> ## Documentation Index
> Fetch the complete documentation index at: https://hyperframes-miao-template-slot-semantics.mintlify.site/llms.txt
> Use this file to discover all available pages before exploring further.

# Hand-Drawn Boil

> Hand-drawn jitter that re-poses every N frames, as seek-safe helpers: pose derives from quantized timeline time through a seeded hash; includes the shared onUpdate dispatcher, a wobbled-ellipse path generator, the boil pose control (off/calm/lively over the family-locked frameDrop), a curvature-adaptive pen-velocity ease, and the completed stroke matrix (plain/soft/sharp/spray — spray is index-seeded deterministic dots, no turbulence) with texture-safe draw-on

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="hw-boil 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@latest/dist/hyperframes-player.global.js"><\/script></head><body><script>fetch("/public/catalog/components/hw-boil.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/hw-boil.png");document.body.appendChild(p)});<\/script></body></html>`} />

## Install

<InstallCommand command="npx hyperframes add hw-boil" item="hw-boil" />

That writes `compositions/components/hw-boil.html`, plus 1 supporting file under `assets/fonts/`.

## Paste it into your composition

Open `compositions/components/hw-boil.html` and copy what is inside into your own composition.

A component has no size or duration of its own. It takes both from the composition
you paste it into.

## Source

<Accordion title={`hw-boil.html`}>
  ```html theme={null}
  <!doctype html>
  <html lang="en">
    <head>
      <meta charset="utf-8" />
      <script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
      <style>
        /* Caveat is NOT auto-resolved by the renderer — bundle it. Asset
           paths are ROOT-RELATIVE (the project root is the base URL for all
           compositions; ../ traversal is a lint error). Registry installs
           ship the woff2 as an asset file targeting assets/fonts/. */
        @font-face {
          font-family: "Caveat";
          src: url("assets/fonts/Caveat-700-latin.woff2") format("woff2");
          font-weight: 700;
          font-display: block;
        }
        *,
        *::before,
        *::after {
          margin: 0;
          padding: 0;
          box-sizing: border-box;
        }
        body {
          background: transparent;
          overflow: hidden;
        }
        /* ---- hw-boil -----------------------------------------------------
           The hand-drawn "boil": jitter that re-poses only every N frames
           (quake + frame-drop style). Pose is a pure function of quantized
           timeline time through a seeded hash — fully seek-safe, renders
           identically on every pass over the same frame. Ships the control
           layer on top of the raw mechanic: hwBoilPose (the "boil" control —
           authored amp/rot poses over the family-locked frameDrop), the
           stroke matrix (hwStrokeTypes / hwStrokeApply / hwDrawOn — the
           "strokeType" control: plain | soft | sharp | spray; spray is
           index-seeded deterministic dots, NO feTurbulence anywhere) and the
           curvature-adaptive pen-velocity ease (hwPenEase).

           RULES:
           - hwBoil owns x/y/rotation of the boiled element.
             Transform-touching entrance/exit tweens go on a WRAPPER
             around it, never the boiled element (non-transform tweens
             like opacity don't contend and may ride it).
           - One timeline has ONE onUpdate — hwOnUpdate is the dispatcher
             that lets the boil coexist with sweep scalars etc. Register
             every onUpdate-style render through it.
           - Never boil an element carrying an SVG transform attribute —
             nest a positioning <g> (or div) and boil the clean inner group.
           - A textured path (sharp/spray) lives in its OWN svg inside the
             boiled wrapper, so the stroke-matrix mask in that svg's defs
             rides the boil with it (a mask left in a shared static svg
             would clip the texture at jitter extremes). */
        #hw-boil-root {
          --hw-font-print: "Caveat", cursive;
          --hw-font-script: "Caveat", cursive;
          --hw-ink: #f4f2ec;
          --hw-accent: #6d6dff;

          position: relative;
          width: 1920px;
          height: 1080px;
          overflow: hidden;
          background: #17161a;
          font-family: var(--hw-font-print, "Caveat", cursive);
        }
        #hw-boil-root svg {
          position: absolute;
          inset: 0;
          width: 100%;
          height: 100%;
        }
        #hw-boil-root path {
          fill: none;
          stroke: var(--hw-ink);
          stroke-width: 6;
          stroke-linecap: round;
          stroke-linejoin: round;
        }
        #hw-b-arrow {
          stroke: var(--hw-accent);
          stroke-width: 7;
        }
        .hw-b-label {
          position: absolute;
          font-weight: 700;
          font-size: 84px;
          color: var(--hw-ink);
          white-space: nowrap;
        }
        .hw-b-tag {
          position: absolute;
          font-family: "Inter", ui-sans-serif, sans-serif;
          font-weight: 500;
          font-size: 22px;
          letter-spacing: 0.12em;
          color: rgba(244, 242, 236, 0.62);
        }
      </style>
    </head>
    <body>
      <!-- Self-preview. WIRING: copy the hwOnUpdate / hwHash / hwBoil /
           hwWobbleEllipse helpers into your host script, then:

             hwBoil(tl, "#hw-my-annotation", { amp: 1.6, rot: 0.5, frameDrop: 3, seed: 2 });

           frameDrop 3-4 = classic boil; 1 = frantic; boil: off = don't call it.

           Control layer (copy alongside): hwBoilPose maps the "boil" control
           ("off" | "calm" | "lively") to authored amp/rot pairs over the
           family-locked frameDrop 3 —

             hwBoilPose(tl, "#hw-my-annotation", CONFIG.boil, { seed: 2 });

           The stroke matrix (hwStrokeTypes / hwStrokeApply / hwDrawOn, plus
           hwPenEase) maps the "strokeType" control ("plain" | "soft" |
           "sharp" | "spray") to authored textures. sharp/spray return a mask
           clone in applied.draw and hwDrawOn animates THAT (the visible
           texture never animates); { pen: true } rides the curvature-adaptive
           pen-velocity ease —

             var applied = hwStrokeApply(pathEl, CONFIG.strokeType, { seed: 4, id: "my-mask" });
             hwDrawOn(tl, applied, 0.3, 0.8, { pen: true });

           Unknown control values fall back to the declared default with a
           console error (bounded-controls law). -->
      <div
        id="hw-boil-root"
        data-composition-id="hw-boil"
        data-start="0"
        data-duration="4"
        data-width="1920"
        data-height="1080"
      >
        <svg viewBox="0 0 1920 1080">
          <g id="hw-b-arrow-g">
            <path
              id="hw-b-arrow"
              d="M 640 640 C 760 700, 980 720, 1130 620 M 1130 620 l -64 -6 M 1130 620 l -18 58"
            ></path>
          </g>
        </svg>
        <!-- the CONFIG element: own svg inside the boiled div — the
             stroke-matrix mask (in this svg's defs) rides the boil with it -->
        <div
          id="hw-b-circle-w"
          style="position: absolute; left: 250px; top: 470px; width: 420px; height: 300px"
        >
          <div id="hw-b-circle-g" style="position: absolute; inset: 0">
            <svg viewBox="0 0 420 300" style="overflow: visible">
              <path id="hw-b-circle"></path>
            </svg>
          </div>
        </div>
        <div class="hw-b-label" id="hw-b-word" style="left: 1230px; top: 560px">the boil</div>
        <div class="hw-b-tag" id="hw-b-tag-config" style="left: 350px; top: 782px">
          BOIL "CALM" · STROKE "PLAIN"
        </div>
        <div class="hw-b-tag" style="left: 940px; top: 782px">FRAME DROP 1</div>
        <div class="hw-b-tag" style="left: 1230px; top: 700px">TEXT, AMP 1.2</div>
        <div
          id="hw-b-drv"
          class="clip"
          data-start="0"
          data-duration="4"
          data-track-index="0"
          style="position: absolute; width: 1px; height: 1px; opacity: 0; pointer-events: none"
        ></div>
      </div>
      <script>
        (function () {
          window.__timelines = window.__timelines || {};

          var CONFIG = {
            // ── Controls (family base + 1 item-specific; comment grammar is the published-parameter list) ──
            boil: "calm", //        variant: "off" | "calm" | "lively" — authored amp/rot pairs over the family-locked frameDrop 3, applied to the demo circle; seed locked (family base)
            strokeType: "plain", // variant: "plain" | "soft" | "sharp" | "spray" — authored stroke texture on the demo circle (soft = blur; sharp = micro-dash dry marker; spray = seeded deterministic dots); draw-on rides the mask clone for textured types (4 params)

            // ── Locked (edit the item source to change) ─────────────────────
            // seeds, draw durations/eases, pen-velocity constants (kCurve 10,
            // floor 0.22), boil pose tables, frameDrop values, demo geometry
          };

          // ---- copy these helpers into the host script ----

          // Dispatcher: a GSAP timeline has ONE onUpdate. Register every
          // per-frame render (boils, sweep scalars) through this instead of
          // setting eventCallback directly, and they all coexist.
          window.hwOnUpdate = function (tl, fn) {
            if (!tl.__hwRenders) {
              tl.__hwRenders = [];
              tl.eventCallback("onUpdate", function () {
                for (var i = 0; i < tl.__hwRenders.length; i++) tl.__hwRenders[i]();
              });
            }
            tl.__hwRenders.push(fn);
            fn();
          };

          // Seeded hash -> [-1, 1]. Pure function of n — no Math.random().
          window.hwHash = function (n, seed) {
            var x = Math.sin(n * 127.1 + (seed || 1) * 311.7) * 43758.5453;
            return (x - Math.floor(x)) * 2 - 1;
          };

          // The boil. Owns x/y/rotation of its targets — put entrance tweens
          // on a wrapper. frameDrop = re-pose every N frames (3-4 classic).
          window.hwBoil = function (tl, target, opts) {
            opts = opts || {};
            var amp = opts.amp !== undefined ? opts.amp : 1.6;
            var rot = opts.rot !== undefined ? opts.rot : 0.5;
            var fps = opts.fps || 30;
            var drop = opts.frameDrop || 3;
            var seed = opts.seed || 1;
            var els = gsap.utils.toArray(target);
            window.hwOnUpdate(tl, function () {
              var step = Math.floor((tl.time() * fps) / drop);
              for (var i = 0; i < els.length; i++) {
                gsap.set(els[i], {
                  x: window.hwHash(step * 3 + i * 97, seed) * amp,
                  y: window.hwHash(step * 3 + 1 + i * 97, seed) * amp,
                  rotation: (opts.baseRot || 0) + window.hwHash(step * 3 + 2 + i * 97, seed) * rot,
                });
              }
            });
          };

          // The boil CONTROL: authored amp/rot poses over the family-locked
          // frameDrop 3; seed stays locked. Unknown pose → "calm" + console
          // error (bounded-controls law).
          window.hwBoilPose = function (tl, target, pose, opts) {
            opts = opts || {};
            var poses = { calm: { amp: 1.6, rot: 0.5 }, lively: { amp: 2.6, rot: 0.9 } };
            if (pose === "off") return;
            var p = poses[pose];
            if (!p) {
              console.error('hw: unknown boil pose "' + pose + '" — falling back to "calm"');
              p = poses.calm;
            }
            window.hwBoil(tl, target, { amp: p.amp, rot: p.rot, frameDrop: 3, seed: opts.seed || 1 });
          };

          // Seeded hand-wobbled ellipse path (smooth quadratic chain).
          window.hwWobbleEllipse = function (cx, cy, rx, ry, seed, wobblePct) {
            wobblePct = wobblePct === undefined ? 3 : wobblePct;
            var N = 14,
              pts = [];
            for (var i = 0; i < N; i++) {
              var a = (i / N) * Math.PI * 2;
              var wr = 1 + window.hwHash(i * 13 + 5, seed) * (wobblePct / 100);
              pts.push([cx + Math.cos(a) * rx * wr, cy + Math.sin(a) * ry * wr]);
            }
            var mx = (pts[0][0] + pts[N - 1][0]) / 2,
              my = (pts[0][1] + pts[N - 1][1]) / 2;
            var d = "M" + mx.toFixed(1) + " " + my.toFixed(1);
            for (var j = 0; j < N; j++) {
              var p = pts[j],
                q = pts[(j + 1) % N];
              d +=
                " Q" +
                p[0].toFixed(1) +
                " " +
                p[1].toFixed(1) +
                " " +
                ((p[0] + q[0]) / 2).toFixed(1) +
                " " +
                ((p[1] + q[1]) / 2).toFixed(1);
            }
            return d;
          };

          /* ---- pen-velocity ease: pure function of the path geometry ----
             Sample 25–75 curvature-adaptive points, speed ∝ 1/(1+k·curvature)
             floored at 0.22 (a pen slows into curves, never stalls), integrate
             ds/speed, invert to a normalized time→distance ease. Seek-safe:
             no per-frame state. */
          window.hwPenEase = function (pathEl, opts) {
            opts = opts || {};
            var kCurve = opts.kCurve !== undefined ? opts.kCurve : 10;
            var L = pathEl.getTotalLength();
            if (L <= 0)
              return {
                ease: function (t) {
                  return t;
                },
                samples: 2,
                inkTime: 1,
                len: 0,
              };
            var PRE = 48;
            var pts = [];
            for (var i = 0; i <= PRE; i++) pts.push(pathEl.getPointAtLength((L * i) / PRE));
            var curv = [0];
            for (i = 1; i < PRE; i++) {
              var ax = pts[i].x - pts[i - 1].x,
                ay = pts[i].y - pts[i - 1].y;
              var bx = pts[i + 1].x - pts[i].x,
                by = pts[i + 1].y - pts[i].y;
              var la = Math.hypot(ax, ay) || 1e-6,
                lb = Math.hypot(bx, by) || 1e-6;
              var dot = Math.max(-1, Math.min(1, (ax * bx + ay * by) / (la * lb)));
              curv.push(Math.acos(dot) / ((la + lb) / 2));
            }
            curv.push(0);
            var mass = 0;
            for (i = 0; i < curv.length; i++) mass += curv[i];
            var N = Math.max(25, Math.min(75, Math.round(25 + mass * 18)));
            var seg = L / N;
            var times = [0];
            var t = 0;
            for (i = 1; i <= N; i++) {
              var u = ((i - 0.5) / N) * PRE;
              var i0 = Math.floor(u),
                f = u - i0;
              var c = curv[Math.min(i0, PRE)] * (1 - f) + curv[Math.min(i0 + 1, PRE)] * f;
              var speed = Math.max(1 / (1 + kCurve * c * 14), 0.22);
              t += seg / speed;
              times.push(t);
            }
            var total = times[N];
            for (i = 0; i <= N; i++) times[i] /= total;
            var easeFn = function (p) {
              if (p <= 0) return 0;
              if (p >= 1) return 1;
              var lo = 0,
                hi = N;
              while (hi - lo > 1) {
                var mid = (lo + hi) >> 1;
                if (times[mid] <= p) lo = mid;
                else hi = mid;
              }
              var span = times[hi] - times[lo] || 1e-9;
              return (lo + (p - times[lo]) / span) / N;
            };
            return { ease: easeFn, samples: N, inkTime: total, len: L };
          };

          /* ---- stroke matrix: plain | soft | sharp | spray ------------------
             strokeType is a variant control. Authored constants per type;
             unknown value → default ("plain") + console error (bounded-controls
             law). sharp = micro stroke-dasharray gaps (dry marker) — draw-on
             must therefore ride a MASK clone (the visible dasharray never
             animates). spray = index-seeded deterministic dots along the path
             via hwHash: position a pure function of path parameter + seed; NO
             feTurbulence anywhere.
             Returns { draw: pathToDashAnimate, group: maskedGroupOrNull } */
          window.hwStrokeTypes = {
            plain: {},
            soft: { blur: 0.6 },
            sharp: { dash: [3.0, 1.55] }, // × stroke-width
            spray: {
              coreOpacity: 0.5,
              coreBlur: 0.4,
              density: 0.16,
              scatter: 2.6,
              rMin: 1.1,
              rMax: 2.6,
            },
          };
          window.hwStrokeApply = function (pathEl, type, opts) {
            opts = opts || {};
            var cfg = window.hwStrokeTypes[type];
            if (!cfg) {
              console.error('hw: unknown strokeType "' + type + '" — falling back to "plain"');
              type = "plain";
              cfg = window.hwStrokeTypes.plain;
            }
            var svg = pathEl.ownerSVGElement;
            var ns = "http://www.w3.org/2000/svg";
            var w = parseFloat(getComputedStyle(pathEl).strokeWidth) || 6;
            if (type === "plain") return { draw: pathEl, group: null, type: type };
            if (type === "soft") {
              pathEl.style.filter = "blur(" + cfg.blur + "px)";
              return { draw: pathEl, group: null, type: type };
            }
            // sharp + spray: wrap in a masked group, draw-on animates the mask clone
            var id =
              opts.id ||
              "hwsm-" + Math.abs(Math.round(window.hwHash((opts.seed || 1) * 13.7, 5) * 1e6));
            var defs = svg.querySelector("defs");
            if (!defs) {
              defs = document.createElementNS(ns, "defs");
              svg.insertBefore(defs, svg.firstChild);
            }
            var mask = document.createElementNS(ns, "mask");
            mask.setAttribute("id", id);
            mask.setAttribute("maskUnits", "userSpaceOnUse");
            var clone = document.createElementNS(ns, "path");
            clone.setAttribute("d", pathEl.getAttribute("d"));
            clone.setAttribute("fill", "none");
            clone.setAttribute("stroke", "#fff");
            clone.setAttribute(
              "stroke-width",
              w * (type === "spray" ? 2 + (cfg.scatter * 2) / w : 1.7),
            );
            clone.setAttribute("stroke-linecap", "round");
            clone.setAttribute("stroke-linejoin", "round");
            mask.appendChild(clone);
            defs.appendChild(mask);
            var group = document.createElementNS(ns, "g");
            group.setAttribute("mask", "url(#" + id + ")");
            pathEl.parentNode.insertBefore(group, pathEl);
            group.appendChild(pathEl);
            if (type === "sharp") {
              pathEl.setAttribute(
                "stroke-dasharray",
                (cfg.dash[0] * w).toFixed(1) + " " + (cfg.dash[1] * w).toFixed(1),
              );
            } else {
              // spray: faint core + seeded dots
              pathEl.setAttribute("stroke-opacity", cfg.coreOpacity);
              pathEl.style.filter = "blur(" + cfg.coreBlur + "px)";
              var len = pathEl.getTotalLength();
              var n = Math.round(len * cfg.density * (opts.densityScale || 1));
              var seed = opts.seed || 1;
              var dots = document.createElementNS(ns, "g");
              for (var i = 0; i < n; i++) {
                var t = Math.min(
                  1,
                  Math.max(0, (i + 0.5) / n + (window.hwHash(i * 7, seed) * 0.35) / n),
                );
                var pt = pathEl.getPointAtLength(t * len);
                var pt2 = pathEl.getPointAtLength(Math.min(len, t * len + 0.5));
                var tx = pt2.x - pt.x,
                  ty = pt2.y - pt.y;
                var tl2 = Math.hypot(tx, ty) || 1;
                var nx = -ty / tl2,
                  nyv = tx / tl2;
                var off = window.hwHash(i * 7 + 1, seed) * (cfg.scatter + w * 0.55);
                var r = cfg.rMin + Math.abs(window.hwHash(i * 7 + 2, seed)) * (cfg.rMax - cfg.rMin);
                var c = document.createElementNS(ns, "circle");
                c.setAttribute("cx", (pt.x + nx * off).toFixed(1));
                c.setAttribute("cy", (pt.y + nyv * off).toFixed(1));
                c.setAttribute("r", r.toFixed(2));
                c.setAttribute("fill", getComputedStyle(pathEl).stroke);
                dots.appendChild(c);
              }
              group.appendChild(dots);
            }
            return { draw: clone, group: group, type: type };
          };

          /* Draw-on across the stroke matrix: dash-animate whatever
             hwStrokeApply says. Optionally pen-velocity eased (opts.pen: true). */
          window.hwDrawOn = function (tl, applied, at, dur, opts) {
            opts = opts || {};
            var p = applied.draw;
            var len = p.getTotalLength();
            // the draw target is always solid (plain/soft: the path itself; sharp/spray:
            // the mask clone — the visible path keeps its texture dasharray untouched)
            p.setAttribute("stroke-dasharray", len + " " + len);
            p.setAttribute("stroke-dashoffset", len);
            gsap.set(p, { opacity: 0 }); // kill the round-cap start nub pre-draw
            var ease = opts.pen ? window.hwPenEase(p, opts).ease : opts.ease || "power2.inOut";
            tl.set(p, { opacity: 1 }, at);
            tl.to(
              p,
              { strokeDashoffset: 0, duration: dur === undefined ? 0.7 : dur, ease: ease },
              at,
            );
          };

          // ---- self-preview (not part of the snippet you copy) ----
          var circle = document.getElementById("hw-b-circle");
          circle.setAttribute("d", window.hwWobbleEllipse(210, 150, 190, 130, 4, 3.2));

          document.getElementById("hw-b-tag-config").textContent = (
            'boil "' +
            CONFIG.boil +
            '" · stroke "' +
            CONFIG.strokeType +
            '"'
          ).toUpperCase();

          var tl = gsap.timeline({ paused: true });

          /* the CONFIG circle rides the stroke matrix: texture from
             CONFIG.strokeType, draw-on through the mask-safe hwDrawOn with the
             pen-velocity ease (strokeDashoffset — never x/y, the boil owns those) */
          var applied = window.hwStrokeApply(circle, CONFIG.strokeType, { seed: 4, id: "hw-b-mask" });
          window.hwDrawOn(tl, applied, 0.3, 0.8, { pen: true });

          /* raw draw-on entrance for the arrow (not routed through the matrix) */
          var arrow = document.getElementById("hw-b-arrow");
          var alen = arrow.getTotalLength();
          gsap.set(arrow, { strokeDasharray: alen, strokeDashoffset: alen });
          tl.to(arrow, { strokeDashoffset: 0, duration: 0.8, ease: "power2.inOut" }, 0.65);

          gsap.set("#hw-b-word", { opacity: 0 });
          tl.to("#hw-b-word", { opacity: 1, duration: 0.5, ease: "power2.out" }, 1.1);

          /* three boils with different characters, one dispatcher: the circle
             rides the boil CONTROL (CONFIG.boil → authored pose); arrow + word
             keep raw hwBoil calls — the multi-character demo */
          window.hwBoilPose(tl, "#hw-b-circle-g", CONFIG.boil, { seed: 2 });
          window.hwBoil(tl, "#hw-b-arrow-g", { amp: 2.6, rot: 0.7, frameDrop: 1, seed: 5 });
          window.hwBoil(tl, "#hw-b-word", { amp: 1.2, rot: 0.35, frameDrop: 3, seed: 9 });

          tl.set("#hw-boil-root", { visibility: "hidden" }, 3.98);
          window.__timelines["hw-boil"] = tl;
        })();
      </script>
    </body>
  </html>
  ```
</Accordion>

Tagged `handwritten` `effect` `annotation`.

## Related topics

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