svg动画之动态描边效果

1、首先先做一个简单的线一点一点画出来的效果，主要使用svg中的“strokeDasharray”、“strokeDashoffset”属性，通过css3中的transtion改变strokeDashoffset来实现动画。

注：path中的数据通过在ai中划线后存储为svg格式就可以拿到；

效果图：

代码如下：

<svg class="move_line1" xmlns="http://www.w3.org/2000/svg" width="600px" height="150px">
 <path d="M62.9 14.9c-25-7.74-56.6 4.8-60.4 24.3-3.73 19.6 21.6 35 39.6 37.6 42.8 6.2 72.9-53.4 116-58.9 65-18.2 191
 101 215 28.8 5-16.7-7-49.1-34-44-34 11.5-31 46.5-14 69.3 9.38 12.6 24.2 20.6 39.8 22.9 91.4 9.05 102-98.9 176-86.7
 18.8 3.81 33 17.3 36.7 34.6 2.01 10.2.124 21.1-5.18 30.1" stroke="#000" stroke-width="4" fill="none">
 </path>
 </svg>
 <script>
 //svg 动画一般用transtion和animation
 var path1 = document.querySelector(".move_line1 path");
 var length1 = path1.getTotalLength();
 //清除动作
 path1.style.transtion = path1.style.WebkitTransition = "none";
 //设置起点
 path1.style.strokeDasharray = length1 + ' ' + length1;
 path1.style.strokeDashoffset = length1;
 //获取一个区域，获取相关的样式，让浏览器寻找一个起始点
 path1.getBoundingClientRect();
 //定义动作
 path1.style.transition = path1.style.WebkitTransition = 'stroke-dashoffset 2s ease-in-out';
 //GO
 path1.style.strokeDashoffset = '0';
 </script>

2、与画线的效果，接下来用同样的原理来画一个“蓝胖子”，蓝胖子同样是需要用ai画出来，将所有的元素存在数组里面遍历时改变transtion中的during和delay从而实现划线的先后顺序。

效果图：

代码如下：

<div class="move_line2">
 <svg xmlns="http://www.w3.org/2000/svg" width="600px" height="500px">
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
 M335.088,373.962c23.125-7.219,54.068,12.896,69.115,44.93s8.498,63.855-14.625,71.074c-23.125,7.221-54.068-12.895-69.115-44.928
 S311.965,381.183,335.088,373.962z"></path>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
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 c22.268,46.217,33.992,89.483,14.348,125.051c4.02-7.537,6.611-15.313,8.555-23.193c11.648,26.85,14.068,52.875-6.887,75.711
 c-64.363,13.082-86.986-18.811-194.209-8.391l-3.699-107.049l-0.92-22.406l0.873,22.42c-22.874-5.814-45.173-11.861-65.204-17.99
 l10.062-44.714l49.898,2.646c-43.949-22.82-74.717-76.747-73.621-131.665C51.125,69.85,122.487,5.053,209.983,9.426L209.983,9.426z
 "></path>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
 M127.866,299.414c53.621-10.396,87.391,17.968,94.62,65.603c4.205,55.014-54.168,83.619-90.647,43.756L127.866,299.414
 L127.866,299.414z"></path>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
 M129.575,285.055c66.294-2.505,120.602-16.571,186.912-12.424c7.652,1.256,7.152,14.774-1.5,16.288
 c-60.402-0.255-119.506,7.59-181.203,10.898c-14.98-0.357-17.425-6.778-13.476-11.896
C123.096,284.311,125.291,285.217,129.575,285.055L129.575,285.055z"></path>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
 M304.605,309.06c-8.162-29.413-11.222-57.848-11.791-87.262c-17.005,8.999-41.066-6.278-40.584-17.486
 c-7.021,31.961-10.248,65.548-9.677,100.763"></path>
 <ellipse fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" cx="279.449" cy="193.855" rx="30.133" ry="30.788"></ellipse>
 <circle fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" cx="90.681" cy="49.358" r="27.412"></circle>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
 M124.459,285.183c-36.085-18.873-63.232-58.725-71.063-102.821c-0.052-0.295-0.019-0.163-0.069-0.457
 c-43.423-5.859-35.264-73.124,0.427-55.668c0.067-0.353,0.019-0.145,0.088-0.496c8.143-41.139,34.012-75.528,69.743-96.045
 c98.492,58.677,146.511,142.883,108.603,245.678c-33.24,3.419-66.109,8.303-102.612,9.683
C127.472,285.135,125.873,284.957,124.459,285.183L124.459,285.183z"></path>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
M116.536,84.903c15.737,3.062,31.281,7.092,46.398,13.256"></path>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
M106.601,103.6c18.341,9.617,40.867,18.074,61.067,27.228"></path>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
M89.075,124.2c17.643,12.621,37.999,25.581,60.603,38.823"></path>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
M73.603,179.492c6.986,16.398,13.1,33.481,21.251,48.996c17.011,32.372,42.229,39.539,76.563,39.358
 c39.524-0.208,50.969-18.655,47.774-57.118C215.006,160.335,155.059,151.715,73.603,179.492L73.603,179.492z"></path>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
 M219.192,210.728c-4.165-50.15-63.557-58.928-144.414-31.635c-65.936,21.271-63.065-77.932-17.728-51.101"></path>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
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C155.131,267.931,140.898,266.362,128.618,261.235L128.618,261.235z"></path>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
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 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
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 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" d="M90.681,22.774c1.076,0,2.138,0.063,3.183,0.187
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 z"></path>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
 M133.591,410.618c-0.59-0.598-1.174-1.213-1.753-1.846l-2.156-59.363c14.439-5.217,36.941-4.068,65.022,1.484
C198.269,391.583,158.652,421.507,133.591,410.618L133.591,410.618z"></path>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" d="
M94.52,343.827c23.684,0,46.699,27.789,51.407,62.068s-10.676,62.068-34.359,62.068s-46.699-27.789-51.407-62.068
 S70.835,343.827,94.52,343.827z"></path>
 <circle fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" cx="45.643" cy="299.778" r="33.549"></circle>
 <line fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" x1="330.418" y1="358.101" x2="350.104" y2="352.659"></line>
 <circle fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.8347" stroke-miterlimit="2.4142" cx="356.516" cy="351.396" r="9.241"></circle>
 <circle fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.2677" stroke-miterlimit="2.4142" cx="144.495" cy="309.078" r="11.591"></circle>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="2.2677" stroke-miterlimit="2.4142" d=" M155.516,305.494c0.344,1.052,0.54,2.168,0.566,3.322l-23.157-0.421c0.067-1.153,0.305-2.262,0.687-3.3L155.516,305.494
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 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" d="M134.718,315.29c-0.978-1.533-1.605-3.309-1.771-5.207
 c0.481-0.335,1.067-0.533,1.701-0.533c1.619,0,2.938,1.291,2.938,2.871C137.587,313.979,136.305,315.253,134.718,315.29
 L134.718,315.29z"></path>
 <path fill-rule="evenodd" clip-rule="evenodd" fill="none" stroke="#000000" stroke-width="0.216" stroke-miterlimit="2.4142" d="
M136.491,313.87c1.044,1.918,2.604,3.514,5.015,4.564l-1.693,2.01l-5.378-5.162L136.491,313.87L136.491,313.87z"></path>
 </svg>
 </div>
 <script>
 (function() {
 function toArray(arr) {
 return Array.prototype.slice.call(arr);
 }
 var svg2 = document.querySelector('.move_line2 svg');
 svg2.parentNode.style.display = 'block';
 svg2.style.visibility = 'hidden';
 function fullSketch() {
 svg2.style.visibility = '';
 var paths = toArray(svg2.children);
 var begin = 0;
 var durations = paths.map(function(path2) {
  var length;
  console.log(path2.tagName);
  if(path2.tagName == "path"){
  length = path2.getTotalLength();
  }else if(path2.tagName == "ellipse"){
  length = Math.PI*path2.getAttribute("rx")*path2.getAttribute("ry");
  }else if(path2.tagName == "circle"){
  length = 2*Math.PI*path2.getAttribute("r");
  }else if(path2.tagName == "line"){
  var x_1=path2.getAttribute("x1"),y_1=path2.getAttribute("y1"),x_2=path2.getAttribute("x2"),y_2=path2.getAttribute("y2");
  length = Math.sqrt(Math.pow((x_1-x_2),2) + Math.pow((y_1-y_2),2));
  }
  path2.style.strokeDasharray = length + ' ' + length;
  path2.style.strokeDashoffset = length;
  return Math.pow(length, 0.5) * 0.02;
 });
 paths[0].getBoundingClientRect();
 paths.forEach(function(path, i) {
  path.style.transition = path.style.WebkitTransition = 'stroke-dashoffset ' + durations[i] + 's ' + begin + 's ease-in-out';
  path.style.strokeDashoffset = '0';
  path.setAttribute("class", "shade");
  begin += durations[i] + 0.1;
 });
 }
 window.addEventListener('load', fullSketch);
 }());
 </script>

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