ext/hyperframes
2
0
Fork 0
mirror of https://github.com/heygen-com/hyperframes.git synced 2026-09-01 19:42:03 +00:00
Code Issues Packages Projects Releases Wiki Activity
Files
sync/hyperframes-codegen-b514a3b6
hyperframes/docs/catalog/components/beat-timeline.mdx
T
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

650 lines
27 KiB
Plaintext
Raw Permalink Blame History

---
title: "Beat Timeline"
description: "A paused master-timeline orchestration spine that pins titled beat rows to evenly spaced named labels. Each row enters on its label, holds with the sequence, then exits with the group."
---
import { InstallCommand } from "/snippets/install-command.jsx";
import { VariablesExplorer } from "/snippets/variables-explorer.jsx";
<VariablesExplorer
previewSrc="/public/catalog/components/beat-timeline.json"
compositionId="beat-timeline"
compositionSrc="compositions/components/beat-timeline.html"
variables={[{"id":"beatCount","type":"number","role":"content","label":"Beat count","description":"Number of beat rows in the sequence.","default":4,"min":2,"max":6,"step":1},{"id":"interval","type":"number","role":"layout","label":"Interval","description":"Base time between consecutive beat markers.","default":0.6,"min":0.2,"max":2,"step":0.05,"unit":"s"},{"id":"labels","type":"string","role":"content","label":"Labels","description":"Comma-separated beat titles, one per beat. Extra entries are ignored and missing entries fall back to Beat N.","default":"One,Two,Three,Four"}]}
>
```html beat-timeline.html
<!doctype html>
<!--
beat-timeline -- HyperFrames video primitive (transitions / sequencing / bridge)
Concept: a visible orchestration spine made from a paused master GSAP
timeline. Each beat row is pinned to an evenly spaced named label, then
enters exactly on that mark. One mechanic, one job: bridge a sequence by
making its deterministic beat grid readable and copy-and-own-able.
Compiled-from evidence: launches-motion-vocabulary.md, "Paused, seeked
timeline orchestration" census entry (15/18 projects, 134/159 files).
Use when: a scene needs several titled beats to land in a clear order, or
when a copied composition needs a legible master-timeline sequencing spine.
Variables (declared in data-composition-variables below):
- beatCount (number, default 4): integer row count, clamped to 2..6.
- interval (number, default 0.6s): base spacing between named beat labels,
clamped to 0.2..2s before any short-duration compression.
- labels (string): comma-separated row titles. Missing entries fall back
to "Beat N" and extra entries are ignored.
Envelope (holdable orchestration adaptation, never gsap.timeScale()):
ENTRANCE_SPAN = (beatCount - 1) * interval + ROW_IN_DURATION.
HOLD = max(0, D - (ENTRANCE_SPAN + OUT_BASE)); every landed row remains
fully visible and deliberately still during this elastic phase.
OUT_BASE = 0.40s; all rows fade together with power2.in at D - OUT_BASE.
If D is shorter than ENTRANCE_SPAN + OUT_BASE, interval and each row's
entrance duration scale down together so the final row still lands before
OUT. Only a host duration at or below OUT_BASE also compresses OUT, which
keeps the full lifecycle inside an otherwise impossible time box.
Sync points: beat labels are fixed offsets inside IN. Every label owns one
declared SFX cue at the same offset, never inside elastic HOLD. Beats use
"beat-tick" and the last beat uses "beat-tick-final". The primitive only
dispatches bubbling hf:sfx events; scene-level audio mixing owns playback.
Mount contract: this file is a mountable sub-composition. The runtime clones
only <template> contents, so all live styles, markup, and scripts are inside
the template. #root fills the host-owned box with no data-width/data-height,
and all internal geometry is based on its own cqw/cqh container. Variables
come from window.__hyperframes.getVariables(), because document.documentElement
belongs to the host after mounting.
-->
<html
lang="en"
data-composition-variables='[
{ "id": "beatCount", "type": "number", "role": "content", "label": "Beat count", "description": "Number of beat rows in the sequence.", "default": 4, "min": 2, "max": 6, "step": 1 },
{ "id": "interval", "type": "number", "role": "layout", "label": "Interval", "description": "Base time between consecutive beat markers.", "default": 0.6, "min": 0.2, "max": 2, "step": 0.05, "unit": "s" },
{ "id": "labels", "type": "string", "role": "content", "label": "Labels", "description": "Comma-separated beat titles, one per beat. Extra entries are ignored and missing entries fall back to Beat N.", "default": "One,Two,Three,Four" }
]'
>
<head>
<meta charset="UTF-8" />
<title>Beat Timeline</title>
<!-- Metadata only. The loader reads variable declarations from <html>,
then discards everything outside <template> during mounting. -->
</head>
<body>
<template>
<div
id="root"
data-composition-id="beat-timeline"
data-start="0"
data-duration="5.5"
data-fps="30"
>
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
/* Root is styled by ID for mounted CSS scoping. It owns no stage
dimensions, only the host box and the container-unit basis. */
#root {
--ease-standard: cubic-bezier(0.215, 0.61, 0.355, 1);
--ease-exit: cubic-bezier(0.55, 0.055, 0.675, 0.19);
position: absolute;
inset: 0;
container-type: size;
isolation: isolate;
overflow: hidden;
background: var(--bg, Canvas);
color: var(--fg, CanvasText);
font-family: var(--font-body, system-ui, sans-serif);
}
.bt-clip {
width: 100%;
height: 100%;
display: grid;
place-items: center;
}
.bt-stack {
width: 84cqw;
display: flex;
flex-direction: column;
gap: 1.4cqh;
}
/* EDIT ZONE: row geometry only. Motion timing is owned by the script's
RETIME RANGE below, and theme paint remains token-driven here. */
.bt-row {
min-height: 10cqh;
display: grid;
grid-template-columns: 6cqw 1fr;
align-items: center;
column-gap: 2.6cqw;
padding: 1.4cqh 2.4cqw;
border: 0.12cqw solid var(--border, currentColor);
border-radius: var(--radius, 2cqh);
background: var(--surface, Canvas);
box-shadow: 0 1.2cqh 4cqh color-mix(in srgb, var(--bg, Canvas) 52%, transparent);
}
.bt-index {
width: 6cqw;
height: 6cqw;
display: grid;
place-items: center;
border-radius: 50%;
background: var(--brand, currentColor);
color: var(--bg, Canvas);
font-family: var(--font-display, system-ui, sans-serif);
font-size: 1.8cqw;
font-weight: 750;
line-height: 1;
}
.bt-copy {
min-width: 0;
}
.bt-title {
overflow: hidden;
color: var(--fg, CanvasText);
font-family: var(--font-display, system-ui, sans-serif);
font-size: min(4.4cqw, 5.2cqh);
font-weight: 700;
line-height: 1.04;
letter-spacing: -0.08cqw;
text-overflow: ellipsis;
white-space: nowrap;
}
.bt-subtitle {
margin-top: 0.7cqh;
color: var(--muted, currentColor);
font-size: min(1.8cqw, 2.2cqh);
font-weight: 550;
line-height: 1.15;
letter-spacing: 0.04cqw;
}
</style>
<div
id="beat-timeline-clip"
class="bt-clip clip"
data-start="0"
data-duration="5.5"
data-track-index="0"
>
<div class="bt-stack" aria-label="Beat timeline"></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");
// Literal by contract: mounting strips data-composition-id from the
// flattened inner root, so reading the attribute post-mount would
// register under null and fail the timeline lookup.
var compositionId = "beat-timeline";
var stack = root.querySelector(".bt-stack");
// EDIT ZONE: declarations live on <html>; this runtime call is the
// single owner of declared defaults plus per-instance overrides.
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var parsedBeatCount = Number(vars.beatCount);
// INVARIANT: exactly 2..6 integer rows reach the DOM and timeline.
var beatCount = Math.max(
2,
Math.min(6, Math.round(Number.isFinite(parsedBeatCount) ? parsedBeatCount : 4)),
);
var parsedInterval = Number(vars.interval);
// INVARIANT: invalid timing falls back once, valid timing clamps to
// the declared range before duration elasticity is calculated.
var interval = Math.max(
0.2,
Math.min(2, Number.isFinite(parsedInterval) ? parsedInterval : 0.6),
);
// INVARIANT: labels is always a string; blank or missing entries
// fall back per row, while authored extra entries stay unused.
var labelsValue = vars.labels == null ? "One,Two,Three,Four" : String(vars.labels);
var suppliedLabels = labelsValue.split(",").map(function (label) {
return label.trim();
});
var parsedDuration = parseFloat(root.dataset.duration || "5.5");
// INVARIANT: the lifecycle remains finite even under a malformed
// host duration. The authored and demo durations are both 5.5s.
var duration = Math.max(0.001, Number.isFinite(parsedDuration) ? parsedDuration : 5.5);
// RETIME RANGE: these values own the whole pacing decision. The
// interval and row entrance compress together, never via timeScale.
var ROW_IN_BASE = 0.4;
var OUT_BASE = 0.4;
var baseEntranceSpan = (beatCount - 1) * interval + ROW_IN_BASE;
var OUT = duration <= OUT_BASE ? duration / 2 : OUT_BASE;
var entranceBudget = duration - OUT;
var scale = baseEntranceSpan > entranceBudget ? entranceBudget / baseEntranceSpan : 1;
var timedInterval = interval * scale;
var ROW_IN = ROW_IN_BASE * scale;
var ENTRANCE_SPAN = (beatCount - 1) * timedInterval + ROW_IN;
var HOLD = Math.max(0, duration - (ENTRANCE_SPAN + OUT));
var OUT_START = ENTRANCE_SPAN + HOLD;
function fireSfx(id, t) {
root.dispatchEvent(
new CustomEvent("hf:sfx", { detail: { id: id, t: t }, bubbles: true }),
);
}
var rows = [];
for (var i = 0; i < beatCount; i += 1) {
var title = suppliedLabels[i] || "Beat " + (i + 1);
var row = document.createElement("div");
row.className = "bt-row";
row.innerHTML =
'<div class="bt-index" aria-hidden="true"></div>' +
'<div class="bt-copy"><div class="bt-title"></div><div class="bt-subtitle"></div></div>';
row.querySelector(".bt-index").textContent = String(i + 1).padStart(2, "0");
row.querySelector(".bt-title").textContent = title;
row.querySelector(".bt-subtitle").textContent =
"Cue " +
String(i + 1).padStart(2, "0") +
" · " +
(i * timedInterval).toFixed(2) +
"s";
stack.appendChild(row);
rows.push(row);
}
// Explicit entrance and exit endpoints make a direct seek to t=0
// correct without ever playing the timeline.
gsap.set(rows, { opacity: 0, y: "2cqh", scale: 0.98 });
var tl = gsap.timeline({ paused: true });
// ORCHESTRATION SPINE: every row tween and its declared cue are
// pinned to the named label, never to a duplicated numeric offset.
for (var beatIndex = 0; beatIndex < beatCount; beatIndex += 1) {
var labelName = "beat" + beatIndex;
var cueTime = beatIndex * timedInterval;
var cueId = beatIndex === beatCount - 1 ? "beat-tick-final" : "beat-tick";
tl.addLabel(labelName, cueTime);
tl.to(
rows[beatIndex],
{ opacity: 1, y: "0cqh", scale: 1, duration: ROW_IN, ease: "power2.out" },
labelName,
);
// SFX CUE (IN, beat N): one scene-mixed cue at this beat label.
tl.call(fireSfx, [cueId, cueTime], labelName);
}
// HOLD is deliberately still. OUT accelerates every landed row away
// together, asymmetrically paired with the power2.out entrances.
tl.to(rows, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);
tl.seek(0);
window.__timelines = window.__timelines || {};
window.__timelines[compositionId] = tl;
})();
</script>
</div>
</template>
</body>
</html>
```
</VariablesExplorer>
## Install
<InstallCommand command="npx hyperframes add beat-timeline" item="beat-timeline" />
That writes one file: `compositions/components/beat-timeline.html`.
## Paste it into your composition
Open `compositions/components/beat-timeline.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 |
| --- | --- | --- | --- |
| `beatCount` | `4` | 2 to 6, step 1 | Number of beat rows in the sequence. |
| `interval` | `0.6` | 0.2s to 2s, step 0.05s | Base time between consecutive beat markers. |
| `labels` | `One,Two,Three,Four` | string | Comma-separated beat titles, one per beat. Extra entries are ignored and missing entries fall back to Beat N. |
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="beat-timeline"
data-composition-src="compositions/components/beat-timeline.html"
data-variable-values='{"beatCount":4,"interval":0.6,"labels":"One,Two,Three,Four"}'
></div>
```
## Source
<Accordion title={`beat-timeline.html`}>
```html
<!doctype html>
<!--
beat-timeline -- HyperFrames video primitive (transitions / sequencing / bridge)
Concept: a visible orchestration spine made from a paused master GSAP
timeline. Each beat row is pinned to an evenly spaced named label, then
enters exactly on that mark. One mechanic, one job: bridge a sequence by
making its deterministic beat grid readable and copy-and-own-able.
Compiled-from evidence: launches-motion-vocabulary.md, "Paused, seeked
timeline orchestration" census entry (15/18 projects, 134/159 files).
Use when: a scene needs several titled beats to land in a clear order, or
when a copied composition needs a legible master-timeline sequencing spine.
Variables (declared in data-composition-variables below):
- beatCount (number, default 4): integer row count, clamped to 2..6.
- interval (number, default 0.6s): base spacing between named beat labels,
clamped to 0.2..2s before any short-duration compression.
- labels (string): comma-separated row titles. Missing entries fall back
to "Beat N" and extra entries are ignored.
Envelope (holdable orchestration adaptation, never gsap.timeScale()):
ENTRANCE_SPAN = (beatCount - 1) * interval + ROW_IN_DURATION.
HOLD = max(0, D - (ENTRANCE_SPAN + OUT_BASE)); every landed row remains
fully visible and deliberately still during this elastic phase.
OUT_BASE = 0.40s; all rows fade together with power2.in at D - OUT_BASE.
If D is shorter than ENTRANCE_SPAN + OUT_BASE, interval and each row's
entrance duration scale down together so the final row still lands before
OUT. Only a host duration at or below OUT_BASE also compresses OUT, which
keeps the full lifecycle inside an otherwise impossible time box.
Sync points: beat labels are fixed offsets inside IN. Every label owns one
declared SFX cue at the same offset, never inside elastic HOLD. Beats use
"beat-tick" and the last beat uses "beat-tick-final". The primitive only
dispatches bubbling hf:sfx events; scene-level audio mixing owns playback.
Mount contract: this file is a mountable sub-composition. The runtime clones
only <template> contents, so all live styles, markup, and scripts are inside
the template. #root fills the host-owned box with no data-width/data-height,
and all internal geometry is based on its own cqw/cqh container. Variables
come from window.__hyperframes.getVariables(), because document.documentElement
belongs to the host after mounting.
-->
<html
lang="en"
data-composition-variables='[
{ "id": "beatCount", "type": "number", "role": "content", "label": "Beat count", "description": "Number of beat rows in the sequence.", "default": 4, "min": 2, "max": 6, "step": 1 },
{ "id": "interval", "type": "number", "role": "layout", "label": "Interval", "description": "Base time between consecutive beat markers.", "default": 0.6, "min": 0.2, "max": 2, "step": 0.05, "unit": "s" },
{ "id": "labels", "type": "string", "role": "content", "label": "Labels", "description": "Comma-separated beat titles, one per beat. Extra entries are ignored and missing entries fall back to Beat N.", "default": "One,Two,Three,Four" }
]'
>
<head>
<meta charset="UTF-8" />
<title>Beat Timeline</title>
<!-- Metadata only. The loader reads variable declarations from <html>,
then discards everything outside <template> during mounting. -->
</head>
<body>
<template>
<div
id="root"
data-composition-id="beat-timeline"
data-start="0"
data-duration="5.5"
data-fps="30"
>
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
/* Root is styled by ID for mounted CSS scoping. It owns no stage
dimensions, only the host box and the container-unit basis. */
#root {
--ease-standard: cubic-bezier(0.215, 0.61, 0.355, 1);
--ease-exit: cubic-bezier(0.55, 0.055, 0.675, 0.19);
position: absolute;
inset: 0;
container-type: size;
isolation: isolate;
overflow: hidden;
background: var(--bg, Canvas);
color: var(--fg, CanvasText);
font-family: var(--font-body, system-ui, sans-serif);
}
.bt-clip {
width: 100%;
height: 100%;
display: grid;
place-items: center;
}
.bt-stack {
width: 84cqw;
display: flex;
flex-direction: column;
gap: 1.4cqh;
}
/* EDIT ZONE: row geometry only. Motion timing is owned by the script's
RETIME RANGE below, and theme paint remains token-driven here. */
.bt-row {
min-height: 10cqh;
display: grid;
grid-template-columns: 6cqw 1fr;
align-items: center;
column-gap: 2.6cqw;
padding: 1.4cqh 2.4cqw;
border: 0.12cqw solid var(--border, currentColor);
border-radius: var(--radius, 2cqh);
background: var(--surface, Canvas);
box-shadow: 0 1.2cqh 4cqh color-mix(in srgb, var(--bg, Canvas) 52%, transparent);
}
.bt-index {
width: 6cqw;
height: 6cqw;
display: grid;
place-items: center;
border-radius: 50%;
background: var(--brand, currentColor);
color: var(--bg, Canvas);
font-family: var(--font-display, system-ui, sans-serif);
font-size: 1.8cqw;
font-weight: 750;
line-height: 1;
}
.bt-copy {
min-width: 0;
}
.bt-title {
overflow: hidden;
color: var(--fg, CanvasText);
font-family: var(--font-display, system-ui, sans-serif);
font-size: min(4.4cqw, 5.2cqh);
font-weight: 700;
line-height: 1.04;
letter-spacing: -0.08cqw;
text-overflow: ellipsis;
white-space: nowrap;
}
.bt-subtitle {
margin-top: 0.7cqh;
color: var(--muted, currentColor);
font-size: min(1.8cqw, 2.2cqh);
font-weight: 550;
line-height: 1.15;
letter-spacing: 0.04cqw;
}
</style>
<div
id="beat-timeline-clip"
class="bt-clip clip"
data-start="0"
data-duration="5.5"
data-track-index="0"
>
<div class="bt-stack" aria-label="Beat timeline"></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");
// Literal by contract: mounting strips data-composition-id from the
// flattened inner root, so reading the attribute post-mount would
// register under null and fail the timeline lookup.
var compositionId = "beat-timeline";
var stack = root.querySelector(".bt-stack");
// EDIT ZONE: declarations live on <html>; this runtime call is the
// single owner of declared defaults plus per-instance overrides.
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var parsedBeatCount = Number(vars.beatCount);
// INVARIANT: exactly 2..6 integer rows reach the DOM and timeline.
var beatCount = Math.max(
2,
Math.min(6, Math.round(Number.isFinite(parsedBeatCount) ? parsedBeatCount : 4)),
);
var parsedInterval = Number(vars.interval);
// INVARIANT: invalid timing falls back once, valid timing clamps to
// the declared range before duration elasticity is calculated.
var interval = Math.max(
0.2,
Math.min(2, Number.isFinite(parsedInterval) ? parsedInterval : 0.6),
);
// INVARIANT: labels is always a string; blank or missing entries
// fall back per row, while authored extra entries stay unused.
var labelsValue = vars.labels == null ? "One,Two,Three,Four" : String(vars.labels);
var suppliedLabels = labelsValue.split(",").map(function (label) {
return label.trim();
});
var parsedDuration = parseFloat(root.dataset.duration || "5.5");
// INVARIANT: the lifecycle remains finite even under a malformed
// host duration. The authored and demo durations are both 5.5s.
var duration = Math.max(0.001, Number.isFinite(parsedDuration) ? parsedDuration : 5.5);
// RETIME RANGE: these values own the whole pacing decision. The
// interval and row entrance compress together, never via timeScale.
var ROW_IN_BASE = 0.4;
var OUT_BASE = 0.4;
var baseEntranceSpan = (beatCount - 1) * interval + ROW_IN_BASE;
var OUT = duration <= OUT_BASE ? duration / 2 : OUT_BASE;
var entranceBudget = duration - OUT;
var scale = baseEntranceSpan > entranceBudget ? entranceBudget / baseEntranceSpan : 1;
var timedInterval = interval * scale;
var ROW_IN = ROW_IN_BASE * scale;
var ENTRANCE_SPAN = (beatCount - 1) * timedInterval + ROW_IN;
var HOLD = Math.max(0, duration - (ENTRANCE_SPAN + OUT));
var OUT_START = ENTRANCE_SPAN + HOLD;
function fireSfx(id, t) {
root.dispatchEvent(
new CustomEvent("hf:sfx", { detail: { id: id, t: t }, bubbles: true }),
);
}
var rows = [];
for (var i = 0; i < beatCount; i += 1) {
var title = suppliedLabels[i] || "Beat " + (i + 1);
var row = document.createElement("div");
row.className = "bt-row";
row.innerHTML =
'<div class="bt-index" aria-hidden="true"></div>' +
'<div class="bt-copy"><div class="bt-title"></div><div class="bt-subtitle"></div></div>';
row.querySelector(".bt-index").textContent = String(i + 1).padStart(2, "0");
row.querySelector(".bt-title").textContent = title;
row.querySelector(".bt-subtitle").textContent =
"Cue " +
String(i + 1).padStart(2, "0") +
" · " +
(i * timedInterval).toFixed(2) +
"s";
stack.appendChild(row);
rows.push(row);
}
// Explicit entrance and exit endpoints make a direct seek to t=0
// correct without ever playing the timeline.
gsap.set(rows, { opacity: 0, y: "2cqh", scale: 0.98 });
var tl = gsap.timeline({ paused: true });
// ORCHESTRATION SPINE: every row tween and its declared cue are
// pinned to the named label, never to a duplicated numeric offset.
for (var beatIndex = 0; beatIndex < beatCount; beatIndex += 1) {
var labelName = "beat" + beatIndex;
var cueTime = beatIndex * timedInterval;
var cueId = beatIndex === beatCount - 1 ? "beat-tick-final" : "beat-tick";
tl.addLabel(labelName, cueTime);
tl.to(
rows[beatIndex],
{ opacity: 1, y: "0cqh", scale: 1, duration: ROW_IN, ease: "power2.out" },
labelName,
);
// SFX CUE (IN, beat N): one scene-mixed cue at this beat label.
tl.call(fireSfx, [cueId, cueTime], labelName);
}
// HOLD is deliberately still. OUT accelerates every landed row away
// together, asymmetrically paired with the power2.out entrances.
tl.to(rows, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);
tl.seek(0);
window.__timelines = window.__timelines || {};
window.__timelines[compositionId] = tl;
})();
</script>
</div>
</template>
</body>
</html>
```
</Accordion>
{/* hf:generated-footer */}
Tagged `orchestration` `transitions` `sequencing` `bridge` `timeline`.
## 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