baseFrequency

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨2015年7月⁩.

baseFrequency 属性表示 <feTurbulence> 滤镜原语的噪点函数的基础频率参数。

你可以将此属性与以下 SVG 元素一起使用：

<feTurbulence>

示例

示例 1

html,
body,
svg {
  height: 100%;
}

html

<svg viewBox="0 0 420 200" xmlns="http://www.w3.org/2000/svg">
  <filter id="noise1" x="0" y="0" width="100%" height="100%">
    <feTurbulence baseFrequency="0.025" />
  </filter>
  <filter id="noise2" x="0" y="0" width="100%" height="100%">
    <feTurbulence baseFrequency="0.05" />
  </filter>

  <rect x="0" y="0" width="200" height="200" style="filter: url(#noise1);" />
  <rect
    x="0"
    y="0"
    width="200"
    height="200"
    style="filter: url(#noise2); transform: translateX(220px);" />
</svg>

示例 2

html

<svg
  width="200"
  height="200"
  viewBox="0 0 220 220"
  xmlns="http://www.w3.org/2000/svg">
  <filter id="displacementFilter">
    <feTurbulence
      type="turbulence"
      baseFrequency="0.05"
      numOctaves="2"
      result="turbulence" />
    <feDisplacementMap
      in2="turbulence"
      in="SourceGraphic"
      scale="50"
      xChannelSelector="R"
      yChannelSelector="G" />
  </filter>

  <circle cx="100" cy="100" r="100" style="filter: url(#displacementFilter)" />
</svg>