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hyperframes/docs/catalog/components/cut-the-curve.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: "Cut the Curve"
description: "A velocity-matched directional hard cut: the outgoing subject accelerates with power4.in, swaps at peak velocity, and the incoming subject continues in the same direction with power4.out."
---
import { InstallCommand } from "/snippets/install-command.jsx";
import { VariablesExplorer } from "/snippets/variables-explorer.jsx";
<VariablesExplorer
previewSrc="/public/catalog/components/cut-the-curve.json"
compositionId="cut-the-curve"
compositionSrc="compositions/components/cut-the-curve.html"
variables={[{"id":"subject","type":"enum","role":"content","label":"Subject","description":"Visual payload used on both sides of the cut.","default":"cursor","options":[{"value":"cursor","label":"Cursor"},{"value":"card","label":"Card"},{"value":"scene","label":"Scene"}]},{"id":"direction","type":"enum","role":"motion","label":"Direction","description":"Shared screen direction for outgoing and incoming travel.","default":"left","options":[{"value":"left","label":"Left"},{"value":"right","label":"Right"},{"value":"up","label":"Up"},{"value":"down","label":"Down"}]},{"id":"cutFraction","type":"number","role":"timing","label":"Cut fraction","description":"Normalized point where the hard cut swaps subjects.","default":0.33,"min":0,"max":1,"step":0.01},{"id":"blurPx","type":"number","role":"style","label":"Cut blur","description":"Blur in pixels shared by both subjects at the cut seam.","default":12,"min":0,"max":40,"step":1,"unit":"px"},{"id":"exit","type":"enum","role":"timing","label":"Exit","description":"Optional departure of the incoming subject. Default none: it rests until the frame cuts.","default":"none","options":[{"value":"none","label":"None"},{"value":"fade","label":"Fade"},{"value":"up","label":"Up"}]}]}
>
```html cut-the-curve.html
<!doctype html>
<!--
cut-the-curve -- HyperFrames video primitive (transitions / bridge)
Concept: a velocity-matched directional hard cut. The outgoing subject
accelerates along one straight screen vector with power4.in. At peak
velocity, the timeline swaps identities. The incoming subject starts on
the far side of the same vector and decelerates to rest with power4.out.
Matched blur and opacity at the cut conceal the seam.
Compiled from the launch write-up for this piece.
The source identifies the production signature as a single power4 whip,
with an approximately 1:2 outgoing-to-incoming distance and duration split.
Use when: bridging attention and momentum between shots, UI states, cards,
cursor beats, or scene blocks without requiring object identity to persist.
Variables (declared in data-composition-variables below):
- subject ("cursor" | "card" | "scene", default "cursor") selects the
simple visual payload used for both sides of the cut.
- direction ("left" | "right" | "up" | "down", default "left") owns
both the motion axis and the shared screen direction.
- cutFraction (number, 0-1, default 0.33) sets the hard-cut point. The
incoming distance is derived from this fraction so seam velocity stays
matched. At 0 or 1, the corresponding zero-duration half collapses.
- blurPx (number, default 12) sets blur at the cut seam.
- exit ("none" | "fade" | "up", default "none") optionally departs the
incoming subject at the end. Enabling it reserves a short tail window
(min(0.35s, 25% of D)) after the incoming subject lands.
Envelope (transition profile, no elastic HOLD; T = D minus the exit tail,
which is 0 when exit is none):
OUT = T * cutFraction, power4.in
IN = T * (1 - cutFraction), power4.out
The default 0.33 split is approximately 1:2 in time. Incoming distance is
derived from OUT distance and the duration ratio, preserving the same
approximately 1:2 spatial split and matching velocity at the cut.
Sync point: CUT_AT = T * cutFraction, the fixed boundary between OUT and
IN. It never lands in a HOLD because this profile has no HOLD phase.
Sound cue: a short whip cut fires at CUT_AT. The primitive never plays
audio. It dispatches an `hf:sfx` CustomEvent with
{ id: "whip-cut", t: CUT_AT } for the scene mix stage to route.
EDIT ZONE: change only the subject geometry custom properties in the style
block when adapting the payload drawings. The vector ratios and the paired
power4 eases are the mechanic and must remain together.
INVARIANTS: outgoing and incoming always share one vector; the identity swap
happens only at CUT_AT; their blur and opacity values match at that seam;
exactly one paused timeline registers under the literal id "cut-the-curve".
RETIME RANGE: 0.3s to 3s. Retiming changes D only. Never timeScale the GSAP
timeline and never split the two halves into independently tuned velocities.
Mount contract: this is a template-wrapped sub-composition. Everything the
mount needs, including styles, markup, GSAP, and timeline registration,
lives inside <template>. #root fills the host box with position:absolute,
inset:0, and container-type:size. It has no data-width or data-height.
-->
<html
lang="en"
data-composition-variables='[
{ "id": "subject", "type": "enum", "role": "content", "label": "Subject", "description": "Visual payload used on both sides of the cut.", "default": "cursor", "options": [{ "value": "cursor", "label": "Cursor" }, { "value": "card", "label": "Card" }, { "value": "scene", "label": "Scene" }] },
{ "id": "direction", "type": "enum", "role": "motion", "label": "Direction", "description": "Shared screen direction for outgoing and incoming travel.", "default": "left", "options": [{ "value": "left", "label": "Left" }, { "value": "right", "label": "Right" }, { "value": "up", "label": "Up" }, { "value": "down", "label": "Down" }] },
{ "id": "cutFraction", "type": "number", "role": "timing", "label": "Cut fraction", "description": "Normalized point where the hard cut swaps subjects.", "default": 0.33, "min": 0, "max": 1, "step": 0.01 },
{ "id": "blurPx", "type": "number", "role": "style", "label": "Cut blur", "description": "Blur in pixels shared by both subjects at the cut seam.", "default": 12, "min": 0, "max": 40, "step": 1, "unit": "px" },
{ "id": "exit", "type": "enum", "role": "timing", "label": "Exit", "description": "Optional departure of the incoming subject. 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>Cut the Curve</title>
</head>
<body>
<template>
<div id="root" data-composition-id="cut-the-curve" data-duration="1" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
#root {
position: absolute;
inset: 0;
container-type: size;
isolation: isolate;
overflow: hidden;
color: var(--fg, #f8fafc);
font-family: var(--font-body, Inter, system-ui, sans-serif);
}
.ctc-clip,
.ctc-backdrop,
.ctc-subject {
position: absolute;
inset: 0;
}
.ctc-clip {
overflow: hidden;
}
.ctc-backdrop {
background:
radial-gradient(
circle at var(--ctc-glow-x, 24%) var(--ctc-glow-y, 28%),
color-mix(
in srgb,
var(--fg, #f8fafc) var(--ctc-glow-strength, 18%),
var(--transparent, transparent)
),
var(--transparent, transparent) var(--ctc-glow-radius, 42%)
),
var(--bg, #0b1120);
}
.ctc-subject {
display: grid;
place-items: center;
opacity: 0;
will-change: transform, filter, opacity;
}
.ctc-subject.is-outgoing {
opacity: 1;
--ctc-primary: color-mix(in srgb, var(--fg, #f8fafc) 45%, transparent);
--ctc-secondary: color-mix(in srgb, var(--fg, #f8fafc) 18%, transparent);
}
.ctc-subject.is-incoming {
--ctc-primary: color-mix(in srgb, var(--fg, #f8fafc) 72%, transparent);
--ctc-secondary: color-mix(in srgb, var(--fg, #f8fafc) 45%, transparent);
}
.ctc-art {
display: none;
}
#root[data-subject="cursor"] .ctc-cursor,
#root[data-subject="card"] .ctc-card,
#root[data-subject="scene"] .ctc-scene {
display: block;
}
.ctc-cursor {
position: relative;
width: var(--ctc-cursor-width, 15cqw);
height: var(--ctc-cursor-height, 24cqh);
}
.ctc-cursor svg {
width: var(--ctc-cursor-svg-width, 100%);
height: var(--ctc-cursor-svg-height, 100%);
overflow: visible;
filter: drop-shadow(
var(--ctc-shadow-x, 0cqw) var(--ctc-shadow-y, 1cqh) var(--ctc-shadow-blur, 1.6cqw)
color-mix(
in srgb,
var(--bg, #0b1120) var(--ctc-shadow-strength, 65%),
var(--transparent, transparent)
)
);
}
.ctc-cursor-shape {
fill: var(--ctc-primary, var(--fg, #f8fafc));
stroke: var(--fg, #f8fafc);
stroke-width: var(--ctc-cursor-stroke, 1.8);
stroke-linejoin: round;
}
.ctc-cursor-pulse {
position: absolute;
left: var(--ctc-pulse-left, -5cqw);
top: var(--ctc-pulse-top, -5cqh);
width: var(--ctc-pulse-size, 11cqw);
aspect-ratio: var(--ctc-pulse-ratio, 1);
border: var(--ctc-pulse-border, 0.25cqw) solid
color-mix(
in srgb,
var(--ctc-secondary, var(--fg, #f8fafc)) var(--ctc-pulse-strength, 58%),
var(--transparent, transparent)
);
border-radius: var(--ctc-round, 50%);
}
.ctc-card {
width: var(--ctc-card-width, 42cqw);
min-height: var(--ctc-card-height, 34cqh);
padding: var(--ctc-card-padding-y, var(--space-3, 4.5cqh))
var(--ctc-card-padding-x, var(--space-3, 4cqw));
border: var(--ctc-border-width, 0.22cqw) solid var(--border, #334155);
border-radius: var(--radius, 2cqw);
background: var(--surface, #1e293b);
box-shadow: var(--ctc-shadow-x, 0cqw) var(--ctc-card-shadow-y, 2.4cqh)
var(--ctc-card-shadow-blur, 5cqw)
color-mix(
in srgb,
var(--bg, #0b1120) var(--ctc-card-shadow-strength, 55%),
var(--transparent, transparent)
);
}
.ctc-card-chip {
width: var(--ctc-chip-width, 9cqw);
height: var(--ctc-chip-height, 2.2cqh);
border-radius: var(--ctc-pill-radius, 99cqw);
background: var(--ctc-primary, var(--fg, #f8fafc));
margin-bottom: var(--ctc-card-gap, var(--space-3, 3.2cqh));
}
.ctc-card-line,
.ctc-scene-line {
height: var(--ctc-line-height, 1.8cqh);
border-radius: var(--ctc-pill-radius, 99cqw);
background: var(--fg, #f8fafc);
}
.ctc-card-line + .ctc-card-line {
margin-top: var(--ctc-line-gap, var(--space-2, 2.2cqh));
}
.ctc-card-line:first-of-type {
width: var(--ctc-line-long, 88%);
}
.ctc-card-line:last-of-type {
width: var(--ctc-line-short, 58%);
opacity: var(--ctc-muted-opacity, 0.42);
}
.ctc-scene {
width: var(--ctc-scene-width, 68cqw);
height: var(--ctc-scene-height, 58cqh);
overflow: hidden;
border: var(--ctc-border-width, 0.22cqw) solid var(--border, #334155);
border-radius: var(--radius, 2cqw);
background: var(--surface, #1e293b);
box-shadow: var(--ctc-shadow-x, 0cqw) var(--ctc-card-shadow-y, 2.4cqh)
var(--ctc-card-shadow-blur, 5cqw)
color-mix(
in srgb,
var(--bg, #0b1120) var(--ctc-card-shadow-strength, 55%),
var(--transparent, transparent)
);
}
.ctc-scene-bar {
display: flex;
align-items: center;
gap: var(--ctc-dot-gap, var(--space-1, 1cqw));
height: var(--ctc-scene-bar-height, 8cqh);
padding-inline: var(--ctc-scene-pad, var(--space-2, 2cqw));
border-bottom: var(--ctc-border-width, 0.22cqw) solid var(--border, #334155);
}
.ctc-scene-dot {
width: var(--ctc-dot-size, 1.4cqw);
aspect-ratio: var(--ctc-pulse-ratio, 1);
border-radius: var(--ctc-round, 50%);
background: var(--ctc-primary, var(--fg, #f8fafc));
}
.ctc-scene-body {
display: grid;
grid-template-columns: var(--ctc-scene-columns, 1fr 2fr);
gap: var(--ctc-scene-gap, var(--space-3, 3cqw));
padding: var(--ctc-scene-body-pad, var(--space-3, 5cqh))
var(--ctc-scene-pad, var(--space-3, 3cqw));
}
.ctc-scene-panel {
min-height: var(--ctc-panel-height, 34cqh);
border-radius: var(--ctc-panel-radius, var(--radius, 1.2cqw));
background: color-mix(
in srgb,
var(--ctc-primary, var(--fg, #f8fafc)) var(--ctc-panel-strength, 24%),
var(--surface, #1e293b)
);
}
.ctc-scene-copy {
padding-top: var(--ctc-copy-top, var(--space-2, 2cqh));
}
.ctc-scene-line + .ctc-scene-line {
margin-top: var(--ctc-scene-line-gap, var(--space-3, 3cqh));
}
.ctc-scene-line:nth-child(1) {
width: var(--ctc-scene-line-one, 92%);
}
.ctc-scene-line:nth-child(2) {
width: var(--ctc-scene-line-two, 68%);
opacity: var(--ctc-muted-opacity, 0.42);
}
.ctc-scene-line:nth-child(3) {
width: var(--ctc-scene-line-three, 78%);
background: var(--ctc-secondary, var(--fg, #f8fafc));
}
</style>
<div
id="cut-the-curve-clip"
class="ctc-clip clip"
data-start="0"
data-duration="1"
data-track-index="0"
>
<div class="ctc-backdrop"></div>
<div class="ctc-subject is-outgoing" aria-hidden="true">
<div class="ctc-art ctc-cursor">
<span class="ctc-cursor-pulse"></span>
<svg viewBox="0 0 64 88" aria-hidden="true">
<path
class="ctc-cursor-shape"
d="M8 5 L54 43 L34 47 L45 75 L30 82 L19 53 L8 68 Z"
/>
</svg>
</div>
<div class="ctc-art ctc-card">
<div class="ctc-card-chip"></div>
<div class="ctc-card-line"></div>
<div class="ctc-card-line"></div>
</div>
<div class="ctc-art ctc-scene">
<div class="ctc-scene-bar">
<span class="ctc-scene-dot"></span><span class="ctc-scene-dot"></span
><span class="ctc-scene-dot"></span>
</div>
<div class="ctc-scene-body">
<div class="ctc-scene-panel"></div>
<div class="ctc-scene-copy">
<div class="ctc-scene-line"></div>
<div class="ctc-scene-line"></div>
<div class="ctc-scene-line"></div>
</div>
</div>
</div>
</div>
<div class="ctc-subject is-incoming" aria-hidden="true">
<div class="ctc-art ctc-cursor">
<span class="ctc-cursor-pulse"></span>
<svg viewBox="0 0 64 88" aria-hidden="true">
<path
class="ctc-cursor-shape"
d="M8 5 L54 43 L34 47 L45 75 L30 82 L19 53 L8 68 Z"
/>
</svg>
</div>
<div class="ctc-art ctc-card">
<div class="ctc-card-chip"></div>
<div class="ctc-card-line"></div>
<div class="ctc-card-line"></div>
</div>
<div class="ctc-art ctc-scene">
<div class="ctc-scene-bar">
<span class="ctc-scene-dot"></span><span class="ctc-scene-dot"></span
><span class="ctc-scene-dot"></span>
</div>
<div class="ctc-scene-body">
<div class="ctc-scene-panel"></div>
<div class="ctc-scene-copy">
<div class="ctc-scene-line"></div>
<div class="ctc-scene-line"></div>
<div class="ctc-scene-line"></div>
</div>
</div>
</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 outgoing = root.querySelector(".is-outgoing");
var incoming = root.querySelector(".is-incoming");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var subject =
vars.subject === "card" || vars.subject === "scene" ? vars.subject : "cursor";
var direction =
vars.direction === "right" || vars.direction === "up" || vars.direction === "down"
? vars.direction
: "left";
var rawCut = Number(vars.cutFraction);
var cutFraction = Number.isFinite(rawCut) ? Math.max(0, Math.min(1, rawCut)) : 0.33;
var rawBlur = Number(vars.blurPx);
var blurPx = Number.isFinite(rawBlur) ? Math.max(0, rawBlur) : 12;
var exit = vars.exit === "fade" || vars.exit === "up" ? vars.exit : "none";
root.dataset.subject = subject;
// Direction is the single owner of axis, sign, unit, and base travel.
var vectors = {
left: { axis: "x", sign: -1, unit: "cqw", distance: 34 },
right: { axis: "x", sign: 1, unit: "cqw", distance: 34 },
up: { axis: "y", sign: -1, unit: "cqh", distance: 26 },
down: { axis: "y", sign: 1, unit: "cqh", distance: 26 },
};
var vector = vectors[direction];
var duration = Math.max(0.001, parseFloat(root.dataset.duration || "1"));
// Exit none keeps the whole duration for the cut profile. An
// enabled exit reserves a short tail after the incoming lands.
var EXIT = exit === "none" ? 0 : Math.min(0.35, duration * 0.25);
var TRAVEL = Math.max(0.001, duration - EXIT);
var CUT_AT = TRAVEL * cutFraction;
var ENTRY_DURATION = TRAVEL - CUT_AT;
var entryDistance =
CUT_AT > 0 ? vector.distance * (ENTRY_DURATION / CUT_AT) : vector.distance * 2;
var seamBlur = "blur(" + blurPx + "px)";
var clearBlur = "blur(0px)";
var seamOpacity = 0.72;
var outgoingEnd = { opacity: seamOpacity, filter: seamBlur };
outgoingEnd[vector.axis] = vector.sign * vector.distance + vector.unit;
var incomingStart = { x: 0, y: 0, opacity: 0, filter: seamBlur };
incomingStart[vector.axis] = -vector.sign * entryDistance + vector.unit;
var incomingEnd = { opacity: 1, filter: clearBlur };
incomingEnd[vector.axis] = 0;
gsap.set(outgoing, { x: 0, y: 0, opacity: 1, filter: clearBlur });
gsap.set(incoming, incomingStart);
var tl = gsap.timeline({ paused: true });
if (CUT_AT > 0) {
tl.to(
outgoing,
Object.assign({}, outgoingEnd, { duration: CUT_AT, ease: "power4.in" }),
0,
);
}
// CUT: one visibility owner, matched blur and opacity on both sides.
tl.set(outgoing, { opacity: 0 }, CUT_AT);
tl.set(incoming, { opacity: seamOpacity }, CUT_AT);
tl.call(
function () {
root.dispatchEvent(
new CustomEvent("hf:sfx", {
detail: { id: "whip-cut", t: CUT_AT },
bubbles: true,
}),
);
},
[],
CUT_AT,
);
if (ENTRY_DURATION > 0) {
tl.to(
incoming,
Object.assign({}, incomingEnd, {
duration: ENTRY_DURATION,
ease: "power4.out",
}),
CUT_AT,
);
} else {
tl.set(incoming, incomingEnd, CUT_AT);
}
// Optional departure; exit none rests until the frame cuts.
if (exit === "fade") {
tl.to(incoming, { opacity: 0, duration: EXIT, ease: "power2.in" }, TRAVEL);
} else if (exit === "up") {
tl.to(
incoming,
{ opacity: 0, y: "-6cqh", duration: EXIT, ease: "power2.in" },
TRAVEL,
);
}
tl.seek(0);
window.__timelines = window.__timelines || {};
window.__timelines["cut-the-curve"] = tl;
})();
</script>
</div>
</template>
</body>
</html>
```
</VariablesExplorer>
## Install
<InstallCommand command="npx hyperframes add cut-the-curve" item="cut-the-curve" />
That writes one file: `compositions/components/cut-the-curve.html`.
## Paste it into your composition
Open `compositions/components/cut-the-curve.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 |
| --- | --- | --- | --- |
| `subject` | `cursor` | `cursor`, `card`, `scene` | Visual payload used on both sides of the cut. |
| `direction` | `left` | `left`, `right`, `up`, `down` | Shared screen direction for outgoing and incoming travel. |
| `cutFraction` | `0.33` | 0 to 1, step 0.01 | Normalized point where the hard cut swaps subjects. |
| `blurPx` | `12` | 0px to 40px, step 1px | Blur in pixels shared by both subjects at the cut seam. |
| `exit` | `none` | `none`, `fade`, `up` | Optional departure of the incoming subject. 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="cut-the-curve"
data-composition-src="compositions/components/cut-the-curve.html"
data-variable-values='{"subject":"cursor","direction":"left","cutFraction":0.33,"blurPx":12,"exit":"none"}'
></div>
```
## Source
<Accordion title={`cut-the-curve.html`}>
```html
<!doctype html>
<!--
cut-the-curve -- HyperFrames video primitive (transitions / bridge)
Concept: a velocity-matched directional hard cut. The outgoing subject
accelerates along one straight screen vector with power4.in. At peak
velocity, the timeline swaps identities. The incoming subject starts on
the far side of the same vector and decelerates to rest with power4.out.
Matched blur and opacity at the cut conceal the seam.
Compiled from the launch write-up for this piece.
The source identifies the production signature as a single power4 whip,
with an approximately 1:2 outgoing-to-incoming distance and duration split.
Use when: bridging attention and momentum between shots, UI states, cards,
cursor beats, or scene blocks without requiring object identity to persist.
Variables (declared in data-composition-variables below):
- subject ("cursor" | "card" | "scene", default "cursor") selects the
simple visual payload used for both sides of the cut.
- direction ("left" | "right" | "up" | "down", default "left") owns
both the motion axis and the shared screen direction.
- cutFraction (number, 0-1, default 0.33) sets the hard-cut point. The
incoming distance is derived from this fraction so seam velocity stays
matched. At 0 or 1, the corresponding zero-duration half collapses.
- blurPx (number, default 12) sets blur at the cut seam.
- exit ("none" | "fade" | "up", default "none") optionally departs the
incoming subject at the end. Enabling it reserves a short tail window
(min(0.35s, 25% of D)) after the incoming subject lands.
Envelope (transition profile, no elastic HOLD; T = D minus the exit tail,
which is 0 when exit is none):
OUT = T * cutFraction, power4.in
IN = T * (1 - cutFraction), power4.out
The default 0.33 split is approximately 1:2 in time. Incoming distance is
derived from OUT distance and the duration ratio, preserving the same
approximately 1:2 spatial split and matching velocity at the cut.
Sync point: CUT_AT = T * cutFraction, the fixed boundary between OUT and
IN. It never lands in a HOLD because this profile has no HOLD phase.
Sound cue: a short whip cut fires at CUT_AT. The primitive never plays
audio. It dispatches an `hf:sfx` CustomEvent with
{ id: "whip-cut", t: CUT_AT } for the scene mix stage to route.
EDIT ZONE: change only the subject geometry custom properties in the style
block when adapting the payload drawings. The vector ratios and the paired
power4 eases are the mechanic and must remain together.
INVARIANTS: outgoing and incoming always share one vector; the identity swap
happens only at CUT_AT; their blur and opacity values match at that seam;
exactly one paused timeline registers under the literal id "cut-the-curve".
RETIME RANGE: 0.3s to 3s. Retiming changes D only. Never timeScale the GSAP
timeline and never split the two halves into independently tuned velocities.
Mount contract: this is a template-wrapped sub-composition. Everything the
mount needs, including styles, markup, GSAP, and timeline registration,
lives inside <template>. #root fills the host box with position:absolute,
inset:0, and container-type:size. It has no data-width or data-height.
-->
<html
lang="en"
data-composition-variables='[
{ "id": "subject", "type": "enum", "role": "content", "label": "Subject", "description": "Visual payload used on both sides of the cut.", "default": "cursor", "options": [{ "value": "cursor", "label": "Cursor" }, { "value": "card", "label": "Card" }, { "value": "scene", "label": "Scene" }] },
{ "id": "direction", "type": "enum", "role": "motion", "label": "Direction", "description": "Shared screen direction for outgoing and incoming travel.", "default": "left", "options": [{ "value": "left", "label": "Left" }, { "value": "right", "label": "Right" }, { "value": "up", "label": "Up" }, { "value": "down", "label": "Down" }] },
{ "id": "cutFraction", "type": "number", "role": "timing", "label": "Cut fraction", "description": "Normalized point where the hard cut swaps subjects.", "default": 0.33, "min": 0, "max": 1, "step": 0.01 },
{ "id": "blurPx", "type": "number", "role": "style", "label": "Cut blur", "description": "Blur in pixels shared by both subjects at the cut seam.", "default": 12, "min": 0, "max": 40, "step": 1, "unit": "px" },
{ "id": "exit", "type": "enum", "role": "timing", "label": "Exit", "description": "Optional departure of the incoming subject. 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>Cut the Curve</title>
</head>
<body>
<template>
<div id="root" data-composition-id="cut-the-curve" data-duration="1" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
#root {
position: absolute;
inset: 0;
container-type: size;
isolation: isolate;
overflow: hidden;
color: var(--fg, #f8fafc);
font-family: var(--font-body, Inter, system-ui, sans-serif);
}
.ctc-clip,
.ctc-backdrop,
.ctc-subject {
position: absolute;
inset: 0;
}
.ctc-clip {
overflow: hidden;
}
.ctc-backdrop {
background:
radial-gradient(
circle at var(--ctc-glow-x, 24%) var(--ctc-glow-y, 28%),
color-mix(
in srgb,
var(--fg, #f8fafc) var(--ctc-glow-strength, 18%),
var(--transparent, transparent)
),
var(--transparent, transparent) var(--ctc-glow-radius, 42%)
),
var(--bg, #0b1120);
}
.ctc-subject {
display: grid;
place-items: center;
opacity: 0;
will-change: transform, filter, opacity;
}
.ctc-subject.is-outgoing {
opacity: 1;
--ctc-primary: color-mix(in srgb, var(--fg, #f8fafc) 45%, transparent);
--ctc-secondary: color-mix(in srgb, var(--fg, #f8fafc) 18%, transparent);
}
.ctc-subject.is-incoming {
--ctc-primary: color-mix(in srgb, var(--fg, #f8fafc) 72%, transparent);
--ctc-secondary: color-mix(in srgb, var(--fg, #f8fafc) 45%, transparent);
}
.ctc-art {
display: none;
}
#root[data-subject="cursor"] .ctc-cursor,
#root[data-subject="card"] .ctc-card,
#root[data-subject="scene"] .ctc-scene {
display: block;
}
.ctc-cursor {
position: relative;
width: var(--ctc-cursor-width, 15cqw);
height: var(--ctc-cursor-height, 24cqh);
}
.ctc-cursor svg {
width: var(--ctc-cursor-svg-width, 100%);
height: var(--ctc-cursor-svg-height, 100%);
overflow: visible;
filter: drop-shadow(
var(--ctc-shadow-x, 0cqw) var(--ctc-shadow-y, 1cqh) var(--ctc-shadow-blur, 1.6cqw)
color-mix(
in srgb,
var(--bg, #0b1120) var(--ctc-shadow-strength, 65%),
var(--transparent, transparent)
)
);
}
.ctc-cursor-shape {
fill: var(--ctc-primary, var(--fg, #f8fafc));
stroke: var(--fg, #f8fafc);
stroke-width: var(--ctc-cursor-stroke, 1.8);
stroke-linejoin: round;
}
.ctc-cursor-pulse {
position: absolute;
left: var(--ctc-pulse-left, -5cqw);
top: var(--ctc-pulse-top, -5cqh);
width: var(--ctc-pulse-size, 11cqw);
aspect-ratio: var(--ctc-pulse-ratio, 1);
border: var(--ctc-pulse-border, 0.25cqw) solid
color-mix(
in srgb,
var(--ctc-secondary, var(--fg, #f8fafc)) var(--ctc-pulse-strength, 58%),
var(--transparent, transparent)
);
border-radius: var(--ctc-round, 50%);
}
.ctc-card {
width: var(--ctc-card-width, 42cqw);
min-height: var(--ctc-card-height, 34cqh);
padding: var(--ctc-card-padding-y, var(--space-3, 4.5cqh))
var(--ctc-card-padding-x, var(--space-3, 4cqw));
border: var(--ctc-border-width, 0.22cqw) solid var(--border, #334155);
border-radius: var(--radius, 2cqw);
background: var(--surface, #1e293b);
box-shadow: var(--ctc-shadow-x, 0cqw) var(--ctc-card-shadow-y, 2.4cqh)
var(--ctc-card-shadow-blur, 5cqw)
color-mix(
in srgb,
var(--bg, #0b1120) var(--ctc-card-shadow-strength, 55%),
var(--transparent, transparent)
);
}
.ctc-card-chip {
width: var(--ctc-chip-width, 9cqw);
height: var(--ctc-chip-height, 2.2cqh);
border-radius: var(--ctc-pill-radius, 99cqw);
background: var(--ctc-primary, var(--fg, #f8fafc));
margin-bottom: var(--ctc-card-gap, var(--space-3, 3.2cqh));
}
.ctc-card-line,
.ctc-scene-line {
height: var(--ctc-line-height, 1.8cqh);
border-radius: var(--ctc-pill-radius, 99cqw);
background: var(--fg, #f8fafc);
}
.ctc-card-line + .ctc-card-line {
margin-top: var(--ctc-line-gap, var(--space-2, 2.2cqh));
}
.ctc-card-line:first-of-type {
width: var(--ctc-line-long, 88%);
}
.ctc-card-line:last-of-type {
width: var(--ctc-line-short, 58%);
opacity: var(--ctc-muted-opacity, 0.42);
}
.ctc-scene {
width: var(--ctc-scene-width, 68cqw);
height: var(--ctc-scene-height, 58cqh);
overflow: hidden;
border: var(--ctc-border-width, 0.22cqw) solid var(--border, #334155);
border-radius: var(--radius, 2cqw);
background: var(--surface, #1e293b);
box-shadow: var(--ctc-shadow-x, 0cqw) var(--ctc-card-shadow-y, 2.4cqh)
var(--ctc-card-shadow-blur, 5cqw)
color-mix(
in srgb,
var(--bg, #0b1120) var(--ctc-card-shadow-strength, 55%),
var(--transparent, transparent)
);
}
.ctc-scene-bar {
display: flex;
align-items: center;
gap: var(--ctc-dot-gap, var(--space-1, 1cqw));
height: var(--ctc-scene-bar-height, 8cqh);
padding-inline: var(--ctc-scene-pad, var(--space-2, 2cqw));
border-bottom: var(--ctc-border-width, 0.22cqw) solid var(--border, #334155);
}
.ctc-scene-dot {
width: var(--ctc-dot-size, 1.4cqw);
aspect-ratio: var(--ctc-pulse-ratio, 1);
border-radius: var(--ctc-round, 50%);
background: var(--ctc-primary, var(--fg, #f8fafc));
}
.ctc-scene-body {
display: grid;
grid-template-columns: var(--ctc-scene-columns, 1fr 2fr);
gap: var(--ctc-scene-gap, var(--space-3, 3cqw));
padding: var(--ctc-scene-body-pad, var(--space-3, 5cqh))
var(--ctc-scene-pad, var(--space-3, 3cqw));
}
.ctc-scene-panel {
min-height: var(--ctc-panel-height, 34cqh);
border-radius: var(--ctc-panel-radius, var(--radius, 1.2cqw));
background: color-mix(
in srgb,
var(--ctc-primary, var(--fg, #f8fafc)) var(--ctc-panel-strength, 24%),
var(--surface, #1e293b)
);
}
.ctc-scene-copy {
padding-top: var(--ctc-copy-top, var(--space-2, 2cqh));
}
.ctc-scene-line + .ctc-scene-line {
margin-top: var(--ctc-scene-line-gap, var(--space-3, 3cqh));
}
.ctc-scene-line:nth-child(1) {
width: var(--ctc-scene-line-one, 92%);
}
.ctc-scene-line:nth-child(2) {
width: var(--ctc-scene-line-two, 68%);
opacity: var(--ctc-muted-opacity, 0.42);
}
.ctc-scene-line:nth-child(3) {
width: var(--ctc-scene-line-three, 78%);
background: var(--ctc-secondary, var(--fg, #f8fafc));
}
</style>
<div
id="cut-the-curve-clip"
class="ctc-clip clip"
data-start="0"
data-duration="1"
data-track-index="0"
>
<div class="ctc-backdrop"></div>
<div class="ctc-subject is-outgoing" aria-hidden="true">
<div class="ctc-art ctc-cursor">
<span class="ctc-cursor-pulse"></span>
<svg viewBox="0 0 64 88" aria-hidden="true">
<path
class="ctc-cursor-shape"
d="M8 5 L54 43 L34 47 L45 75 L30 82 L19 53 L8 68 Z"
/>
</svg>
</div>
<div class="ctc-art ctc-card">
<div class="ctc-card-chip"></div>
<div class="ctc-card-line"></div>
<div class="ctc-card-line"></div>
</div>
<div class="ctc-art ctc-scene">
<div class="ctc-scene-bar">
<span class="ctc-scene-dot"></span><span class="ctc-scene-dot"></span
><span class="ctc-scene-dot"></span>
</div>
<div class="ctc-scene-body">
<div class="ctc-scene-panel"></div>
<div class="ctc-scene-copy">
<div class="ctc-scene-line"></div>
<div class="ctc-scene-line"></div>
<div class="ctc-scene-line"></div>
</div>
</div>
</div>
</div>
<div class="ctc-subject is-incoming" aria-hidden="true">
<div class="ctc-art ctc-cursor">
<span class="ctc-cursor-pulse"></span>
<svg viewBox="0 0 64 88" aria-hidden="true">
<path
class="ctc-cursor-shape"
d="M8 5 L54 43 L34 47 L45 75 L30 82 L19 53 L8 68 Z"
/>
</svg>
</div>
<div class="ctc-art ctc-card">
<div class="ctc-card-chip"></div>
<div class="ctc-card-line"></div>
<div class="ctc-card-line"></div>
</div>
<div class="ctc-art ctc-scene">
<div class="ctc-scene-bar">
<span class="ctc-scene-dot"></span><span class="ctc-scene-dot"></span
><span class="ctc-scene-dot"></span>
</div>
<div class="ctc-scene-body">
<div class="ctc-scene-panel"></div>
<div class="ctc-scene-copy">
<div class="ctc-scene-line"></div>
<div class="ctc-scene-line"></div>
<div class="ctc-scene-line"></div>
</div>
</div>
</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 outgoing = root.querySelector(".is-outgoing");
var incoming = root.querySelector(".is-incoming");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var subject =
vars.subject === "card" || vars.subject === "scene" ? vars.subject : "cursor";
var direction =
vars.direction === "right" || vars.direction === "up" || vars.direction === "down"
? vars.direction
: "left";
var rawCut = Number(vars.cutFraction);
var cutFraction = Number.isFinite(rawCut) ? Math.max(0, Math.min(1, rawCut)) : 0.33;
var rawBlur = Number(vars.blurPx);
var blurPx = Number.isFinite(rawBlur) ? Math.max(0, rawBlur) : 12;
var exit = vars.exit === "fade" || vars.exit === "up" ? vars.exit : "none";
root.dataset.subject = subject;
// Direction is the single owner of axis, sign, unit, and base travel.
var vectors = {
left: { axis: "x", sign: -1, unit: "cqw", distance: 34 },
right: { axis: "x", sign: 1, unit: "cqw", distance: 34 },
up: { axis: "y", sign: -1, unit: "cqh", distance: 26 },
down: { axis: "y", sign: 1, unit: "cqh", distance: 26 },
};
var vector = vectors[direction];
var duration = Math.max(0.001, parseFloat(root.dataset.duration || "1"));
// Exit none keeps the whole duration for the cut profile. An
// enabled exit reserves a short tail after the incoming lands.
var EXIT = exit === "none" ? 0 : Math.min(0.35, duration * 0.25);
var TRAVEL = Math.max(0.001, duration - EXIT);
var CUT_AT = TRAVEL * cutFraction;
var ENTRY_DURATION = TRAVEL - CUT_AT;
var entryDistance =
CUT_AT > 0 ? vector.distance * (ENTRY_DURATION / CUT_AT) : vector.distance * 2;
var seamBlur = "blur(" + blurPx + "px)";
var clearBlur = "blur(0px)";
var seamOpacity = 0.72;
var outgoingEnd = { opacity: seamOpacity, filter: seamBlur };
outgoingEnd[vector.axis] = vector.sign * vector.distance + vector.unit;
var incomingStart = { x: 0, y: 0, opacity: 0, filter: seamBlur };
incomingStart[vector.axis] = -vector.sign * entryDistance + vector.unit;
var incomingEnd = { opacity: 1, filter: clearBlur };
incomingEnd[vector.axis] = 0;
gsap.set(outgoing, { x: 0, y: 0, opacity: 1, filter: clearBlur });
gsap.set(incoming, incomingStart);
var tl = gsap.timeline({ paused: true });
if (CUT_AT > 0) {
tl.to(
outgoing,
Object.assign({}, outgoingEnd, { duration: CUT_AT, ease: "power4.in" }),
0,
);
}
// CUT: one visibility owner, matched blur and opacity on both sides.
tl.set(outgoing, { opacity: 0 }, CUT_AT);
tl.set(incoming, { opacity: seamOpacity }, CUT_AT);
tl.call(
function () {
root.dispatchEvent(
new CustomEvent("hf:sfx", {
detail: { id: "whip-cut", t: CUT_AT },
bubbles: true,
}),
);
},
[],
CUT_AT,
);
if (ENTRY_DURATION > 0) {
tl.to(
incoming,
Object.assign({}, incomingEnd, {
duration: ENTRY_DURATION,
ease: "power4.out",
}),
CUT_AT,
);
} else {
tl.set(incoming, incomingEnd, CUT_AT);
}
// Optional departure; exit none rests until the frame cuts.
if (exit === "fade") {
tl.to(incoming, { opacity: 0, duration: EXIT, ease: "power2.in" }, TRAVEL);
} else if (exit === "up") {
tl.to(
incoming,
{ opacity: 0, y: "-6cqh", duration: EXIT, ease: "power2.in" },
TRAVEL,
);
}
tl.seek(0);
window.__timelines = window.__timelines || {};
window.__timelines["cut-the-curve"] = tl;
})();
</script>
</div>
</template>
</body>
</html>
```
</Accordion>
{/* hf:generated-footer */}
Tagged `transition` `directional-cut` `velocity-match` `whip` `bridge` `demonstrate`.
## 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