旋转 SVG 蒙版
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【中文标题】旋转 SVG 蒙版【英文标题】：Rotating SVG mask 【发布时间】：2016-10-24 19:19:10 【问题描述】：我正在努力寻找一种方法来旋转这个 SVG 蒙版，以便它从中心内旋转。换句话说，我的目标是无限循环的旋转效果。另外，我不知道为什么它不会在 Firefox 中旋转。有任何想法吗？
这是JSFiddle
html：
<body class="home">
<svg preserveAspectRatio="xMidYMid slice">
<svg version="1.1" id="first-ring" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
xml:space="preserve">
<mask id="mask" maskUnits="userSpaceOnUse">
<rect x="0" y="0" />
<svg version="1.1" baseProfile="tiny" class="first-ring" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
x="0px" y="0px" viewBox="0 0 241.5 242" xml:space="preserve">
<g class ="first-ring-path">
<g>
<g>
<path d="M118.4,237.5c-8.5,0-16.9-0.9-25.1-2.7c-2.8-0.6-4.6-3.4-3.9-6.2c0.6-2.8,3.4-4.5,6.2-3.9
c7.5,1.6,15.2,2.5,22.9,2.5c20.7,0,40.7-6,58-17.3c2.4-1.6,5.6-0.9,7.2,1.5c1.6,2.4,0.9,5.6-1.5,7.2
C163.1,230.9,141.1,237.5,118.4,237.5z"/>
</g>
<g>
<path d="M192.5,209.2c-1.4,0-2.8-0.6-3.9-1.7c-1.9-2.1-1.7-5.4,0.4-7.3c3.9-3.5,7.5-7.3,10.9-11.3
c1.8-2.2,5.1-2.5,7.3-0.7s2.5,5.1,0.7,7.3c-3.6,4.4-7.7,8.6-11.9,12.4C195,208.7,193.7,209.2,192.5,209.2z"/>
</g>
<g>
<path d="M214.6,181.9c-0.9,0-1.8-0.2-2.6-0.7c-2.5-1.4-3.3-4.6-1.9-7.1c9.3-16,14.1-34.3,14.1-52.9
c0-4.9-0.3-9.8-1-14.5c-0.4-2.8,1.6-5.4,4.4-5.8c2.8-0.4,5.4,1.6,5.8,4.4c0.7,5.2,1.1,10.6,1.1,15.9c0,20.4-5.4,40.5-15.5,58.1
C218.1,181,216.4,181.9,214.6,181.9z"/>
</g>
<g>
<path d="M224.7,94.1c-2.2,0-4.3-1.4-4.9-3.7c-2.3-7.7-5.6-15.1-9.6-22.1c-1.4-2.5-0.6-5.6,1.9-7.1
c2.5-1.4,5.6-0.6,7.1,1.9c4.4,7.7,8,15.8,10.5,24.2c0.8,2.7-0.7,5.6-3.4,6.4C225.7,94,225.2,94.1,224.7,94.1z"/>
</g>
<g>
<path d="M206.4,58.7c-1.5,0-3.1-0.7-4.1-2c-10.9-14.2-25.3-25.4-41.7-32.5c-2.6-1.1-3.8-4.2-2.7-6.8
s4.2-3.8,6.8-2.7c17.9,7.8,33.7,20.2,45.7,35.7c1.7,2.3,1.3,5.5-0.9,7.2C208.6,58.3,207.5,58.7,206.4,58.7z"/>
</g>
<g>
<path d="M41,46.7c-1.3,0-2.7-0.5-3.7-1.6c-2-2-1.9-5.3,0.1-7.3C59.2,16.6,88,5,118.4,5c1.6,0,3.2,0,4.7,0.1
c2.9,0.1,5.1,2.5,5,5.4c-0.1,2.9-2.5,5.1-5.4,5c-1.4-0.1-2.9-0.1-4.3-0.1c-27.7,0-53.9,10.6-73.7,29.9
C43.6,46.2,42.3,46.7,41,46.7z"/>
</g>
<g>
<path d="M7.5,119c-0.1,0-0.2,0-0.4,0c-2.8-0.2-5-2.7-4.8-5.5c0.3-4,0.8-8.1,1.5-12.1C6,88.3,10.5,75.7,17,64.2
c1.4-2.5,4.6-3.4,7-2c2.5,1.4,3.4,4.6,2,7c-5.9,10.5-10,21.9-12.1,33.9c-0.6,3.6-1.1,7.4-1.3,11C12.4,116.9,10.2,119,7.5,119z"/>
</g>
<g>
<path d="M58.6,220c-1,0-1.9-0.3-2.8-0.8c-26.2-16.7-44.8-43.7-51.2-74c-0.6-2.8,1.2-5.5,4-6.1s5.5,1.2,6.1,4
c5.8,27.6,22.8,52.1,46.6,67.4c2.4,1.5,3.1,4.7,1.6,7.1C61.9,219.2,60.3,220,58.6,220z"/>
</g>
</g>
</g>
</svg>
</mask>
</svg>
<rect id="rect" mask="url(#mask)" x="0" y="0" />
</svg>
</body>
CSS：
html
height: 100%;
overflow:hidden;
font-weight:100;
body
height: 100%;
overflow:hidden;
svg
width: 100%;
height: 100%;
overflow:hidden;
svg mask rect
fill: rgba(255, 255, 255, 0.6);
svg > rect
fill: white;
// -webkit-mask: url(#mask);
// -moz-mask: url(#mask);
// mask: url(#mask);
.first-ring-path
-moz-animation:spin 20s infinite linear;
-webkit-animation:spin 20s infinite linear;
animation:spin 20s infinite linear;
@-moz-keyframes spin
0% -moz-transform:rotate(0deg);
100% -moz-transform:rotate(360deg);
@-moz-keyframes spinoff
0% -moz-transform:rotate(0deg);
100% -moz-transform:rotate(-360deg);
@-webkit-keyframes spin
0% -webkit-transform:rotate(0deg);
100% -webkit-transform:rotate(360deg);
@-webkit-keyframes spinoff
0% -webkit-transform:rotate(0deg);
100% -webkit-transform:rotate(-360deg);
【问题讨论】：
CSS 动画目前不适用于 Firefox 中的蒙版（这是一个已知错误）。不过 SMIL 应该可以工作。 【参考方案1】：假设我刚刚将相同的代码发布到 SMIL animation issue。只有 7 个衬垫，都是基于 old solution: How to Keep Text Orientation....
编辑：在最新的 FF v47（2016 年 6 月）上测试
var myPath = document.getElementById('pathRotate');
var i = 0;
var intervalID = window.setInterval(myCallback, 30);
function myCallback()
// Rotate the square by a small amount.
if (i == 360) i = 0
myPath.setAttribute("transform", "rotate(" + i + ", 121,121)");
++i;
body
background-color: red;
.home
background-image: url('../images/ontocore_home_background.jpg');
background-size: cover;
background-position: center;
background-attachment: fixed;
background-repeat: no-repeat;
.home-overlay
height: 4000;
background-image: url('../images/ontocore_home_overlay.png');
background-size: cover;
background-position: center;
background-attachment: fixed;
background-repeat: no-repeat;
svg
width: 100%;
height: 100%;
overflow:hidden;
svg mask rect
fill: rgba(255, 255, 255, 0.6);
svg > rect
fill: white;
// -webkit-mask: url(#mask);
// -moz-mask: url(#mask);
// mask: url(#mask);
<body class="home">
<svg preserveAspectRatio="xMidYMid slice">
<svg version="1.1" id="first-ring" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px"
xml:space="preserve">
<mask id="mask" maskUnits="userSpaceOnUse">
<rect x="0" y="0" />
<svg version="1.1" baseProfile="tiny" class="first-ring" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"
x="0px" y="0px" viewBox="0 0 241.5 242" xml:space="preserve">
<g id="pathRotate" class ="first-ring-path">
<g>
<g>
<path d="M118.4,237.5c-8.5,0-16.9-0.9-25.1-2.7c-2.8-0.6-4.6-3.4-3.9-6.2c0.6-2.8,3.4-4.5,6.2-3.9
c7.5,1.6,15.2,2.5,22.9,2.5c20.7,0,40.7-6,58-17.3c2.4-1.6,5.6-0.9,7.2,1.5c1.6,2.4,0.9,5.6-1.5,7.2
C163.1,230.9,141.1,237.5,118.4,237.5z"/>
</g>
<g>
<path d="M192.5,209.2c-1.4,0-2.8-0.6-3.9-1.7c-1.9-2.1-1.7-5.4,0.4-7.3c3.9-3.5,7.5-7.3,10.9-11.3
c1.8-2.2,5.1-2.5,7.3-0.7s2.5,5.1,0.7,7.3c-3.6,4.4-7.7,8.6-11.9,12.4C195,208.7,193.7,209.2,192.5,209.2z"/>
</g>
<g>
<path d="M214.6,181.9c-0.9,0-1.8-0.2-2.6-0.7c-2.5-1.4-3.3-4.6-1.9-7.1c9.3-16,14.1-34.3,14.1-52.9
c0-4.9-0.3-9.8-1-14.5c-0.4-2.8,1.6-5.4,4.4-5.8c2.8-0.4,5.4,1.6,5.8,4.4c0.7,5.2,1.1,10.6,1.1,15.9c0,20.4-5.4,40.5-15.5,58.1
C218.1,181,216.4,181.9,214.6,181.9z"/>
</g>
<g>
<path d="M224.7,94.1c-2.2,0-4.3-1.4-4.9-3.7c-2.3-7.7-5.6-15.1-9.6-22.1c-1.4-2.5-0.6-5.6,1.9-7.1
c2.5-1.4,5.6-0.6,7.1,1.9c4.4,7.7,8,15.8,10.5,24.2c0.8,2.7-0.7,5.6-3.4,6.4C225.7,94,225.2,94.1,224.7,94.1z"/>
</g>
<g>
<path d="M206.4,58.7c-1.5,0-3.1-0.7-4.1-2c-10.9-14.2-25.3-25.4-41.7-32.5c-2.6-1.1-3.8-4.2-2.7-6.8
s4.2-3.8,6.8-2.7c17.9,7.8,33.7,20.2,45.7,35.7c1.7,2.3,1.3,5.5-0.9,7.2C208.6,58.3,207.5,58.7,206.4,58.7z"/>
</g>
<g>
<path d="M41,46.7c-1.3,0-2.7-0.5-3.7-1.6c-2-2-1.9-5.3,0.1-7.3C59.2,16.6,88,5,118.4,5c1.6,0,3.2,0,4.7,0.1
c2.9,0.1,5.1,2.5,5,5.4c-0.1,2.9-2.5,5.1-5.4,5c-1.4-0.1-2.9-0.1-4.3-0.1c-27.7,0-53.9,10.6-73.7,29.9
C43.6,46.2,42.3,46.7,41,46.7z"/>
</g>
<g>
<path d="M7.5,119c-0.1,0-0.2,0-0.4,0c-2.8-0.2-5-2.7-4.8-5.5c0.3-4,0.8-8.1,1.5-12.1C6,88.3,10.5,75.7,17,64.2
c1.4-2.5,4.6-3.4,7-2c2.5,1.4,3.4,4.6,2,7c-5.9,10.5-10,21.9-12.1,33.9c-0.6,3.6-1.1,7.4-1.3,11C12.4,116.9,10.2,119,7.5,119z"/>
</g>
<g>
<path d="M58.6,220c-1,0-1.9-0.3-2.8-0.8c-26.2-16.7-44.8-43.7-51.2-74c-0.6-2.8,1.2-5.5,4-6.1s5.5,1.2,6.1,4
c5.8,27.6,22.8,52.1,46.6,67.4c2.4,1.5,3.1,4.7,1.6,7.1C61.9,219.2,60.3,220,58.6,220z"/>
</g>
</g>
</g>
</svg>
</mask>
<
</svg>
<rect id="rect" mask="url(#mask)" x="0" y="0" />
</svg>
</body>【讨论】：
【参考方案2】：从中心旋转
变换原点：50% 50%；
如下：
.first-ring-path
-moz-animation:spin 20s infinite linear;
-webkit-animation:spin 20s infinite linear;
animation:spin 20s infinite linear;
transform-origin: 50% 50%;
【讨论】：
真的有用吗？ I was pretty sure CSS animation of mask contents didn't. 在 Chrome 中工作...抱歉，我没有构建跨浏览器包。 是的，@RobertLongson 关于 CSS 动画在 Firefox 中无法用于遮罩的说法是正确的。你认为有更好的浏览器支持的 jQuery 替代品吗？ 这很可能通过 javascript 来完成。你想试试吗？以上是关于旋转 SVG 蒙版的主要内容，如果未能解决你的问题，请参考以下文章
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