<div class="content">
  <h1>A Simple Generative UI</h1>
  <p>Click the button below, and watch the background pattern and heading styles change!</p>
  <button>Regenerate</button>
</div>

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background: #1d1934;
  color: #1d1934;
  font-family: system-ui;
  line-height: 1.5;
  padding: 2rem;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

svg {
  position: absolute;
  top: 0rem;
  left: 0rem;
  width: calc(100% - 0rem);
  height: calc(100% - 0rem);
}

.content {
  position: relative;
  z-index: 1;
  padding: 2.5rem;
  color: #fff;
  background: hsla(250, 35%, 15%, 0.7);
  box-shadow: 0 8px 32px 0 hsla(250, 35%, 5%, 1);
  backdrop-filter: blur(8px) saturate(100%);
  -webkit-backdrop-filter: blur(8px) saturate(100%);
  border-radius: 1.25rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-top-left-radius: 2.5rem;
  border-bottom-right-radius: 2.5rem;
}

.content > * + * {
  margin-top: 2rem;
}

h1 {
  position: relative;
  display: inline-block;
  line-height: 1;
  letter-spacing: -0.025em;
  padding-bottom: 1.5rem;
}

h1:after {
  position: absolute;
  bottom: 0;
  left: 0;
  content: "";
  height: 4px;
  width: 100%;
  background: #ffd53d;
}

h1.rotate-left:after {
  transform: rotate(1deg);
}

h1.rotate-right:after {
  transform: rotate(-1deg);
}

button {
  width: 100%;
  height: 2.75rem;
  background: #7257fa;
  border: 0;
  font-size: 1rem;
  color: #fff;
  font-weight: 600;
  cursor: pointer;
  border-radius: 0.5rem;
  box-shadow: 0 4px 16px 0 hsla(250, 35%, 5%, 0.125);
}

import { SVG } from "https://cdn.skypack.dev/@svgdotjs/svg.js";
import {
  createVoronoiTessellation,
  random,
  randomBias,
  randomSnap,
  createNoiseGrid,
  map
} from "https://cdn.skypack.dev/@georgedoescode/generative-utils";

const width = 196;
const height = 196;

const svg = SVG()
  .viewbox(0, 0, width, height)
  .attr("preserveAspectRatio", "xMidYMid slice");

svg.addTo("body");

function regenerate() {
  svg.clear();

  const grid = createNoiseGrid({
    width,
    height,
    resolution: 48,
    xInc: 0.0125,
    yInc: 0.0125,
    seed: Math.random() * 1000
  });

  const points = [...Array(96)].map(() => {
    return {
      x: random(0, width),
      y: random(0, height)
    };
  });

  const tessellation = createVoronoiTessellation({
    width,
    height,
    points,
    relaxIterations: 24
  });

  const debug = false;

  tessellation.cells.forEach((cell) => {
    const noiseValue = grid.lookup({
      x: cell.centroid.x,
      y: cell.centroid.y
    }).noiseValue;

    svg
      .line(
        cell.centroid.x - cell.innerCircleRadius / 2,
        cell.centroid.y - cell.innerCircleRadius / 2,
        cell.centroid.x + cell.innerCircleRadius / 2,
        cell.centroid.y + cell.innerCircleRadius / 2
      )
      .stroke({
        width: cell.innerCircleRadius / 2,
        color: random(["#F9F9FC", "#FFD53D", "#7257FA"])
      })
      .rotate(map(noiseValue, -1, 1, 0, 360))
      .scale(0.5);
  });

  const heading = document.querySelector("h1");
  if (Math.random() > 0.5) {
    heading.classList.remove("rotate-left");
    heading.classList.add("rotate-right");
  } else {
    heading.classList.remove("rotate-right");
    heading.classList.add("rotate-left");
  }
}

regenerate();

document.querySelector("button").addEventListener("click", regenerate);