css - 将阴影添加到 svg 多边形

Question

在附加的代码片段中，我有一个多边形，我需要添加一个效果使其看起来像这样:

我不知道如何在 svg 中执行此操作，如果它是 html，那么我想我会使用 box-shadow。

似乎唯一的解决方案是使用 filter但我想我只能在 <svg/> 上使用它元素，所以我正在努力如何做到这一点。

polygon {
  fill: #5091b9;
  stroke: #4387b0;
  stroke-width: 2;
}

<svg width="300" height="300">
  <g transform="translate(100, 100)">
    <polygon points="25.98076211353316,-14.999999999999998 25.98076211353316,14.999999999999998 1.83697019872103e-15,30 -25.98076211353316,14.999999999999998 -25.980762113533157,-15.000000000000004 -5.510910596163089e-15,-30" class="node-vertical__hexagon node-vertical__inactive">         </polygon>
  </g>
</svg>

Answer 1

您可以将 drop-shadow 滤镜应用于 SVG 或将 SVG 用作元素的背景并对其应用滤镜:

polygon {
  fill: #5091b9;
  stroke: #4387b0;
  stroke-width: 2;
}
.filter {
  filter: drop-shadow(10px 0 5px red);
}

.box {
  height: 100px;
  width: 100px;
  background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100" width="100"><g transform="translate(50, 50)"><polygon stroke="%234387b0" stroke-width="2" fill="%235091b9" points="25.98076211353316,-14.999999999999998 25.98076211353316,14.999999999999998 1.83697019872103e-15,30 -25.98076211353316,14.999999999999998 -25.980762113533157,-15.000000000000004 -5.510910596163089e-15,-30" ></polygon></g></svg>');
}

<p>SVG element</p>
<svg viewBox="0 0 100 100" width="100" class="filter"><g transform="translate(50, 50)" ><polygon points="25.98076211353316,-14.999999999999998 25.98076211353316,14.999999999999998 1.83697019872103e-15,30 -25.98076211353316,14.999999999999998 -25.980762113533157,-15.000000000000004 -5.510910596163089e-15,-30" ></polygon></g></svg>
<p>SVG as background</p>
<div class="box filter"></div>

您还可以考虑 SVG 过滤器:

.node-vertical__inactive {
  filter:url(#shadow);
}

.node-vertical__hexagon {
  fill: #5091b9;
  stroke: #4387b0;
  stroke-width: 2;
}

<svg>
<defs>
    <filter id="shadow" x="-20%" y="-20%" width="200%" height="200%">
      <feDropShadow dx="20" dy="3" stdDeviation="5" flood-color="#5091b9" />
    </filter>
  </defs>
<g class="vx-group" transform="translate(0, 0)">
  <g class="vx-group node-vertical__container" transform="translate(100, 100)"><svg class="node-vertical__inactive" x="0" y="0" style="overflow: visible;"><polygon points="25.98076211353316,-14.999999999999998 25.98076211353316,14.999999999999998 1.83697019872103e-15,30 -25.98076211353316,14.999999999999998 -25.980762113533157,-15.000000000000004 -5.510910596163089e-15,-30" class="node-vertical__hexagon"></polygon></svg>
</g>
</g>
</svg>