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hyperframes/docs/catalog/components/whip-pan-cut.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: "Whip Pan Cut"
description: "A full-frame whip pan: scene A whips off laterally with capped directional motion blur while scene B enters in the same direction at matched velocity, on a speed-ramp profile with a decelerating catch. Both scenes ride one strip, so seam velocity is exact by construction. Callers fill the named before/after slot panels; token-styled defaults render when a slot is left empty."
---
import { InstallCommand } from "/snippets/install-command.jsx";
import { VariablesExplorer } from "/snippets/variables-explorer.jsx";
<VariablesExplorer
previewSrc="/public/catalog/components/whip-pan-cut.json"
compositionId="whip-pan-cut"
compositionSrc="compositions/components/whip-pan-cut.html"
variables={[{"id":"direction","type":"enum","role":"motion","label":"Direction","description":"Shared travel direction for the outgoing and incoming scenes.","default":"left","options":[{"value":"left","label":"Left"},{"value":"right","label":"Right"}]},{"id":"whip_at","type":"number","role":"timing","label":"Whip start","description":"Seconds after mount start when the whip begins.","default":0.25,"min":0,"max":8,"step":0.05,"unit":"s"},{"id":"accent","type":"enum","role":"style","label":"Accent","description":"Seam hairline and default after art tint.","default":"green","options":[{"value":"green","label":"Green"},{"value":"blue","label":"Blue"},{"value":"violet","label":"Violet"}]},{"id":"exit","type":"enum","role":"timing","label":"Exit","description":"Optional departure of the landed scene. Default none: it rests until the frame cuts.","default":"none","options":[{"value":"none","label":"None"},{"value":"fade","label":"Fade"},{"value":"up","label":"Up"}]}]}
>
```html whip-pan-cut.html
<!doctype html>
<!--
whip-pan-cut: HyperFrames video primitive (transitions / bridge)
Concept: the louder sibling of cut-the-curve. Scene A whips off laterally
with directional motion blur while scene B enters in the same direction at
matched velocity, on a speed-ramp profile (accelerate, fast middle,
decelerating catch). Two full-bleed content slots (the before-after-wipe
convention) with token-styled defaults.
Wave K, unit K6. Velocity matching is structural: both scenes ride ONE
strip (B docked one frame-width beyond A along the travel direction) and
the strip runs a single power3.inOut tween, so the seam velocity is exact
by construction and the profile is fast-middle with a decelerating catch.
Motion blur follows the motion-blur-streak recipe: a directional SVG
feGaussianBlur (stdDeviation "X 0", horizontal axis only) applied to the
mover (the strip carries both transform and filter; nothing else is
filtered, and there is no 3D on the strip for the filter to flatten). The
blur envelope is CAPPED at 16px and peaks exactly at mid-whip (peak
velocity), resolving to 0 at both ends: power3.in up over the first half,
power3.out down over the second, mirroring the strip's inOut velocity. The
proxy value is re-written on every seek via onUpdate and seeded at setup so
frame 0 renders sharp.
A hairline accent seam rides the boundary between the two scenes; it is
visible only while the whip runs, so it reads as the frame edge screaming
past rather than persistent chrome.
Slots (see README.md for a worked example):
- [data-slot="before"]: scene A, on stage at mount. Replace the children
of this element in your installed copy. Default: a muted token
wireframe.
- [data-slot="after"]: scene B, whipping in. Same mechanism. Default: a
brand-tinted version of the wireframe.
Direct img/video children of a slot are sized to cover the panel.
Variables (declared in data-composition-variables below):
- direction (left | right, default left): shared travel direction for
both scenes.
- whip_at (number, seconds, default 0.25): when the whip starts, relative
to mount start. Clamped so the whip always completes inside the clip.
- accent (green | blue | violet, default green): seam hairline and the
default after art tint. green maps to --brand, blue to --accent,
violet to --accent-2.
- exit (none | fade | up, default none): optional departure of the landed
scene B. Enabling it reserves a short tail window (min(0.35s, 25% of
D)) after B lands.
Envelope (transition profile, cut-the-curve precedent; the catch may still
be decelerating when a short clip window ends):
LEAD = whip_at (scene A rests, readable)
WHIP = 0.55s, power3.inOut, one frame-width of travel
REST = elastic remainder, dead still on B
EXIT = 0 when exit is none, else min(0.35s, 25% of D)
If D < LEAD + WHIP + EXIT, LEAD and WHIP scale down together.
Sync point: whip-cut at LEAD + WHIP/2 (peak velocity, 0.53s at defaults).
Sound cue: dispatches a bubbling `hf:sfx` CustomEvent with id "whip-cut"
at peak velocity. This primitive never plays audio.
Interruptible springs law (L1): the whip is a single owned tween on one
strip; a host redirect retargets the same transform channel and GSAP's
default overwrite preserves current velocity-position state at the
interruption frame (no snap-to-zero).
Mount contract: MOUNTABLE SUB-COMPOSITION. The runtime clones only
<template> contents; #root fills the host box (inset:0, container-type:
size), has no data-width/data-height, and registers one paused timeline
under the literal "whip-pan-cut" key (mount flattening strips
data-composition-id from the live root). Variables come from
window.__hyperframes.getVariables().
-->
<html
lang="en"
data-composition-id="whip-pan-cut"
data-composition-duration="1.2"
data-composition-variables='[
{ "id": "direction", "type": "enum", "role": "motion", "label": "Direction", "description": "Shared travel direction for the outgoing and incoming scenes.", "default": "left", "options": [{ "value": "left", "label": "Left" }, { "value": "right", "label": "Right" }] },
{ "id": "whip_at", "type": "number", "role": "timing", "label": "Whip start", "description": "Seconds after mount start when the whip begins.", "default": 0.25, "min": 0, "max": 8, "step": 0.05, "unit": "s" },
{ "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Seam hairline and default after art tint.", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
{ "id": "exit", "type": "enum", "role": "timing", "label": "Exit", "description": "Optional departure of the landed scene. Default none: it rests until the frame cuts.", "default": "none", "options": [{ "value": "none", "label": "None" }, { "value": "fade", "label": "Fade" }, { "value": "up", "label": "Up" }] }
]'
>
<head>
<meta charset="UTF-8" />
<title>Whip Pan Cut</title>
</head>
<body>
<template>
<div id="root" data-composition-id="whip-pan-cut" data-duration="1.2" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
/* Root fills the host-owned box. Internal measurements use cqw/cqh
and every painted color comes from a contract token. */
#root {
position: absolute;
inset: 0;
container-type: size;
isolation: isolate;
overflow: hidden;
background: var(--bg, #07111f);
color: var(--fg, #f8fafc);
font-family: var(--font-body, Inter, system-ui, sans-serif);
}
.wpc-clip,
.wpc-strip,
.wpc-panel,
.wpc-slot {
position: absolute;
inset: 0;
width: 100%;
height: 100%;
}
.wpc-clip {
overflow: hidden;
}
/* The strip is the ONE mover: it carries both scenes, the transform
tween, and the directional blur filter. No 3D lives on it, so the
filter has nothing to flatten. */
.wpc-strip {
filter: url("#wpc-blur");
will-change: transform, filter;
}
.wpc-panel {
overflow: hidden;
}
/* Scene B docks one frame-width beyond scene A along the travel
direction, so the pan crosses one continuous surface. */
#root[data-direction="left"] .wpc-after {
left: 100%;
}
#root[data-direction="right"] .wpc-after {
left: -100%;
}
/* The seam hairline rides the boundary between the two scenes and
is timeline-owned: visible only while the whip runs. */
.wpc-seam {
position: absolute;
z-index: 3;
top: 0;
bottom: 0;
width: 0.35cqw;
transform: translateX(-50%);
background: var(--wpc-accent, #22c55e);
pointer-events: none;
}
#root[data-direction="left"] .wpc-seam {
left: 100%;
}
#root[data-direction="right"] .wpc-seam {
left: 0;
}
/* Caller-supplied media covers its panel edge to edge. */
.wpc-slot > img,
.wpc-slot > video {
position: absolute;
inset: 0;
width: 100%;
height: 100%;
object-fit: cover;
}
/* Token-styled default slot content: a wireframe card that reads
muted on the before layer and brand-tinted on the after layer.
Callers replacing slot children never see any of this. */
.wpc-default {
position: absolute;
inset: 0;
display: grid;
place-items: center;
}
.wpc-before .wpc-default {
background:
linear-gradient(
color-mix(in srgb, var(--border, #334155) 34%, transparent) 0.12cqw,
transparent 0.12cqw
)
0 0 / 5cqw 5cqw,
linear-gradient(
90deg,
color-mix(in srgb, var(--border, #334155) 34%, transparent) 0.12cqw,
transparent 0.12cqw
)
0 0 / 5cqw 5cqw,
var(--surface, #172033);
}
.wpc-after .wpc-default {
background: linear-gradient(
135deg,
color-mix(in srgb, var(--brand, #22c55e) 32%, var(--surface, #172033)) 0%,
var(--surface, #172033) 58%,
color-mix(in srgb, var(--wpc-accent, #22c55e) 22%, var(--surface, #172033)) 100%
);
}
.wpc-card {
width: 56cqw;
height: 56cqh;
padding: var(--space-3, 4cqh) var(--space-3, 4cqw);
border: 0.16cqw solid var(--border, #334155);
border-radius: var(--radius, 2.4cqmin);
background: color-mix(in srgb, var(--surface, #172033) 88%, var(--bg, #07111f));
box-shadow: 0 2cqh 5cqw color-mix(in srgb, var(--bg, #07111f) 45%, transparent);
}
.wpc-after .wpc-card {
border-color: color-mix(
in srgb,
var(--wpc-accent, #22c55e) 52%,
var(--border, #334155)
);
background: color-mix(in srgb, var(--surface, #172033) 86%, var(--brand, #22c55e));
}
.wpc-bar {
width: 34%;
height: 4.4cqh;
margin-bottom: var(--space-3, 4cqh);
border-radius: 1.2cqh;
background: var(--muted, #94a3b8);
opacity: 0.5;
}
.wpc-after .wpc-bar {
background: var(--wpc-accent, #22c55e);
opacity: 0.92;
}
.wpc-line {
height: 2.4cqh;
margin-bottom: var(--space-2, 2.6cqh);
border-radius: 1.2cqh;
background: var(--muted, #94a3b8);
opacity: 0.4;
}
.wpc-line:nth-of-type(2) {
width: 92%;
}
.wpc-line:nth-of-type(3) {
width: 68%;
}
.wpc-line:nth-of-type(4) {
width: 44%;
}
.wpc-after .wpc-line {
background: color-mix(in srgb, var(--brand, #22c55e) 70%, var(--fg, #f8fafc));
opacity: 0.75;
}
</style>
<div
id="whip-pan-cut-clip"
class="wpc-clip clip"
data-start="0"
data-duration="1.2"
data-track-index="0"
>
<svg width="0" height="0" aria-hidden="true" style="position: absolute">
<defs>
<filter id="wpc-blur" x="-50%" y="-20%" width="200%" height="140%">
<feGaussianBlur class="wpc-blur-node" in="SourceGraphic" stdDeviation="0 0" />
</filter>
</defs>
</svg>
<div class="wpc-strip">
<section class="wpc-panel wpc-before" aria-label="Outgoing scene">
<div class="wpc-slot" data-slot="before">
<!-- SLOT "before": replace the children of this element with
your own content (img, video, or HTML). -->
<div class="wpc-default" aria-hidden="true">
<div class="wpc-card">
<div class="wpc-bar"></div>
<div class="wpc-line"></div>
<div class="wpc-line"></div>
<div class="wpc-line"></div>
</div>
</div>
</div>
</section>
<section class="wpc-panel wpc-after" aria-label="Incoming scene">
<div class="wpc-slot" data-slot="after">
<!-- SLOT "after": replace the children of this element with
your own content (img, video, or HTML). -->
<div class="wpc-default" aria-hidden="true">
<div class="wpc-card">
<div class="wpc-bar"></div>
<div class="wpc-line"></div>
<div class="wpc-line"></div>
<div class="wpc-line"></div>
</div>
</div>
</div>
</section>
<div class="wpc-seam" aria-hidden="true"></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");
// Literal id: mount flattening strips data-composition-id from the
// live root before this timeline registers.
var compositionId = "whip-pan-cut";
var strip = root.querySelector(".wpc-strip");
var seam = root.querySelector(".wpc-seam");
var blurNode = root.querySelector(".wpc-blur-node");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var direction = vars.direction === "right" ? "right" : "left";
var rawWhipAt = vars.whip_at == null ? 0.25 : Number(vars.whip_at);
var whipAt = Number.isFinite(rawWhipAt) ? Math.max(0, Math.min(8, rawWhipAt)) : 0.25;
// Each enum choice routes to a DIFFERENT contract token so the
// variable stays meaningful under a theme.
var accentColors = {
green: "var(--brand, #22c55e)",
blue: "var(--accent, #38bdf8)",
violet: "var(--accent-2, #c5a3ff)",
};
var accent = Object.prototype.hasOwnProperty.call(accentColors, vars.accent)
? vars.accent
: "green";
// The bundler mirrors composition variables as scoped CSS custom
// props, so this unit's own accent variable can shadow the
// contract --accent token inside the subtree ("blue" is a valid
// CSS color and would render pure blue). When the shadow is
// present, fall back to the literal contract value.
var computedAccent = getComputedStyle(root).getPropertyValue("--accent").trim();
if (
computedAccent === "green" ||
computedAccent === "blue" ||
computedAccent === "violet"
) {
accentColors.blue = "#38bdf8";
}
// INVARIANT: only none | fade | up reaches the timeline.
var exit = vars.exit === "fade" || vars.exit === "up" ? vars.exit : "none";
root.dataset.direction = direction;
root.style.setProperty("--wpc-accent", accentColors[accent]);
// Travel measured in px ONCE at mount (cq units inside tweened
// transform values are a seek trap). One frame-width lands scene
// B exactly where scene A stood.
var travel = root.clientWidth || 1920;
var sign = direction === "left" ? -1 : 1;
// RETIME RANGE: 0.6s to 3s. LEAD and WHIP scale together only when
// D is too short. REST absorbs any remainder; this is a transition
// profile (cut-the-curve precedent), so a short clip window may
// end while the catch is still decelerating. Never timeScale().
var WHIP_DURATION_BASE = 0.55;
var duration = Math.max(0.001, parseFloat(root.dataset.duration || "1.2"));
var EXIT = exit === "none" ? 0 : Math.min(0.35, duration * 0.25);
var scale =
duration - EXIT < whipAt + WHIP_DURATION_BASE
? (duration - EXIT) / (whipAt + WHIP_DURATION_BASE)
: 1;
var WHIP_AT = whipAt * scale;
var WHIP_DURATION = WHIP_DURATION_BASE * scale;
var WHIP_END = WHIP_AT + WHIP_DURATION;
var CUT_AT = WHIP_AT + WHIP_DURATION / 2;
var OUT_START = duration - EXIT;
// Blur cap per the motion-blur-streak recipe: peak stdDeviation
// stays well under the 30px readability ceiling.
var PEAK_BLUR = 16;
var blurProxy = { v: 0 };
function writeBlur() {
blurNode.setAttribute("stdDeviation", blurProxy.v + " 0");
}
// Seed frame 0 so a seek to t=0 renders sharp, not a stale blur.
writeBlur();
function fireSfx(id, t) {
root.dispatchEvent(
new CustomEvent("hf:sfx", { detail: { id: id, t: t }, bubbles: true }),
);
}
// Explicit both-endpoints state makes tl.seek(0) deterministic.
gsap.set(strip, { x: 0, y: 0, opacity: 1 });
gsap.set(seam, { autoAlpha: 0 });
var tl = gsap.timeline({ paused: true });
// WHIP: one strip, one speed-ramp tween. Both scenes share the
// transform, so seam velocity is matched by construction.
tl.fromTo(
strip,
{ x: 0 },
{ x: sign * travel, duration: WHIP_DURATION, ease: "power3.inOut" },
WHIP_AT,
);
// Blur envelope: peaks at mid-whip (peak velocity), zero at both
// ends. power3.in up / power3.out down mirrors the inOut ramp.
tl.to(
blurProxy,
{ v: PEAK_BLUR, duration: WHIP_DURATION / 2, ease: "power3.in", onUpdate: writeBlur },
WHIP_AT,
);
tl.to(
blurProxy,
{ v: 0, duration: WHIP_DURATION / 2, ease: "power3.out", onUpdate: writeBlur },
WHIP_AT + WHIP_DURATION / 2,
);
// Seam hairline: alive only while the whip runs.
tl.fromTo(
seam,
{ autoAlpha: 0 },
{
autoAlpha: 1,
duration: Math.min(0.1 * scale, WHIP_DURATION),
ease: "power1.out",
immediateRender: false,
},
WHIP_AT,
);
tl.to(
seam,
{ autoAlpha: 0, duration: 0.15 * scale, ease: "power1.in" },
Math.max(WHIP_AT, WHIP_END - 0.15 * scale),
);
tl.call(
function () {
fireSfx("whip-cut", CUT_AT);
},
[],
CUT_AT,
);
// REST: dead still on scene B until the frame cuts.
// EXIT: only when the exit variable asks for one; exit none holds
// the landed scene (frame roots own transitions).
if (exit !== "none") {
tl.to(strip, { opacity: 0, duration: EXIT, ease: "power2.in" }, OUT_START);
if (exit === "up") {
tl.to(strip, { y: "-6cqh", duration: EXIT, 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 whip-pan-cut" item="whip-pan-cut" />
That writes one file: `compositions/components/whip-pan-cut.html`.
## Paste it into your composition
Open `compositions/components/whip-pan-cut.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 |
| --- | --- | --- | --- |
| `direction` | `left` | `left`, `right` | Shared travel direction for the outgoing and incoming scenes. |
| `whip_at` | `0.25` | 0s to 8s, step 0.05s | Seconds after mount start when the whip begins. |
| `accent` | `green` | `green`, `blue`, `violet` | Seam hairline and default after art tint. |
| `exit` | `none` | `none`, `fade`, `up` | Optional departure of the landed scene. Default none: it rests until the frame cuts. |
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="whip-pan-cut"
data-composition-src="compositions/components/whip-pan-cut.html"
data-variable-values='{"direction":"left","whip_at":0.25,"accent":"green","exit":"none"}'
></div>
```
## Source
<Accordion title={`whip-pan-cut.html`}>
```html
<!doctype html>
<!--
whip-pan-cut: HyperFrames video primitive (transitions / bridge)
Concept: the louder sibling of cut-the-curve. Scene A whips off laterally
with directional motion blur while scene B enters in the same direction at
matched velocity, on a speed-ramp profile (accelerate, fast middle,
decelerating catch). Two full-bleed content slots (the before-after-wipe
convention) with token-styled defaults.
Wave K, unit K6. Velocity matching is structural: both scenes ride ONE
strip (B docked one frame-width beyond A along the travel direction) and
the strip runs a single power3.inOut tween, so the seam velocity is exact
by construction and the profile is fast-middle with a decelerating catch.
Motion blur follows the motion-blur-streak recipe: a directional SVG
feGaussianBlur (stdDeviation "X 0", horizontal axis only) applied to the
mover (the strip carries both transform and filter; nothing else is
filtered, and there is no 3D on the strip for the filter to flatten). The
blur envelope is CAPPED at 16px and peaks exactly at mid-whip (peak
velocity), resolving to 0 at both ends: power3.in up over the first half,
power3.out down over the second, mirroring the strip's inOut velocity. The
proxy value is re-written on every seek via onUpdate and seeded at setup so
frame 0 renders sharp.
A hairline accent seam rides the boundary between the two scenes; it is
visible only while the whip runs, so it reads as the frame edge screaming
past rather than persistent chrome.
Slots (see README.md for a worked example):
- [data-slot="before"]: scene A, on stage at mount. Replace the children
of this element in your installed copy. Default: a muted token
wireframe.
- [data-slot="after"]: scene B, whipping in. Same mechanism. Default: a
brand-tinted version of the wireframe.
Direct img/video children of a slot are sized to cover the panel.
Variables (declared in data-composition-variables below):
- direction (left | right, default left): shared travel direction for
both scenes.
- whip_at (number, seconds, default 0.25): when the whip starts, relative
to mount start. Clamped so the whip always completes inside the clip.
- accent (green | blue | violet, default green): seam hairline and the
default after art tint. green maps to --brand, blue to --accent,
violet to --accent-2.
- exit (none | fade | up, default none): optional departure of the landed
scene B. Enabling it reserves a short tail window (min(0.35s, 25% of
D)) after B lands.
Envelope (transition profile, cut-the-curve precedent; the catch may still
be decelerating when a short clip window ends):
LEAD = whip_at (scene A rests, readable)
WHIP = 0.55s, power3.inOut, one frame-width of travel
REST = elastic remainder, dead still on B
EXIT = 0 when exit is none, else min(0.35s, 25% of D)
If D < LEAD + WHIP + EXIT, LEAD and WHIP scale down together.
Sync point: whip-cut at LEAD + WHIP/2 (peak velocity, 0.53s at defaults).
Sound cue: dispatches a bubbling `hf:sfx` CustomEvent with id "whip-cut"
at peak velocity. This primitive never plays audio.
Interruptible springs law (L1): the whip is a single owned tween on one
strip; a host redirect retargets the same transform channel and GSAP's
default overwrite preserves current velocity-position state at the
interruption frame (no snap-to-zero).
Mount contract: MOUNTABLE SUB-COMPOSITION. The runtime clones only
<template> contents; #root fills the host box (inset:0, container-type:
size), has no data-width/data-height, and registers one paused timeline
under the literal "whip-pan-cut" key (mount flattening strips
data-composition-id from the live root). Variables come from
window.__hyperframes.getVariables().
-->
<html
lang="en"
data-composition-id="whip-pan-cut"
data-composition-duration="1.2"
data-composition-variables='[
{ "id": "direction", "type": "enum", "role": "motion", "label": "Direction", "description": "Shared travel direction for the outgoing and incoming scenes.", "default": "left", "options": [{ "value": "left", "label": "Left" }, { "value": "right", "label": "Right" }] },
{ "id": "whip_at", "type": "number", "role": "timing", "label": "Whip start", "description": "Seconds after mount start when the whip begins.", "default": 0.25, "min": 0, "max": 8, "step": 0.05, "unit": "s" },
{ "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Seam hairline and default after art tint.", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
{ "id": "exit", "type": "enum", "role": "timing", "label": "Exit", "description": "Optional departure of the landed scene. Default none: it rests until the frame cuts.", "default": "none", "options": [{ "value": "none", "label": "None" }, { "value": "fade", "label": "Fade" }, { "value": "up", "label": "Up" }] }
]'
>
<head>
<meta charset="UTF-8" />
<title>Whip Pan Cut</title>
</head>
<body>
<template>
<div id="root" data-composition-id="whip-pan-cut" data-duration="1.2" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
/* Root fills the host-owned box. Internal measurements use cqw/cqh
and every painted color comes from a contract token. */
#root {
position: absolute;
inset: 0;
container-type: size;
isolation: isolate;
overflow: hidden;
background: var(--bg, #07111f);
color: var(--fg, #f8fafc);
font-family: var(--font-body, Inter, system-ui, sans-serif);
}
.wpc-clip,
.wpc-strip,
.wpc-panel,
.wpc-slot {
position: absolute;
inset: 0;
width: 100%;
height: 100%;
}
.wpc-clip {
overflow: hidden;
}
/* The strip is the ONE mover: it carries both scenes, the transform
tween, and the directional blur filter. No 3D lives on it, so the
filter has nothing to flatten. */
.wpc-strip {
filter: url("#wpc-blur");
will-change: transform, filter;
}
.wpc-panel {
overflow: hidden;
}
/* Scene B docks one frame-width beyond scene A along the travel
direction, so the pan crosses one continuous surface. */
#root[data-direction="left"] .wpc-after {
left: 100%;
}
#root[data-direction="right"] .wpc-after {
left: -100%;
}
/* The seam hairline rides the boundary between the two scenes and
is timeline-owned: visible only while the whip runs. */
.wpc-seam {
position: absolute;
z-index: 3;
top: 0;
bottom: 0;
width: 0.35cqw;
transform: translateX(-50%);
background: var(--wpc-accent, #22c55e);
pointer-events: none;
}
#root[data-direction="left"] .wpc-seam {
left: 100%;
}
#root[data-direction="right"] .wpc-seam {
left: 0;
}
/* Caller-supplied media covers its panel edge to edge. */
.wpc-slot > img,
.wpc-slot > video {
position: absolute;
inset: 0;
width: 100%;
height: 100%;
object-fit: cover;
}
/* Token-styled default slot content: a wireframe card that reads
muted on the before layer and brand-tinted on the after layer.
Callers replacing slot children never see any of this. */
.wpc-default {
position: absolute;
inset: 0;
display: grid;
place-items: center;
}
.wpc-before .wpc-default {
background:
linear-gradient(
color-mix(in srgb, var(--border, #334155) 34%, transparent) 0.12cqw,
transparent 0.12cqw
)
0 0 / 5cqw 5cqw,
linear-gradient(
90deg,
color-mix(in srgb, var(--border, #334155) 34%, transparent) 0.12cqw,
transparent 0.12cqw
)
0 0 / 5cqw 5cqw,
var(--surface, #172033);
}
.wpc-after .wpc-default {
background: linear-gradient(
135deg,
color-mix(in srgb, var(--brand, #22c55e) 32%, var(--surface, #172033)) 0%,
var(--surface, #172033) 58%,
color-mix(in srgb, var(--wpc-accent, #22c55e) 22%, var(--surface, #172033)) 100%
);
}
.wpc-card {
width: 56cqw;
height: 56cqh;
padding: var(--space-3, 4cqh) var(--space-3, 4cqw);
border: 0.16cqw solid var(--border, #334155);
border-radius: var(--radius, 2.4cqmin);
background: color-mix(in srgb, var(--surface, #172033) 88%, var(--bg, #07111f));
box-shadow: 0 2cqh 5cqw color-mix(in srgb, var(--bg, #07111f) 45%, transparent);
}
.wpc-after .wpc-card {
border-color: color-mix(
in srgb,
var(--wpc-accent, #22c55e) 52%,
var(--border, #334155)
);
background: color-mix(in srgb, var(--surface, #172033) 86%, var(--brand, #22c55e));
}
.wpc-bar {
width: 34%;
height: 4.4cqh;
margin-bottom: var(--space-3, 4cqh);
border-radius: 1.2cqh;
background: var(--muted, #94a3b8);
opacity: 0.5;
}
.wpc-after .wpc-bar {
background: var(--wpc-accent, #22c55e);
opacity: 0.92;
}
.wpc-line {
height: 2.4cqh;
margin-bottom: var(--space-2, 2.6cqh);
border-radius: 1.2cqh;
background: var(--muted, #94a3b8);
opacity: 0.4;
}
.wpc-line:nth-of-type(2) {
width: 92%;
}
.wpc-line:nth-of-type(3) {
width: 68%;
}
.wpc-line:nth-of-type(4) {
width: 44%;
}
.wpc-after .wpc-line {
background: color-mix(in srgb, var(--brand, #22c55e) 70%, var(--fg, #f8fafc));
opacity: 0.75;
}
</style>
<div
id="whip-pan-cut-clip"
class="wpc-clip clip"
data-start="0"
data-duration="1.2"
data-track-index="0"
>
<svg width="0" height="0" aria-hidden="true" style="position: absolute">
<defs>
<filter id="wpc-blur" x="-50%" y="-20%" width="200%" height="140%">
<feGaussianBlur class="wpc-blur-node" in="SourceGraphic" stdDeviation="0 0" />
</filter>
</defs>
</svg>
<div class="wpc-strip">
<section class="wpc-panel wpc-before" aria-label="Outgoing scene">
<div class="wpc-slot" data-slot="before">
<!-- SLOT "before": replace the children of this element with
your own content (img, video, or HTML). -->
<div class="wpc-default" aria-hidden="true">
<div class="wpc-card">
<div class="wpc-bar"></div>
<div class="wpc-line"></div>
<div class="wpc-line"></div>
<div class="wpc-line"></div>
</div>
</div>
</div>
</section>
<section class="wpc-panel wpc-after" aria-label="Incoming scene">
<div class="wpc-slot" data-slot="after">
<!-- SLOT "after": replace the children of this element with
your own content (img, video, or HTML). -->
<div class="wpc-default" aria-hidden="true">
<div class="wpc-card">
<div class="wpc-bar"></div>
<div class="wpc-line"></div>
<div class="wpc-line"></div>
<div class="wpc-line"></div>
</div>
</div>
</div>
</section>
<div class="wpc-seam" aria-hidden="true"></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");
// Literal id: mount flattening strips data-composition-id from the
// live root before this timeline registers.
var compositionId = "whip-pan-cut";
var strip = root.querySelector(".wpc-strip");
var seam = root.querySelector(".wpc-seam");
var blurNode = root.querySelector(".wpc-blur-node");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var direction = vars.direction === "right" ? "right" : "left";
var rawWhipAt = vars.whip_at == null ? 0.25 : Number(vars.whip_at);
var whipAt = Number.isFinite(rawWhipAt) ? Math.max(0, Math.min(8, rawWhipAt)) : 0.25;
// Each enum choice routes to a DIFFERENT contract token so the
// variable stays meaningful under a theme.
var accentColors = {
green: "var(--brand, #22c55e)",
blue: "var(--accent, #38bdf8)",
violet: "var(--accent-2, #c5a3ff)",
};
var accent = Object.prototype.hasOwnProperty.call(accentColors, vars.accent)
? vars.accent
: "green";
// The bundler mirrors composition variables as scoped CSS custom
// props, so this unit's own accent variable can shadow the
// contract --accent token inside the subtree ("blue" is a valid
// CSS color and would render pure blue). When the shadow is
// present, fall back to the literal contract value.
var computedAccent = getComputedStyle(root).getPropertyValue("--accent").trim();
if (
computedAccent === "green" ||
computedAccent === "blue" ||
computedAccent === "violet"
) {
accentColors.blue = "#38bdf8";
}
// INVARIANT: only none | fade | up reaches the timeline.
var exit = vars.exit === "fade" || vars.exit === "up" ? vars.exit : "none";
root.dataset.direction = direction;
root.style.setProperty("--wpc-accent", accentColors[accent]);
// Travel measured in px ONCE at mount (cq units inside tweened
// transform values are a seek trap). One frame-width lands scene
// B exactly where scene A stood.
var travel = root.clientWidth || 1920;
var sign = direction === "left" ? -1 : 1;
// RETIME RANGE: 0.6s to 3s. LEAD and WHIP scale together only when
// D is too short. REST absorbs any remainder; this is a transition
// profile (cut-the-curve precedent), so a short clip window may
// end while the catch is still decelerating. Never timeScale().
var WHIP_DURATION_BASE = 0.55;
var duration = Math.max(0.001, parseFloat(root.dataset.duration || "1.2"));
var EXIT = exit === "none" ? 0 : Math.min(0.35, duration * 0.25);
var scale =
duration - EXIT < whipAt + WHIP_DURATION_BASE
? (duration - EXIT) / (whipAt + WHIP_DURATION_BASE)
: 1;
var WHIP_AT = whipAt * scale;
var WHIP_DURATION = WHIP_DURATION_BASE * scale;
var WHIP_END = WHIP_AT + WHIP_DURATION;
var CUT_AT = WHIP_AT + WHIP_DURATION / 2;
var OUT_START = duration - EXIT;
// Blur cap per the motion-blur-streak recipe: peak stdDeviation
// stays well under the 30px readability ceiling.
var PEAK_BLUR = 16;
var blurProxy = { v: 0 };
function writeBlur() {
blurNode.setAttribute("stdDeviation", blurProxy.v + " 0");
}
// Seed frame 0 so a seek to t=0 renders sharp, not a stale blur.
writeBlur();
function fireSfx(id, t) {
root.dispatchEvent(
new CustomEvent("hf:sfx", { detail: { id: id, t: t }, bubbles: true }),
);
}
// Explicit both-endpoints state makes tl.seek(0) deterministic.
gsap.set(strip, { x: 0, y: 0, opacity: 1 });
gsap.set(seam, { autoAlpha: 0 });
var tl = gsap.timeline({ paused: true });
// WHIP: one strip, one speed-ramp tween. Both scenes share the
// transform, so seam velocity is matched by construction.
tl.fromTo(
strip,
{ x: 0 },
{ x: sign * travel, duration: WHIP_DURATION, ease: "power3.inOut" },
WHIP_AT,
);
// Blur envelope: peaks at mid-whip (peak velocity), zero at both
// ends. power3.in up / power3.out down mirrors the inOut ramp.
tl.to(
blurProxy,
{ v: PEAK_BLUR, duration: WHIP_DURATION / 2, ease: "power3.in", onUpdate: writeBlur },
WHIP_AT,
);
tl.to(
blurProxy,
{ v: 0, duration: WHIP_DURATION / 2, ease: "power3.out", onUpdate: writeBlur },
WHIP_AT + WHIP_DURATION / 2,
);
// Seam hairline: alive only while the whip runs.
tl.fromTo(
seam,
{ autoAlpha: 0 },
{
autoAlpha: 1,
duration: Math.min(0.1 * scale, WHIP_DURATION),
ease: "power1.out",
immediateRender: false,
},
WHIP_AT,
);
tl.to(
seam,
{ autoAlpha: 0, duration: 0.15 * scale, ease: "power1.in" },
Math.max(WHIP_AT, WHIP_END - 0.15 * scale),
);
tl.call(
function () {
fireSfx("whip-cut", CUT_AT);
},
[],
CUT_AT,
);
// REST: dead still on scene B until the frame cuts.
// EXIT: only when the exit variable asks for one; exit none holds
// the landed scene (frame roots own transitions).
if (exit !== "none") {
tl.to(strip, { opacity: 0, duration: EXIT, ease: "power2.in" }, OUT_START);
if (exit === "up") {
tl.to(strip, { y: "-6cqh", duration: EXIT, 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 `transition` `whip-pan` `motion-blur` `velocity-match` `speed-ramp` `bridge` `slots`.
## 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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