baseFrequency

Baseline Widely available

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

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:

示例

示例 1

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>

使用说明

<number-optional-number>
默认值 0
动画性
<number-optional-number>

如果提供了两个数字,第一个数字表示水平方向的基础频率,第二个数字表示垂直方向的基础频率。如果提供了一个数字,则该值同时作用于 x 轴 和 y 轴。

禁止使用负值。

规范

Specification
Filter Effects Module Level 1
# element-attrdef-feturbulence-basefrequency

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
baseFrequency

Legend

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Full support
Full support
See implementation notes.