baseFrequency

SVG 元素
1. A
2. B-C
3. D
  1. <defs>
  2. <desc>
4. E
  1. <ellipse>
5. F
6. G
7. H
  1. <hkern>
8. I
  1. <image>
9. J-L
  1. <line>
  2. <linearGradient>
10. M
11. N-P
12. Q-R
  1. <radialGradient>
  2. <rect>
13. S
  1. <script>
  2. <set>
  3. <stop>
  4. <style>
  5. <svg>
  6. <switch>
  7. <symbol>
14. T
15. U
  1. <use>
16. V-Z
  1. <view>
  2. <vkern>

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

You can use this attribute with the following SVG elements:

<feTurbulence>

范例

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>

用法注意事项

值	<number-optional-number>
默认值	`0`
Animatable	Yes

<number-optional-number>

范例

<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>

规范

规范	状态	注释
Filter Effects Module Level 1 The definition of 'baseFrequency' in that specification.	工作草案	无变化
Scalable Vector Graphics (SVG) 1.1 (Second Edition) The definition of 'baseFrequency' in that specification.	推荐	初始定义

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最后修改： Sep 23, 2021 , 由 MDN 贡献者