> ## Documentation Index
> Fetch the complete documentation index at: https://hyperframes-fix-nested-composition-media-inpoint.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Particle Burst

> Keyword words trigger colored particle explosions

export const InstallCommand = ({command, item}) => {
  const [copied, setCopied] = React.useState(false);
  const [tuned, setTuned] = React.useState("");
  React.useEffect(() => {
    if (!item) return;
    const read = () => {
      try {
        const raw = new URLSearchParams(window.location.search).get(`vars-${item}`);
        if (!raw) return setTuned("");
        const parsed = JSON.parse(raw);
        if (!parsed || typeof parsed !== "object" || Array.isArray(parsed)) return setTuned("");
        if (Object.keys(parsed).length === 0) return setTuned("");
        setTuned(` --vars '${JSON.stringify(parsed)}'`);
      } catch {
        setTuned("");
      }
    };
    read();
    window.addEventListener("hf-vars-changed", read);
    window.addEventListener("popstate", read);
    return () => {
      window.removeEventListener("hf-vars-changed", read);
      window.removeEventListener("popstate", read);
    };
  }, [item]);
  const fullCommand = `${command}${tuned}`;
  const copy = async () => {
    try {
      if (navigator.clipboard && window.isSecureContext) {
        await navigator.clipboard.writeText(fullCommand);
      } else {
        const previous = document.activeElement;
        const scratch = document.createElement("textarea");
        scratch.value = fullCommand;
        scratch.setAttribute("readonly", "");
        scratch.style.position = "fixed";
        scratch.style.opacity = "0";
        document.body.appendChild(scratch);
        scratch.select();
        document.execCommand("copy");
        document.body.removeChild(scratch);
        previous?.focus?.();
      }
      setCopied(true);
      setTimeout(() => setCopied(false), 2000);
    } catch {}
  };
  return <div className="hf-install-command not-prose my-4 flex items-stretch overflow-hidden rounded-xl border border-zinc-200 bg-zinc-50 dark:border-zinc-800 dark:bg-zinc-900">
      <code className="flex-1 overflow-x-auto whitespace-nowrap border-r border-zinc-200 px-4 py-3 font-mono text-sm text-zinc-800 dark:border-zinc-800 dark:text-zinc-100">
        {fullCommand}
      </code>
      <button type="button" onClick={copy} data-copied={copied ? "true" : "false"} aria-label={`Copy ${command} to the clipboard`} className="hf-install-copy">
        <svg className="hf-install-copy-clipboard" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
          <path d="M14.25 5.25H7.25C6.14543 5.25 5.25 6.14543 5.25 7.25V14.25C5.25 15.3546 6.14543 16.25 7.25 16.25H14.25C15.3546 16.25 16.25 15.3546 16.25 14.25V7.25C16.25 6.14543 15.3546 5.25 14.25 5.25Z" />
          <path d="M2.80103 11.998L1.77203 5.07397C1.61003 3.98097 2.36403 2.96397 3.45603 2.80197L10.38 1.77297C11.313 1.63397 12.19 2.16297 12.528 3.00097" />
        </svg>
        <svg className="hf-install-copy-check" xmlns="http://www.w3.org/2000/svg" width="16" height="16" viewBox="0 0 18 18" fill="none" stroke="currentColor" strokeWidth="2" strokeLinecap="round" strokeLinejoin="round" aria-hidden="true">
          <path d="M2.75 9.5L6.5 13.25L15.25 4.5" />
        </svg>
      </button>
      <span className="hf-install-copy-status" role="status" aria-live="polite">
        {copied ? "Copied" : ""}
      </span>
    </div>;
};

<iframe className="w-full aspect-video rounded-xl border-0 bg-zinc-100 dark:bg-zinc-800" title="caption-particle-burst preview" loading="lazy" srcDoc={`<!doctype html><html><head><meta charset="utf-8"><style>html,body{margin:0;height:100%;overflow:hidden;background:transparent}hyperframes-player{display:block;width:100%;height:100%}</style><script src="https://cdn.jsdelivr.net/npm/@hyperframes/player@0.7/dist/hyperframes-player.global.js"><\/script></head><body><script>fetch("/public/catalog/components/caption-particle-burst.json").then(function(r){return r.json()}).then(function(d){var p=document.createElement("hyperframes-player");p.setAttribute("srcdoc",d.html);p.setAttribute("controls","");p.setAttribute("autoplay","");p.setAttribute("loop","");p.setAttribute("muted","");p.setAttribute("poster","https://static.heygen.ai/hyperframes-oss/docs/images/catalog/components/caption-particle-burst.png");document.body.appendChild(p)});<\/script></body></html>`} />

## Install

<InstallCommand command="npx hyperframes add caption-particle-burst" item="caption-particle-burst" />

That writes one file: `compositions/components/caption-particle-burst.html`.

## Source

<Accordion title={`caption-particle-burst.html`}>
  ```html theme={null}
  <!doctype html>
  <html lang="en">
    <head>
      <meta charset="UTF-8" />
      <meta name="viewport" content="width=1920, height=1080" />
      <title>Particle Burst</title>
      <link rel="preconnect" href="https://fonts.googleapis.com" />
      <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin />
      <link
        href="https://fonts.googleapis.com/css2?family=Outfit:wght@900&display=swap"
        rel="stylesheet"
      />
      <script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
      <style>
        *,
        *::before,
        *::after {
          box-sizing: border-box;
        }
        html,
        body {
          width: 1920px;
          height: 1080px;
          margin: 0;
          overflow: hidden;
          background: transparent;
        }
        #particle-burst {
          pointer-events: none;
          position: relative;
          width: 1920px;
          height: 1080px;
          overflow: hidden;
          background: transparent;
        }
        .bs-overlay {
          position: absolute;
          inset: 0;
          background: transparent;
          z-index: 1;
          pointer-events: none;
        }
        #bs-container {
          position: absolute;
          inset: 0;
          z-index: 10;
          pointer-events: none;
        }
        .bs-group {
          position: absolute;
          bottom: 120px;
          left: 0;
          width: 100%;
          display: flex;
          flex-wrap: wrap;
          align-items: flex-end;
          justify-content: center;
          gap: 24px;
          padding: 0 100px;
          opacity: 0;
          visibility: hidden;
        }
        .bs-word {
          font-family: "Outfit", sans-serif;
          font-weight: 900;
          font-size: 88px;
          text-transform: uppercase;
          color: rgba(255, 255, 255, 0.45);
          display: inline-block;
          letter-spacing: 0.05em;
          line-height: 1;
        }
        .bs-particle {
          position: absolute;
          width: 10px;
          height: 10px;
          border-radius: 50%;
          opacity: 0;
          pointer-events: none;
          z-index: 20;
          left: 960px;
          bottom: 180px;
        }
      </style>
    </head>
    <body>
      <div
        id="particle-burst"
        data-composition-id="caption-particle-burst"
        data-timeline-locked
        data-start="0"
        data-duration="8"
        data-fps="30"
        data-width="1920"
        data-height="1080"
      >
        <div class="bs-overlay"></div>
        <div id="bs-container"></div>
      </div>

      <script>
        (function () {
          window.__timelines = window.__timelines || {};

          var _fitCanvas = document.createElement("canvas");
          var _fitCtx = _fitCanvas.getContext("2d");
          function fitFontSize(text, baseFontSize, fontWeight, fontFamily, maxWidth) {
            var size = baseFontSize;
            var minSize = Math.floor(baseFontSize * 0.45);
            while (size > minSize) {
              _fitCtx.font = fontWeight + " " + size + "px " + fontFamily;
              if (_fitCtx.measureText(text).width <= maxWidth) return size;
              size -= 2;
            }
            return minSize;
          }

          function mulberry32(seed) {
            return function () {
              seed |= 0;
              seed = (seed + 0x6d2b79f5) | 0;
              var t = Math.imul(seed ^ (seed >>> 15), 1 | seed);
              t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t;
              return ((t ^ (t >>> 14)) >>> 0) / 4294967296;
            };
          }

          var WORDS = [
            { text: "Every", start: 0.0, end: 0.3 },
            { text: "great", start: 0.3, end: 0.55 },
            { text: "video", start: 0.55, end: 0.85 },
            { text: "starts", start: 0.85, end: 1.1 },
            { text: "with", start: 1.1, end: 1.25 },
            { text: "a", start: 1.25, end: 1.35 },
            { text: "single", start: 1.35, end: 1.65 },
            { text: "frame.", start: 1.65, end: 2.0 },
            { text: "HyperFrames", start: 2.1, end: 2.65 },
            { text: "lets", start: 2.65, end: 2.85 },
            { text: "you", start: 2.85, end: 2.95 },
            { text: "write", start: 2.95, end: 3.15 },
            { text: "HTML", start: 3.15, end: 3.55 },
            { text: "and", start: 3.55, end: 3.65 },
            { text: "render", start: 3.65, end: 3.95 },
            { text: "professional", start: 3.95, end: 4.45 },
            { text: "video.", start: 4.45, end: 4.8 },
            { text: "No", start: 4.9, end: 5.05 },
            { text: "timeline.", start: 5.05, end: 5.45 },
            { text: "No", start: 5.5, end: 5.65 },
            { text: "drag", start: 5.65, end: 5.85 },
            { text: "and", start: 5.85, end: 5.95 },
            { text: "drop.", start: 5.95, end: 6.25 },
            { text: "Just", start: 6.35, end: 6.55 },
            { text: "code", start: 6.55, end: 6.8 },
            { text: "that", start: 6.8, end: 6.95 },
            { text: "becomes", start: 6.95, end: 7.3 },
            { text: "cinema.", start: 7.3, end: 7.7 },
          ];

          // Keywords get particle burst + gold color
          var KEYWORDS = new Set([8, 12, 15, 24, 27]); // HyperFrames, HTML, professional, code, cinema.

          var RAW_GROUPS = [
            [0, 3],
            [4, 7],
            [8, 8],
            [9, 12],
            [13, 15],
            [16, 16],
            [17, 19],
            [20, 22],
            [23, 24],
            [25, 27],
          ];
          var GROUPS = RAW_GROUPS.map(function (pair, gi) {
            var ws = pair[0],
              we = pair[1];
            var nextStart = gi + 1 < RAW_GROUPS.length ? WORDS[RAW_GROUPS[gi + 1][0]].start : 8.0;
            var gEnd = Math.min(WORDS[we].end + 0.35, nextStart - 0.05);
            return { wordStart: ws, wordEnd: we, start: WORDS[ws].start, end: gEnd };
          });

          var PARTICLE_COLORS = [
            "#FFD700",
            "#FF6B35",
            "#FF3C78",
            "#9B5DE5",
            "#00BBF9",
            "#00F5D4",
            "#ffffff",
            "#F15BB5",
          ];
          var NUM_PARTICLES = 10;

          var container = document.getElementById("bs-container");
          var tl = gsap.timeline({ paused: true });

          GROUPS.forEach(function (g, gi) {
            var groupWords = WORDS.slice(g.wordStart, g.wordEnd + 1);
            var groupText = groupWords
              .map(function (w) {
                return w.text.toUpperCase();
              })
              .join(" ");
            var fontSize = fitFontSize(groupText, 88, "900", "'Outfit', sans-serif", 1720);
            var grp = document.createElement("div");
            grp.className = "bs-group";
            grp.id = "bs-grp-" + gi;

            groupWords.forEach(function (w, i) {
              var wi = g.wordStart + i;
              var span = document.createElement("span");
              span.className = "bs-word";
              span.id = "bs-w-" + wi;
              span.textContent = w.text.toUpperCase();
              span.style.fontSize = fontSize + "px";
              grp.appendChild(span);
            });

            container.appendChild(grp);
          });

          // Create particles for keyword words
          var particleData = {};
          WORDS.forEach(function (w, wi) {
            if (!KEYWORDS.has(wi)) return;
            var rng = mulberry32(wi * 137 + 99);
            particleData[wi] = [];
            for (var p = 0; p < NUM_PARTICLES; p++) {
              var angle = (p / NUM_PARTICLES) * Math.PI * 2 + rng() * 0.6;
              var dist = 120 + rng() * 200;
              var sz = 4 + rng() * 8;
              var dx = Math.cos(angle) * dist;
              var dy = -Math.sin(angle) * dist;
              var dot = document.createElement("div");
              dot.className = "bs-particle";
              dot.id = "bs-p-" + wi + "-" + p;
              dot.style.backgroundColor = PARTICLE_COLORS[p % PARTICLE_COLORS.length];
              dot.style.width = sz.toFixed(1) + "px";
              dot.style.height = sz.toFixed(1) + "px";
              container.appendChild(dot);
              particleData[wi].push({ el: dot, dx: dx, dy: dy });
            }
          });

          GROUPS.forEach(function (g, gi) {
            var grp = document.getElementById("bs-grp-" + gi);
            var groupWords = WORDS.slice(g.wordStart, g.wordEnd + 1);

            tl.set(grp, { visibility: "visible" }, g.start);
            tl.fromTo(
              grp,
              { opacity: 0, scale: 0.92 },
              { opacity: 1, scale: 1, duration: 0.2, ease: "back.out(1.5)" },
              g.start,
            );

            groupWords.forEach(function (w, i) {
              var wi = g.wordStart + i;
              var wordEl = document.getElementById("bs-w-" + wi);
              var isKW = KEYWORDS.has(wi);

              tl.to(
                wordEl,
                { color: isKW ? "#FFD700" : "#ffffff", scale: isKW ? 1.12 : 1.05, duration: 0.08 },
                w.start,
              );
              tl.to(wordEl, { color: "rgba(255,255,255,0.4)", scale: 1.0, duration: 0.1 }, w.end);

              if (isKW && particleData[wi]) {
                particleData[wi].forEach(function (pd, pi) {
                  tl.set(pd.el, { x: 0, y: 0, opacity: 0 }, w.start);
                  tl.to(
                    pd.el,
                    { x: pd.dx, y: pd.dy, opacity: 1, duration: 0.12, ease: "power3.out" },
                    w.start + pi * 0.018,
                  );
                  tl.to(
                    pd.el,
                    { opacity: 0, duration: 0.45, ease: "power1.in" },
                    w.start + 0.12 + pi * 0.018,
                  );
                  tl.set(pd.el, { opacity: 0, x: 0, y: 0 }, w.start + 0.7);
                });
              }
            });

            tl.to(grp, { opacity: 0, duration: 0.14, ease: "power2.in" }, g.end - 0.14);
            tl.set(grp, { opacity: 0, visibility: "hidden" }, g.end);
          });

          tl.seek(0);
          window.__timelines["caption-particle-burst"] = tl;
        })();
      </script>
    </body>
  </html>
  ```
</Accordion>

## Usage

Open `compositions/components/caption-particle-burst.html` and paste its contents into your composition. See the comment header in the file for detailed instructions.

Tagged `captions` `caption-style` `particles` `burst` `effects`.

## Related topics

* [Browse the complete Catalog](/catalog)
* [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
* [Build a richer composition](/go-further)
