css - 如何设置 SVG 路径元素的亮度

Question

我想在 SVG 的特定路径元素上应用亮度。

<svg xmlns="http://www.w3.org/2000/svg" style="top: 20px; left:15px; position: absolute; z-index: 0; background: none; width:528px; height: 418px;"
viewBox="32 0 470 432">
<defs>
 <style>
  .cls-1H{fill:#ed1c24}.cls-2H{fill:#ff7500; filter: brightness(2)}.cls-3H{fill:#82c341}.cls-4H{fill:#41d3ff}
</style>
</defs>
<path id="Path_139" d="M1314.486 1130.389l-8.164-5.659a257.023 257.023 0 0 0 24.271-43.518l9.1 3.973a267.1 267.1 0 0 1-25.207 45.204z" class="cls-1H" data-name="Path 139" transform="translate(-826.518 -710.46)"/>
<path id="Path_140" d="M1343.569 1075.834l-9.248-3.625a256.932 256.932 0 0 0 14.831-55.424l9.823 1.479a266.837 266.837 0 0 1-15.406 57.57z" class="cls-2H" data-name="Path 140" transform="translate(-826.518 -710.46)"/>
<path id="Path_141" d="M1360.292 1008.228l-9.873-1.1a257.522 257.522 0 0 0 1.591-28.53v-.421a261.5 261.5 0 0 0-1.55-28.435l9.875-1.084a271.611 271.611 0 0 1 1.608 29.52v.42a267.719 267.719 0 0 1-1.651 29.63z" class="cls-3H" data-name="Path 141" transform="translate(-826.518 -710.46)"/>
<path id="Path_142" d="M1349.213 940.075a256.583 256.583 0 0 0-14.7-55.44l9.255-3.606a266.481 266.481 0 0 1 15.268 57.591z" class="cls-4H" data-name="Path 142" transform="translate(-826.518 -710.46)"/>
</svg>

我正在使用 filter: brightness(2) css 属性。如果我在 SVG 元素上应用此属性，则该属性工作正常。但是在路径元素中，它不起作用。 根据我的要求，我想有条件地突出显示特定路径元素。

Answer 1

您不能在 path 元素上添加 filter css 属性。这是行不通的。

但是你可以使用 filter元素并直接在 svg html 代码中将其应用于您想要的 path。

尝试使用 rgb 值以获得您想要的结果。

在这里阅读更多 -> feComponentTransfer

performs color-component-wise remapping of data for each pixel. It allows operations like brightness adjustment, contrast adjustment, color balance or thresholding.

这里有一个很好的文档 -> filters-to-adjust-brightness

SVG filter is slightly more complex, though mainly to give you greater control, as it allows you to change the brightness of each color channel independently instead of changing all or none.

<svg xmlns="http://www.w3.org/2000/svg" style="top: 0px; left:15px; position: absolute; z-index: 0; background: none; width:528px; height: 418px;" viewBox="32 0 470 432" id="mySVG">
  <defs>
    <style>
      .cls-1H {
        fill: #ed1c24
      }

      .cls-2H {
        fill: #ff7500
      }

      .cls-3H {
        fill: #82c341
      }

      .cls-4H {
        fill: #41d3ff
      }

    </style>
  </defs>
  <filter id="my-filter">
    <feComponentTransfer>
      <feFuncR type="linear" slope="2" />
      <feFuncG type="linear" slope="2" />
      <feFuncB type="linear" slope="2" />
    </feComponentTransfer>
  </filter>

  <path id="Path_139" d="M1314.486 1130.389l-8.164-5.659a257.023 257.023 0 0 0 24.271-43.518l9.1 3.973a267.1 267.1 0 0 1-25.207 45.204z" class="cls-1H" data-name="Path 139" transform="translate(-826.518 -710.46)" />
  <path id="Path_140" d="M1343.569 1075.834l-9.248-3.625a256.932 256.932 0 0 0 14.831-55.424l9.823 1.479a266.837 266.837 0 0 1-15.406 57.57z" class="cls-2H" data-name="Path 140" transform="translate(-826.518 -710.46)" />
  <path id="Path_141"  filter="url(#my-filter)" d="M1360.292 1008.228l-9.873-1.1a257.522 257.522 0 0 0 1.591-28.53v-.421a261.5 261.5 0 0 0-1.55-28.435l9.875-1.084a271.611 271.611 0 0 1 1.608 29.52v.42a267.719 267.719 0 0 1-1.651 29.63z" class="cls-3H" data-name="Path 141" transform="translate(-826.518 -710.46)" />
  <path id="Path_142" filter="url(#my-filter)" d="M1349.213 940.075a256.583 256.583 0 0 0-14.7-55.44l9.255-3.606a266.481 266.481 0 0 1 15.268 57.591z" class="cls-4H" data-name="Path 142" transform="translate(-826.518 -710.46)" />
</svg>