Install
That writescompositions/components/hw-boil.html, plus 1 supporting file under assets/fonts/.
Paste it into your composition
Opencompositions/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
hw-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>
handwritten effect annotation.