如何在形状内夹一个圆圈

how to clip a circle inside a shape

它是一个形状里面有一个矩形。

-webkit-clip-path: polygon(0% 0%, 0% 100%, 25% 100%, 25% 25%, 75% 25%, 75% 75%, 25% 75%, 25% 100%, 100% 100%, 100% 0%);
clip-path: polygon(0% 0%, 0% 100%, 25% 100%, 25% 25%, 75% 25%, 75% 75%, 25% 75%, 25% 100%, 100% 100%, 100% 0%);

如何在里面夹一个圆圈?

改用mask

.box {
  display: inline-block;
  width: 200px;
  height: 200px;
  background: url(https://picsum.photos/id/100/800/800) center/cover;
  -webkit-mask: radial-gradient(circle 40px, #0000 98%, #fff);
          mask: radial-gradient(circle 40px, #0000 98%, #fff);
}
<div class="box"></div>

<div class="box" style="width:300px;height:300px"></div>

您可以让它响应如下:

.box {
  display:inline-block;
  width:200px;
  height:200px;
  background:url(https://picsum.photos/id/100/800/800) center/cover;
  -webkit-mask:radial-gradient(circle closest-side,#0000 calc(100% - 30px),#fff calc(100% - 32px));
          mask:radial-gradient(circle closest-side,#0000 calc(100% - 30px),#fff calc(100% - 32px));
}
<div class="box"></div>

<div class="box" style="width:300px;height:300px"></div>

您可以像这样使用在 svg 中绘制的路径:

img{-webkit-clip-path: url(#clip);;
clip-path: url(#clip);}
<img src="https://assets.codepen.io/222579/darwin300.jpg" />
<svg height="0" width="0" class="svg-clip" style="position:absolute">
        <defs>
             <clipPath id="clip" clipPathUnits="objectBoundingBox">
               <path d="M0,0 L1,0 1,1 0,1 0,0M.75,.5A.25,.25 0 1 0 .25,.5A.25,.25 0 1 0 .75,.5z" />
            </clipPath>
        </defs>
</svg>

请注意 clipPathUnits="objectBoundingBox" 并且路径的值介于 0 和 1 之间。此外,路径的第一部分是顺时针绘制的,而第二条路径(孔)是逆时针绘制的。