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hyperframes/docs/catalog/components/beat-accent.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: "Beat Accent"
description: "A single music-hit sting: impact flash, micro scale-pulse on the subject, immediate decay."
---
import { InstallCommand } from "/snippets/install-command.jsx";
import { VariablesExplorer } from "/snippets/variables-explorer.jsx";
<VariablesExplorer
previewSrc="/public/catalog/components/beat-accent.json"
compositionId="beat-accent"
compositionSrc="compositions/components/beat-accent.html"
variables={[{"id":"text","type":"string","role":"content","label":"Accent text","description":"Word or short label emphasized by the beat hit.","default":"BOOM"},{"id":"flashColor","type":"enum","role":"style","label":"Flash color","description":"Token-backed accent tone used by the radial flash.","default":"accent","options":[{"value":"accent","label":"Accent"},{"value":"soft","label":"Soft accent"},{"value":"bright","label":"Bright accent"}]},{"id":"intensity","type":"number","role":"timing","label":"Intensity","description":"Strength of the scale pulse, flash, and shake.","default":1,"min":0.5,"max":2,"step":0.1}]}
>
```html beat-accent.html
<!doctype html>
<!--
beat-accent: HyperFrames video primitive (effects / burst / emphasize)
Concept: a single music-hit sting. A centered word snaps up in scale as a
radial impact flash erupts behind it, shakes by a small amount, then settles
immediately. One mechanic, one job: visual punctuation on one beat during IN.
This burst fires once and never loops. HOLD stays deliberately calm and still
after the decay.
Compiled-from evidence: Video Primitives v1 GAP C1, "sting: impact
flash/scale on a music hit." The candidates catalog describes a C1 gap:
music-driven films need visual punctuation on the downbeat and had nothing
atomic to reach for. A declared sync point makes the primitive weldable to
any audio hit. Catalog shelf: effects / burst / emphasize. The impact uses
the easing vocabulary's --ease-slam, GSAP expo.out, with the CSS mirror
cubic-bezier(0.19, 1, 0.22, 1), kept brief per taste rule 3.
Use when: one downbeat, edit point, reveal, or hard musical hit needs a short
visual accent. Mount it over the subject or use its centered word as the
subject. Do not use it as an ambient loop or a repeated visualizer.
Variables (declared in data-composition-variables below):
- text (string, default "BOOM"): the word or label that receives the hit.
- flashColor (enum, default "accent"): accent, soft accent, or bright
accent. Every option is derived from var(--accent), so theme changes
always repaint the flash.
- intensity (number, 0.5 to 2, default 1, step 0.1): scales subject pulse,
flash opacity and spread, and shake distance as one legible control.
Envelope (fixed IN/OUT, elastic HOLD only, never gsap.timeScale()):
IN_BASE = 0.90s, calm lead, impact snap, flash, shake, and full decay
HOLD = elastic = max(0, D - (IN_BASE + OUT_BASE)), deliberately still
OUT_BASE = 0.40s, clean release fade
If D < IN_BASE + OUT_BASE, IN and OUT scale down together so IN + OUT == D
and HOLD == 0. All fixed offsets and motion durations use the same scale.
Sync point: impact-hard lands at IMPACT_AT = 0.25s into an unscaled IN. It
scales proportionally only when the full envelope is compressed. ADR-0007
requires declared sync points to remain in a fixed phase, never inside the
elastic HOLD, so audio and visual timing cannot drift as duration changes.
Sound cue: the primitive never plays audio. At IMPACT_AT it dispatches a
bubbling `hf:sfx` CustomEvent with detail { id: "impact-hard", t: IMPACT_AT }.
A host mix stage may catch that event and route the id to its chosen asset.
Mount contract: this file is a MOUNTABLE SUB-COMPOSITION, not a standalone
composition. A host loads it via data-composition-src; the runtime clones
only <template> contents, while everything outside <template>, including
<head>, is discarded on mount. #root has no data-width or data-height. It is
styled by id, never by class, and fills the host box with position:absolute,
inset:0, container-type:size. Variables are read through
window.__hyperframes.getVariables(), never by parsing document.documentElement,
because the mounted document element belongs to the host composition.
-->
<html
lang="en"
data-composition-variables='[
{ "id": "text", "type": "string", "role": "content", "label": "Accent text", "description": "Word or short label emphasized by the beat hit.", "default": "BOOM" },
{ "id": "flashColor", "type": "enum", "role": "style", "label": "Flash color", "description": "Token-backed accent tone used by the radial flash.", "default": "accent", "options": [{ "value": "accent", "label": "Accent" }, { "value": "soft", "label": "Soft accent" }, { "value": "bright", "label": "Bright accent" }] },
{ "id": "intensity", "type": "number", "role": "timing", "label": "Intensity", "description": "Strength of the scale pulse, flash, and shake.", "default": 1, "min": 0.5, "max": 2, "step": 0.1 }
]'
>
<head>
<meta charset="UTF-8" />
<title>Beat Accent</title>
</head>
<body>
<template>
<div id="root" data-composition-id="beat-accent" data-duration="4" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
#root {
--ease-slam: cubic-bezier(0.19, 1, 0.22, 1);
--ba-flash-color: var(--accent, #ff4f8b);
position: absolute;
inset: 0;
container-type: size;
isolation: isolate;
overflow: hidden;
background: var(--bg, #0b1120);
color: var(--fg, #f8fafc);
font-family: var(--font-body, system-ui, sans-serif);
pointer-events: none;
}
.ba-clip {
position: absolute;
inset: 0;
display: grid;
place-items: center;
overflow: hidden;
}
.ba-stage {
position: relative;
width: 100%;
height: 100%;
display: grid;
place-items: center;
will-change: transform, opacity;
}
.ba-flash {
position: absolute;
width: 62cqw;
aspect-ratio: 1;
border-radius: 50%;
background: radial-gradient(
circle,
color-mix(in srgb, var(--ba-flash-color) 92%, transparent) 0%,
color-mix(in srgb, var(--ba-flash-color) 54%, transparent) 24%,
color-mix(in srgb, var(--ba-flash-color) 16%, transparent) 48%,
transparent 72%
);
opacity: 0;
will-change: transform, opacity;
}
.ba-flash::after {
content: "";
position: absolute;
inset: 22%;
border: 0.45cqmin solid color-mix(in srgb, var(--ba-flash-color) 78%, transparent);
border-radius: 50%;
}
.ba-subject {
position: relative;
z-index: 1;
display: block;
width: 86cqw;
color: var(--fg, #f8fafc);
font-family: var(--font-display, var(--font-body, system-ui, sans-serif));
font-size: 20cqmin;
font-weight: 900;
line-height: 0.9;
letter-spacing: -0.055em;
text-align: center;
text-transform: uppercase;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
text-shadow:
0 0 2cqmin color-mix(in srgb, var(--accent, #ff4f8b) 46%, transparent),
0 1.2cqh 3.8cqh color-mix(in srgb, var(--bg, #0b1120) 68%, transparent);
transform-origin: 50% 50%;
will-change: transform;
}
</style>
<div
id="beat-accent-clip"
class="ba-clip clip"
data-start="0"
data-duration="4"
data-track-index="0"
>
<div class="ba-stage">
<div class="ba-flash" aria-hidden="true"></div>
<div class="ba-subject"></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(".ba-stage");
var flash = root.querySelector(".ba-flash");
var subject = root.querySelector(".ba-subject");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var text = vars.text == null ? "BOOM" : String(vars.text);
var flashChoice =
vars.flashColor === "soft" || vars.flashColor === "bright"
? vars.flashColor
: "accent";
var intensityValue = Number(vars.intensity);
var intensity = Number.isFinite(intensityValue)
? Math.max(0.5, Math.min(2, intensityValue))
: 1;
var flashColors = {
accent: "var(--accent, #ff4f8b)",
soft: "color-mix(in srgb, var(--accent, #ff4f8b) 70%, var(--bg, #0b1120))",
bright: "color-mix(in srgb, var(--accent, #ff4f8b) 72%, var(--fg, #f8fafc))",
};
subject.textContent = text;
root.style.setProperty("--ba-flash-color", flashColors[flashChoice]);
var IN_BASE = 0.9;
var OUT_BASE = 0.4;
var IMPACT_AT_BASE = 0.25;
var SNAP_BASE = 0.12;
var SETTLE_BASE = 0.28;
var FLASH_IN_BASE = 0.08;
var FLASH_OUT_BASE = 0.28;
var duration = Math.max(0.001, parseFloat(root.dataset.duration || "4"));
var totalBase = IN_BASE + OUT_BASE;
var envelopeScale = duration < totalBase ? duration / totalBase : 1;
var IN = IN_BASE * envelopeScale;
var OUT = OUT_BASE * envelopeScale;
var IMPACT_AT = IMPACT_AT_BASE * envelopeScale;
var SNAP = SNAP_BASE * envelopeScale;
var SETTLE = SETTLE_BASE * envelopeScale;
var FLASH_IN = FLASH_IN_BASE * envelopeScale;
var FLASH_OUT = FLASH_OUT_BASE * envelopeScale;
var HOLD = Math.max(0, duration - (IN + OUT));
var OUT_START = IN + HOLD;
var restScale = 1 - 0.06 * intensity;
var peakScale = 1 + 0.18 * intensity;
var flashPeakScale = 0.78 + 0.3 * intensity;
var flashEndScale = 1.08 + 0.32 * intensity;
var flashPeakOpacity = Math.min(0.96, 0.5 + 0.23 * intensity);
var shakeX = 0.9 * intensity;
var shakeY = 0.34 * intensity;
gsap.set(stage, { x: 0, y: 0, opacity: 1 });
gsap.set(subject, { scale: restScale });
gsap.set(flash, { scale: 0.25, opacity: 0 });
var tl = gsap.timeline({ paused: true });
tl.to(subject, { scale: peakScale, duration: SNAP, ease: "expo.out" }, IMPACT_AT);
tl.to(subject, { scale: 1, duration: SETTLE, ease: "power3.out" }, IMPACT_AT + SNAP);
tl.to(
flash,
{
scale: flashPeakScale,
opacity: flashPeakOpacity,
duration: FLASH_IN,
ease: "expo.out",
},
IMPACT_AT,
);
tl.to(
flash,
{ scale: flashEndScale, opacity: 0, duration: FLASH_OUT, ease: "power3.out" },
IMPACT_AT + FLASH_IN,
);
tl.to(
stage,
{
x: shakeX + "cqw",
y: -shakeY + "cqh",
duration: 0.04 * envelopeScale,
ease: "none",
},
IMPACT_AT,
);
tl.to(
stage,
{
x: -shakeX * 0.7 + "cqw",
y: shakeY * 0.75 + "cqh",
duration: 0.05 * envelopeScale,
ease: "none",
},
IMPACT_AT + 0.04 * envelopeScale,
);
tl.to(
stage,
{
x: shakeX * 0.3 + "cqw",
y: -shakeY * 0.35 + "cqh",
duration: 0.05 * envelopeScale,
ease: "none",
},
IMPACT_AT + 0.09 * envelopeScale,
);
tl.to(
stage,
{
x: 0,
y: 0,
duration: 0.12 * envelopeScale,
ease: "power3.out",
},
IMPACT_AT + 0.14 * envelopeScale,
);
tl.call(
function () {
root.dispatchEvent(
new CustomEvent("hf:sfx", {
detail: { id: "impact-hard", t: IMPACT_AT },
bubbles: true,
}),
);
},
[],
IMPACT_AT,
);
tl.to(stage, { opacity: 0, duration: OUT, ease: "power2.out" }, OUT_START);
tl.seek(0);
window.__timelines = window.__timelines || {};
// Literal id is required. Mount flattening strips data-composition-id
// from this inner root, so reading the id from root would register
// under null and leave the host unable to find this timeline.
window.__timelines["beat-accent"] = tl;
})();
</script>
</div>
</template>
</body>
</html>
```
</VariablesExplorer>
## Install
<InstallCommand command="npx hyperframes add beat-accent" item="beat-accent" />
That writes one file: `compositions/components/beat-accent.html`.
## Paste it into your composition
Open `compositions/components/beat-accent.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 |
| --- | --- | --- | --- |
| `text` | `BOOM` | string | Word or short label emphasized by the beat hit. |
| `flashColor` | `accent` | `accent`, `soft`, `bright` | Token-backed accent tone used by the radial flash. |
| `intensity` | `1` | 0.5 to 2, step 0.1 | Strength of the scale pulse, flash, and shake. |
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-accent"
data-composition-src="compositions/components/beat-accent.html"
data-variable-values='{"text":"BOOM","flashColor":"accent","intensity":1}'
></div>
```
## Source
<Accordion title={`beat-accent.html`}>
```html
<!doctype html>
<!--
beat-accent: HyperFrames video primitive (effects / burst / emphasize)
Concept: a single music-hit sting. A centered word snaps up in scale as a
radial impact flash erupts behind it, shakes by a small amount, then settles
immediately. One mechanic, one job: visual punctuation on one beat during IN.
This burst fires once and never loops. HOLD stays deliberately calm and still
after the decay.
Compiled-from evidence: Video Primitives v1 GAP C1, "sting: impact
flash/scale on a music hit." The candidates catalog describes a C1 gap:
music-driven films need visual punctuation on the downbeat and had nothing
atomic to reach for. A declared sync point makes the primitive weldable to
any audio hit. Catalog shelf: effects / burst / emphasize. The impact uses
the easing vocabulary's --ease-slam, GSAP expo.out, with the CSS mirror
cubic-bezier(0.19, 1, 0.22, 1), kept brief per taste rule 3.
Use when: one downbeat, edit point, reveal, or hard musical hit needs a short
visual accent. Mount it over the subject or use its centered word as the
subject. Do not use it as an ambient loop or a repeated visualizer.
Variables (declared in data-composition-variables below):
- text (string, default "BOOM"): the word or label that receives the hit.
- flashColor (enum, default "accent"): accent, soft accent, or bright
accent. Every option is derived from var(--accent), so theme changes
always repaint the flash.
- intensity (number, 0.5 to 2, default 1, step 0.1): scales subject pulse,
flash opacity and spread, and shake distance as one legible control.
Envelope (fixed IN/OUT, elastic HOLD only, never gsap.timeScale()):
IN_BASE = 0.90s, calm lead, impact snap, flash, shake, and full decay
HOLD = elastic = max(0, D - (IN_BASE + OUT_BASE)), deliberately still
OUT_BASE = 0.40s, clean release fade
If D < IN_BASE + OUT_BASE, IN and OUT scale down together so IN + OUT == D
and HOLD == 0. All fixed offsets and motion durations use the same scale.
Sync point: impact-hard lands at IMPACT_AT = 0.25s into an unscaled IN. It
scales proportionally only when the full envelope is compressed. ADR-0007
requires declared sync points to remain in a fixed phase, never inside the
elastic HOLD, so audio and visual timing cannot drift as duration changes.
Sound cue: the primitive never plays audio. At IMPACT_AT it dispatches a
bubbling `hf:sfx` CustomEvent with detail { id: "impact-hard", t: IMPACT_AT }.
A host mix stage may catch that event and route the id to its chosen asset.
Mount contract: this file is a MOUNTABLE SUB-COMPOSITION, not a standalone
composition. A host loads it via data-composition-src; the runtime clones
only <template> contents, while everything outside <template>, including
<head>, is discarded on mount. #root has no data-width or data-height. It is
styled by id, never by class, and fills the host box with position:absolute,
inset:0, container-type:size. Variables are read through
window.__hyperframes.getVariables(), never by parsing document.documentElement,
because the mounted document element belongs to the host composition.
-->
<html
lang="en"
data-composition-variables='[
{ "id": "text", "type": "string", "role": "content", "label": "Accent text", "description": "Word or short label emphasized by the beat hit.", "default": "BOOM" },
{ "id": "flashColor", "type": "enum", "role": "style", "label": "Flash color", "description": "Token-backed accent tone used by the radial flash.", "default": "accent", "options": [{ "value": "accent", "label": "Accent" }, { "value": "soft", "label": "Soft accent" }, { "value": "bright", "label": "Bright accent" }] },
{ "id": "intensity", "type": "number", "role": "timing", "label": "Intensity", "description": "Strength of the scale pulse, flash, and shake.", "default": 1, "min": 0.5, "max": 2, "step": 0.1 }
]'
>
<head>
<meta charset="UTF-8" />
<title>Beat Accent</title>
</head>
<body>
<template>
<div id="root" data-composition-id="beat-accent" data-duration="4" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
#root {
--ease-slam: cubic-bezier(0.19, 1, 0.22, 1);
--ba-flash-color: var(--accent, #ff4f8b);
position: absolute;
inset: 0;
container-type: size;
isolation: isolate;
overflow: hidden;
background: var(--bg, #0b1120);
color: var(--fg, #f8fafc);
font-family: var(--font-body, system-ui, sans-serif);
pointer-events: none;
}
.ba-clip {
position: absolute;
inset: 0;
display: grid;
place-items: center;
overflow: hidden;
}
.ba-stage {
position: relative;
width: 100%;
height: 100%;
display: grid;
place-items: center;
will-change: transform, opacity;
}
.ba-flash {
position: absolute;
width: 62cqw;
aspect-ratio: 1;
border-radius: 50%;
background: radial-gradient(
circle,
color-mix(in srgb, var(--ba-flash-color) 92%, transparent) 0%,
color-mix(in srgb, var(--ba-flash-color) 54%, transparent) 24%,
color-mix(in srgb, var(--ba-flash-color) 16%, transparent) 48%,
transparent 72%
);
opacity: 0;
will-change: transform, opacity;
}
.ba-flash::after {
content: "";
position: absolute;
inset: 22%;
border: 0.45cqmin solid color-mix(in srgb, var(--ba-flash-color) 78%, transparent);
border-radius: 50%;
}
.ba-subject {
position: relative;
z-index: 1;
display: block;
width: 86cqw;
color: var(--fg, #f8fafc);
font-family: var(--font-display, var(--font-body, system-ui, sans-serif));
font-size: 20cqmin;
font-weight: 900;
line-height: 0.9;
letter-spacing: -0.055em;
text-align: center;
text-transform: uppercase;
white-space: nowrap;
overflow: hidden;
text-overflow: ellipsis;
text-shadow:
0 0 2cqmin color-mix(in srgb, var(--accent, #ff4f8b) 46%, transparent),
0 1.2cqh 3.8cqh color-mix(in srgb, var(--bg, #0b1120) 68%, transparent);
transform-origin: 50% 50%;
will-change: transform;
}
</style>
<div
id="beat-accent-clip"
class="ba-clip clip"
data-start="0"
data-duration="4"
data-track-index="0"
>
<div class="ba-stage">
<div class="ba-flash" aria-hidden="true"></div>
<div class="ba-subject"></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(".ba-stage");
var flash = root.querySelector(".ba-flash");
var subject = root.querySelector(".ba-subject");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var text = vars.text == null ? "BOOM" : String(vars.text);
var flashChoice =
vars.flashColor === "soft" || vars.flashColor === "bright"
? vars.flashColor
: "accent";
var intensityValue = Number(vars.intensity);
var intensity = Number.isFinite(intensityValue)
? Math.max(0.5, Math.min(2, intensityValue))
: 1;
var flashColors = {
accent: "var(--accent, #ff4f8b)",
soft: "color-mix(in srgb, var(--accent, #ff4f8b) 70%, var(--bg, #0b1120))",
bright: "color-mix(in srgb, var(--accent, #ff4f8b) 72%, var(--fg, #f8fafc))",
};
subject.textContent = text;
root.style.setProperty("--ba-flash-color", flashColors[flashChoice]);
var IN_BASE = 0.9;
var OUT_BASE = 0.4;
var IMPACT_AT_BASE = 0.25;
var SNAP_BASE = 0.12;
var SETTLE_BASE = 0.28;
var FLASH_IN_BASE = 0.08;
var FLASH_OUT_BASE = 0.28;
var duration = Math.max(0.001, parseFloat(root.dataset.duration || "4"));
var totalBase = IN_BASE + OUT_BASE;
var envelopeScale = duration < totalBase ? duration / totalBase : 1;
var IN = IN_BASE * envelopeScale;
var OUT = OUT_BASE * envelopeScale;
var IMPACT_AT = IMPACT_AT_BASE * envelopeScale;
var SNAP = SNAP_BASE * envelopeScale;
var SETTLE = SETTLE_BASE * envelopeScale;
var FLASH_IN = FLASH_IN_BASE * envelopeScale;
var FLASH_OUT = FLASH_OUT_BASE * envelopeScale;
var HOLD = Math.max(0, duration - (IN + OUT));
var OUT_START = IN + HOLD;
var restScale = 1 - 0.06 * intensity;
var peakScale = 1 + 0.18 * intensity;
var flashPeakScale = 0.78 + 0.3 * intensity;
var flashEndScale = 1.08 + 0.32 * intensity;
var flashPeakOpacity = Math.min(0.96, 0.5 + 0.23 * intensity);
var shakeX = 0.9 * intensity;
var shakeY = 0.34 * intensity;
gsap.set(stage, { x: 0, y: 0, opacity: 1 });
gsap.set(subject, { scale: restScale });
gsap.set(flash, { scale: 0.25, opacity: 0 });
var tl = gsap.timeline({ paused: true });
tl.to(subject, { scale: peakScale, duration: SNAP, ease: "expo.out" }, IMPACT_AT);
tl.to(subject, { scale: 1, duration: SETTLE, ease: "power3.out" }, IMPACT_AT + SNAP);
tl.to(
flash,
{
scale: flashPeakScale,
opacity: flashPeakOpacity,
duration: FLASH_IN,
ease: "expo.out",
},
IMPACT_AT,
);
tl.to(
flash,
{ scale: flashEndScale, opacity: 0, duration: FLASH_OUT, ease: "power3.out" },
IMPACT_AT + FLASH_IN,
);
tl.to(
stage,
{
x: shakeX + "cqw",
y: -shakeY + "cqh",
duration: 0.04 * envelopeScale,
ease: "none",
},
IMPACT_AT,
);
tl.to(
stage,
{
x: -shakeX * 0.7 + "cqw",
y: shakeY * 0.75 + "cqh",
duration: 0.05 * envelopeScale,
ease: "none",
},
IMPACT_AT + 0.04 * envelopeScale,
);
tl.to(
stage,
{
x: shakeX * 0.3 + "cqw",
y: -shakeY * 0.35 + "cqh",
duration: 0.05 * envelopeScale,
ease: "none",
},
IMPACT_AT + 0.09 * envelopeScale,
);
tl.to(
stage,
{
x: 0,
y: 0,
duration: 0.12 * envelopeScale,
ease: "power3.out",
},
IMPACT_AT + 0.14 * envelopeScale,
);
tl.call(
function () {
root.dispatchEvent(
new CustomEvent("hf:sfx", {
detail: { id: "impact-hard", t: IMPACT_AT },
bubbles: true,
}),
);
},
[],
IMPACT_AT,
);
tl.to(stage, { opacity: 0, duration: OUT, ease: "power2.out" }, OUT_START);
tl.seek(0);
window.__timelines = window.__timelines || {};
// Literal id is required. Mount flattening strips data-composition-id
// from this inner root, so reading the id from root would register
// under null and leave the host unable to find this timeline.
window.__timelines["beat-accent"] = tl;
})();
</script>
</div>
</template>
</body>
</html>
```
</Accordion>
{/* hf:generated-footer */}
Tagged `motion-primitive` `effects` `burst` `sting` `emphasize` `impact`.
## Related topics
- [Browse the complete Catalog](/catalog)
- [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
- [Build a richer composition](/go-further)
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