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hyperframes/docs/catalog/components/whiteboard-ink.mdx
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Miguel ÁngelandMiguel Angel Simon Sierra 1ae2067b8d feat(catalog): put the variables panel back, on payloads (#3199) 
* feat(catalog): put the variables panel back, on payloads

The panel drove its preview by loading an .html from docs/public, a type the
host does not publish, so it showed an empty frame in production and was
parked when the catalog was re-landed.

It now mounts the same JSON payload the plain player uses and re-mounts it as
values change, injecting them as window.__hfVariables into the composition head
before any of its scripts run, which is where the runtime reads overrides from.
Doing it in the markup rather than after load is what stops the composition
initialising with the wrong values first.

172 items with variables get the panel back; the playhead carries across a
change so a tweak mid-shot does not jump back to frame zero.

* fix(docs): drop the unused url form and the needless escapes

* fix(docs): the panel cannot reference a binding beside the export

* feat(catalog): make importing an SVG the obvious move

A reader arrives at this control with a shape, not with path data, and the
panel asked for the coordinates first. Import is now the primary action in a
drop target you can see is a drop target, and the raw path sits behind a
disclosure for anyone who wants it.

* feat(cli): let a fruitless catalog search report the gap

An agent that searches by meaning and finds nothing worth installing knows
something we do not: the name of a move the catalog is missing. There was no
way to tell us, so that knowledge was lost at the end of every run.

hyperframes feedback --search-miss "<query>" --wanted "<the move>" records it.
It carries no rating, so it never lands in the rating metric, and it is a
separate deliberate command rather than something catalog --query does on its
own: plain search still sends nothing, which is what the CLI promises.

--rating stops being required at the arg level, since a miss has no rating to
give. The check moved into the run body, where an absent one is now handled
rather than crashing on undefined.

* feat(cli): carry tuned variable values into the install snippet

Someone who tunes a block on its catalog page had no way to keep those values:
the install command was the same one everybody gets, and the tuning stayed on
the page.

hyperframes add <item> --vars '<json>' now prints a mount element carrying
data-variable-values, so the values land where the block is used.

They ride on the host rather than being written into the installed file. That
keeps the composition on disk byte-identical to the registry's, so a later
reinstall can still tell an edit from an update, and it lets two mounts of the
same block carry different values.

* fix(catalog): serve the item's own directory so runtime paths resolve

Some compositions assemble their asset URLs at run time —
"compositions/components/" + texture + ".png" for the texture masks, a font the
compiler pulled into _remote_media — and no scan of the markup can see a string
that does not exist until a script concatenates it. Those items either rendered
black or were dropped to a video that had never been uploaded.

Each item that needs it now has its prepared directory published, and its
payload carries a <base> pointing at it, so any relative path the composition
invents resolves. caption-texture renders its masks again, and
variable-font-flex has a preview at all for the first time: its MP4 and poster
are both 403.

Both layouts are published, because which one a composition asks for differs
per item, and a directory only earns that if it is under 2 MB. The 12 MB
texture sheet keeps the recorded video it already had.

* fix(catalog): let the variables panel actually drive the composition

Every control on the panel was inert. The values reached the composition and
nothing repainted, because the payload had already been compiled: compiling
inlines a mounted component and resolves its variables into the markup and CSS,
so by the time a reader turns a knob there is nothing left to change.

An item that declares variables now ships uncompiled, keeping the mount the
runtime loads at run time, which is the only state where data-variable-values
still means anything. The component travels inline as a data URI rather than a
sibling file, because .html is the one type the docs host will not publish. The
demo's own pinned values come off, so the reader's choices reach the mount
instead of losing to the values the demo picked to show itself off.

Measured on the rendered frame rather than the DOM: green rgb(98,207,144),
blue rgb(6,6,199), violet rgb(177,147,230), and back to green.

docs/public/catalog drops from 48 MB to 35 MB along the way, since an
uncompiled payload carries far less than an inlined one.

* feat(catalog): keep variable changes in the url

A reader who tuned a piece lost it on reload, and had nothing to send anyone.
The values now live in the query string, scoped by composition id so two links
never read each other,and only the ones that differ from the defaults are
written, so changing one knob gives a short URL rather than every variable
spelled out.

replaceState rather than pushState: dragging a slider should not leave a trail
of history entries. An unreadable value is ignored rather than thrown, so a
truncated or hand-edited link opens the piece at its defaults.

* fix(catalog): only rewrite the url when a value actually changed

* refactor(catalog): memoise the declared defaults on their content

* feat(catalog): offer an install command carrying the tuned values

The Install block is generated before anyone touches a knob, so it can only
ever print the plain command. Someone who spent a minute tuning a piece copied
it and got the defaults back.

The panel now carries its own command in the Snippet tab, with --vars holding
exactly the values that differ. An untouched piece still offers the same short
command, so nothing gets noisier for the common case.

* fix(catalog): a piece with nothing to render is a skip, not a failure

caption-blend-difference is a stylesheet and a paragraph of prose — a class you
add to your own captions, with no standalone scene to show. The generator
treated that as a build failure, so every run ended by reporting something
broken when nothing was.

It now reports the shape it is and keeps its recorded video, which is the only
honest preview such an item has. A genuine render failure still throws.

* fix(catalog): restore variables from the url on a cold load

A shared link opened at the defaults. The first render happens on the server,
where there is no window to read the query string from, and React then hydrates
against that markup and never revisits it — so the values only appeared once you
touched a control.

The URL is read again after mount, which is the first moment it exists. The
value is also escaped once now rather than twice: URLSearchParams already
decodes on the way out, and decoding a second time turned an SVG path full of
percent-escapes into something that no longer parsed, besides doubling the
length of every link.

* fix(catalog): mount the preview with the values a link carried

The frame was built from the declared defaults and the shared values were
posted to it afterwards, which is too late for anything the composition reads
once at init: a path arrived after the mark had already been drawn from the
default one, so a link looked right in the panel and wrong on screen.

* feat(catalog): the install command follows the values you tuned

Copying the Install line gave the plain command back, because that block is
generated before anyone touches a knob and had no way to know what changed. The
tuned command only existed in the panel Snippet tab, which is not where anyone
looks for it.

The line now reads the same query string the panel writes, so the two agree
without either component knowing the other exists, and a shared link carries the
right command too. replaceState fires no event, so the panel announces its own
writes.

* fix(catalog): send a text variable to the preview once it is finished

Every other control in the explorer reports a whole value on every event: a
slider at any position is a position, a swatch is a colour. A text field is
not. Typing v3 into a badge posted v first, so the preview remounted and
rendered a composition built from half a word.

The post now waits while a text field has focus and goes out when the edit is
committed, with Enter or by clicking away. The field itself is unchanged and
still tracks every keystroke.

---------

Co-authored-by: Miguel Angel Simon Sierra <miguelangelsi07@gmail.com>
2026-08-10 22:40:01 -04:00

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---
title: "Whiteboard Ink"
description: "A whiteboard sketch draws one measured stroke at a time while a pen nib follows the active tip. Preset sketches (bulb, flow, rocket) or your own multi-stroke SVG paths via the strokes slot; a path marked data-ink=accent rides the accent token."
---
import { InstallCommand } from "/snippets/install-command.jsx";
import { VariablesExplorer } from "/snippets/variables-explorer.jsx";
<VariablesExplorer
previewSrc="/public/catalog/components/whiteboard-ink.json"
compositionId="whiteboard-ink"
compositionSrc="compositions/components/whiteboard-ink.html"
variables={[{"id":"sketch","type":"enum","role":"content","label":"Sketch","description":"Authored preset sketch to draw. Ignored when the strokes slot holds custom paths.","default":"bulb","options":[{"value":"bulb","label":"Bulb"},{"value":"flow","label":"Flow"},{"value":"rocket","label":"Rocket"}]},{"id":"caption","type":"string","role":"content","label":"Caption","description":"Short line shown after the sketch completes.","default":"Draw the idea"},{"id":"pen","type":"enum","role":"style","label":"Pen","description":"Show or hide the pen nib actor.","default":"show","options":[{"value":"show","label":"Show"},{"value":"hide","label":"Hide"}]},{"id":"accent","type":"enum","role":"style","label":"Accent","description":"Color used by strokes marked data-ink=accent (one highlight stroke in each preset).","default":"green","options":[{"value":"green","label":"Green"},{"value":"blue","label":"Blue"},{"value":"violet","label":"Violet"}]},{"id":"exit","type":"enum","role":"style","label":"Exit","description":"How the completed lockup leaves. none holds the final frame.","default":"none","options":[{"value":"none","label":"None"},{"value":"fade","label":"Fade"},{"value":"up","label":"Up"}]}]}
>
```html whiteboard-ink.html
<!doctype html>
<!--
whiteboard-ink: HyperFrames video primitive (intros and reveals / ink draw)
A hand-authored SVG sketch draws one stroke at a time while a pen nib
samples the active path tip. The nib follows getPointAtLength during each
draw and takes a short lifted hop between strokes.
Strokes slot: the SVG ships an empty <g data-slot="strokes"> group. Fill it
with your own <path> elements (in your installed copy) and those paths
become the drawing; the sketch enum is ignored while the slot has paths.
Mark one path data-ink="accent" to route it through the accent token map.
Nib riding, per-stroke cadence, and the ink law are identical for slot
strokes and presets.
Variables:
- sketch (bulb / flow / rocket): authored preset sketch; ignored when the
strokes slot holds paths.
- caption (string): short line shown after the drawing completes.
- pen (show / hide): visibility of the traveling nib actor.
- accent (green / blue / violet): one highlight stroke routed through a
distinct contract token.
- exit (none / fade / up): how the completed lockup leaves. none holds
the final frame (frame roots own transitions); fade releases opacity
only; up adds the small upward drift.
Envelope, fixed IN and OUT with elastic HOLD only:
IN_BASE = 3.55s, 3.25s sequential draw phase, then pen exit and caption
HOLD = max(0, D - IN - OUT), dead-calm completed lockup
OUT_BASE = 0.45s when exit is fade or up, otherwise 0 (hold to the end)
If D is shorter than IN_BASE + OUT_BASE, IN and OUT compress together.
The timeline is never time-scaled.
Ink law: every selected path is measured once with getTotalLength. That
measurement owns its dash array, dash offset, cadence weight, and nib
sampling. Dashed geometry stays in native SVG user units.
Mount contract: the runtime clones only this template. #root fills the host
box, establishes the container query basis, has no data-width or data-height,
and registers one paused timeline under the literal whiteboard-ink key.
-->
<html
lang="en"
data-composition-id="whiteboard-ink"
data-composition-duration="5"
data-composition-variables='[
{ "id": "sketch", "type": "enum", "role": "content", "label": "Sketch", "description": "Authored preset sketch to draw. Ignored when the strokes slot holds custom paths.", "default": "bulb", "options": [{ "value": "bulb", "label": "Bulb" }, { "value": "flow", "label": "Flow" }, { "value": "rocket", "label": "Rocket" }] },
{ "id": "caption", "type": "string", "role": "content", "label": "Caption", "description": "Short line shown after the sketch completes.", "default": "Draw the idea" },
{ "id": "pen", "type": "enum", "role": "style", "label": "Pen", "description": "Show or hide the pen nib actor.", "default": "show", "options": [{ "value": "show", "label": "Show" }, { "value": "hide", "label": "Hide" }] },
{ "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Color used by strokes marked data-ink=accent (one highlight stroke in each preset).", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
{ "id": "exit", "type": "enum", "role": "style", "label": "Exit", "description": "How the completed lockup leaves. none holds the final frame.", "default": "none", "options": [{ "value": "none", "label": "None" }, { "value": "fade", "label": "Fade" }, { "value": "up", "label": "Up" }] }
]'
>
<head>
<meta charset="UTF-8" />
<title>Whiteboard Ink</title>
</head>
<body>
<template>
<div id="root" data-composition-id="whiteboard-ink" data-duration="5" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
#root {
position: absolute;
inset: 0;
overflow: hidden;
container-type: size;
isolation: isolate;
background:
radial-gradient(
ellipse at 48% 42%,
color-mix(in srgb, var(--bg, #f6f1e7) 96%, var(--fg, #20242b)) 0%,
var(--bg, #f6f1e7) 72%
),
var(--bg, #f6f1e7);
color: var(--fg, #20242b);
font-family: var(--font-body, Inter, system-ui, sans-serif);
pointer-events: none;
}
.wbi-clip {
position: absolute;
inset: 0;
display: grid;
place-items: center;
overflow: hidden;
}
.wbi-stage {
display: grid;
grid-template-rows: minmax(0, 1fr) auto;
width: 92cqw;
height: 90cqh;
opacity: 0;
will-change: transform, opacity;
}
.wbi-board {
position: relative;
min-height: 0;
}
.wbi-svg {
display: block;
width: 100%;
height: 100%;
overflow: visible;
}
.wbi-sketch[hidden] {
display: none;
}
.wbi-stroke {
fill: none;
stroke: var(--fg, #20242b);
/* User-space width: never non-scaling-stroke on dashed paths
(screen-space dash breaks draw-on under group scale). Non-uniform
scale gives a natural thick-thin nib variation. */
stroke-width: 6;
stroke-linecap: round;
stroke-linejoin: round;
}
.wbi-stroke.wbi-accent {
stroke: var(--wbi-accent);
}
/* Custom strokes-slot paths inherit the same ink treatment without
needing any class; data-ink="accent" routes through the accent
token map exactly like a preset's highlight stroke. */
[data-slot="strokes"] path {
fill: none;
stroke: var(--fg, #20242b);
stroke-width: 6;
stroke-linecap: round;
stroke-linejoin: round;
}
[data-slot="strokes"] path[data-ink="accent"] {
stroke: var(--wbi-accent);
}
.wbi-pen {
filter: drop-shadow(0 5px 6px color-mix(in srgb, var(--fg, #20242b) 20%, transparent));
will-change: transform, opacity;
}
.wbi-pen-art {
will-change: transform;
}
.wbi-pen-body {
fill: var(--surface, #ffffff);
stroke: var(--fg, #20242b);
stroke-width: 4;
stroke-linecap: round;
stroke-linejoin: round;
}
.wbi-pen-nib {
fill: var(--wbi-accent);
stroke: var(--fg, #20242b);
stroke-width: 3;
}
.wbi-caption {
min-height: 10cqh;
padding-top: var(--space-1, 1.8cqh);
color: var(--muted, #667085);
font-family: var(--font-display, Inter, system-ui, sans-serif);
font-size: clamp(24px, 5cqh, 52px);
font-weight: 680;
line-height: 1.1;
letter-spacing: -0.02em;
text-align: center;
opacity: 0;
}
</style>
<div
id="wbi-clip"
class="wbi-clip clip"
data-start="0"
data-duration="5"
data-track-index="0"
>
<div class="wbi-stage" role="img">
<div class="wbi-board">
<svg
class="wbi-svg"
viewBox="0 0 1000 560"
preserveAspectRatio="xMidYMid meet"
aria-hidden="true"
>
<g
class="wbi-sketch"
data-sketch="bulb"
transform="translate(500 280) scale(1.25 1.4) translate(-500 -256)"
>
<path
class="wbi-stroke"
d="M 430 340 C 414 310 392 286 386 244 C 376 172 427 113 501 109 C 578 105 633 160 626 235 C 622 279 596 306 574 341"
></path>
<path
class="wbi-stroke wbi-accent"
d="M 454 238 C 469 251 482 263 499 292 C 517 261 532 247 549 235"
></path>
<path class="wbi-stroke" d="M 431 347 C 468 353 531 350 571 343"></path>
<path class="wbi-stroke" d="M 438 369 C 476 376 525 373 564 365"></path>
<path class="wbi-stroke" d="M 454 389 C 482 403 520 402 548 385"></path>
<path class="wbi-stroke" d="M 333 231 C 349 228 360 230 372 232"></path>
<path class="wbi-stroke" d="M 640 228 C 657 225 670 226 685 230"></path>
</g>
<g
class="wbi-sketch"
data-sketch="flow"
transform="translate(500 280) scale(0.9 2.1) translate(-525 -265)"
hidden
>
<path
class="wbi-stroke"
d="M 145 205 C 145 184 160 171 184 171 L 315 171 C 338 171 351 187 351 207 L 351 322 C 351 344 337 357 314 357 L 181 357 C 158 357 145 342 145 321 Z"
></path>
<path
class="wbi-stroke wbi-accent"
d="M 352 264 C 378 258 397 259 425 263 L 446 267 M 429 249 L 446 267 L 427 284"
></path>
<path class="wbi-stroke" d="M 516 170 L 611 265 L 516 360 L 421 265 Z"></path>
<path
class="wbi-stroke"
d="M 612 265 C 641 268 662 268 691 264 L 711 263 M 694 247 L 711 263 L 694 280"
></path>
<path
class="wbi-stroke"
d="M 711 204 C 711 184 726 171 749 171 L 868 171 C 891 171 905 187 905 208 L 905 321 C 905 343 891 357 868 357 L 748 357 C 725 357 711 342 711 321 Z"
></path>
<path
class="wbi-stroke"
d="M 764 266 C 785 284 802 292 820 294 C 837 278 849 256 861 230"
></path>
</g>
<g class="wbi-sketch" data-sketch="rocket" transform="translate(0 -17)" hidden>
<path
class="wbi-stroke"
d="M 500 76 C 552 117 581 184 578 272 C 576 329 549 378 500 420 C 451 378 425 329 422 272 C 419 184 448 117 500 76 Z"
></path>
<path
class="wbi-stroke wbi-accent"
d="M 500 181 C 526 181 544 198 544 223 C 544 248 527 265 500 265 C 475 265 457 248 457 223 C 457 199 474 181 500 181 Z"
></path>
<path
class="wbi-stroke"
d="M 430 295 C 386 320 359 363 353 419 C 389 405 420 384 448 353"
></path>
<path
class="wbi-stroke"
d="M 570 295 C 614 320 641 363 647 419 C 611 405 580 384 552 353"
></path>
<path
class="wbi-stroke"
d="M 476 415 C 464 445 470 478 500 518 C 530 478 536 445 524 415"
></path>
<path class="wbi-stroke" d="M 452 431 C 433 451 427 475 433 500"></path>
<path class="wbi-stroke" d="M 548 431 C 567 451 573 475 567 500"></path>
</g>
<!--
Strokes slot. Fill this group with your own <path> elements
(installed copy) to replace the preset sketches; paths draw
in document order in the 0 0 1000 560 viewBox space. Mark a
path data-ink="accent" for the accent token. Ships empty.
-->
<g class="wbi-sketch" data-slot="strokes" data-sketch="custom" hidden></g>
<g class="wbi-pen" aria-hidden="true">
<g class="wbi-pen-art">
<path class="wbi-pen-body" d="M 0 0 L -43 -11 L -52 0 L -43 11 Z"></path>
<path class="wbi-pen-nib" d="M 0 0 L -11 -7 L -11 7 Z"></path>
</g>
</g>
</svg>
</div>
<div class="wbi-caption"></div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<script>
(function () {
"use strict";
var root = document.getElementById("root");
var stage = root.querySelector(".wbi-stage");
var captionElement = root.querySelector(".wbi-caption");
var penElement = root.querySelector(".wbi-pen");
var penArt = root.querySelector(".wbi-pen-art");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var sketchGroups = {
bulb: root.querySelector('[data-sketch="bulb"]'),
flow: root.querySelector('[data-sketch="flow"]'),
rocket: root.querySelector('[data-sketch="rocket"]'),
};
var sketch = Object.prototype.hasOwnProperty.call(sketchGroups, vars.sketch)
? vars.sketch
: "bulb";
var caption = vars.caption == null ? "Draw the idea" : String(vars.caption);
var penVisible = vars.pen !== "hide";
var accentColors = {
green: "var(--brand, #71f5a7)",
blue: "var(--accent, #61a8ff)",
violet: "var(--accent-2, #c5a3ff)",
};
var accent = Object.prototype.hasOwnProperty.call(accentColors, vars.accent)
? vars.accent
: "green";
var exitModes = { none: true, fade: true, up: true };
var exitMode = Object.prototype.hasOwnProperty.call(exitModes, vars.exit)
? vars.exit
: "none";
// Strokes slot: user-supplied paths replace the preset sketches.
var strokesSlot = root.querySelector('[data-slot="strokes"]');
var slotPaths = strokesSlot ? strokesSlot.querySelectorAll("path") : [];
var hasCustomStrokes = slotPaths.length > 0;
if (hasCustomStrokes) {
Array.prototype.forEach.call(slotPaths, function (path) {
// CSS beats SVG presentation attributes; promote an authored
// stroke-width to inline style so it wins over the slot rule.
var strokeWidth = path.getAttribute("stroke-width");
if (strokeWidth) path.style.strokeWidth = strokeWidth;
});
}
Object.keys(sketchGroups).forEach(function (name) {
// SVG <g> has no `hidden` IDL property (assignment is a dead
// expando); toggle the attribute so the [hidden] CSS applies.
if (hasCustomStrokes || name !== sketch)
sketchGroups[name].setAttribute("hidden", "");
else sketchGroups[name].removeAttribute("hidden");
});
if (hasCustomStrokes) strokesSlot.removeAttribute("hidden");
var activeGroup = hasCustomStrokes ? strokesSlot : sketchGroups[sketch];
root.style.setProperty("--wbi-accent", accentColors[accent]);
captionElement.textContent = caption;
penElement.style.display = penVisible ? "" : "none";
stage.setAttribute(
"aria-label",
(hasCustomStrokes
? "Custom sketch. "
: sketch.charAt(0).toUpperCase() + sketch.slice(1) + " sketch. ") + caption,
);
var groupTransform = activeGroup.transform.baseVal.consolidate();
var strokes = Array.from(activeGroup.querySelectorAll("path")).map(function (path) {
var length = path.getTotalLength();
path.style.strokeDasharray = length + " " + length;
path.style.strokeDashoffset = String(length);
return {
path: path,
length: length,
progress: 0,
matrix: groupTransform ? groupTransform.matrix : null,
};
});
var totalLength = strokes.reduce(function (sum, stroke) {
return sum + stroke.length;
}, 0);
function pointAt(stroke, distance) {
var point = stroke.path.getPointAtLength(distance);
return stroke.matrix ? point.matrixTransform(stroke.matrix) : point;
}
function pathPose(stroke, progress) {
var distance = progress * stroke.length;
var tangentStep = Math.max(0.5, stroke.length * 0.004);
var before = pointAt(stroke, Math.max(0, distance - tangentStep));
var after = pointAt(stroke, Math.min(stroke.length, distance + tangentStep));
var point = pointAt(stroke, distance);
return {
x: point.x,
y: point.y,
rotation: (Math.atan2(after.y - before.y, after.x - before.x) * 180) / Math.PI,
};
}
function placePen(pose) {
gsap.set(penElement, { x: pose.x, y: pose.y, rotation: pose.rotation });
}
function renderStroke(stroke) {
var clamped = Math.max(0, Math.min(1, stroke.progress));
stroke.path.style.strokeDashoffset = String((1 - clamped) * stroke.length);
placePen(pathPose(stroke, clamped));
}
var DRAW_PHASE_BASE = 3.25;
var CAPTION_BASE = 0.3;
var IN_BASE = DRAW_PHASE_BASE + CAPTION_BASE;
var OUT_BASE = exitMode === "none" ? 0 : 0.45;
var resolvedDuration =
window.__hyperframes && window.__hyperframes.getDuration
? window.__hyperframes.getDuration()
: undefined;
var duration = Math.max(
0.001,
typeof resolvedDuration === "number"
? resolvedDuration
: parseFloat(root.dataset.duration || "5"),
);
var fixedTotal = IN_BASE + OUT_BASE;
var phaseScale = duration < fixedTotal ? duration / fixedTotal : 1;
var IN = IN_BASE * phaseScale;
var OUT = OUT_BASE * phaseScale;
var HOLD = Math.max(0, duration - IN - OUT);
var DRAW_PHASE = DRAW_PHASE_BASE * phaseScale;
var CAPTION = CAPTION_BASE * phaseScale;
var hopCount = strokes.length - 1;
var HOP = 0.1 * phaseScale;
var MIN_DRAW = 0.26 * phaseScale;
// Custom slots can hold many strokes; when the fixed per-stroke
// floors alone would overrun the draw phase, shrink them together
// so the cadence stays sequential and the phase never overflows.
var fixedNeed = MIN_DRAW * strokes.length + HOP * hopCount;
if (fixedNeed > DRAW_PHASE) {
var crowd = DRAW_PHASE / fixedNeed;
HOP *= crowd;
MIN_DRAW *= crowd;
}
var DRAW_BUDGET = DRAW_PHASE - HOP * hopCount;
var LENGTH_BUDGET = Math.max(0, DRAW_BUDGET - MIN_DRAW * strokes.length);
var OUT_START = IN + HOLD;
var cursor = 0;
gsap.set(stage, { opacity: 0, y: "1.2cqh" });
gsap.set(captionElement, { opacity: 0, y: "1.4cqh" });
gsap.set(penElement, { opacity: penVisible ? 1 : 0 });
gsap.set(penArt, { y: 0, transformOrigin: "0px 0px" });
placePen(pathPose(strokes[0], 0));
var tl = gsap.timeline({ paused: true });
// IN: each stroke owns one progress value. Its single onUpdate
// paints the dash and places the nib at the same ink front.
tl.to(
stage,
{ opacity: 1, y: "0cqh", duration: Math.min(0.26, IN), ease: "power2.out" },
0,
);
strokes.forEach(function (stroke, index) {
var drawDuration = MIN_DRAW + (LENGTH_BUDGET * stroke.length) / totalLength;
tl.to(
stroke,
{
progress: 1,
duration: drawDuration,
ease: "power1.inOut",
onUpdate: function () {
renderStroke(stroke);
},
},
cursor,
);
cursor += drawDuration;
if (index < strokes.length - 1) {
var nextStroke = strokes[index + 1];
var fromPose = pathPose(stroke, 1);
var toPose = pathPose(nextStroke, 0);
var hopState = { progress: 0 };
tl.to(
hopState,
{
progress: 1,
duration: HOP,
ease: "power2.out",
onUpdate: function () {
var progress = hopState.progress;
placePen({
x: fromPose.x + (toPose.x - fromPose.x) * progress,
y:
fromPose.y +
(toPose.y - fromPose.y) * progress -
Math.sin(Math.PI * progress) * 18,
rotation:
fromPose.rotation + (toPose.rotation - fromPose.rotation) * progress,
});
gsap.set(penArt, { y: -Math.sin(Math.PI * progress) * 8 });
},
},
cursor,
);
cursor += HOP;
}
});
tl.to(
captionElement,
{ opacity: 1, y: "0cqh", duration: CAPTION, ease: "power2.out" },
cursor,
);
tl.to(penElement, { opacity: 0, duration: CAPTION, ease: "power2.out" }, cursor);
tl.to(penArt, { y: -18, duration: CAPTION, ease: "power2.out" }, cursor);
// HOLD: the completed lockup stays dead calm. Duration changes
// stretch only this gap between the caption reveal and OUT.
// OUT: only when an exit is requested; exit none holds the final
// frame to the end (frame roots own transitions).
if (exitMode !== "none") {
var exitTween = { opacity: 0, duration: OUT, ease: "power2.in" };
if (exitMode === "up") exitTween.y = "-1.8cqh";
tl.to(stage, exitTween, OUT_START);
}
tl.seek(0);
window.__timelines = window.__timelines || {};
window.__timelines["whiteboard-ink"] = tl;
})();
</script>
</div>
</template>
</body>
</html>
```
</VariablesExplorer>
## Install
<InstallCommand command="npx hyperframes add whiteboard-ink" item="whiteboard-ink" />
That writes one file: `compositions/components/whiteboard-ink.html`.
## Paste it into your composition
Open `compositions/components/whiteboard-ink.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.
## Variables
Every one of these has a default, so the piece works untouched. Set the ones you
want to change on the element:
| Variable | Default | Accepts | What it does |
| --- | --- | --- | --- |
| `sketch` | `bulb` | `bulb`, `flow`, `rocket` | Authored preset sketch to draw. Ignored when the strokes slot holds custom paths. |
| `caption` | `Draw the idea` | string | Short line shown after the sketch completes. |
| `pen` | `show` | `show`, `hide` | Show or hide the pen nib actor. |
| `accent` | `green` | `green`, `blue`, `violet` | Color used by strokes marked data-ink=accent (one highlight stroke in each preset). |
| `exit` | `none` | `none`, `fade`, `up` | How the completed lockup leaves. none holds the final frame. |
Set them with `data-variable-values` on the element that mounts it. These are the
defaults, so this behaves exactly like the preview above until you change one:
```html wrap
<div
data-composition-id="whiteboard-ink"
data-composition-src="compositions/components/whiteboard-ink.html"
data-variable-values='{"sketch":"bulb","caption":"Draw the idea","pen":"show","accent":"green","exit":"none"}'
></div>
```
## Source
<Accordion title={`whiteboard-ink.html`}>
```html
<!doctype html>
<!--
whiteboard-ink: HyperFrames video primitive (intros and reveals / ink draw)
A hand-authored SVG sketch draws one stroke at a time while a pen nib
samples the active path tip. The nib follows getPointAtLength during each
draw and takes a short lifted hop between strokes.
Strokes slot: the SVG ships an empty <g data-slot="strokes"> group. Fill it
with your own <path> elements (in your installed copy) and those paths
become the drawing; the sketch enum is ignored while the slot has paths.
Mark one path data-ink="accent" to route it through the accent token map.
Nib riding, per-stroke cadence, and the ink law are identical for slot
strokes and presets.
Variables:
- sketch (bulb / flow / rocket): authored preset sketch; ignored when the
strokes slot holds paths.
- caption (string): short line shown after the drawing completes.
- pen (show / hide): visibility of the traveling nib actor.
- accent (green / blue / violet): one highlight stroke routed through a
distinct contract token.
- exit (none / fade / up): how the completed lockup leaves. none holds
the final frame (frame roots own transitions); fade releases opacity
only; up adds the small upward drift.
Envelope, fixed IN and OUT with elastic HOLD only:
IN_BASE = 3.55s, 3.25s sequential draw phase, then pen exit and caption
HOLD = max(0, D - IN - OUT), dead-calm completed lockup
OUT_BASE = 0.45s when exit is fade or up, otherwise 0 (hold to the end)
If D is shorter than IN_BASE + OUT_BASE, IN and OUT compress together.
The timeline is never time-scaled.
Ink law: every selected path is measured once with getTotalLength. That
measurement owns its dash array, dash offset, cadence weight, and nib
sampling. Dashed geometry stays in native SVG user units.
Mount contract: the runtime clones only this template. #root fills the host
box, establishes the container query basis, has no data-width or data-height,
and registers one paused timeline under the literal whiteboard-ink key.
-->
<html
lang="en"
data-composition-id="whiteboard-ink"
data-composition-duration="5"
data-composition-variables='[
{ "id": "sketch", "type": "enum", "role": "content", "label": "Sketch", "description": "Authored preset sketch to draw. Ignored when the strokes slot holds custom paths.", "default": "bulb", "options": [{ "value": "bulb", "label": "Bulb" }, { "value": "flow", "label": "Flow" }, { "value": "rocket", "label": "Rocket" }] },
{ "id": "caption", "type": "string", "role": "content", "label": "Caption", "description": "Short line shown after the sketch completes.", "default": "Draw the idea" },
{ "id": "pen", "type": "enum", "role": "style", "label": "Pen", "description": "Show or hide the pen nib actor.", "default": "show", "options": [{ "value": "show", "label": "Show" }, { "value": "hide", "label": "Hide" }] },
{ "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Color used by strokes marked data-ink=accent (one highlight stroke in each preset).", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
{ "id": "exit", "type": "enum", "role": "style", "label": "Exit", "description": "How the completed lockup leaves. none holds the final frame.", "default": "none", "options": [{ "value": "none", "label": "None" }, { "value": "fade", "label": "Fade" }, { "value": "up", "label": "Up" }] }
]'
>
<head>
<meta charset="UTF-8" />
<title>Whiteboard Ink</title>
</head>
<body>
<template>
<div id="root" data-composition-id="whiteboard-ink" data-duration="5" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
#root {
position: absolute;
inset: 0;
overflow: hidden;
container-type: size;
isolation: isolate;
background:
radial-gradient(
ellipse at 48% 42%,
color-mix(in srgb, var(--bg, #f6f1e7) 96%, var(--fg, #20242b)) 0%,
var(--bg, #f6f1e7) 72%
),
var(--bg, #f6f1e7);
color: var(--fg, #20242b);
font-family: var(--font-body, Inter, system-ui, sans-serif);
pointer-events: none;
}
.wbi-clip {
position: absolute;
inset: 0;
display: grid;
place-items: center;
overflow: hidden;
}
.wbi-stage {
display: grid;
grid-template-rows: minmax(0, 1fr) auto;
width: 92cqw;
height: 90cqh;
opacity: 0;
will-change: transform, opacity;
}
.wbi-board {
position: relative;
min-height: 0;
}
.wbi-svg {
display: block;
width: 100%;
height: 100%;
overflow: visible;
}
.wbi-sketch[hidden] {
display: none;
}
.wbi-stroke {
fill: none;
stroke: var(--fg, #20242b);
/* User-space width: never non-scaling-stroke on dashed paths
(screen-space dash breaks draw-on under group scale). Non-uniform
scale gives a natural thick-thin nib variation. */
stroke-width: 6;
stroke-linecap: round;
stroke-linejoin: round;
}
.wbi-stroke.wbi-accent {
stroke: var(--wbi-accent);
}
/* Custom strokes-slot paths inherit the same ink treatment without
needing any class; data-ink="accent" routes through the accent
token map exactly like a preset's highlight stroke. */
[data-slot="strokes"] path {
fill: none;
stroke: var(--fg, #20242b);
stroke-width: 6;
stroke-linecap: round;
stroke-linejoin: round;
}
[data-slot="strokes"] path[data-ink="accent"] {
stroke: var(--wbi-accent);
}
.wbi-pen {
filter: drop-shadow(0 5px 6px color-mix(in srgb, var(--fg, #20242b) 20%, transparent));
will-change: transform, opacity;
}
.wbi-pen-art {
will-change: transform;
}
.wbi-pen-body {
fill: var(--surface, #ffffff);
stroke: var(--fg, #20242b);
stroke-width: 4;
stroke-linecap: round;
stroke-linejoin: round;
}
.wbi-pen-nib {
fill: var(--wbi-accent);
stroke: var(--fg, #20242b);
stroke-width: 3;
}
.wbi-caption {
min-height: 10cqh;
padding-top: var(--space-1, 1.8cqh);
color: var(--muted, #667085);
font-family: var(--font-display, Inter, system-ui, sans-serif);
font-size: clamp(24px, 5cqh, 52px);
font-weight: 680;
line-height: 1.1;
letter-spacing: -0.02em;
text-align: center;
opacity: 0;
}
</style>
<div
id="wbi-clip"
class="wbi-clip clip"
data-start="0"
data-duration="5"
data-track-index="0"
>
<div class="wbi-stage" role="img">
<div class="wbi-board">
<svg
class="wbi-svg"
viewBox="0 0 1000 560"
preserveAspectRatio="xMidYMid meet"
aria-hidden="true"
>
<g
class="wbi-sketch"
data-sketch="bulb"
transform="translate(500 280) scale(1.25 1.4) translate(-500 -256)"
>
<path
class="wbi-stroke"
d="M 430 340 C 414 310 392 286 386 244 C 376 172 427 113 501 109 C 578 105 633 160 626 235 C 622 279 596 306 574 341"
></path>
<path
class="wbi-stroke wbi-accent"
d="M 454 238 C 469 251 482 263 499 292 C 517 261 532 247 549 235"
></path>
<path class="wbi-stroke" d="M 431 347 C 468 353 531 350 571 343"></path>
<path class="wbi-stroke" d="M 438 369 C 476 376 525 373 564 365"></path>
<path class="wbi-stroke" d="M 454 389 C 482 403 520 402 548 385"></path>
<path class="wbi-stroke" d="M 333 231 C 349 228 360 230 372 232"></path>
<path class="wbi-stroke" d="M 640 228 C 657 225 670 226 685 230"></path>
</g>
<g
class="wbi-sketch"
data-sketch="flow"
transform="translate(500 280) scale(0.9 2.1) translate(-525 -265)"
hidden
>
<path
class="wbi-stroke"
d="M 145 205 C 145 184 160 171 184 171 L 315 171 C 338 171 351 187 351 207 L 351 322 C 351 344 337 357 314 357 L 181 357 C 158 357 145 342 145 321 Z"
></path>
<path
class="wbi-stroke wbi-accent"
d="M 352 264 C 378 258 397 259 425 263 L 446 267 M 429 249 L 446 267 L 427 284"
></path>
<path class="wbi-stroke" d="M 516 170 L 611 265 L 516 360 L 421 265 Z"></path>
<path
class="wbi-stroke"
d="M 612 265 C 641 268 662 268 691 264 L 711 263 M 694 247 L 711 263 L 694 280"
></path>
<path
class="wbi-stroke"
d="M 711 204 C 711 184 726 171 749 171 L 868 171 C 891 171 905 187 905 208 L 905 321 C 905 343 891 357 868 357 L 748 357 C 725 357 711 342 711 321 Z"
></path>
<path
class="wbi-stroke"
d="M 764 266 C 785 284 802 292 820 294 C 837 278 849 256 861 230"
></path>
</g>
<g class="wbi-sketch" data-sketch="rocket" transform="translate(0 -17)" hidden>
<path
class="wbi-stroke"
d="M 500 76 C 552 117 581 184 578 272 C 576 329 549 378 500 420 C 451 378 425 329 422 272 C 419 184 448 117 500 76 Z"
></path>
<path
class="wbi-stroke wbi-accent"
d="M 500 181 C 526 181 544 198 544 223 C 544 248 527 265 500 265 C 475 265 457 248 457 223 C 457 199 474 181 500 181 Z"
></path>
<path
class="wbi-stroke"
d="M 430 295 C 386 320 359 363 353 419 C 389 405 420 384 448 353"
></path>
<path
class="wbi-stroke"
d="M 570 295 C 614 320 641 363 647 419 C 611 405 580 384 552 353"
></path>
<path
class="wbi-stroke"
d="M 476 415 C 464 445 470 478 500 518 C 530 478 536 445 524 415"
></path>
<path class="wbi-stroke" d="M 452 431 C 433 451 427 475 433 500"></path>
<path class="wbi-stroke" d="M 548 431 C 567 451 573 475 567 500"></path>
</g>
<!--
Strokes slot. Fill this group with your own <path> elements
(installed copy) to replace the preset sketches; paths draw
in document order in the 0 0 1000 560 viewBox space. Mark a
path data-ink="accent" for the accent token. Ships empty.
-->
<g class="wbi-sketch" data-slot="strokes" data-sketch="custom" hidden></g>
<g class="wbi-pen" aria-hidden="true">
<g class="wbi-pen-art">
<path class="wbi-pen-body" d="M 0 0 L -43 -11 L -52 0 L -43 11 Z"></path>
<path class="wbi-pen-nib" d="M 0 0 L -11 -7 L -11 7 Z"></path>
</g>
</g>
</svg>
</div>
<div class="wbi-caption"></div>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<script>
(function () {
"use strict";
var root = document.getElementById("root");
var stage = root.querySelector(".wbi-stage");
var captionElement = root.querySelector(".wbi-caption");
var penElement = root.querySelector(".wbi-pen");
var penArt = root.querySelector(".wbi-pen-art");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var sketchGroups = {
bulb: root.querySelector('[data-sketch="bulb"]'),
flow: root.querySelector('[data-sketch="flow"]'),
rocket: root.querySelector('[data-sketch="rocket"]'),
};
var sketch = Object.prototype.hasOwnProperty.call(sketchGroups, vars.sketch)
? vars.sketch
: "bulb";
var caption = vars.caption == null ? "Draw the idea" : String(vars.caption);
var penVisible = vars.pen !== "hide";
var accentColors = {
green: "var(--brand, #71f5a7)",
blue: "var(--accent, #61a8ff)",
violet: "var(--accent-2, #c5a3ff)",
};
var accent = Object.prototype.hasOwnProperty.call(accentColors, vars.accent)
? vars.accent
: "green";
var exitModes = { none: true, fade: true, up: true };
var exitMode = Object.prototype.hasOwnProperty.call(exitModes, vars.exit)
? vars.exit
: "none";
// Strokes slot: user-supplied paths replace the preset sketches.
var strokesSlot = root.querySelector('[data-slot="strokes"]');
var slotPaths = strokesSlot ? strokesSlot.querySelectorAll("path") : [];
var hasCustomStrokes = slotPaths.length > 0;
if (hasCustomStrokes) {
Array.prototype.forEach.call(slotPaths, function (path) {
// CSS beats SVG presentation attributes; promote an authored
// stroke-width to inline style so it wins over the slot rule.
var strokeWidth = path.getAttribute("stroke-width");
if (strokeWidth) path.style.strokeWidth = strokeWidth;
});
}
Object.keys(sketchGroups).forEach(function (name) {
// SVG <g> has no `hidden` IDL property (assignment is a dead
// expando); toggle the attribute so the [hidden] CSS applies.
if (hasCustomStrokes || name !== sketch)
sketchGroups[name].setAttribute("hidden", "");
else sketchGroups[name].removeAttribute("hidden");
});
if (hasCustomStrokes) strokesSlot.removeAttribute("hidden");
var activeGroup = hasCustomStrokes ? strokesSlot : sketchGroups[sketch];
root.style.setProperty("--wbi-accent", accentColors[accent]);
captionElement.textContent = caption;
penElement.style.display = penVisible ? "" : "none";
stage.setAttribute(
"aria-label",
(hasCustomStrokes
? "Custom sketch. "
: sketch.charAt(0).toUpperCase() + sketch.slice(1) + " sketch. ") + caption,
);
var groupTransform = activeGroup.transform.baseVal.consolidate();
var strokes = Array.from(activeGroup.querySelectorAll("path")).map(function (path) {
var length = path.getTotalLength();
path.style.strokeDasharray = length + " " + length;
path.style.strokeDashoffset = String(length);
return {
path: path,
length: length,
progress: 0,
matrix: groupTransform ? groupTransform.matrix : null,
};
});
var totalLength = strokes.reduce(function (sum, stroke) {
return sum + stroke.length;
}, 0);
function pointAt(stroke, distance) {
var point = stroke.path.getPointAtLength(distance);
return stroke.matrix ? point.matrixTransform(stroke.matrix) : point;
}
function pathPose(stroke, progress) {
var distance = progress * stroke.length;
var tangentStep = Math.max(0.5, stroke.length * 0.004);
var before = pointAt(stroke, Math.max(0, distance - tangentStep));
var after = pointAt(stroke, Math.min(stroke.length, distance + tangentStep));
var point = pointAt(stroke, distance);
return {
x: point.x,
y: point.y,
rotation: (Math.atan2(after.y - before.y, after.x - before.x) * 180) / Math.PI,
};
}
function placePen(pose) {
gsap.set(penElement, { x: pose.x, y: pose.y, rotation: pose.rotation });
}
function renderStroke(stroke) {
var clamped = Math.max(0, Math.min(1, stroke.progress));
stroke.path.style.strokeDashoffset = String((1 - clamped) * stroke.length);
placePen(pathPose(stroke, clamped));
}
var DRAW_PHASE_BASE = 3.25;
var CAPTION_BASE = 0.3;
var IN_BASE = DRAW_PHASE_BASE + CAPTION_BASE;
var OUT_BASE = exitMode === "none" ? 0 : 0.45;
var resolvedDuration =
window.__hyperframes && window.__hyperframes.getDuration
? window.__hyperframes.getDuration()
: undefined;
var duration = Math.max(
0.001,
typeof resolvedDuration === "number"
? resolvedDuration
: parseFloat(root.dataset.duration || "5"),
);
var fixedTotal = IN_BASE + OUT_BASE;
var phaseScale = duration < fixedTotal ? duration / fixedTotal : 1;
var IN = IN_BASE * phaseScale;
var OUT = OUT_BASE * phaseScale;
var HOLD = Math.max(0, duration - IN - OUT);
var DRAW_PHASE = DRAW_PHASE_BASE * phaseScale;
var CAPTION = CAPTION_BASE * phaseScale;
var hopCount = strokes.length - 1;
var HOP = 0.1 * phaseScale;
var MIN_DRAW = 0.26 * phaseScale;
// Custom slots can hold many strokes; when the fixed per-stroke
// floors alone would overrun the draw phase, shrink them together
// so the cadence stays sequential and the phase never overflows.
var fixedNeed = MIN_DRAW * strokes.length + HOP * hopCount;
if (fixedNeed > DRAW_PHASE) {
var crowd = DRAW_PHASE / fixedNeed;
HOP *= crowd;
MIN_DRAW *= crowd;
}
var DRAW_BUDGET = DRAW_PHASE - HOP * hopCount;
var LENGTH_BUDGET = Math.max(0, DRAW_BUDGET - MIN_DRAW * strokes.length);
var OUT_START = IN + HOLD;
var cursor = 0;
gsap.set(stage, { opacity: 0, y: "1.2cqh" });
gsap.set(captionElement, { opacity: 0, y: "1.4cqh" });
gsap.set(penElement, { opacity: penVisible ? 1 : 0 });
gsap.set(penArt, { y: 0, transformOrigin: "0px 0px" });
placePen(pathPose(strokes[0], 0));
var tl = gsap.timeline({ paused: true });
// IN: each stroke owns one progress value. Its single onUpdate
// paints the dash and places the nib at the same ink front.
tl.to(
stage,
{ opacity: 1, y: "0cqh", duration: Math.min(0.26, IN), ease: "power2.out" },
0,
);
strokes.forEach(function (stroke, index) {
var drawDuration = MIN_DRAW + (LENGTH_BUDGET * stroke.length) / totalLength;
tl.to(
stroke,
{
progress: 1,
duration: drawDuration,
ease: "power1.inOut",
onUpdate: function () {
renderStroke(stroke);
},
},
cursor,
);
cursor += drawDuration;
if (index < strokes.length - 1) {
var nextStroke = strokes[index + 1];
var fromPose = pathPose(stroke, 1);
var toPose = pathPose(nextStroke, 0);
var hopState = { progress: 0 };
tl.to(
hopState,
{
progress: 1,
duration: HOP,
ease: "power2.out",
onUpdate: function () {
var progress = hopState.progress;
placePen({
x: fromPose.x + (toPose.x - fromPose.x) * progress,
y:
fromPose.y +
(toPose.y - fromPose.y) * progress -
Math.sin(Math.PI * progress) * 18,
rotation:
fromPose.rotation + (toPose.rotation - fromPose.rotation) * progress,
});
gsap.set(penArt, { y: -Math.sin(Math.PI * progress) * 8 });
},
},
cursor,
);
cursor += HOP;
}
});
tl.to(
captionElement,
{ opacity: 1, y: "0cqh", duration: CAPTION, ease: "power2.out" },
cursor,
);
tl.to(penElement, { opacity: 0, duration: CAPTION, ease: "power2.out" }, cursor);
tl.to(penArt, { y: -18, duration: CAPTION, ease: "power2.out" }, cursor);
// HOLD: the completed lockup stays dead calm. Duration changes
// stretch only this gap between the caption reveal and OUT.
// OUT: only when an exit is requested; exit none holds the final
// frame to the end (frame roots own transitions).
if (exitMode !== "none") {
var exitTween = { opacity: 0, duration: OUT, ease: "power2.in" };
if (exitMode === "up") exitTween.y = "-1.8cqh";
tl.to(stage, exitTween, OUT_START);
}
tl.seek(0);
window.__timelines = window.__timelines || {};
window.__timelines["whiteboard-ink"] = tl;
})();
</script>
</div>
</template>
</body>
</html>
```
</Accordion>
{/* hf:generated-footer */}
Tagged `motion-primitive` `intro` `reveal` `svg` `whiteboard` `line-draw` `slot`.
## Related topics
- [Browse the complete Catalog](/catalog)
- [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
- [Build a richer composition](/go-further)
Reference in New Issue View Git Blame Copy Permalink