> ## 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 Arrow

> Wobbled draw-on arrow with straight, gentle, and swoop curve poses, a four-way stroke texture matrix (plain/soft/sharp/spray), and a travel-aligned head-arrival stretch pulse with spring recovery; boils while on screen

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-arrow 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-arrow.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-arrow.png");document.body.appendChild(p)});<\/script></body></html>`} />

## Install

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

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

## Paste it into your composition

Open `compositions/components/hw-arrow.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-arrow.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>
        @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-arrow ------------------------------------------------------
           Hand-wobbled draw-on arrow, boiling, with a travel-aligned
           arrival stretch on the head. Position the wrapper, build with a
           CONFIG (arrowStyle / strokeType / boil), wire with a position
           only: hwArrowBuild + hwArrowOn / hwArrowOff. Requires the hw
           family helpers below (hwOnUpdate / hwHash / hwBoil / hwBoilPose /
           springEase / hwStrokeApply / hwDrawOn) in the host script. */
        .hw-arrow {
          position: absolute;
          pointer-events: none;
        }
        .hw-arrow svg {
          width: 100%;
          height: 100%;
          overflow: visible;
        }
        .hw-arrow path {
          fill: none;
          stroke: var(--hw-arrow-color, var(--hw-ink, #f4f2ec));
          stroke-width: var(--hw-arrow-w, 6);
          stroke-linecap: round;
          stroke-linejoin: round;
        }
        .hw-arrow.hw-soft path {
          filter: blur(0.6px);
        }
        /* self-preview scene */
        #hw-ar-scene {
          position: absolute;
          inset: 0;
          background: linear-gradient(135deg, #274060 0%, #123 100%);
          display: flex;
          align-items: center;
          justify-content: center;
          font-family: var(--hw-font-print, "Caveat", cursive);
          font-weight: 700;
          font-size: 80px;
          color: rgba(244, 242, 236, 0.92);
        }
      </style>
    </head>
    <body>
      <!-- Self-preview. WIRING (g09): copy the .hw-arrow CSS, the markup
           pattern (positioned wrapper + empty svg with a viewBox), and the
           helpers into your host. Build with a CONFIG, wire with a position
           only — the helper owns its durations, eases, and seeds:

             hwArrowBuild("#hw-my-arrow", {
               arrowStyle: "swoop",  // "straight" | "gentle" | "swoop"
               strokeType: "spray",  // "plain" | "soft" | "sharp" | "spray"
               boil: "calm",         // "off" | "calm" | "lively"
             });
             hwArrowOn(tl, "#hw-my-arrow", 2.0);
             hwArrowOff(tl, "#hw-my-arrow", 8.0);

           Each built target needs a UNIQUE id — the wobble seed and the
           sharp/spray mask id derive from it (an id-less target
           console.errors and falls back to a shared "hw-arrow" slot).

           Legacy single-path wiring (a <path> in the svg + hwArrowPath)
           keeps working exactly as before:

             document.querySelector("#hw-my-arrow path")
               .setAttribute("d", hwArrowPath(360, 160, "swoop", 3));
             hwArrowOn(tl, "#hw-my-arrow", 2.0);
             hwBoil(tl, "#hw-my-arrow", { frameDrop: 3, seed: 3 });
             hwArrowOff(tl, "#hw-my-arrow", 8.0);
      -->
      <div
        id="hw-ar-root"
        data-composition-id="hw-arrow"
        data-start="0"
        data-duration="4"
        data-width="1920"
        data-height="1080"
      >
        <div id="hw-ar-scene"><span>point at things</span></div>
        <div
          class="hw-arrow"
          id="hw-ar-demo"
          style="left: 560px; top: 320px; width: 380px; height: 180px"
        >
          <svg viewBox="0 0 380 180"></svg>
        </div>
        <div
          id="hw-ar-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 || {};

          /* ---- hw-boil helpers (shared family runtime — copy once per host) ---- */
          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();
          };
          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;
          };
          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,
                });
              }
            });
          };
          // boil control: authored poses over the family-locked frameDrop.
          // Unknown pose → default + 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 });
          };

          /* ---- spring library (snappy register; factory duration consumed verbatim) ---- */
          var LN1000 = Math.log(1000);
          var FEELS = {
            snappy: { zeta: 0.9, response: 0.22 },
          };
          window.springEase = function (opts) {
            var f = opts.feel ? FEELS[opts.feel] : opts;
            var zeta = f.zeta,
              response = f.response;
            var w0 = (2 * Math.PI) / response;
            var T = LN1000 / (zeta * w0);
            var x;
            if (zeta < 1) {
              var wd = w0 * Math.sqrt(1 - zeta * zeta);
              x = function (t) {
                return (
                  1 -
                  Math.exp(-zeta * w0 * t) *
                    (Math.cos(wd * t) + ((zeta * w0) / wd) * Math.sin(wd * t))
                );
              };
            } else {
              x = function (t) {
                return 1 - Math.exp(-w0 * t) * (1 + w0 * t);
              };
            }
            var xT = x(T);
            return {
              ease: function (p) {
                return p >= 1 ? 1 : x(p * T) / xT;
              },
              duration: T,
              zeta: zeta,
              response: response,
            };
          };

          /* ---- 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 g09 variant control. Authored constants per type;
             unknown value → default ("plain") + console error (bounded-controls
             law). sharp = micro stroke-dasharray gaps (dry marker) — draw-on
             therefore rides a MASK clone (the visible dasharray never animates).
             spray = index-seeded deterministic dots along the path via hwHash;
             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. The draw target is always solid (plain/soft: the path itself;
             sharp/spray: the mask clone — the visible path keeps its texture
             dasharray untouched). Optionally pen-velocity eased (opts.pen). */
          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,
            );
          };

          // ---- hw-arrow helpers (copy these too) ----
          // Wobbled arrow path in a w x h box, tail at left, head at right.
          // curve: "straight" | "gentle" | "swoop"
          window.hwArrowPath = function (w, h, curve, seed) {
            seed = seed || 1;
            var bend = curve === "swoop" ? 0.55 : curve === "gentle" ? 0.28 : 0.06;
            function wob(v, n, range) {
              return v + window.hwHash(n, seed) * range;
            }
            var x0 = wob(4, 1, 3),
              y0 = wob(h * 0.72, 2, 4),
              x1 = wob(w - 10, 3, 4),
              y1 = wob(h * 0.3, 4, 4);
            var cx1 = wob(w * 0.35, 5, 10),
              cy1 = wob(h * (0.72 + bend * 0.5), 6, 8);
            var cx2 = wob(w * 0.7, 7, 10),
              cy2 = wob(h * (0.3 + bend), 8, 8);
            var ang = Math.atan2(y1 - cy2, x1 - cx2);
            function head(da, len) {
              var a = ang + Math.PI + da;
              return (
                "M " +
                x1.toFixed(1) +
                " " +
                y1.toFixed(1) +
                " l " +
                (Math.cos(a) * len).toFixed(1) +
                " " +
                (Math.sin(a) * len).toFixed(1)
              );
            }
            return (
              "M " +
              x0.toFixed(1) +
              " " +
              y0.toFixed(1) +
              " C " +
              cx1.toFixed(1) +
              " " +
              cy1.toFixed(1) +
              ", " +
              cx2.toFixed(1) +
              " " +
              cy2.toFixed(1) +
              ", " +
              x1.toFixed(1) +
              " " +
              y1.toFixed(1) +
              " " +
              head(0.5, wob(34, 9, 6)) +
              " " +
              head(-0.5, wob(34, 10, 6))
            );
          };

          // ---- hwArrowBuild: CONFIG-reading component builder (g09) ----
          // Builds the arrow as TWO paths (curve + head group) inside the
          // target's svg with the same wobble math and seed slots as
          // hwArrowPath, applies CONFIG.strokeType to the curve (the head
          // stays plain — texture on a ~30px head reads as noise), and rigs
          // the travel-aligned arrival wrapper: an outer g rotated to the
          // travel direction + an inner g counter-rotated. The pair cancels,
          // so geometry stays put while scaleX on the outer acts along
          // travel. NO transform-box styles on these g's — they fight GSAP's
          // baked SVG origins (the outer's fill-box would derive from its
          // rotated child and the cancellation breaks).
          // `seed` is internal — defaults per target from the element id
          // (a pure hash of the id string: deterministic across page loads);
          // it is NOT a control. Targets must carry unique ids: id-less
          // targets fall back to a shared "hw-arrow" slot (identical wobble;
          // duplicate mask ids cross-wire sharp/spray reveals), so that case
          // fails loudly (bounded-controls law).
          window.hwArrowBuild = function (target, CONFIG, seed) {
            CONFIG = CONFIG || {};
            var el = typeof target === "string" ? document.querySelector(target) : target;
            var svg = el.querySelector("svg");
            if (!el.id)
              console.error(
                'hw: hwArrowBuild target has no id — falling back to the shared "hw-arrow" seed/mask slot; give each built target a unique id',
              );
            if (seed === undefined) {
              var idStr = el.id || "hw-arrow";
              seed = 0;
              for (var si = 0; si < idStr.length; si++)
                seed = (seed * 31 + idStr.charCodeAt(si)) % 997;
              seed = (seed % 96) + 1;
            }
            var style = CONFIG.arrowStyle === undefined ? "gentle" : CONFIG.arrowStyle;
            if (style !== "straight" && style !== "gentle" && style !== "swoop") {
              console.error('hw: unknown arrowStyle "' + style + '" — falling back to "gentle"');
              style = "gentle";
            }
            var vb = svg.viewBox.baseVal;
            var w = vb && vb.width ? vb.width : el.clientWidth;
            var h = vb && vb.height ? vb.height : el.clientHeight;
            // same wobble math + hash slots as hwArrowPath (1–8 body, 9/10 head)
            var bend = style === "swoop" ? 0.55 : style === "gentle" ? 0.28 : 0.06;
            function wob(v, n, range) {
              return v + window.hwHash(n, seed) * range;
            }
            var x0 = wob(4, 1, 3),
              y0 = wob(h * 0.72, 2, 4),
              x1 = wob(w - 10, 3, 4),
              y1 = wob(h * 0.3, 4, 4);
            var cx1 = wob(w * 0.35, 5, 10),
              cy1 = wob(h * (0.72 + bend * 0.5), 6, 8);
            var cx2 = wob(w * 0.7, 7, 10),
              cy2 = wob(h * (0.3 + bend), 8, 8);
            var ang = Math.atan2(y1 - cy2, x1 - cx2);
            function headSeg(da, len) {
              var a = ang + Math.PI + da;
              return (
                "M " +
                x1.toFixed(1) +
                " " +
                y1.toFixed(1) +
                " l " +
                (Math.cos(a) * len).toFixed(1) +
                " " +
                (Math.sin(a) * len).toFixed(1)
              );
            }
            var ns = "http://www.w3.org/2000/svg";
            var curve = document.createElementNS(ns, "path");
            curve.setAttribute(
              "d",
              "M " +
                x0.toFixed(1) +
                " " +
                y0.toFixed(1) +
                " C " +
                cx1.toFixed(1) +
                " " +
                cy1.toFixed(1) +
                ", " +
                cx2.toFixed(1) +
                " " +
                cy2.toFixed(1) +
                ", " +
                x1.toFixed(1) +
                " " +
                y1.toFixed(1),
            );
            svg.appendChild(curve);
            var headG = document.createElementNS(ns, "g");
            var headInner = document.createElementNS(ns, "g");
            var head = document.createElementNS(ns, "path");
            head.setAttribute("d", headSeg(0.5, wob(34, 9, 6)) + " " + headSeg(-0.5, wob(34, 10, 6)));
            headInner.appendChild(head);
            headG.appendChild(headInner);
            svg.appendChild(headG);
            // curve texture; mask id derived from the element id — deterministic
            // and collision-free across id-bearing instances (id-less targets
            // errored above and share the fallback)
            var applied = window.hwStrokeApply(
              curve,
              CONFIG.strokeType === undefined ? "plain" : CONFIG.strokeType,
              { seed: seed, id: (el.id || "hw-arrow") + "-sm" },
            );
            if (applied.group) {
              // the item CSS (.hw-arrow path) outranks the mask clone's
              // presentation attributes — pin them as inline styles so the
              // reveal mask keeps its authored width and white stroke
              applied.draw.style.stroke = "#fff";
              applied.draw.style.strokeWidth = applied.draw.getAttribute("stroke-width");
            }
            // arrival rig: rotate the WRAPPER to travel, counter-rotate the
            // content — wrapper scaleX then acts along travel
            var angDeg = (ang * 180) / Math.PI;
            gsap.set(headG, { transformOrigin: "50% 50%", rotation: angDeg, opacity: 0 });
            gsap.set(headInner, { transformOrigin: "50% 50%", rotation: -angDeg });
            el.__hwArrowBuild = {
              el: el,
              applied: applied,
              headG: headG,
              headInner: headInner,
              seed: seed,
              boil: CONFIG.boil === undefined ? "calm" : CONFIG.boil,
              boiled: false,
            };
            return el.__hwArrowBuild;
          };

          // Draw-on. Built targets (hwArrowBuild): accelerating draw (causal
          // arrival), then the head pops with the g21 travel-aligned stretch —
          // v measured numerically from the draw ease end-slope, S = min(0.06
          // × v/2000, 0.25), volume preserved (scaleX × scaleY ≈ 1, asserted),
          // 2-frame apply + snappy spring recovery (factory duration verbatim).
          // Legacy single-path targets keep the shipped dashoffset behavior.
          window.hwArrowOn = function (tl, target, at, dur) {
            var el = typeof target === "string" ? document.querySelector(target) : target;
            var b = el && el.__hwArrowBuild;
            if (!b) {
              var p = document.querySelector(target + " path");
              var len = p.getTotalLength();
              gsap.set(p, { strokeDasharray: len, strokeDashoffset: len });
              tl.to(
                p,
                {
                  strokeDashoffset: 0,
                  duration: dur === undefined ? 0.7 : dur,
                  ease: "power2.inOut",
                },
                at,
              );
              return;
            }
            // built targets (g09): durations are item-locked — a
            // legacy-signature `dur` is ignored + console.error (edit the item
            // source to change); the legacy branch above keeps honoring it
            if (dur !== undefined)
              console.error(
                "hw: hwArrowOn draw duration is locked for built targets — ignoring dur=" + dur,
              );
            dur = 0.7;
            // the pen ACCELERATES into the head (power2.in) so the measured
            // arrival velocity is real — a settling ease ends at ~zero slope
            // and would make the stretch invisible
            var drawEase = gsap.parseEase("power2.in");
            window.hwDrawOn(tl, b.applied, at, dur, { ease: drawEase });
            var dlen = b.applied.draw.getTotalLength();
            var eps = 1e-4;
            var v = ((drawEase(1) - drawEase(1 - eps)) / eps) * (dlen / dur);
            var S = Math.min(0.06 * (v / 2000), 0.25);
            var rec = window.springEase({ feel: "snappy" });
            var FPS = 30;
            var st = { s: 0 };
            var hg = b.headG;
            window.hwOnUpdate(tl, function () {
              // stretch ALONG travel (the wrapper's local x after rotation)
              var along = 1 + st.s;
              gsap.set(hg, { scaleX: along, scaleY: 1 / along });
              var ax = parseFloat(gsap.getProperty(hg, "scaleX"));
              var ay = parseFloat(gsap.getProperty(hg, "scaleY"));
              if (Math.abs(ax * ay - 1) > 0.01)
                console.error("hw volume law violated (arrowhead): " + (ax * ay).toFixed(4));
            });
            tl.set(hg, { opacity: 1 }, at + dur);
            tl.to(st, { s: S, duration: 2 / FPS, ease: "power3.out" }, at + dur);
            tl.to(st, { s: 0, duration: rec.duration, ease: rec.ease }, at + dur + 3 / FPS);
            // boil pose (recorded from CONFIG at build; hwBoil needs the
            // timeline, so it registers on first wiring). Boil owns x/y/rotation
            // of the WRAPPER element — the arrival stretch lives on the nested
            // head rig, never on the boiled element.
            if (!b.boiled) {
              b.boiled = true;
              window.hwBoilPose(tl, el, b.boil, { seed: b.seed });
            }
          };
          window.hwArrowOff = function (tl, target, at) {
            tl.to(target, { opacity: 0, duration: 0.3, ease: "power2.in" }, at);
          };

          // ---- self-preview ----
          var CONFIG = {
            // ── Controls (family base + 2 item-specific; comment grammar is the published-parameter list) ──
            arrowStyle: "gentle", // variant: "straight" | "gentle" | "swoop" — curve bend pose over the seeded wobble math (bend + both control points)
            strokeType: "plain", //  variant: "plain" | "soft" | "sharp" | "spray" — curve texture via hwStrokeApply (sharp/spray draw on a mask clone); head stays plain
            boil: "calm", //         variant: "off" | "calm" | "lively" — authored amp/rot pairs over the family-locked frameDrop 3; seed locked

            // ── Locked (edit the item source to change) ─────────────────────
            // seed (derived per target), draw ease (power2.in), arrival
            // softness 0.06, snappy spring recovery, durations
          };
          var tl = gsap.timeline({ paused: true });
          window.hwArrowBuild("#hw-ar-demo", CONFIG);
          window.hwArrowOn(tl, "#hw-ar-demo", 0.4);
          window.hwArrowOff(tl, "#hw-ar-demo", 3.4);
          tl.set("#hw-ar-root", { visibility: "hidden" }, 3.98);
          window.__timelines["hw-arrow"] = tl;
        })();
      </script>
    </body>
  </html>
  ```
</Accordion>

Tagged `handwritten` `annotation` `arrow` `overlay`.

## Related topics

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