SVG clipPath可以裁剪出“外部"内容 [英] SVG clipPath to clip the *outer* content out

问题描述

通常，<clipPath>元素会隐藏超出剪辑路径的所有内容.为了达到相反的效果-即从图像中切出"某些东西-我想在clipPath和clip-rule="evenodd"属性中使用两条路径.基本上，我想对剪辑路径进行异或"处理.

Normally, the <clipPath> element hides everything that is outshide the clip path. To achieve the opposite effect - that is to "cut out" something from the image - i want to use two paths in the clipPath and the clip-rule="evenodd" attribute. Basically, I want to "xor" the clip paths.

但是它不起作用.它显示了"ORed"区域:

But it doesn't work. It shows the region "ORed":

<clipPath clip-rule="evenodd" id="imageclippath" clipPathUnits = "objectBoundingBox">
        <rect clip-rule="evenodd" x="0.3" y="0.3" height="0.6" width="6" />
        <rect clip-rule="evenodd" x="0" y="0" height="0.5" width="0.5" />
    </clipPath>     

 <rect clip-path="url(#imageclippath)" x="0" y="0" height="500" width="500" fill="red"/>

我的问题是AFAIK <mask>在iOS WebKit中不起作用.

My problem is that AFAIK <mask> doesn't work in iOS WebKit.

推荐答案

使用面具可以轻松完成您要执行的操作，请参见

It's much easier to do what you're after with a mask, see this example. Here's the mask definition:

<mask id="maskedtext">
  <circle cx="50%" cy="50%" r="50" fill="white"/>
  <text x="50%" y="55%" text-anchor="middle" font-size="48">ABC</text>
</mask>

将保留蒙版内部为白色的区域，其他所有区域将被剪掉.

Regions that are white inside the mask will be kept, everything else will be clipped away.

这是另一个示例而不是使用clipPath，因为您需要使用path元素来应用clip-rule，所以它有点棘手.在那里使用clip-rule的clipPath看起来像这样:

Here's another example that uses clipPath instead, is a bit trickier since you need to use a path element to get the clip-rule to apply. The clipPath that uses clip-rule there looks like this:

<clipPath id="clipPath1">
  <path id="p1" d="M10 10l100 0 0 100 -100 0ZM50 50l40 0 0 40 -40 0Z" clip-rule="evenodd"/>
</clipPath>

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