> ## Documentation Index
> Fetch the complete documentation index at: /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

# 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

**Hand-Drawn Boil**

```html hw-boil.html
<!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>
```

Copy npx hyperframes add hw-boil to the clipboard

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.

{/* hf:generated-footer */}

Tagged `handwritten` `effect` `annotation`.

## Related topics

* [Browse the complete Catalog](/catalog.md)
* [Add assets and Catalog items in the browser editor](/studio/assets-and-blocks.md)
* [Put blocks together into one video](/concepts/compositions.md)
