!--<div id="hi-dynamic" style="max-width: 300px; margin: auto;"></div>-->
    <svg height="300" xmlns="http://www.w3.org/2000/svg" x="0px" y="0px" viewBox="0 0 404.7 354" enable-background="new 0 0 404.7 354" id="hi-dynamic" onclick="hiD.reset().play();">
      <!-- HI -->
      <path data-duration="10" d="M324.6,61.2c16.6,0,29.5-12.9,29.5-29.5c0-16.6-12.9-29.5-29.5-29.5c-16.6,0-29.5,12.9-29.5,29.5C295.1,48.4,308,61.2,324.6,61.2z" style="stroke-dasharray: 186px, 226px; stroke-dashoffset: 0px;"></path>
      <path data-duration="130" d="M366.2,204.2c-9.8,0-15-5.6-15-15.1V77.2h-85v28h19.5c9.8,0,8.5,2.1,8.5,11.6v72.4c0,9.5,0.5,15.1-9.3,15.1H277h-20.7c-8.5,0-14.2-4.1-14.2-12.9V52.4c0-8.5,5.7-12.3,14.2-12.3h18.8v-28h-127v28h18.1c8.5,0,9.9,2.1,9.9,8.9v56.1h-75V53.4c0-11.5,8.6-13.3,17-13.3h11v-28H2.2v28h26c8.5,0,12,2.1,12,7.9v142.2c0,8.5-3.6,13.9-12,13.9h-21v33h122v-33h-11c-8.5,0-17-4.1-17-12.2v-57.8h75v58.4c0,9.1-1.4,11.6-9.9,11.6h-18.1v33h122.9h5.9h102.2v-33H366.2z" style="stroke-dasharray: 2216px, 2256px; stroke-dashoffset: 0px;"></path>
      <path data-async="" data-delay="20" d="M358.8,82.8c11.1-4.2,18.8-14.7,18.8-27.5c0-8.5-3.4-16-8.9-21.3" style="stroke-dasharray: 60px, 100px; stroke-dashoffset: 0px;"></path>
      <path data-async="" d="M124.2,105.7V77c0-11.5,9.1-13.8,17.5-13.8h10.5V44.7" style="stroke-dasharray: 84px, 124px; stroke-dashoffset: 0px;"></path>
      <path data-async="" d="M147.9,40.2L171.2,63.2L175.7,63.2" style="stroke-dasharray: 38px, 78px; stroke-dashoffset: 0px;"></path>
      <path data-async="" d="M295.1,32.1L275.2,12.2" style="stroke-dasharray: 29px, 69px; stroke-dashoffset: 0px;"></path>
      <path data-async="" d="M266.2,204.7V75.9c0-8.5,5.2-12.8,13.7-12.8h18.3V44.7" style="stroke-dasharray: 187px, 227px; stroke-dashoffset: 0px;"></path>
      <path data-async="" d="M265.9,105.2L289.2,129.2L293.7,129.2" style="stroke-dasharray: 38px, 78px; stroke-dashoffset: 0px;"></path>
      <path data-async="" d="M374.2,204.7L374.2,94.2L358.8,82.8L351.2,77.2" style="stroke-dasharray: 140px, 180px; stroke-dashoffset: 0px;"></path>
      <path data-async="" d="M148.2,237.2L171.2,261.2L294.6,261.2L300.5,261.2L402.2,261.2L402.2,228.2L379.2,204.2" style="stroke-dasharray: 331px, 371px; stroke-dashoffset: 0px;"></path>
      <path data-async="" d="M124.2,204.7L124.2,157.2L175.7,157.2" style="stroke-dasharray: 99px, 139px; stroke-dashoffset: 0px;"></path>
      <path data-async="" d="M147.7,228.2L129.2,204.2" style="stroke-dasharray: 31px, 71px; stroke-dashoffset: 0px;"></path>
      <path data-async="" d="M7.2,237.3L30.2,261.2L152.2,261.2L152.2,241.7" style="stroke-dasharray: 175px, 215px; stroke-dashoffset: 0px;"></path>
      <path data-async="" d="M1.9,40.2L26,63.2L39.7,63.2" style="stroke-dasharray: 48px, 88px; stroke-dashoffset: 0px;"></path>
      <path data-async="" d="M129.2,12.2L148.2,33.2" style="stroke-dasharray: 29px, 69px; stroke-dashoffset: 0px;"></path>
      <path data-async="" d="M303.9,53L328.1,77.2" style="stroke-dasharray: 35px, 75px; stroke-dashoffset: 0px;"></path>
      <path d="M345.1,10.5L368.7,34" style="stroke-dasharray: 34px, 74px; stroke-dashoffset: 0px;"></path>
      <!-- there -->
      <path data-delay="30" data-duration="60" stroke-linecap="round" stroke-linejoin="round" d="M76.8,337.3c0,0,1.9,12.2,13.1,12.2c22.1,0,23.8-1.8,59-66.4c-19.7,35.7-36.4,66.2-19.3,66.2c15.2,0,22.9-14.2,28.3-23.7c3.3-0.5,24-3.2,35-25.5c4-8.1,4.1-17.8-8.1-15.2c-5.6,1.2-13.1,14.8-15.7,19.2c-7.6,12.7-22.4,45.2-22.4,45.2s10.3-22.4,21.5-22.4c15.5,0-9.4,22.4,4.7,22.4c4.9,0,11.7-11.4,16.6-20.9c7.5,4.7,19.7,1.7,24.5-8.1c10.1-20.4-14.4-12.8-24.5,8.1c-5.5,11.3-2.2,21.1,11.2,21.1c16.4,0,26.1-28.3,30.5-37.5c9.9,2.5,14,2.5,22.7-1.1c-3.5,5.1-24,38.1-8.3,38.1c6.7,0,11.7-11.4,16.6-20.9c7.5,4.7,19.7,1.7,24.5-8.1c10.1-20.4-14.4-12.8-24.5,8.1c-5.5,11.3-2.2,21.1,11.2,21.1c16.4,0,20.6-4,24.7-10.5" style="stroke-dasharray: 851px, 891px; stroke-dashoffset: 0px;"></path>
      <path stroke-linecap="round" stroke-linejoin="round" d="M157.3,300.8c3.8-2.3-29,0.8-35.6,3.2" style="stroke-dasharray: 37px, 77px; stroke-dashoffset: 0px;"></path>
    </svg>
  </div>
  <div class="night">
    <div>
     <p>每个路径元素是一个接一个。这个动画给人最好的印象的绘画。<br>vivus-git/synth.svg</p>
     <button onclick="synthD.play();">播放动画</button>
     <button onclick="synthD.play(-3);">倒带</button>
    </div>
    <div id="synth-dynamic" style="max-width: 400px; margin: auto;"></div>
  </div>
  <!--<script src="vivus.js"></script>-->
  <script src="http://cdn.jsdelivr.net/vivus/latest/vivus.min.js"></script>
  <script>
   if (window.location.protocol === 'file:') {
     alert('请使用HTTP服务器服务(http://localhost/)访问此页面。');
   }
   var obt1 = new Vivus('obt', {
    /*
    加载SVG外部文件的方法：
    1、有object标签则 不用 加载SVG外部文件的代码：file: 'vivus-git/obturateur.svg'
    以上HTML中有此代码：<object id="obt" data="vivus-git/obturateur.svg" type="image/svg+xml" style="width: 100%; max-height: 250px;"></object>
    2、没有object标签则 要 加载SVG外部文件的代码：file: 'vivus-git/obturateur.svg'
    以上HTML中有此代码 已注释：<div id="obt"></div>
    */
    //file: 'vivus-git/obturateur.svg',
    type: 'delayed',//每条路径元素绘制在同一时间用小延迟开始。这是目前默认动画。
    duration: 150,
    //start: 'autostart'
   });
   var polaroidD = new Vivus('polaroid-dynamic', {
    file: 'vivus-git/polaroid.svg',
    //file: 'vivus-git/111.svg',
    type: 'scenario-sync',//每一行都是同步的。他们都在同一时间开始和结束,因此得名“同步”。
    duration: 20,
    start: 'autostart'
   });
   var hiD = new Vivus('hi-dynamic', {
    /*
    1、SVG内部标签， 不用 加载SVG外部文件的代码：file: 'vivus-git/hi-there.svg'
    以上HTML中有此代码：<svg height="300" xmlns="http://www.w3.org/2000/svg" x="0px" y="0px" viewBox="0 0 404.7 354" enable-background="new 0 0 404.7 354" id="hi-dynamic" onclick="hiD.reset().play();">
    2、加载SVG外部文件的方法：file: 'vivus-git/hi-there.svg'
    以上HTML中有此代码 已注释：<div id="hi-dynamic" style="max-width: 300px; margin: auto;"></div>
    */
    //file: 'vivus-git/hi-there.svg',
    type: 'scenario-sync',
    duration: 20,
    start: 'manual'
   });
   var synthD = new Vivus('synth-dynamic', {
    file: 'vivus-git/synth.svg',
    type: 'oneByOne',//每个路径元素是一个接一个。这个动画给人最好的印象的绘画。
    duration: 200,
    start: 'manual',
    animTimingFunction: Vivus.EASE_OUT
   });
//   function easeOutBounce (x) {
//    var base = -Math.cos(x * (0.5 * Math.PI)) + 1;
//    var rate = Math.pow(base,1.5);
//    var rateR = Math.pow(1 - x, 2);
//    var progress = -Math.abs(Math.cos(rate * (2.5 * Math.PI) )) + 1;
//    return (1- rateR) + (progress * rateR);
//   }
  </script>
 </body>
</html>
hi-there.svg代码：
[html] view plain copy
<svg height="300" xmlns="http://www.w3.org/2000/svg" x="0px" y="0px" viewBox="0 0 404.7 354" enable-background="new 0 0 404.7 354">
 <g stroke="#f9f9f9" stroke-width="3" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="10">
  <!-- HI -->
  <path data-duration="10" d="M324.6,61.2c16.6,0,29.5-12.9,29.5-29.5c0-16.6-12.9-29.5-29.5-29.5c-16.6,0-29.5,12.9-29.5,29.5C295.1,48.4,308,61.2,324.6,61.2z"/>
  <path data-duration="130" d="M366.2,204.2c-9.8,0-15-5.6-15-15.1V77.2h-85v28h19.5c9.8,0,8.5,2.1,8.5,11.6v72.4c0,9.5,0.5,15.1-9.3,15.1H277h-20.7c-8.5,0-14.2-4.1-14.2-12.9V52.4c0-8.5,5.7-12.3,14.2-12.3h18.8v-28h-127v28h18.1c8.5,0,9.9,2.1,9.9,8.9v56.1h-75V53.4c0-11.5,8.6-13.3,17-13.3h11v-28H2.2v28h26c8.5,0,12,2.1,12,7.9v142.2c0,8.5-3.6,13.9-12,13.9h-21v33h122v-33h-11c-8.5,0-17-4.1-17-12.2v-57.8h75v58.4c0,9.1-1.4,11.6-9.9,11.6h-18.1v33h122.9h5.9h102.2v-33H366.2z"/>
  <path data-async="" data-delay="20" d="M358.8,82.8c11.1-4.2,18.8-14.7,18.8-27.5c0-8.5-3.4-16-8.9-21.3"/>
  <path data-async="" d="M124.2,105.7V77c0-11.5,9.1-13.8,17.5-13.8h10.5V44.7"/>
  <polyline data-async="" points="147.9,40.2 171.2,63.2 175.7,63.2"/>
  <line data-async="" x1="295.1" y1="32.1" x2="275.2" y2="12.2"/>
  <path data-async="" d="M266.2,204.7V75.9c0-8.5,5.2-12.8,13.7-12.8h18.3V44.7"/>
  <polyline data-async="" points="265.9,105.2 289.2,129.2 293.7,129.2"/>
  <polyline data-async="" points="374.2,204.7 374.2,94.2 358.8,82.8 351.2,77.2"/>
  <polyline data-async="" points="148.2,237.2 171.2,261.2 294.6,261.2 300.5,261.2 402.2,261.2 402.2,228.2 379.2,204.2"/>
  <polyline data-async="" points="124.2,204.7 124.2,157.2 175.7,157.2"/>
  <line data-async="" x1="147.7" y1="228.2" x2="129.2" y2="204.2"/>
  <polyline data-async="" points="7.2,237.3 30.2,261.2 152.2,261.2 152.2,241.7"/>
  <polyline data-async="" points="1.9,40.2 26,63.2 39.7,63.2"/>
  <line data-async="" x1="129.2" y1="12.2" x2="148.2" y2="33.2"/>
  <line data-async="" x1="303.9" y1="53" x2="328.1" y2="77.2"/>
  <line x1="345.1" y1="10.5" x2="368.7" y2="34"/>
  <!-- there -->
  <path data-delay="30" data-duration="60" stroke-linecap="round" stroke-linejoin="round" d="M76.8,337.3c0,0,1.9,12.2,13.1,12.2c22.1,0,23.8-1.8,59-66.4c-19.7,35.7-36.4,66.2-19.3,66.2c15.2,0,22.9-14.2,28.3-23.7c3.3-0.5,24-3.2,35-25.5c4-8.1,4.1-17.8-8.1-15.2c-5.6,1.2-13.1,14.8-15.7,19.2c-7.6,12.7-22.4,45.2-22.4,45.2s10.3-22.4,21.5-22.4c15.5,0-9.4,22.4,4.7,22.4c4.9,0,11.7-11.4,16.6-20.9c7.5,4.7,19.7,1.7,24.5-8.1c10.1-20.4-14.4-12.8-24.5,8.1c-5.5,11.3-2.2,21.1,11.2,21.1c16.4,0,26.1-28.3,30.5-37.5c9.9,2.5,14,2.5,22.7-1.1c-3.5,5.1-24,38.1-8.3,38.1c6.7,0,11.7-11.4,16.6-20.9c7.5,4.7,19.7,1.7,24.5-8.1c10.1-20.4-14.4-12.8-24.5,8.1c-5.5,11.3-2.2,21.1,11.2,21.1c16.4,0,20.6-4,24.7-10.5"/>
  <path stroke-linecap="round" stroke-linejoin="round" d="M157.3,300.8c3.8-2.3-29,0.8-35.6,3.2"/>
 </g>
</svg>
obturateur.svg代码：
[html] view plain copy
<svg xmlns="http://www.w3.org/2000/svg" x="0px" y="0px" width="100%" height="200px" style="height:200px;" viewBox="0 0 200 200" enable-background="new 0 0 200 200">
 <g stroke="#f60" fill="none" stroke-width="3" stroke-linecap="round" stroke-linejoin="round" >
  <circle cx="100" cy="100" r="90"/>
  <circle cx="100" cy="100" r="85.74"/>
  <circle cx="100" cy="100" r="72.947"/>
  <circle cx="100" cy="100" r="39.74"/>
  <line x1="34.042" y1="131.189" x2="67.047" y2="77.781"/>
  <line x1="31.306" y1="75.416" x2="92.41" y2="60.987"/>
  <line x1="68.81" y1="34.042" x2="122.219" y2="67.046"/>
  <line x1="124.584" y1="31.305" x2="139.013" y2="92.409"/>
  <line x1="165.957" y1="68.809" x2="132.953" y2="122.219"/>
  <line x1="168.693" y1="124.584" x2="107.59" y2="139.012"/>
  <line x1="131.19" y1="165.957" x2="77.781" y2="132.953"/>
  <line x1="75.417" y1="168.693" x2="60.987" y2="107.59"/>
 </g>
</svg>
polaroid.svg代码：
[html] view plain copy
<svg id="polaroid" xmlns="http://www.w3.org/2000/svg" x="0px" y="0px" style="height:200px;" viewBox="0 0 200 160" enable-background="new 0 0 200 160">
 <g stroke="#f9f9f9" stroke-width="3" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="10">
  <!-- Case -->
  <!-- The case items will be drawn at the same time (attribute `data-async` on each tag) with a custom duration of 40 frames (attribute `data-duration`). WARNING: When you want to draw a bloc asynchronously (like here), the last item need to be `data-async` free. Otherwise the following tags will also start at the same time. I know it's a bit confusing, play a bit with it and you'll see. -->
  <path data-async="" data-duration="40" d="
   M106.725,104.742c-0.773,2.498-3.586,4.229-6.285,3.867L12.473,96.802c-2.699-0.363-4.262-2.682-3.49-5.18l25.164-81.436
   c0.771-2.496,3.584-4.229,6.283-3.866l87.966,11.808c2.699,0.362,4.264,2.68,3.49,5.179L106.725,104.742z"/>
  <path data-async="" data-duration="40" d="
   M101.02,123.207c-0.773,2.5-3.587,4.23-6.286,3.867L6.766,115.27c-2.699-0.363-4.26-2.682-3.488-5.182l2.91-9.417
   c0.771-2.499,3.585-4.23,6.285-3.87l87.967,11.809c2.699,0.361,4.261,2.682,3.49,5.18L101.02,123.207z"/>
  <line data-async="" data-duration="40" x1="103.377" y1="128.225" x2="154.768" y2="155.32"/>
  <line data-async="" data-duration="40" x1="109.852" y1="112.684" x2="155.035" y2="136.906"/>
  <path data-async="" data-duration="40" d="
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  <!-- Lens -->
  <!-- All item will be drawn line by line, with an exception for the first one, a little delay (attribute `data-delay) to make a break between the drawing of the case and the start of the lens part -->
  <path data-delay="20" d="
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  <path d="
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  <!-- Flash -->
  <!-- This tag does not have any extra attribute. So it will start when the previous tag is finished. His duration and delay will be the one given in the options. -->
  <path d="
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  <!-- Output -->
  <!-- Same case as Flash -->
  <path d="
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  <!-- Design (color lines on the front) -->
  <!-- All the lines will start at the same time, because they all have the attribute `data-async` -->
  <line data-async="" x1="47.583" y1="101.505" x2="51.561" y2="88.267"/>
  <line data-async="" x1="53.391" y1="102.326" x2="57.047" y2="90.125"/>
  <line data-async="" x1="59.224" y1="103.068" x2="62.749" y2="91.295"/>
  <line data-async="" x1="65.057" y1="103.814" x2="69.015" y2="90.637"/>
  <line data-async="" x1="72.87" y1="19.969" x2="75.497" y2="11.082"/>
  <line data-async="" x1="78.512" y1="21.325" x2="81.317" y2="11.868"/>
  <line data-async="" x1="83.833" y1="23.718" x2="87.16" y2="12.582"/>
  <line data-async="" x1="89.145" y1="26.141" x2="92.939" y2="13.498"/>
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</svg>
synth.svg代码：
[html] view plain copy
<?xml version="1.0" encoding="utf-8"?>
<!-- Generator: Adobe Illustrator 16.0.0, SVG Export Plug-In . SVG Version: 6.00 Build 0) -->
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
<svg version="1.1" id="Calque_1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="378.995px" height="259.5px" viewBox="0 0 378.995 259.5" enable-background="new 0 0 378.995 259.5" xml:space="preserve">
<g id="Synth">
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  <path fill="none" stroke="#241F20" stroke-width="4" stroke-linecap="round" stroke-linejoin="round" stroke-miterlimit="10" d="
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（vivus.min.js）CDN引用地址：http://cdn.jsdelivr.net/vivus/latest/vivus.min.js
vivus.js代码：
[html] view plain copy
/**
 * vivus - JavaScript library to make drawing animation on SVG
 * @version v0.4.0
 * @link https://github.com/maxwellito/vivus
 * @license MIT
 */
'use strict';
(function (window, document) {
 'use strict';
/**
 * Pathformer
 * Beta version
 *
 * Take any SVG version 1.1 and transform
 * child elements to 'path' elements
 *
 * This code is purely forked from
 * https://github.com/Waest/SVGPathConverter
 */
/**
 * Class constructor
 *
 * @param {DOM|String} element Dom element of the SVG or id of it
 */
function Pathformer(element) {
 // Test params
 if (typeof element === 'undefined') {
  throw new Error('Pathformer [constructor]: "element" parameter is required');
 }
 // Set the element
 if (element.constructor === String) {
  element = document.getElementById(element);
  if (!element) {
   throw new Error('Pathformer [constructor]: "element" parameter is not related to an existing ID');
  }
 }
 if (element.constructor instanceof window.SVGElement || /^svg$/i.test(element.nodeName)) {
  this.el = element;
 } else {
  throw new Error('Pathformer [constructor]: "element" parameter must be a string or a SVGelement');
 }
 // Start
 this.scan(element);
}
/**
 * List of tags which can be transformed
 * to path elements
 *
 * @type {Array}
 */
Pathformer.prototype.TYPES = ['line', 'ellipse', 'circle', 'polygon', 'polyline', 'rect'];
/**
 * List of attribute names which contain
 * data. This array list them to check if
 * they contain bad values, like percentage.
 *
 * @type {Array}
 */
Pathformer.prototype.ATTR_WATCH = ['cx', 'cy', 'points', 'r', 'rx', 'ry', 'x', 'x1', 'x2', 'y', 'y1', 'y2'];
/**
 * Finds the elements compatible for transform
 * and apply the liked method
 *
 * @param {object} options Object from the constructor
 */
Pathformer.prototype.scan = function (svg) {
 var fn, element, pathData, pathDom,
   elements = svg.querySelectorAll(this.TYPES.join(','));
 for (var i = 0; i < elements.length; i++) {
  element = elements[i];
  fn = this[element.tagName.toLowerCase() + 'ToPath'];
  pathData = fn(this.parseAttr(element.attributes));
  pathDom = this.pathMaker(element, pathData);
  element.parentNode.replaceChild(pathDom, element);
 }
};
/**
 * Read `line` element to extract and transform
 * data, to make it ready for a `path` object.
 *
 * @param {DOMelement} element Line element to transform
 * @return {object}       Data for a `path` element
 */
Pathformer.prototype.lineToPath = function (element) {
 var newElement = {},
   x1 = element.x1 || 0,
   y1 = element.y1 || 0,
   x2 = element.x2 || 0,
   y2 = element.y2 || 0;
 newElement.d = 'M' + x1 + ',' + y1 + 'L' + x2 + ',' + y2;
 return newElement;
};
/**
 * Read `rect` element to extract and transform
 * data, to make it ready for a `path` object.
 * The radius-border is not taken in charge yet.
 * (your help is more than welcomed)
 *
 * @param {DOMelement} element Rect element to transform
 * @return {object}       Data for a `path` element
 */
Pathformer.prototype.rectToPath = function (element) {
 var newElement = {},
   x   = parseFloat(element.x)   || 0,
   y   = parseFloat(element.y)   || 0,
   width = parseFloat(element.width) || 0,
   height = parseFloat(element.height) || 0;
 newElement.d = 'M' + x + ' ' + y + ' ';
 newElement.d += 'L' + (x + width) + ' ' + y + ' ';
 newElement.d += 'L' + (x + width) + ' ' + (y + height) + ' ';
 newElement.d += 'L' + x + ' ' + (y + height) + ' Z';
 return newElement;
};
/**
 * Read `polyline` element to extract and transform
 * data, to make it ready for a `path` object.
 *
 * @param {DOMelement} element Polyline element to transform
 * @return {object}       Data for a `path` element
 */
Pathformer.prototype.polylineToPath = function (element) {
 var newElement = {},
   points = element.points.trim().split(' '),
   i, path;
 // Reformatting if points are defined without commas
 if (element.points.indexOf(',') === -1) {
  var formattedPoints = [];
  for (i = 0; i < points.length; i+=2) {
   formattedPoints.push(points[i] + ',' + points[i+1]);
  }
  points = formattedPoints;
 }
 // Generate the path.d value
 path = 'M' + points[0];
 for(i = 1; i < points.length; i++) {
  if (points[i].indexOf(',') !== -1) {
   path += 'L' + points[i];
  }
 }
 newElement.d = path;
 return newElement;
};
/**
 * Read `polygon` element to extract and transform
 * data, to make it ready for a `path` object.
 * This method rely on polylineToPath, because the
 * logic is similar. The path created is just closed,
 * so it needs an 'Z' at the end.
 *
 * @param {DOMelement} element Polygon element to transform
 * @return {object}       Data for a `path` element
 */
Pathformer.prototype.polygonToPath = function (element) {
 var newElement = Pathformer.prototype.polylineToPath(element);
 newElement.d += 'Z';
 return newElement;
};
/**
 * Read `ellipse` element to extract and transform
 * data, to make it ready for a `path` object.
 *
 * @param {DOMelement} element ellipse element to transform
 * @return {object}       Data for a `path` element
 */
Pathformer.prototype.ellipseToPath = function (element) {
 var newElement = {},
   rx = parseFloat(element.rx) || 0,
   ry = parseFloat(element.ry) || 0,
   cx = parseFloat(element.cx) || 0,
   cy = parseFloat(element.cy) || 0,
   startX = cx - rx,
   startY = cy,
   endX = parseFloat(cx) + parseFloat(rx),
   endY = cy;
 newElement.d = 'M' + startX + ',' + startY +
         'A' + rx + ',' + ry + ' 0,1,1 ' + endX + ',' + endY +
         'A' + rx + ',' + ry + ' 0,1,1 ' + startX + ',' + endY;
 return newElement;
};
/**
 * Read `circle` element to extract and transform
 * data, to make it ready for a `path` object.
 *
 * @param {DOMelement} element Circle element to transform
 * @return {object}       Data for a `path` element
 */
Pathformer.prototype.circleToPath = function (element) {
 var newElement = {},
   r = parseFloat(element.r) || 0,
   cx = parseFloat(element.cx) || 0,
   cy = parseFloat(element.cy) || 0,
   startX = cx - r,
   startY = cy,
   endX = parseFloat(cx) + parseFloat(r),
   endY = cy;
 newElement.d = 'M' + startX + ',' + startY +
         'A' + r + ',' + r + ' 0,1,1 ' + endX + ',' + endY +
         'A' + r + ',' + r + ' 0,1,1 ' + startX + ',' + endY;
 return newElement;
};
/**
 * Create `path` elements form original element
 * and prepared objects
 *
 * @param {DOMelement} element Original element to transform
 * @param {object} pathData   Path data (from `toPath` methods)
 * @return {DOMelement}     Path element
 */
Pathformer.prototype.pathMaker = function (element, pathData) {
 var i, attr, pathTag = document.createElementNS('http://www.w3.org/2000/svg','path');
 for(i = 0; i < element.attributes.length; i++) {
  attr = element.attributes[i];
  if (this.ATTR_WATCH.indexOf(attr.name) === -1) {
   pathTag.setAttribute(attr.name, attr.value);
  }
 }
 for(i in pathData) {
  pathTag.setAttribute(i, pathData[i]);
 }
 return pathTag;
};
/**
 * Parse attributes of a DOM element to
 * get an object of attribute => value
 *
 * @param {NamedNodeMap} attributes Attributes object from DOM element to parse
 * @return {object}         Object of attributes
 */
Pathformer.prototype.parseAttr = function (element) {
 var attr, output = {};
 for (var i = 0; i < element.length; i++) {
  attr = element[i];
  // Check if no data attribute contains '%', or the transformation is impossible
  if (this.ATTR_WATCH.indexOf(attr.name) !== -1 && attr.value.indexOf('%') !== -1) {
   throw new Error('Pathformer [parseAttr]: a SVG shape got values in percentage. This cannot be transformed into \'path\' tags. Please use \'viewBox\'.');
  }
  output[attr.name] = attr.value;
 }
 return output;
};
 'use strict';
var requestAnimFrame, cancelAnimFrame, parsePositiveInt;
/**
 * Vivus
 * Beta version
 *
 * Take any SVG and make the animation
 * to give give the impression of live drawing
 *
 * This in more than just inspired from codrops
 * At that point, it's a pure fork.
 */
/**
 * Class constructor
 * option structure
 *  type: 'delayed'|'sync'|'oneByOne'|'script' (to know if the items must be drawn synchronously or not, default: delayed)
 *  duration: <int> (in frames)
 *  start: 'inViewport'|'manual'|'autostart' (start automatically the animation, default: inViewport)
 *  delay: <int> (delay between the drawing of first and last path)
 *  dashGap <integer> whitespace extra margin between dashes
 *  pathTimingFunction <function> timing animation function for each path element of the SVG
 *  animTimingFunction <function> timing animation function for the complete SVG
 *  forceRender <boolean> force the browser to re-render all updated path items
 *  selfDestroy <boolean> removes all extra styling on the SVG, and leaves it as original
 *
 * The attribute 'type' is by default on 'delayed'.
 * - 'delayed'
 *  all paths are draw at the same time but with a
 *  little delay between them before start
 * - 'sync'
 *  all path are start and finish at the same time
 * - 'oneByOne'
 *  only one path is draw at the time
 *  the end of the first one will trigger the draw
 *  of the next one
 *
 * All these values can be overwritten individually
 * for each path item in the SVG
 * The value of frames will always take the advantage of
 * the duration value.
 * If you fail somewhere, an error will be thrown.
 * Good luck.
 *
 * @constructor
 * @this {Vivus}
 * @param {DOM|String}  element Dom element of the SVG or id of it
 * @param {Object}    options Options about the animation
 * @param {Function}   callback Callback for the end of the animation
 */
function Vivus (element, options, callback) {
 // Setup
 this.isReady = false;
 this.setElement(element, options);
 this.setOptions(options);
 this.setCallback(callback);
 if (this.isReady) {
  this.init();
 }
}
/**
 * Timing functions
 **************************************
 *
 * Default functions to help developers.
 * It always take a number as parameter (between 0 to 1) then
 * return a number (between 0 and 1)
 */
Vivus.LINEAR     = function (x) {return x;};
Vivus.EASE      = function (x) {return -Math.cos(x * Math.PI) / 2 + 0.5;};
Vivus.EASE_OUT    = function (x) {return 1 - Math.pow(1-x, 3);};
Vivus.EASE_IN     = function (x) {return Math.pow(x, 3);};
Vivus.EASE_OUT_BOUNCE = function (x) {
 var base = -Math.cos(x * (0.5 * Math.PI)) + 1,
  rate = Math.pow(base,1.5),
  rateR = Math.pow(1 - x, 2),
  progress = -Math.abs(Math.cos(rate * (2.5 * Math.PI) )) + 1;
 return (1- rateR) + (progress * rateR);
};
/**
 * Setters
 **************************************
 */
/**
 * Check and set the element in the instance
 * The method will not return anything, but will throw an
 * error if the parameter is invalid
 *
 * @param {DOM|String}  element SVG Dom element or id of it
 */
Vivus.prototype.setElement = function (element, options) {
 // Basic check
 if (typeof element === 'undefined') {
  throw new Error('Vivus [constructor]: "element" parameter is required');
 }
 // Set the element
 if (element.constructor === String) {
  element = document.getElementById(element);
  if (!element) {
   throw new Error('Vivus [constructor]: "element" parameter is not related to an existing ID');
  }
 }
 this.parentEl = element;
 // Create the object element if the property `file` exists in the options object
 if (options && options.file) {
  var objElm = document.createElement('object');
  objElm.setAttribute('type', 'image/svg+xml');
  objElm.setAttribute('data', options.file);
  objElm.setAttribute('built-by-vivus', 'true');
  element.appendChild(objElm);
  element = objElm;
 }
 switch (element.constructor) {
 case window.SVGSVGElement:
 case window.SVGElement:
  this.el = element;
  this.isReady = true;
  break;
 case window.HTMLObjectElement:
  // If we have to wait for it
  var onLoad, self;
  self = this;
  onLoad = function (e) {
   if (self.isReady) {
    return;
   }
   self.el = element.contentDocument && element.contentDocument.querySelector('svg');
   if (!self.el && e) {
    throw new Error('Vivus [constructor]: object loaded does not contain any SVG');
   }
   else if (self.el) {
    if (element.getAttribute('built-by-vivus')) {
     self.parentEl.insertBefore(self.el, element);
     self.parentEl.removeChild(element);
     self.el.setAttribute('width', '100%');
     self.el.setAttribute('height', '100%');
    }
    self.isReady = true;
    self.init();
    return true;
   }
  };
  if (!onLoad()) {
   element.addEventListener('load', onLoad);
  }
  break;
 default:
  throw new Error('Vivus [constructor]: "element" parameter is not valid (or miss the "file" attribute)');
 }
};
/**
 * Set up user option to the instance
 * The method will not return anything, but will throw an
 * error if the parameter is invalid
 *
 * @param {object} options Object from the constructor
 */
Vivus.prototype.setOptions = function (options) {
 var allowedTypes = ['delayed', 'sync', 'async', 'nsync', 'oneByOne', 'scenario', 'scenario-sync'];
 var allowedStarts = ['inViewport', 'manual', 'autostart'];
 // Basic check
 if (options !== undefined && options.constructor !== Object) {
  throw new Error('Vivus [constructor]: "options" parameter must be an object');
 }
 else {
  options = options || {};
 }
 // Set the animation type
 if (options.type && allowedTypes.indexOf(options.type) === -1) {
  throw new Error('Vivus [constructor]: ' + options.type + ' is not an existing animation `type`');
 }
 else {
  this.type = options.type || allowedTypes[0];
 }
 // Set the start type
 if (options.start && allowedStarts.indexOf(options.start) === -1) {
  throw new Error('Vivus [constructor]: ' + options.start + ' is not an existing `start` option');
 }
 else {
  this.start = options.start || allowedStarts[0];
 }
 this.isIE     = (window.navigator.userAgent.indexOf('MSIE') !== -1 || window.navigator.userAgent.indexOf('Trident/') !== -1 || window.navigator.userAgent.indexOf('Edge/') !== -1 );
 this.duration   = parsePositiveInt(options.duration, 120);
 this.delay    = parsePositiveInt(options.delay, null);
 this.dashGap   = parsePositiveInt(options.dashGap, 1);
 this.forceRender = options.hasOwnProperty('forceRender') ? !!options.forceRender : this.isIE;
 this.reverseStack = !!options.reverseStack;
 this.selfDestroy = !!options.selfDestroy;
 this.onReady   = options.onReady;
 this.map     = [];
 this.frameLength = this.currentFrame = this.delayUnit = this.speed = this.handle = null;
 this.ignoreInvisible = options.hasOwnProperty('ignoreInvisible') ? !!options.ignoreInvisible : false;
 this.animTimingFunction = options.animTimingFunction || Vivus.LINEAR;
 this.pathTimingFunction = options.pathTimingFunction || Vivus.LINEAR;
 if (this.delay >= this.duration) {
  throw new Error('Vivus [constructor]: delay must be shorter than duration');
 }
};
/**
 * Set up callback to the instance
 * The method will not return enything, but will throw an
 * error if the parameter is invalid
 *
 * @param {Function} callback Callback for the animation end
 */
Vivus.prototype.setCallback = function (callback) {
 // Basic check
 if (!!callback && callback.constructor !== Function) {
  throw new Error('Vivus [constructor]: "callback" parameter must be a function');
 }
 this.callback = callback || function () {};
};
/**
 * Core
 **************************************
 */
/**
 * Map the svg, path by path.
 * The method return nothing, it just fill the
 * `map` array. Each item in this array represent
 * a path element from the SVG, with informations for
 * the animation.
 *
 * ```
 * [
 *  {
 *   el: <DOMobj> the path element
 *   length: <number> length of the path line
 *   startAt: <number> time start of the path animation (in frames)
 *   duration: <number> path animation duration (in frames)
 *  },
 *  ...
 * ]
 * ```
 *
 */
Vivus.prototype.mapping = function () {
 var i, paths, path, pAttrs, pathObj, totalLength, lengthMeter, timePoint;
 timePoint = totalLength = lengthMeter = 0;
 paths = this.el.querySelectorAll('path');
 for (i = 0; i < paths.length; i++) {
  path = paths[i];
  if (this.isInvisible(path)) {
   continue;
  }
  pathObj = {
   el: path,
   length: Math.ceil(path.getTotalLength())
  };
  // Test if the path length is correct
  if (isNaN(pathObj.length)) {
   if (window.console && console.warn) {
    console.warn('Vivus [mapping]: cannot retrieve a path element length', path);
   }
   continue;
  }
  this.map.push(pathObj);
  path.style.strokeDasharray = pathObj.length + ' ' + (pathObj.length + this.dashGap * 2);
  path.style.strokeDashoffset = pathObj.length + this.dashGap;
  pathObj.length += this.dashGap;
  totalLength += pathObj.length;
  this.renderPath(i);
 }
 totalLength = totalLength === 0 ? 1 : totalLength;
 this.delay = this.delay === null ? this.duration / 3 : this.delay;
 this.delayUnit = this.delay / (paths.length > 1 ? paths.length - 1 : 1);
 // Reverse stack if asked
 if (this.reverseStack) {
  this.map.reverse();
 }
 for (i = 0; i < this.map.length; i++) {
  pathObj = this.map[i];
  switch (this.type) {
  case 'delayed':
   pathObj.startAt = this.delayUnit * i;
   pathObj.duration = this.duration - this.delay;
   break;
  case 'oneByOne':
   pathObj.startAt = lengthMeter / totalLength * this.duration;
   pathObj.duration = pathObj.length / totalLength * this.duration;
   break;
  case 'sync':
  case 'async':
  case 'nsync':
   pathObj.startAt = 0;
   pathObj.duration = this.duration;
   break;
  case 'scenario-sync':
   path = pathObj.el;
   pAttrs = this.parseAttr(path);
   pathObj.startAt = timePoint + (parsePositiveInt(pAttrs['data-delay'], this.delayUnit) || 0);
   pathObj.duration = parsePositiveInt(pAttrs['data-duration'], this.duration);
   timePoint = pAttrs['data-async'] !== undefined ? pathObj.startAt : pathObj.startAt + pathObj.duration;
   this.frameLength = Math.max(this.frameLength, (pathObj.startAt + pathObj.duration));
   break;
  case 'scenario':
   path = pathObj.el;
   pAttrs = this.parseAttr(path);
   pathObj.startAt = parsePositiveInt(pAttrs['data-start'], this.delayUnit) || 0;
   pathObj.duration = parsePositiveInt(pAttrs['data-duration'], this.duration);
   this.frameLength = Math.max(this.frameLength, (pathObj.startAt + pathObj.duration));
   break;
  }
  lengthMeter += pathObj.length;
  this.frameLength = this.frameLength || this.duration;
 }
};
/**
 * Interval method to draw the SVG from current
 * position of the animation. It update the value of
 * `currentFrame` and re-trace the SVG.
 *
 * It use this.handle to store the requestAnimationFrame
 * and clear it one the animation is stopped. So this
 * attribute can be used to know if the animation is
 * playing.
 *
 * Once the animation at the end, this method will
 * trigger the Vivus callback.
 *
 */
Vivus.prototype.drawer = function () {
 var self = this;
 this.currentFrame += this.speed;
 if (this.currentFrame <= 0) {
  this.stop();
  this.reset();
 } else if (this.currentFrame >= this.frameLength) {
  this.stop();
  this.currentFrame = this.frameLength;
  this.trace();
  if (this.selfDestroy) {
   this.destroy();
  }
 } else {
  this.trace();
  this.handle = requestAnimFrame(function () {
   self.drawer();
  });
  return;
 }
 this.callback(this);
 if (this.instanceCallback) {
  this.instanceCallback(this);
  this.instanceCallback = null;
 }
};
/**
 * Draw the SVG at the current instant from the
 * `currentFrame` value. Here is where most of the magic is.
 * The trick is to use the `strokeDashoffset` style property.
 *
 * For optimisation reasons, a new property called `progress`
 * is added in each item of `map`. This one contain the current
 * progress of the path element. Only if the new value is different
 * the new value will be applied to the DOM element. This
 * method save a lot of resources to re-render the SVG. And could
 * be improved if the animation couldn't be played forward.
 *
 */
Vivus.prototype.trace = function () {
 var i, progress, path, currentFrame;
 currentFrame = this.animTimingFunction(this.currentFrame / this.frameLength) * this.frameLength;
 for (i = 0; i < this.map.length; i++) {
  path = this.map[i];
  progress = (currentFrame - path.startAt) / path.duration;
  progress = this.pathTimingFunction(Math.max(0, Math.min(1, progress)));
  if (path.progress !== progress) {
   path.progress = progress;
   path.el.style.strokeDashoffset = Math.floor(path.length * (1 - progress));
   this.renderPath(i);
  }
 }
};
/**
 * Method forcing the browser to re-render a path element
 * from it's index in the map. Depending on the `forceRender`
 * value.
 * The trick is to replace the path element by it's clone.
 * This practice is not recommended because it's asking more
 * ressources, too much DOM manupulation..
 * but it's the only way to let the magic happen on IE.
 * By default, this fallback is only applied on IE.
 *
 * @param {Number} index Path index
 */
Vivus.prototype.renderPath = function (index) {
 if (this.forceRender && this.map && this.map[index]) {
  var pathObj = this.map[index],
    newPath = pathObj.el.cloneNode(true);
  pathObj.el.parentNode.replaceChild(newPath, pathObj.el);
  pathObj.el = newPath;
 }
};
/**
 * When the SVG object is loaded and ready,
 * this method will continue the initialisation.
 *
 * This this mainly due to the case of passing an
 * object tag in the constructor. It will wait
 * the end of the loading to initialise.
 *
 */
Vivus.prototype.init = function () {
 // Set object variables
 this.frameLength = 0;
 this.currentFrame = 0;
 this.map = [];
 // Start
 new Pathformer(this.el);
 this.mapping();
 this.starter();
 if (this.onReady) {
  this.onReady(this);
 }
};
/**
 * Trigger to start of the animation.
 * Depending on the `start` value, a different script
 * will be applied.
 *
 * If the `start` value is not valid, an error will be thrown.
 * Even if technically, this is impossible.
 *
 */
Vivus.prototype.starter = function () {
 switch (this.start) {
 case 'manual':
  return;
 case 'autostart':
  this.play();
  break;
 case 'inViewport':
  var self = this,
  listener = function () {
   if (self.isInViewport(self.parentEl, 1)) {
    self.play();
    window.removeEventListener('scroll', listener);
   }
  };
  window.addEventListener('scroll', listener);
  listener();
  break;
 }
};
/**
 * Controls
 **************************************
 */
/**
 * Get the current status of the animation between
 * three different states: 'start', 'progress', 'end'.
 * @return {string} Instance status
 */
Vivus.prototype.getStatus = function () {
 return this.currentFrame === 0 ? 'start' : this.currentFrame === this.frameLength ? 'end' : 'progress';
};
/**
 * Reset the instance to the initial state : undraw
 * Be careful, it just reset the animation, if you're
 * playing the animation, this won't stop it. But just
 * make it start from start.
 *
 */
Vivus.prototype.reset = function () {
 return this.setFrameProgress(0);
};
/**
 * Set the instance to the final state : drawn
 * Be careful, it just set the animation, if you're
 * playing the animation on rewind, this won't stop it.
 * But just make it start from the end.
 *
 */
Vivus.prototype.finish = function () {
 return this.setFrameProgress(1);
};
/**
 * Set the level of progress of the drawing.
 *
 * @param {number} progress Level of progress to set
 */
Vivus.prototype.setFrameProgress = function (progress) {
 progress = Math.min(1, Math.max(0, progress));
 this.currentFrame = Math.round(this.frameLength * progress);
 this.trace();
 return this;
};
/**
 * Play the animation at the desired speed.
 * Speed must be a valid number (no zero).
 * By default, the speed value is 1.
 * But a negative value is accepted to go forward.
 *
 * And works with float too.
 * But don't forget we are in JavaScript, se be nice
 * with him and give him a 1/2^x value.
 *
 * @param {number} speed Animation speed [optional]
 */
Vivus.prototype.play = function (speed, callback) {
 this.instanceCallback = null;
 if (speed && typeof speed === 'function') {
  this.instanceCallback = speed; // first parameter is actually the callback function
  speed = null;
 }
 else if (speed && typeof speed !== 'number') {
  throw new Error('Vivus [play]: invalid speed');
 }
 // if the first parameter wasn't the callback, check if the seconds was
 if (callback && typeof(callback) === 'function' && !this.instanceCallback) {
  this.instanceCallback = callback;
 }
 this.speed = speed || 1;
 if (!this.handle) {
  this.drawer();
 }
 return this;
};
/**
 * Stop the current animation, if on progress.
 * Should not trigger any error.
 *
 */
Vivus.prototype.stop = function () {
 if (this.handle) {
  cancelAnimFrame(this.handle);
  this.handle = null;
 }
 return this;
};
/**
 * Destroy the instance.
 * Remove all bad styling attributes on all
 * path tags
 *
 */
Vivus.prototype.destroy = function () {
 this.stop();
 var i, path;
 for (i = 0; i < this.map.length; i++) {
  path = this.map[i];
  path.el.style.strokeDashoffset = null;
  path.el.style.strokeDasharray = null;
  this.renderPath(i);
 }
};
/**
 * Utils methods
 * include methods from Codrops
 **************************************
 */
/**
 * Method to best guess if a path should added into
 * the animation or not.
 *
 * 1. Use the `data-vivus-ignore` attribute if set
 * 2. Check if the instance must ignore invisible paths
 * 3. Check if the path is visible
 *
 * For now the visibility checking is unstable.
 * It will be used for a beta phase.
 *
 * Other improvments are planned. Like detecting
 * is the path got a stroke or a valid opacity.
 */
Vivus.prototype.isInvisible = function (el) {
 var rect,
  ignoreAttr = el.getAttribute('data-ignore');
 if (ignoreAttr !== null) {
  return ignoreAttr !== 'false';
 }
 if (this.ignoreInvisible) {
  rect = el.getBoundingClientRect();
  return !rect.width && !rect.height;
 }
 else {
  return false;
 }
};
/**
 * Parse attributes of a DOM element to
 * get an object of {attributeName => attributeValue}
 *
 * @param {object} element DOM element to parse
 * @return {object}     Object of attributes
 */
Vivus.prototype.parseAttr = function (element) {
 var attr, output = {};
 if (element && element.attributes) {
  for (var i = 0; i < element.attributes.length; i++) {
   attr = element.attributes[i];
   output[attr.name] = attr.value;
  }
 }
 return output;
};
/**
 * Reply if an element is in the page viewport
 *
 * @param {object} el Element to observe
 * @param {number} h Percentage of height
 * @return {boolean}
 */
Vivus.prototype.isInViewport = function (el, h) {
 var scrolled  = this.scrollY(),
  viewed    = scrolled + this.getViewportH(),
  elBCR    = el.getBoundingClientRect(),
  elHeight   = elBCR.height,
  elTop    = scrolled + elBCR.top,
  elBottom   = elTop + elHeight;
 // if 0, the element is considered in the viewport as soon as it enters.
 // if 1, the element is considered in the viewport only when it's fully inside
 // value in percentage (1 >= h >= 0)
 h = h || 0;
 return (elTop + elHeight * h) <= viewed && (elBottom) >= scrolled;
};
/**
 * Alias for document element
 *
 * @type {DOMelement}
 */
Vivus.prototype.docElem = window.document.documentElement;
/**
 * Get the viewport height in pixels
 *
 * @return {integer} Viewport height
 */
Vivus.prototype.getViewportH = function () {
 var client = this.docElem.clientHeight,
  inner = window.innerHeight;
 if (client < inner) {
  return inner;
 }
 else {
  return client;
 }
};
/**
 * Get the page Y offset
 *
 * @return {integer} Page Y offset
 */
Vivus.prototype.scrollY = function () {
 return window.pageYOffset || this.docElem.scrollTop;
};
/**
 * Alias for `requestAnimationFrame` or
 * `setTimeout` function for deprecated browsers.
 *
 */
requestAnimFrame = (function () {
 return (
  window.requestAnimationFrame    ||
  window.webkitRequestAnimationFrame ||
  window.mozRequestAnimationFrame  ||
  window.oRequestAnimationFrame   ||
  window.msRequestAnimationFrame   ||
  function(/* function */ callback){
   return window.setTimeout(callback, 1000 / 60);
  }
 );
})();
/**
 * Alias for `cancelAnimationFrame` or
 * `cancelTimeout` function for deprecated browsers.
 *
 */
cancelAnimFrame = (function () {
 return (
  window.cancelAnimationFrame    ||
  window.webkitCancelAnimationFrame ||
  window.mozCancelAnimationFrame  ||
  window.oCancelAnimationFrame   ||
  window.msCancelAnimationFrame   ||
  function(id){
   return window.clearTimeout(id);
  }
 );
})();
/**
 * Parse string to integer.
 * If the number is not positive or null
 * the method will return the default value
 * or 0 if undefined
 *
 * @param {string} value String to parse
 * @param {*} defaultValue Value to return if the result parsed is invalid
 * @return {number}
 *
 */
parsePositiveInt = function (value, defaultValue) {
 var output = parseInt(value, 10);
 return (output >= 0) ? output : defaultValue;
};
 if (typeof define === 'function' && define.amd) {
  // AMD. Register as an anonymous module.
  define([], function() {
   return Vivus;
  });
 } else if (typeof exports === 'object') {
  // Node. Does not work with strict CommonJS, but
  // only CommonJS-like environments that support module.exports,
  // like Node.
  module.exports = Vivus;
 } else {
  // Browser globals
  window.Vivus = Vivus;
 }
}(window, document)); 

总结

以上所述是小编给大家介绍的SVG动画vivus.js库使用小结(实例代码)，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对我们网站的支持！