Install
That writes one file:compositions/components/velocity-throw-snap.html.
Paste it into your composition
Opencompositions/components/velocity-throw-snap.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 |
|---|---|---|---|
hero_index | 2 | 0 to 4, step 1 | Zero-based index of the shot centered at the settle. |
accent | green | green, blue, violet | Highlight color used by the hero shot. |
card_label_prefix | Shot | string | Text placed before each shot number. |
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:
<div
data-composition-id="velocity-throw-snap"
data-composition-src="compositions/components/velocity-throw-snap.html"
data-variable-values='{"hero_index":2,"accent":"green","card_label_prefix":"Shot"}'
></div>
Source
velocity-throw-snap.html
velocity-throw-snap.html
<!doctype html>
<!--
velocity-throw-snap: HyperFrames video primitive (feature-tour / exhibit)
Concept: a five-shot rail whips in on an authored velocity curve, loses
speed quickly, then snaps past and back onto the selected hero shot. The
selected shot finishes exactly centered while its neighbors dim.
Variables:
- hero_index (number, 0 to 4, default 2): shot centered at the settle.
- accent (green | blue | violet, default green): hero highlight color.
- card_label_prefix (string, default "Shot"): label before each card number.
Envelope (fixed IN, elastic HOLD, no OUT):
IN_BASE = 1.40s, fast power4.out throw followed by back.out(1.7) snap
HOLD = elastic = max(0, D - IN), centered hero aura breathes subtly
OUT_BASE = 0s, the centered hero remains as the final state
If D is shorter than IN_BASE, the complete throw and snap compress to fit.
Mount contract: the runtime clones only this template. #root fills the
host box, establishes the cqw/cqh basis, has no data-width or data-height,
and registers one paused timeline under the hardcoded velocity-throw-snap id.
Rail position is CSS-owned: --vts-hero-index selects the centered card and
--vts-throw-x adds seek-driven travel in cqw units. No pixel measurements
are cached or read.
-->
<html
lang="en"
data-composition-id="velocity-throw-snap"
data-composition-duration="4"
data-composition-variables='[
{ "id": "hero_index", "type": "number", "role": "content", "label": "Hero index", "description": "Zero-based index of the shot centered at the settle.", "default": 2, "min": 0, "max": 4, "step": 1 },
{ "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Highlight color used by the hero shot.", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
{ "id": "card_label_prefix", "type": "string", "role": "content", "label": "Card label prefix", "description": "Text placed before each shot number.", "default": "Shot" }
]'
>
<head>
<meta charset="UTF-8" />
<title>Velocity Throw Snap</title>
</head>
<body>
<template>
<div id="root" data-composition-id="velocity-throw-snap" data-duration="4" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
#root {
--vts-card-width: 48;
--vts-card-gap: 4.5;
--vts-hero-index: 0;
--vts-throw-x: 0;
--vts-throw-y: 0;
--vts-tilt: 0;
position: absolute;
inset: 0;
overflow: hidden;
container-type: size;
isolation: isolate;
color: var(--fg, #f8fafc);
font-family: var(--font-body, Inter, system-ui, sans-serif);
pointer-events: none;
}
.vts-clip {
position: absolute;
inset: 0;
overflow: hidden;
background:
radial-gradient(
circle at 50% 46%,
color-mix(in srgb, var(--vts-accent) 13%, var(--bg, #172033)) 0%,
var(--bg, #0b0c0e) 72%
),
var(--bg, #0b0c0e);
}
.vts-rail {
position: absolute;
left: 0;
top: 18cqh;
display: flex;
align-items: center;
gap: calc(var(--vts-card-gap) * 1cqw);
width: max-content;
transform: translateX(
calc(
(
50 - var(--vts-card-width) / 2 - var(--vts-hero-index) *
(var(--vts-card-width) + var(--vts-card-gap)) + var(--vts-throw-x)
) *
1cqw
)
)
translateY(calc(var(--vts-throw-y) * 1cqh)) rotate(calc(var(--vts-tilt) * 1deg));
transform-origin: 50% 50%;
will-change: transform;
}
.vts-card {
position: relative;
flex: 0 0 calc(var(--vts-card-width) * 1cqw);
height: 62cqh;
overflow: hidden;
border: 0.16cqmin solid color-mix(in srgb, var(--border, #475569) 76%, transparent);
border-radius: var(--radius, 3.2cqmin);
background: linear-gradient(
150deg,
var(--surface, #f8fafc) 0%,
var(--surface, #dbe5f1) 100%
);
color: var(--fg, #101827);
box-shadow: 0 3.6cqh 8cqh color-mix(in srgb, var(--bg, #000000) 46%, transparent);
transform-origin: 50% 50%;
will-change: transform, opacity, border-color, box-shadow;
}
.vts-aura {
position: absolute;
inset: -0.2cqmin;
z-index: 2;
border: 0.28cqmin solid var(--vts-accent);
border-radius: inherit;
box-shadow:
inset 0 0 3cqmin color-mix(in srgb, var(--vts-accent) 16%, transparent),
0 0 4cqmin color-mix(in srgb, var(--vts-accent) 36%, transparent);
opacity: 0;
pointer-events: none;
}
.vts-card-top {
height: 8cqh;
display: flex;
align-items: center;
justify-content: space-between;
padding: 0 2.6cqw;
border-bottom: 0.1cqmin solid var(--border, #c4ceda);
background: color-mix(in srgb, var(--surface, #ffffff) 58%, transparent);
}
.vts-dots {
display: flex;
gap: 0.45cqw;
}
.vts-dots i {
width: 0.58cqw;
aspect-ratio: 1;
border-radius: 50%;
background: var(--muted, #91a0b3);
}
.vts-index {
color: var(--vts-accent-dark);
font-family: var(--font-mono, ui-monospace, "SF Mono", Menlo, Consolas, monospace);
font-size: 1.45cqw;
font-weight: 760;
letter-spacing: 0.12em;
}
.vts-preview {
height: 38cqh;
display: grid;
grid-template-columns: 1.05fr 0.95fr;
gap: 1.8cqw;
padding: 3cqh 2.6cqw;
}
.vts-panel,
.vts-stack {
border: 0.1cqmin solid var(--border, #c4ceda);
border-radius: 1.5cqmin;
background: var(--surface, #edf2f7);
}
.vts-panel {
position: relative;
overflow: hidden;
background: linear-gradient(
145deg,
color-mix(in srgb, var(--vts-accent) 30%, var(--surface, #eaf0f6)),
var(--surface, #d7e0ea)
);
}
.vts-panel::before,
.vts-panel::after {
content: "";
position: absolute;
border-radius: 1cqmin;
background: color-mix(in srgb, var(--vts-accent) 72%, var(--surface, #ffffff));
}
.vts-panel::before {
width: 11cqw;
height: 11cqw;
left: 3cqw;
top: 5cqh;
}
.vts-panel::after {
left: 3cqw;
right: 3cqw;
bottom: 4cqh;
height: 1.2cqh;
}
.vts-stack {
display: grid;
align-content: center;
gap: 2.2cqh;
padding: 2cqw;
}
.vts-stack i {
display: block;
height: 1.2cqh;
border-radius: 1cqh;
background: var(--muted, #bcc8d6);
}
.vts-stack i:first-child {
width: 72%;
background: var(--vts-accent);
}
.vts-stack i:last-child {
width: 56%;
}
.vts-label {
display: block;
max-width: 100%;
padding: 0 2.6cqw;
overflow: hidden;
color: var(--fg, #101827);
font-family: var(--font-display, Inter, system-ui, sans-serif);
font-size: 3.4cqw;
font-weight: 780;
line-height: 1;
letter-spacing: -0.04em;
text-overflow: ellipsis;
white-space: nowrap;
}
.vts-card:nth-child(2) .vts-preview,
.vts-card:nth-child(5) .vts-preview {
grid-template-columns: 0.78fr 1.22fr;
}
.vts-card:nth-child(3) .vts-panel::before {
width: 14cqw;
border-radius: 50%;
}
.vts-card:nth-child(4) .vts-preview {
grid-template-columns: 1fr;
}
.vts-card:nth-child(4) .vts-stack {
display: none;
}
</style>
<div
id="velocity-throw-snap-clip"
class="vts-clip clip"
data-start="0"
data-duration="4"
data-track-index="0"
>
<div class="vts-rail" role="list" aria-label="Feature shots">
<article class="vts-card" role="listitem">
<span class="vts-aura" aria-hidden="true"></span>
<div class="vts-card-top">
<span class="vts-dots"><i></i><i></i><i></i></span><span class="vts-index">01</span>
</div>
<div class="vts-preview">
<span class="vts-panel"></span><span class="vts-stack"><i></i><i></i><i></i></span>
</div>
<span class="vts-label"></span>
</article>
<article class="vts-card" role="listitem">
<span class="vts-aura" aria-hidden="true"></span>
<div class="vts-card-top">
<span class="vts-dots"><i></i><i></i><i></i></span><span class="vts-index">02</span>
</div>
<div class="vts-preview">
<span class="vts-panel"></span><span class="vts-stack"><i></i><i></i><i></i></span>
</div>
<span class="vts-label"></span>
</article>
<article class="vts-card" role="listitem">
<span class="vts-aura" aria-hidden="true"></span>
<div class="vts-card-top">
<span class="vts-dots"><i></i><i></i><i></i></span><span class="vts-index">03</span>
</div>
<div class="vts-preview">
<span class="vts-panel"></span><span class="vts-stack"><i></i><i></i><i></i></span>
</div>
<span class="vts-label"></span>
</article>
<article class="vts-card" role="listitem">
<span class="vts-aura" aria-hidden="true"></span>
<div class="vts-card-top">
<span class="vts-dots"><i></i><i></i><i></i></span><span class="vts-index">04</span>
</div>
<div class="vts-preview">
<span class="vts-panel"></span><span class="vts-stack"><i></i><i></i><i></i></span>
</div>
<span class="vts-label"></span>
</article>
<article class="vts-card" role="listitem">
<span class="vts-aura" aria-hidden="true"></span>
<div class="vts-card-top">
<span class="vts-dots"><i></i><i></i><i></i></span><span class="vts-index">05</span>
</div>
<div class="vts-preview">
<span class="vts-panel"></span><span class="vts-stack"><i></i><i></i><i></i></span>
</div>
<span class="vts-label"></span>
</article>
</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 clip = root.querySelector(".vts-clip");
var rail = root.querySelector(".vts-rail");
var cards = Array.from(root.querySelectorAll(".vts-card"));
var labels = Array.from(root.querySelectorAll(".vts-label"));
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var heroValue = Number(vars.hero_index);
var heroIndex = Number.isFinite(heroValue)
? Math.max(0, Math.min(4, Math.round(heroValue)))
: 2;
var prefix = vars.card_label_prefix == null ? "Shot" : String(vars.card_label_prefix);
var accentName =
vars.accent === "blue" || vars.accent === "violet" ? vars.accent : "green";
var themeStyles = getComputedStyle(root);
var palettes = {
green: {
accent: themeStyles.getPropertyValue("--brand").trim() || "#34d399",
dark: themeStyles.getPropertyValue("--brand").trim() || "#08795b",
glow: "rgba(52, 211, 153, 0.4)",
},
blue: {
accent: themeStyles.getPropertyValue("--accent").trim() || "#60a5fa",
dark: themeStyles.getPropertyValue("--accent").trim() || "#2563a8",
glow: "rgba(96, 165, 250, 0.42)",
},
violet: {
accent: themeStyles.getPropertyValue("--accent-2").trim() || "#a78bfa",
dark: themeStyles.getPropertyValue("--accent-2").trim() || "#6742b8",
glow: "rgba(167, 139, 250, 0.42)",
},
};
var palette = palettes[accentName];
root.style.setProperty("--vts-hero-index", heroIndex);
root.style.setProperty("--vts-accent", palette.accent);
root.style.setProperty("--vts-accent-dark", palette.dark);
labels.forEach(function (label, index) {
label.textContent = (prefix.length > 0 ? prefix + " " : "") + String(index + 1);
});
var heroCard = cards[heroIndex];
var heroAura = heroCard.querySelector(".vts-aura");
var nonHeroCards = cards.filter(function (_, index) {
return index !== heroIndex;
});
heroCard.setAttribute("aria-current", "true");
var IN_BASE = 1.4;
var THROW_BASE = 0.78;
var SNAP_BASE = 0.62;
var durationValue = parseFloat(root.dataset.duration || "4");
var duration = Number.isFinite(durationValue) ? Math.max(0.001, durationValue) : 4;
var IN = Math.min(IN_BASE, duration);
var HOLD = Math.max(0, duration - IN);
var motionScale = IN / IN_BASE;
var THROW = THROW_BASE * motionScale;
var SNAP = SNAP_BASE * motionScale;
var SNAP_AT = THROW;
gsap.set(clip, { opacity: 0 });
gsap.set(rail, {
"--vts-throw-x": 140,
"--vts-throw-y": 7,
"--vts-tilt": 0.8,
});
gsap.set(cards, { opacity: 0.82, scale: 0.97 });
gsap.set(heroAura, { opacity: 0, scale: 0.98 });
var tl = gsap.timeline({ paused: true });
tl.to(clip, { opacity: 1, duration: Math.min(0.2, IN), ease: "power2.out" }, 0);
// Fast travel loses most of its velocity under the whip-out ease.
tl.to(
rail,
{
"--vts-throw-x": 16,
"--vts-throw-y": -1.4,
"--vts-tilt": -0.22,
duration: THROW,
ease: "power4.out",
},
0,
);
// The final back curve crosses zero, then returns to the exact center.
tl.to(
rail,
{
"--vts-throw-x": 0,
"--vts-throw-y": 0,
"--vts-tilt": 0,
duration: SNAP,
ease: "back.out(1.7)",
},
SNAP_AT,
);
tl.to(
nonHeroCards,
{ opacity: 0.62, scale: 0.95, duration: SNAP, ease: "power2.out" },
SNAP_AT,
);
tl.to(
heroCard,
{
opacity: 1,
scale: 1.04,
borderColor: palette.accent,
boxShadow: "0 4.2cqh 10cqh " + palette.glow,
duration: SNAP,
ease: "back.out(1.7)",
},
SNAP_AT,
);
tl.to(
heroAura,
{ opacity: 0.58, scale: 1, duration: SNAP * 0.7, ease: "power2.out" },
SNAP_AT + SNAP * 0.3,
);
if (HOLD > 0.4) {
var breathHalf = Math.min(0.65, HOLD / 2);
var breathRepeat = Math.max(0, Math.floor(HOLD / breathHalf) - 1);
tl.to(
heroAura,
{
opacity: 0.78,
scale: 1.015,
duration: breathHalf,
ease: "sine.inOut",
yoyo: true,
repeat: breathRepeat,
},
IN,
);
}
tl.seek(0);
window.__timelines = window.__timelines || {};
window.__timelines["velocity-throw-snap"] = tl;
})();
</script>
</div>
</template>
</body>
</html>
motion-primitive feature-tour rail velocity throw snap physics.