baseFrequency - SVG: Scalable Vector Graphics 编辑

The baseFrequency attribute represents the base frequency parameter for the noise function of the <feTurbulence> filter primitive.

Only one element is using this attribute: <feTurbulence>

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

<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>

Usage notes

<number-optional-number>

If two numbers are provided, the first one represents the base frequency in the horizontal direction and the second one the base frequency in the vertical direction. If one number is provided, then that value is used for both x and y.

Negative values are forbidden.

Example

<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>

Specifications

Browser compatibility

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