SVG 湍流过滤器测试

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html

<h1>
  SVG Turbulence Filter Test
</h1>
<p id="sentence" contenteditable="true" spellcheck="false">
  The <strong>feTurbulence</strong> SVG filter generates and renders <em>Perlin noise</em>. This can be used
  by CSS to distort <strong>elements and text</strong>. Try selecting or editing <em>this text</em>. You can fiddle
  with the sliders below to <strong>change the effect</strong>.
</p>

<div class="sliders">
  <div class="slider">
    <label for="turbulenceNumOctavesRange">Turbulence Number of Octaves</label>
    <output for="turbulenceNumOctavesRange" id="turbulenceNumOctavesRangeOutput"></output>
    <input class="slider__range" type="range" name="turbulenceNumOctavesRange" id="turbulenceNumOctavesRange" data-filter-id="turbulence" data-filter-attr="numOctaves" min="1" max="9" value="5" />
  </div>
  <div class="slider">
    <label for="turbulenceBaseFrequencyRange">Turbulence Base Frequency</label>
    <output for="turbulenceBaseFrequencyRange" id="turbulenceBaseFrequencyRangeOutput"></output>
    <input class="slider__range" type="range" name="turbulenceBaseFrequencyRange" id="turbulenceBaseFrequencyRange" data-filter-id="turbulence" data-filter-attr="baseFrequency" min="0.0001" max="0.002" step="0.0001" value="0.0002" />
  </div>
  <div class="slider">
    <label for="turbulenceBaseSeedRange">Turbulence Seed</label>
    <output for="turbulenceBaseSeedRange" id="turbulenceBaseSeedRangeOutput"></output>
    <input class="slider__range" type="range" name="turbulenceBaseSeedRange" id="turbulenceBaseSeedRange" data-filter-id="turbulence" data-filter-attr="seed" min="0" max="1000" step="1" value="500" />
  </div>
  <div class="slider">
    <label for="displacerScaleRange">Displacer Scale</label>
    <output for="displacerScaleRange" id="displacerScaleRangeOutput"></output>
    <input class="slider__range" type="range" name="displacerScaleRange" id="displacerScaleRange" data-filter-id="displacer" data-filter-attr="scale" min="1" max="100" value="50" />
  </div>
</div>

css

:root {
  --color-surface: Black;
  --color-background: PaleGoldenRod;
}

/* Box sizing rules */
*,
*::before,
*::after {
  box-sizing: border-box;
}

/* Remove default margin */
body,
h1,
h2,
h3,
h4,
p,
figure,
blockquote,
dl,
dd {
  margin: 0;
  font-size: 100%;
}

html {
  height: 100vh;
  line-height: 1.3;
  font-size: 87.5%;
  font-weight: 600;
  text-transform: uppercase;
  font-family: ui-monospace, Menlo, Monaco, "Cascadia Mono", "Segoe UI Mono",
    "Roboto Mono", "Oxygen Mono", "Ubuntu Monospace", "Source Code Pro",
    "Fira Mono", "Droid Sans Mono", "Courier New", monospace;
  display: grid;
  place-items: center;
  color: var(--color-surface);
  background-color: var(--color-background);
}

body {
  padding: 2rem;
  max-width: 74rem;
}

::selection {
  background: var(--color-surface);
  color: var(--color-background);
}

*:focus {
  outline: none;
}

*:focus-visible {
  outline: 3px solid currentColor;
  outline-offset: 3px;
}

h1 {
  margin-bottom: 2rem;
}

p {
  font-size: 4rem;
  font-size: clamp(2rem, 0.9349rem + 4.1420vw, 4rem);
  font-weight: normal;
  filter: url(#filter);
  border: 3px solid currentColor;
  padding: 0.75em;
  font-family: "Bebas Neue", sans-serif;
}

em {
  font-style: normal;
  font-weight: normal;
  text-decoration: underline;
  text-decoration-thickness: 0.1em;
  text-underline-offset: 0.05em;
}

strong {
  font-weight: normal;
  background-color: var(--color-surface);
  color: var(--color-background);
  padding: 0 0.25em;
}

label,
output,
h1 {
  font-size: inherit;
}

/* style for the range input */
input[type="range"] {
  --range__thumb-size: 1.5em;
  --range__border-width: 3px;
  --range__thumb-bgc: var(--color-background);
  -webkit-appearance: none;
  margin: 1em 0;
  width: 100%;
  display: block;
  color: inherit;
  background-color: transparent;
}

input[type="range"]::-webkit-slider-runnable-track {
  width: 100%;
  height: var(--range__border-width);
  cursor: pointer;
  background: currentColor;
  border: 0px solid currentColor;
}

input[type="range"]::-webkit-slider-thumb {
  border: var(--range__border-width) solid currentColor;
  height: var(--range__thumb-size);
  width: var(--range__thumb-size);
  background: var(--range__thumb-bgc);
  cursor: pointer;
  -webkit-appearance: none;
  margin-top: calc(
    -1 * calc(var(--range__thumb-size) / 2) + 1 * calc(var(
            --range__border-width
          ) / 2)
  );
}

input[type="range"]::-moz-range-track {
  width: 100%;
  height: var(--range__border-width);
  cursor: pointer;
  background: currentColor;
  border: 0px solid currentColor;
}

input[type="range"]::-moz-range-thumb {
  border-radius: 0;
  border: var(--range__border-width) solid currentColor;
  height: var(--range__thumb-size);
  width: var(--range__thumb-size);
  background: var(--range__thumb-bgc);
  cursor: pointer;
  -webkit-appearance: none;
  margin-top: calc(
    -1 * calc(var(--range__thumb-size) / 2) + 1 * calc(var(
            --range__border-width
          ) / 2)
  );
}

.sliders {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem 3rem;
}

.slider {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  gap: 0.5rem;
}

.slider input[type="range"] {
  grid-column: 1 / -1;
  grid-row: 2;
}

* + .sliders {
  margin-top: 3rem;
}

.filter {
  position: absolute !important;
  height: 1px; width: 1px; 
  overflow: hidden;
  clip: rect(1px 1px 1px 1px); 
  clip: rect(1px, 1px, 1px, 1px);
}

JavaScript

// set the value of the element turbulenceBaseSeedRange to a random number between 0 and 1000
document.getElementById("turbulenceBaseSeedRange").value = Math.floor(
  Math.random() * 1000
);
// set each atrribute of the filter of the svg element to the values of the corresponding range inputs based on the data-filter-id and data-filter-attr attributes and set the output element's value to the value of the range input when the input's value changes
const sliders = document.querySelectorAll(".slider__range");
const filter = document.querySelector(".filter");
sliders.forEach((slider) => {
  // set the output element to the value of the range input
  const output = slider.parentNode.querySelector("output");
  output.value = slider.value;
  const filterId = slider.dataset.filterId;
  const filterAttr = slider.dataset.filterAttr;
  const filterElement = filter.querySelector(`#${filterId}`);
  filterElement.setAttribute(filterAttr, slider.value);
  slider.addEventListener("input", function () {
    output.value = this.value;
    filterElement.setAttribute(filterAttr, this.value);
  });
});

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