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