mirror of
https://github.com/heygen-com/hyperframes.git
synced 2026-11-11 19:09:20 +00:00
The generated catalog pages rendered the "Source" accordion title as a
JSX expression, `<Accordion title={`name.html`}>`. Mintlify's search
indexer stringifies expression attribute nodes rather than evaluating
them, so every one of the 399 catalog pages surfaced its Source section
in search results as "[object Object]" (visible on the Scroll Feed page,
among others).
The template literal carried no escaping benefit: every title is a
single-segment `name.html` path, and a double-quoted JSX string handles
it directly. Introduce `mdxStringAttribute`, which emits a plain
`name="value"` attribute and escapes `& " < { }` as HTML character
references (MDX decodes references inside quoted attribute values, and
unlike JSON.stringify it does not rely on backslash escapes, which JSX
strings do not honour). Use it for both the Source accordion title and
the preview iframe title, and regenerate the catalog pages.
Regenerated with `npx tsx scripts/generate-catalog-pages.ts`; the only
change across the 399 pages is the one Accordion title line each.
Co-authored-by: Miguel Ángel <miguel.sierra@heygen.com>
695 lines
31 KiB
Plaintext
695 lines
31 KiB
Plaintext
---
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title: "Line Swap"
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description: "A masked full-line beat replacement: line A holds center then exits up through an overflow-hidden mask as line B enters bottom-up on the same beat, with an optional accent underline drawing beneath one word of line B."
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---
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import { InstallCommand } from "/snippets/install-command.jsx";
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import { VariablesExplorer } from "/snippets/variables-explorer.jsx";
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## Install
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<InstallCommand command="npx hyperframes add line-swap" item="line-swap" />
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That writes one file: `compositions/components/line-swap.html`.
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<VariablesExplorer
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previewSrc="/public/catalog/components/line-swap.json"
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compositionId="line-swap"
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compositionSrc="compositions/components/line-swap.html"
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variables={[{"id":"line_a","type":"string","role":"content","label":"Line A","description":"First line; holds center inside the mask, then exits up on the swap beat.","default":"Everyone promised you AI."},{"id":"line_b","type":"string","role":"content","label":"Line B","description":"Replacement line; enters bottom-up on the swap beat and holds.","default":"Almost nobody promised you control."},{"id":"swap_at","type":"number","role":"timing","label":"Swap at","description":"Second (from mount start) of the beat replacement. Clamped so the swap and underline complete before any exit.","default":1.5,"min":0,"step":0.1,"unit":"s"},{"id":"underline_word","type":"string","role":"content","label":"Underline word","description":"First case-insensitive substring match in line B gets the accent underline after landing. Empty disables it.","default":"control"},{"id":"accent","type":"enum","role":"style","label":"Accent","description":"Underline color from the contract token map.","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. Default none: the landed line holds until the frame cuts.","default":"none","options":[{"value":"none","label":"None"},{"value":"fade","label":"Fade"},{"value":"up","label":"Up"}]}]}
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>
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```html line-swap.html
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<!doctype html>
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<!--
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line-swap: HyperFrames video primitive (text effects / beat replacement)
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A masked full-line beat replacement, generalizing flagship frame 01: line_a
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rises into an overflow-hidden mask and holds center, then on the swap beat
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it exits up through the mask as line_b enters bottom-up on the same beat.
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One restrained slam, smooth ease, no overshoot. Optionally an accent
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underline draws left to right beneath underline_word of line_b after it
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lands (scaleX from a left origin, the flagship bar draw).
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Variables:
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line_a (string): the first line, replaced on the beat.
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line_b (string): the line that lands and holds.
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swap_at (seconds): the beat, relative to mount start. Clamped so line_a
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finishes entering first and line_b plus the underline complete before
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any exit begins.
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underline_word (string): first case-insensitive substring match inside
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line_b gets the underline. Empty or unmatched disables it.
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accent (green | blue | violet): underline color via the contract token map.
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exit (none | fade | up, default none): frame roots own transitions;
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holds end films.
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Envelope, fixed IN and OUT with elastic HOLD only (never time-scaled):
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IN_A_BASE = 0.50s line_a enters bottom-up through the mask
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SWAP span = 0.72s line_a up-and-out (0.35s) overlapping line_b in
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(starts 0.22s after the beat, lands 0.50s later)
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UL span = 0.60s 0.15s beat after the land, then a 0.45s draw
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(0 when underline_word is empty or unmatched)
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HOLD = max(0, D - phases), completely still
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OUT_BASE = 0s for exit none, otherwise 0.45s
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If D is shorter than the fixed phases, they compress together.
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Mount contract: the runtime clones only this template. #root fills the host
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box, establishes the container query basis, has no data-width or
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data-height, and registers one paused timeline under the literal
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line-swap key.
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-->
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<html
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lang="en"
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data-composition-id="line-swap"
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data-composition-duration="3.5"
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data-composition-variables='[
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{ "id": "line_a", "type": "string", "role": "content", "label": "Line A", "description": "First line; holds center inside the mask, then exits up on the swap beat.", "default": "Everyone promised you AI." },
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{ "id": "line_b", "type": "string", "role": "content", "label": "Line B", "description": "Replacement line; enters bottom-up on the swap beat and holds.", "default": "Almost nobody promised you control." },
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{ "id": "swap_at", "type": "number", "role": "timing", "label": "Swap at", "description": "Second (from mount start) of the beat replacement. Clamped so the swap and underline complete before any exit.", "default": 1.5, "min": 0, "step": 0.1, "unit": "s" },
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{ "id": "underline_word", "type": "string", "role": "content", "label": "Underline word", "description": "First case-insensitive substring match in line B gets the accent underline after landing. Empty disables it.", "default": "control" },
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{ "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Underline color from the contract token map.", "default": "green", "options": [{ "value": "green", "label": "Green" }, { "value": "blue", "label": "Blue" }, { "value": "violet", "label": "Violet" }] },
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{ "id": "exit", "type": "enum", "role": "timing", "label": "Exit", "description": "Optional departure. Default none: the landed line holds until the frame cuts.", "default": "none", "options": [{ "value": "none", "label": "None" }, { "value": "fade", "label": "Fade" }, { "value": "up", "label": "Up" }] }
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]'
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>
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<head>
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<meta charset="UTF-8" />
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<title>Line Swap</title>
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</head>
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<body>
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<template>
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<div id="root" data-composition-id="line-swap" data-duration="3.5" data-fps="30">
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<style>
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*,
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*::before,
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*::after {
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box-sizing: border-box;
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}
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#root {
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position: absolute;
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inset: 0;
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overflow: hidden;
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container-type: size;
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isolation: isolate;
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background: var(--bg, #0b0c0e);
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color: var(--fg, #f8fafc);
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font-family: var(--font-display, Inter, system-ui, sans-serif);
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pointer-events: none;
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}
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.ls-clip {
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position: absolute;
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inset: 0;
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display: grid;
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place-items: center;
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overflow: hidden;
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}
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.ls-stage {
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width: 94cqw;
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will-change: transform, opacity;
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}
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/* Beat mask: both lines live inside; the swap slides through it. */
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.ls-mask {
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position: relative;
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width: 100%;
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height: calc(var(--ls-font-size, min(7cqw, 16cqh)) * 1.42);
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overflow: hidden;
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}
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.ls-line {
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position: absolute;
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inset: 0;
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display: flex;
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align-items: center;
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justify-content: center;
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font-size: var(--ls-font-size, min(7cqw, 16cqh));
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font-weight: 600;
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line-height: 1;
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letter-spacing: -0.02em;
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white-space: nowrap;
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will-change: transform;
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}
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/* One inline wrapper per line: a bare text node next to the
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underline span would become separate flex items and the boundary
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space would collapse ("youcontrol."). */
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.ls-line-inner {
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display: inline;
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}
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.ls-ul-wrap {
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position: relative;
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display: inline-block;
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white-space: nowrap;
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}
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.ls-underline {
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position: absolute;
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left: 0.02em;
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right: 0.02em;
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bottom: -0.14em;
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height: 0.055em;
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border-radius: 0.03em;
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transform-origin: left center;
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}
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</style>
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<div
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id="line-swap-clip"
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class="ls-clip clip"
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data-start="0"
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data-duration="3.5"
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data-track-index="0"
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>
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<div class="ls-stage" role="img">
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<div class="ls-mask">
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<div class="ls-line ls-line-a"><span class="ls-line-inner"></span></div>
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<div class="ls-line ls-line-b"><span class="ls-line-inner"></span></div>
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</div>
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</div>
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</div>
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<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
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<script>
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(function () {
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"use strict";
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var root = document.getElementById("root");
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// Literal key: the flattening step strips data-composition-id off
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// the mounted root, so reading it back would register "null".
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var compositionId = "line-swap";
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var stage = root.querySelector(".ls-stage");
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var lineAEl = root.querySelector(".ls-line-a");
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var lineBEl = root.querySelector(".ls-line-b");
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var lineAInner = lineAEl.querySelector(".ls-line-inner");
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var lineBInner = lineBEl.querySelector(".ls-line-inner");
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var vars =
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window.__hyperframes && window.__hyperframes.getVariables
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? window.__hyperframes.getVariables()
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: {};
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function asLine(value, fallback) {
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return value == null ? fallback : String(value).trim().replace(/\s+/g, " ");
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}
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var lineA = asLine(vars.line_a, "Everyone promised you AI.");
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var lineB = asLine(vars.line_b, "Almost nobody promised you control.");
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var underlineWord = asLine(vars.underline_word, "control");
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var accentColors = {
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green: "var(--brand, #71f5a7)",
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blue: "var(--accent, #61a8ff)",
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violet: "var(--accent-2, #c5a3ff)",
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};
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var accent = Object.prototype.hasOwnProperty.call(accentColors, vars.accent)
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? vars.accent
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: "green";
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var exit = vars.exit === "fade" || vars.exit === "up" ? vars.exit : "none";
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lineAInner.textContent = lineA;
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// Split line_b around the first case-insensitive underline match.
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// textContent nodes only, never innerHTML.
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var matchIndex =
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underlineWord.length > 0
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? lineB.toLowerCase().indexOf(underlineWord.toLowerCase())
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: -1;
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var underlineEl = null;
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if (matchIndex >= 0) {
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var before = lineB.slice(0, matchIndex);
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var matched = lineB.slice(matchIndex, matchIndex + underlineWord.length);
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var after = lineB.slice(matchIndex + underlineWord.length);
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if (before) lineBInner.appendChild(document.createTextNode(before));
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var wrap = document.createElement("span");
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wrap.className = "ls-ul-wrap";
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wrap.appendChild(document.createTextNode(matched));
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underlineEl = document.createElement("span");
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underlineEl.className = "ls-underline";
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underlineEl.setAttribute("aria-hidden", "true");
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// style.background, not a class: var() resolves at point of use.
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underlineEl.style.background = accentColors[accent];
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wrap.appendChild(underlineEl);
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lineBInner.appendChild(wrap);
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if (after) lineBInner.appendChild(document.createTextNode(after));
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} else {
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lineBInner.textContent = lineB;
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}
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stage.setAttribute("aria-label", lineA + " " + lineB);
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// Deterministic character-count fit against the longer line; both
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// lines are nowrap, so the fit keeps them inside the stage.
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var characters = Math.max(1, Array.from(lineA).length, Array.from(lineB).length);
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var fitted = Math.max(3.4, Math.min(9, 168 / characters));
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root.style.setProperty("--ls-font-size", "min(" + fitted.toFixed(3) + "cqw, 16cqh)");
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// RETIME RANGE: fixed phases; HOLD is the only elastic span.
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var IN_A_BASE = 0.5;
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var EXIT_A_BASE = 0.35;
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var LAG_BASE = 0.22; // line_b starts this long after the beat
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var IN_B_BASE = 0.5;
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var UL_BEAT_BASE = 0.15;
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var UL_BASE = underlineEl ? 0.45 : 0;
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var OUT_BASE = exit === "none" ? 0 : 0.45;
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var duration = Math.max(0.001, parseFloat(root.dataset.duration || "3.5"));
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var swapSpanBase = LAG_BASE + IN_B_BASE;
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var ulSpanBase = underlineEl ? UL_BEAT_BASE + UL_BASE : 0;
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var totalBase = IN_A_BASE + swapSpanBase + ulSpanBase + OUT_BASE;
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var scale = duration < totalBase ? duration / totalBase : 1;
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var IN_A = IN_A_BASE * scale;
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var EXIT_A = EXIT_A_BASE * scale;
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var LAG = LAG_BASE * scale;
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var IN_B = IN_B_BASE * scale;
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var UL_BEAT = UL_BEAT_BASE * scale;
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var UL = UL_BASE * scale;
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var OUT = OUT_BASE * scale;
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var OUT_START = duration - OUT;
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var swapAtRaw = Number(vars.swap_at);
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var swapAt = Number.isFinite(swapAtRaw) ? Math.max(0, swapAtRaw) : 1.5;
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// line_a fully arrives before the beat; the swap and the
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// underline always complete before the exit begins.
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swapAt = Math.min(swapAt, Math.max(IN_A, OUT_START - (LAG + IN_B + UL_BEAT + UL)));
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swapAt = Math.max(swapAt, IN_A);
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var landB = swapAt + LAG + IN_B;
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gsap.set(lineBEl, { yPercent: 115 });
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if (underlineEl) gsap.set(underlineEl, { scaleX: 0 });
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var tl = gsap.timeline({ paused: true });
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// IN: line_a enters bottom-up through the mask. One move.
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tl.fromTo(
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lineAEl,
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{ yPercent: 115 },
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{ yPercent: 0, duration: IN_A, ease: "power4.out" },
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0,
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);
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// SWAP: the beat replacement. line_a exits up through the mask as
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// line_b slides in bottom-up. Single restrained slam, smooth ease.
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tl.fromTo(
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lineAEl,
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{ yPercent: 0 },
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{ yPercent: -115, duration: EXIT_A, ease: "power2.in", immediateRender: false },
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swapAt,
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);
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tl.fromTo(
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lineBEl,
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{ yPercent: 115 },
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{ yPercent: 0, duration: IN_B, ease: "power4.out" },
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swapAt + LAG,
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);
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// UNDERLINE: accent bar draws left to right after line_b lands.
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if (underlineEl) {
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tl.fromTo(
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underlineEl,
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{ scaleX: 0 },
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{ scaleX: 1, duration: UL, ease: "power2.out" },
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landB + UL_BEAT,
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);
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}
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// HOLD: completely still.
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// OUT: optional departure; exit none holds until the frame cuts.
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if (exit === "fade") {
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tl.to(stage, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);
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} else if (exit === "up") {
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tl.to(stage, { opacity: 0, y: "-7cqh", duration: OUT, ease: "power2.in" }, OUT_START);
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}
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tl.seek(0);
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window.__timelines = window.__timelines || {};
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window.__timelines[compositionId] = tl;
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})();
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</script>
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</div>
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</template>
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</body>
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</html>
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```
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</VariablesExplorer>
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## Paste it into your composition
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Open `compositions/components/line-swap.html` and copy what is inside into your own composition.
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A component has no size or duration of its own. It takes both from the composition
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you paste it into.
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## Variables
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Every one of these has a default, so the piece works untouched. Set the ones you
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want to change on the element:
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|
| Variable | Default | Accepts | What it does |
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| --- | --- | --- | --- |
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| `line_a` | `Everyone promised you AI.` | string | First line; holds center inside the mask, then exits up on the swap beat. |
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| `line_b` | `Almost nobody promised you control.` | string | Replacement line; enters bottom-up on the swap beat and holds. |
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| `swap_at` | `1.5` | number | Second (from mount start) of the beat replacement. Clamped so the swap and underline complete before any exit. |
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| `underline_word` | `control` | string | First case-insensitive substring match in line B gets the accent underline after landing. Empty disables it. |
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| `accent` | `green` | `green`, `blue`, `violet` | Underline color from the contract token map. |
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| `exit` | `none` | `none`, `fade`, `up` | Optional departure. Default none: the landed line holds until the frame cuts. |
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Set them with `data-variable-values` on the element that mounts it. These are the
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defaults, so this behaves exactly like the preview above until you change one:
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```html wrap
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<div
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data-composition-id="line-swap"
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data-composition-src="compositions/components/line-swap.html"
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data-variable-values='{"line_a":"Everyone promised you AI.","line_b":"Almost nobody promised you control.","swap_at":1.5,"underline_word":"control","accent":"green","exit":"none"}'
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></div>
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```
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## Source
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|
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<Accordion title="line-swap.html">
|
|
|
|
```html
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<!doctype html>
|
|
<!--
|
|
line-swap: HyperFrames video primitive (text effects / beat replacement)
|
|
|
|
A masked full-line beat replacement, generalizing flagship frame 01: line_a
|
|
rises into an overflow-hidden mask and holds center, then on the swap beat
|
|
it exits up through the mask as line_b enters bottom-up on the same beat.
|
|
One restrained slam, smooth ease, no overshoot. Optionally an accent
|
|
underline draws left to right beneath underline_word of line_b after it
|
|
lands (scaleX from a left origin, the flagship bar draw).
|
|
|
|
Variables:
|
|
line_a (string): the first line, replaced on the beat.
|
|
line_b (string): the line that lands and holds.
|
|
swap_at (seconds): the beat, relative to mount start. Clamped so line_a
|
|
finishes entering first and line_b plus the underline complete before
|
|
any exit begins.
|
|
underline_word (string): first case-insensitive substring match inside
|
|
line_b gets the underline. Empty or unmatched disables it.
|
|
accent (green | blue | violet): underline color via the contract token map.
|
|
exit (none | fade | up, default none): frame roots own transitions;
|
|
holds end films.
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|
|
|
Envelope, fixed IN and OUT with elastic HOLD only (never time-scaled):
|
|
IN_A_BASE = 0.50s line_a enters bottom-up through the mask
|
|
SWAP span = 0.72s line_a up-and-out (0.35s) overlapping line_b in
|
|
(starts 0.22s after the beat, lands 0.50s later)
|
|
UL span = 0.60s 0.15s beat after the land, then a 0.45s draw
|
|
(0 when underline_word is empty or unmatched)
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HOLD = max(0, D - phases), completely still
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OUT_BASE = 0s for exit none, otherwise 0.45s
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If D is shorter than the fixed phases, they compress together.
|
|
|
|
Mount contract: the runtime clones only this template. #root fills the host
|
|
box, establishes the container query basis, has no data-width or
|
|
data-height, and registers one paused timeline under the literal
|
|
line-swap key.
|
|
-->
|
|
<html
|
|
lang="en"
|
|
data-composition-id="line-swap"
|
|
data-composition-duration="3.5"
|
|
data-composition-variables='[
|
|
{ "id": "line_a", "type": "string", "role": "content", "label": "Line A", "description": "First line; holds center inside the mask, then exits up on the swap beat.", "default": "Everyone promised you AI." },
|
|
{ "id": "line_b", "type": "string", "role": "content", "label": "Line B", "description": "Replacement line; enters bottom-up on the swap beat and holds.", "default": "Almost nobody promised you control." },
|
|
{ "id": "swap_at", "type": "number", "role": "timing", "label": "Swap at", "description": "Second (from mount start) of the beat replacement. Clamped so the swap and underline complete before any exit.", "default": 1.5, "min": 0, "step": 0.1, "unit": "s" },
|
|
{ "id": "underline_word", "type": "string", "role": "content", "label": "Underline word", "description": "First case-insensitive substring match in line B gets the accent underline after landing. Empty disables it.", "default": "control" },
|
|
{ "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Underline color from the contract token map.", "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. Default none: the landed line holds 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>Line Swap</title>
|
|
</head>
|
|
<body>
|
|
<template>
|
|
<div id="root" data-composition-id="line-swap" data-duration="3.5" data-fps="30">
|
|
<style>
|
|
*,
|
|
*::before,
|
|
*::after {
|
|
box-sizing: border-box;
|
|
}
|
|
|
|
#root {
|
|
position: absolute;
|
|
inset: 0;
|
|
overflow: hidden;
|
|
container-type: size;
|
|
isolation: isolate;
|
|
background: var(--bg, #0b0c0e);
|
|
color: var(--fg, #f8fafc);
|
|
font-family: var(--font-display, Inter, system-ui, sans-serif);
|
|
pointer-events: none;
|
|
}
|
|
|
|
.ls-clip {
|
|
position: absolute;
|
|
inset: 0;
|
|
display: grid;
|
|
place-items: center;
|
|
overflow: hidden;
|
|
}
|
|
|
|
.ls-stage {
|
|
width: 94cqw;
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|
will-change: transform, opacity;
|
|
}
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|
|
|
/* Beat mask: both lines live inside; the swap slides through it. */
|
|
.ls-mask {
|
|
position: relative;
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|
width: 100%;
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|
height: calc(var(--ls-font-size, min(7cqw, 16cqh)) * 1.42);
|
|
overflow: hidden;
|
|
}
|
|
|
|
.ls-line {
|
|
position: absolute;
|
|
inset: 0;
|
|
display: flex;
|
|
align-items: center;
|
|
justify-content: center;
|
|
font-size: var(--ls-font-size, min(7cqw, 16cqh));
|
|
font-weight: 600;
|
|
line-height: 1;
|
|
letter-spacing: -0.02em;
|
|
white-space: nowrap;
|
|
will-change: transform;
|
|
}
|
|
|
|
/* One inline wrapper per line: a bare text node next to the
|
|
underline span would become separate flex items and the boundary
|
|
space would collapse ("youcontrol."). */
|
|
.ls-line-inner {
|
|
display: inline;
|
|
}
|
|
|
|
.ls-ul-wrap {
|
|
position: relative;
|
|
display: inline-block;
|
|
white-space: nowrap;
|
|
}
|
|
|
|
.ls-underline {
|
|
position: absolute;
|
|
left: 0.02em;
|
|
right: 0.02em;
|
|
bottom: -0.14em;
|
|
height: 0.055em;
|
|
border-radius: 0.03em;
|
|
transform-origin: left center;
|
|
}
|
|
</style>
|
|
|
|
<div
|
|
id="line-swap-clip"
|
|
class="ls-clip clip"
|
|
data-start="0"
|
|
data-duration="3.5"
|
|
data-track-index="0"
|
|
>
|
|
<div class="ls-stage" role="img">
|
|
<div class="ls-mask">
|
|
<div class="ls-line ls-line-a"><span class="ls-line-inner"></span></div>
|
|
<div class="ls-line ls-line-b"><span class="ls-line-inner"></span></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");
|
|
// Literal key: the flattening step strips data-composition-id off
|
|
// the mounted root, so reading it back would register "null".
|
|
var compositionId = "line-swap";
|
|
var stage = root.querySelector(".ls-stage");
|
|
var lineAEl = root.querySelector(".ls-line-a");
|
|
var lineBEl = root.querySelector(".ls-line-b");
|
|
var lineAInner = lineAEl.querySelector(".ls-line-inner");
|
|
var lineBInner = lineBEl.querySelector(".ls-line-inner");
|
|
var vars =
|
|
window.__hyperframes && window.__hyperframes.getVariables
|
|
? window.__hyperframes.getVariables()
|
|
: {};
|
|
|
|
function asLine(value, fallback) {
|
|
return value == null ? fallback : String(value).trim().replace(/\s+/g, " ");
|
|
}
|
|
var lineA = asLine(vars.line_a, "Everyone promised you AI.");
|
|
var lineB = asLine(vars.line_b, "Almost nobody promised you control.");
|
|
var underlineWord = asLine(vars.underline_word, "control");
|
|
var accentColors = {
|
|
green: "var(--brand, #71f5a7)",
|
|
blue: "var(--accent, #61a8ff)",
|
|
violet: "var(--accent-2, #c5a3ff)",
|
|
};
|
|
var accent = Object.prototype.hasOwnProperty.call(accentColors, vars.accent)
|
|
? vars.accent
|
|
: "green";
|
|
var exit = vars.exit === "fade" || vars.exit === "up" ? vars.exit : "none";
|
|
|
|
lineAInner.textContent = lineA;
|
|
|
|
// Split line_b around the first case-insensitive underline match.
|
|
// textContent nodes only, never innerHTML.
|
|
var matchIndex =
|
|
underlineWord.length > 0
|
|
? lineB.toLowerCase().indexOf(underlineWord.toLowerCase())
|
|
: -1;
|
|
var underlineEl = null;
|
|
if (matchIndex >= 0) {
|
|
var before = lineB.slice(0, matchIndex);
|
|
var matched = lineB.slice(matchIndex, matchIndex + underlineWord.length);
|
|
var after = lineB.slice(matchIndex + underlineWord.length);
|
|
if (before) lineBInner.appendChild(document.createTextNode(before));
|
|
|
|
var wrap = document.createElement("span");
|
|
wrap.className = "ls-ul-wrap";
|
|
wrap.appendChild(document.createTextNode(matched));
|
|
underlineEl = document.createElement("span");
|
|
underlineEl.className = "ls-underline";
|
|
underlineEl.setAttribute("aria-hidden", "true");
|
|
// style.background, not a class: var() resolves at point of use.
|
|
underlineEl.style.background = accentColors[accent];
|
|
wrap.appendChild(underlineEl);
|
|
lineBInner.appendChild(wrap);
|
|
if (after) lineBInner.appendChild(document.createTextNode(after));
|
|
} else {
|
|
lineBInner.textContent = lineB;
|
|
}
|
|
stage.setAttribute("aria-label", lineA + " " + lineB);
|
|
|
|
// Deterministic character-count fit against the longer line; both
|
|
// lines are nowrap, so the fit keeps them inside the stage.
|
|
var characters = Math.max(1, Array.from(lineA).length, Array.from(lineB).length);
|
|
var fitted = Math.max(3.4, Math.min(9, 168 / characters));
|
|
root.style.setProperty("--ls-font-size", "min(" + fitted.toFixed(3) + "cqw, 16cqh)");
|
|
|
|
// RETIME RANGE: fixed phases; HOLD is the only elastic span.
|
|
var IN_A_BASE = 0.5;
|
|
var EXIT_A_BASE = 0.35;
|
|
var LAG_BASE = 0.22; // line_b starts this long after the beat
|
|
var IN_B_BASE = 0.5;
|
|
var UL_BEAT_BASE = 0.15;
|
|
var UL_BASE = underlineEl ? 0.45 : 0;
|
|
var OUT_BASE = exit === "none" ? 0 : 0.45;
|
|
var duration = Math.max(0.001, parseFloat(root.dataset.duration || "3.5"));
|
|
var swapSpanBase = LAG_BASE + IN_B_BASE;
|
|
var ulSpanBase = underlineEl ? UL_BEAT_BASE + UL_BASE : 0;
|
|
var totalBase = IN_A_BASE + swapSpanBase + ulSpanBase + OUT_BASE;
|
|
var scale = duration < totalBase ? duration / totalBase : 1;
|
|
var IN_A = IN_A_BASE * scale;
|
|
var EXIT_A = EXIT_A_BASE * scale;
|
|
var LAG = LAG_BASE * scale;
|
|
var IN_B = IN_B_BASE * scale;
|
|
var UL_BEAT = UL_BEAT_BASE * scale;
|
|
var UL = UL_BASE * scale;
|
|
var OUT = OUT_BASE * scale;
|
|
var OUT_START = duration - OUT;
|
|
|
|
var swapAtRaw = Number(vars.swap_at);
|
|
var swapAt = Number.isFinite(swapAtRaw) ? Math.max(0, swapAtRaw) : 1.5;
|
|
// line_a fully arrives before the beat; the swap and the
|
|
// underline always complete before the exit begins.
|
|
swapAt = Math.min(swapAt, Math.max(IN_A, OUT_START - (LAG + IN_B + UL_BEAT + UL)));
|
|
swapAt = Math.max(swapAt, IN_A);
|
|
var landB = swapAt + LAG + IN_B;
|
|
|
|
gsap.set(lineBEl, { yPercent: 115 });
|
|
if (underlineEl) gsap.set(underlineEl, { scaleX: 0 });
|
|
|
|
var tl = gsap.timeline({ paused: true });
|
|
|
|
// IN: line_a enters bottom-up through the mask. One move.
|
|
tl.fromTo(
|
|
lineAEl,
|
|
{ yPercent: 115 },
|
|
{ yPercent: 0, duration: IN_A, ease: "power4.out" },
|
|
0,
|
|
);
|
|
|
|
// SWAP: the beat replacement. line_a exits up through the mask as
|
|
// line_b slides in bottom-up. Single restrained slam, smooth ease.
|
|
tl.fromTo(
|
|
lineAEl,
|
|
{ yPercent: 0 },
|
|
{ yPercent: -115, duration: EXIT_A, ease: "power2.in", immediateRender: false },
|
|
swapAt,
|
|
);
|
|
tl.fromTo(
|
|
lineBEl,
|
|
{ yPercent: 115 },
|
|
{ yPercent: 0, duration: IN_B, ease: "power4.out" },
|
|
swapAt + LAG,
|
|
);
|
|
|
|
// UNDERLINE: accent bar draws left to right after line_b lands.
|
|
if (underlineEl) {
|
|
tl.fromTo(
|
|
underlineEl,
|
|
{ scaleX: 0 },
|
|
{ scaleX: 1, duration: UL, ease: "power2.out" },
|
|
landB + UL_BEAT,
|
|
);
|
|
}
|
|
|
|
// HOLD: completely still.
|
|
|
|
// OUT: optional departure; exit none holds until the frame cuts.
|
|
if (exit === "fade") {
|
|
tl.to(stage, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);
|
|
} else if (exit === "up") {
|
|
tl.to(stage, { opacity: 0, y: "-7cqh", duration: OUT, ease: "power2.in" }, OUT_START);
|
|
}
|
|
|
|
tl.seek(0);
|
|
window.__timelines = window.__timelines || {};
|
|
window.__timelines[compositionId] = tl;
|
|
})();
|
|
</script>
|
|
</div>
|
|
</template>
|
|
</body>
|
|
</html>
|
|
```
|
|
|
|
</Accordion>
|
|
|
|
{/* hf:generated-footer */}
|
|
|
|
Tagged `motion-primitive` `text-effects` `swap` `beat` `deterministic`.
|
|
|
|
## Related topics
|
|
|
|
- [Browse the complete Catalog](/catalog)
|
|
- [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
|
|
- [Build a richer composition](/go-further)
|