mirror of
https://github.com/heygen-com/hyperframes.git
synced 2026-09-01 19:42:03 +00:00
Miguel ÁngelandMiguel Angel Simon Sierra
1ae2067b8d
* 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>
780 lines
29 KiB
Plaintext
780 lines
29 KiB
Plaintext
---
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title: "Split-Flap Board"
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description: "Solari-style departure board: every cell walks its drum forward through the intervening characters of a fixed alphabet until it lands on its target, so the text resolves as a mechanical cascade instead of a fade."
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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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<VariablesExplorer
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previewSrc="/public/catalog/blocks/split-flap-board.json"
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compositionId="split-flap-board"
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compositionSrc="compositions/split-flap-board.html"
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variables={[{"id":"boardText","type":"string","label":"Board text","default":"NOW BOARDING","maxLength":24},{"id":"flapAlphabet","type":"string","label":"Flap alphabet (drum order)","default":" ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.,'","maxLength":64},{"id":"flipDuration","type":"number","label":"Seconds per flap","default":0.09,"min":0.03,"max":1.2,"step":0.01,"unit":"s"},{"id":"cellStagger","type":"number","label":"Per-cell start stagger","default":0.05,"min":0,"max":0.5,"step":0.01,"unit":"s"},{"id":"cellCount","type":"number","label":"Cells on the board","default":12,"min":1,"max":24,"step":1}]}
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>
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```html split-flap-board.html
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<!doctype html>
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<html
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lang="en"
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data-composition-variables='[
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{"id":"boardText","type":"string","label":"Board text","default":"NOW BOARDING","maxLength":24},
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{"id":"flapAlphabet","type":"string","label":"Flap alphabet (drum order)","default":" ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.,'","maxLength":64},
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{"id":"flipDuration","type":"number","label":"Seconds per flap","default":0.09,"min":0.03,"max":1.2,"step":0.01,"unit":"s"},
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{"id":"cellStagger","type":"number","label":"Per-cell start stagger","default":0.05,"min":0,"max":0.5,"step":0.01,"unit":"s"},
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{"id":"cellCount","type":"number","label":"Cells on the board","default":12,"min":1,"max":24,"step":1}
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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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<meta name="viewport" content="width=1920, height=1080" />
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<title>Split-Flap Board</title>
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<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
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<style>
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*,
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*::before,
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*::after {
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margin: 0;
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padding: 0;
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box-sizing: border-box;
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}
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html,
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body {
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width: 1920px;
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height: 1080px;
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overflow: hidden;
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background: transparent;
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}
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</style>
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</head>
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<body>
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<div
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id="sf-root"
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data-composition-id="split-flap-board"
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data-start="0"
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data-duration="3.5"
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data-fps="30"
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data-width="1920"
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data-height="1080"
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style="position: relative; width: 1920px; height: 1080px; overflow: hidden"
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>
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<style>
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/* The root's own box lives in an inline style, not a rule: every
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sub-composition rule is rewritten to
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`[data-composition-id="split-flap-board"] <selector>` at render,
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which can never match the root element itself. */
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#sf-bg {
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position: absolute;
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inset: 0;
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background:
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radial-gradient(120% 90% at 50% 42%, #23242a 0%, #121317 62%, #0a0a0c 100%), #0a0a0c;
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}
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#sf-board {
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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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}
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.sf-cell {
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position: relative;
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flex: 0 0 auto;
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perspective: 900px;
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border-radius: 9px;
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background: #0c0c0e;
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box-shadow:
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0 18px 34px rgba(0, 0, 0, 0.55),
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0 0 0 1px rgba(255, 255, 255, 0.05);
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}
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.sf-face {
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position: absolute;
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left: 0;
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width: 100%;
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height: 50%;
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overflow: hidden;
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background: linear-gradient(180deg, #26272c 0%, #1a1b1f 100%);
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}
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.sf-top,
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.sf-leaf-a {
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top: 0;
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border-radius: 9px 9px 0 0;
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}
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.sf-bot,
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.sf-leaf-b {
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top: 50%;
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border-radius: 0 0 9px 9px;
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background: linear-gradient(180deg, #191a1e 0%, #232429 100%);
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}
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.sf-leaf-a {
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transform-origin: 50% 100%;
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z-index: 3;
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backface-visibility: hidden;
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}
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.sf-leaf-b {
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transform-origin: 50% 0%;
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z-index: 3;
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backface-visibility: hidden;
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}
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.sf-glyph {
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position: absolute;
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left: 0;
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width: 100%;
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display: block;
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text-align: center;
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font-family: ui-monospace, monospace;
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font-weight: 700;
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color: #f4efe2;
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white-space: pre;
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}
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.sf-seam {
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position: absolute;
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left: 0;
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top: 50%;
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width: 100%;
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height: 3px;
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margin-top: -1.5px;
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background: #050506;
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z-index: 4;
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}
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</style>
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<div id="sf-bg"></div>
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<div id="sf-board" class="clip" data-start="0" data-duration="3.5" data-track-index="0"></div>
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<script>
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(function () {
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window.__timelines = window.__timelines || {};
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// ---------------------------------------------------------------
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// Reference numbers (see report / research entry F#1)
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//
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// Alphabet: the 40-position drum from the scottbez1/splitflap
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// project (Apache-2.0, README read) — blank, A-Z, 0-9, then `.,'`.
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// Drum order is what makes the cascade read as a real board: a cell
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// never jumps, it walks the drum forward through every intervening
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// character, so letters resolve early and digits/punctuation late.
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//
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// Flip duration: the only published-ish figure is a DIY firmware
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// proxy (28BYJ-48 stepper, ~83.59 steps/flap, a=500 steps/s^2 ->
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// triangular profile -> ~1.16 s/flap). That is a hobby build, NOT a
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// Solari spec, and real boards audibly flutter at tens of ms per
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// flap. The default below sits in that observed band; the DIY proxy
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// is still reachable at the top of the `flipDuration` range.
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//
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// Flap fall: constant angular acceleration through 180 degrees,
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// theta(p) = 180 * p^2. The flap therefore hangs near the top and
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// slaps down — no ease-out, because a falling leaf does not
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// decelerate. The two CSS leaves are the two faces of that one flap
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// (hand-off at theta = 90, i.e. p = 0.707).
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// ---------------------------------------------------------------
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var DEFAULT_ALPHABET = " ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.,'";
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var DEG = Math.PI / 180;
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function num(value, min, max, fallback) {
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var n = typeof value === "number" ? value : parseFloat(value);
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if (!isFinite(n)) return fallback;
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return Math.min(max, Math.max(min, n));
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}
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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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var alphabet = String(vars.flapAlphabet || DEFAULT_ALPHABET);
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if (alphabet.length < 2) alphabet = DEFAULT_ALPHABET;
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var N = alphabet.length;
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var flipDur = num(vars.flipDuration, 0.03, 1.2, 0.09);
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var stagger = num(vars.cellStagger, 0, 0.5, 0.05);
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var cellCount = Math.round(num(vars.cellCount, 1, 24, 12));
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var text = String(vars.boardText == null ? "NOW BOARDING" : vars.boardText)
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.toUpperCase()
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.slice(0, cellCount);
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// Centre the string across the board; unused cells stay on the
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// drum's first position (blank in the default alphabet).
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var lead = Math.floor((cellCount - text.length) / 2);
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var targets = [];
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for (var i = 0; i < cellCount; i++) {
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var ch =
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i >= lead && i < lead + text.length ? text.charAt(i - lead) : alphabet.charAt(0);
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var g = alphabet.indexOf(ch);
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targets.push(g < 0 ? 0 : g);
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}
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// Geometry: fit `cellCount` cells across 1920 with a 120px margin.
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var GAP = 10;
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var cw = Math.min(130, Math.floor((1920 - 240 - (cellCount - 1) * GAP) / cellCount));
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var chh = Math.round(cw * 1.45);
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var board = document.getElementById("sf-board");
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board.style.gap = GAP + "px";
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function makeFace(cls, glyphTop) {
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var face = document.createElement("div");
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face.className = "sf-face " + cls;
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var glyph = document.createElement("span");
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glyph.className = "sf-glyph";
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glyph.style.height = chh + "px";
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glyph.style.lineHeight = chh + "px";
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glyph.style.fontSize = Math.round(cw * 0.78) + "px";
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glyph.style.top = glyphTop + "px";
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face.appendChild(glyph);
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return face;
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}
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var cells = [];
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for (var c = 0; c < cellCount; c++) {
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var cell = document.createElement("div");
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cell.className = "sf-cell";
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cell.id = "sf-cell-" + c;
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cell.style.width = cw + "px";
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cell.style.height = chh + "px";
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// The mechanism IS clipped, stacked half-glyphs: each face holds a
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// whole character and shows half of it, and the falling leaf sits
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// on top of the face behind it. Declared intentional so the layout
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// auditor reports real regressions instead of the design.
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cell.setAttribute("data-layout-allow-overlap", "");
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cell.setAttribute("data-layout-allow-occlusion", "");
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cell.setAttribute("data-layout-allow-overflow", "");
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var top = makeFace("sf-top", 0);
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var bot = makeFace("sf-bot", -Math.round(chh / 2));
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var leafA = makeFace("sf-leaf-a", 0);
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var leafB = makeFace("sf-leaf-b", -Math.round(chh / 2));
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var seam = document.createElement("div");
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seam.className = "sf-seam";
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cell.appendChild(top);
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cell.appendChild(bot);
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cell.appendChild(leafA);
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cell.appendChild(leafB);
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cell.appendChild(seam);
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board.appendChild(cell);
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cells.push({
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// steps is unidirectional: the drum only ever spins forward,
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// start position is always the drum's first flap (index 0).
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steps: targets[c],
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top: top.firstChild,
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bot: bot.firstChild,
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leafA: leafA,
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leafB: leafB,
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glyphA: leafA.firstChild,
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glyphB: leafB.firstChild,
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});
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}
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// A face that is not in use must be wiped, not merely hidden.
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// Leaving a stale transform/filter/glyph on an opacity-0 leaf makes
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// the DOM (and, via layer promotion, the rasterised pixels) depend
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// on which frames were visited before this one — the exact failure
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// seeking is supposed to be immune to.
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function clearLeaf(leaf, glyph) {
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leaf.style.opacity = "0";
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leaf.style.transform = "";
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leaf.style.filter = "";
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glyph.textContent = "";
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}
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function showLeaf(leaf, glyph, char, angle, shade) {
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glyph.textContent = char;
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leaf.style.opacity = "1";
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leaf.style.transform = "rotateX(" + angle.toFixed(2) + "deg)";
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leaf.style.filter = "brightness(" + shade + ")";
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}
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// Pure function of absolute composition time. No accumulator, no
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// dependence on the previous frame — seeking to any t reconstructs
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// the whole board from t alone.
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function paint(t) {
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for (var i = 0; i < cells.length; i++) {
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var cell = cells[i];
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var tLocal = t - i * stagger;
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var raw = tLocal <= 0 ? 0 : tLocal / flipDur;
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var count = Math.floor(raw);
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var p = raw - count;
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if (count >= cell.steps) {
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count = cell.steps;
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p = 0;
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}
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var outgoing = alphabet.charAt(count % N);
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var incoming = alphabet.charAt((count + 1) % N);
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var flipping = count < cell.steps && p > 0;
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if (!flipping) {
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cell.top.textContent = outgoing;
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cell.bot.textContent = outgoing;
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clearLeaf(cell.leafA, cell.glyphA);
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clearLeaf(cell.leafB, cell.glyphB);
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continue;
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}
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// The new character is already seated behind the falling flap:
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// its top half shows, its bottom half is still hidden by the
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// outgoing flap lying in the lower slot.
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cell.top.textContent = incoming;
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cell.bot.textContent = outgoing;
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var theta = 180 * p * p;
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var shade = (1 - 0.5 * Math.sin(theta * DEG)).toFixed(3);
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if (theta < 90) {
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showLeaf(cell.leafA, cell.glyphA, outgoing, -theta, shade);
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clearLeaf(cell.leafB, cell.glyphB);
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} else {
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clearLeaf(cell.leafA, cell.glyphA);
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showLeaf(cell.leafB, cell.glyphB, incoming, 180 - theta, shade);
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}
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}
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}
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var duration = parseFloat(document.getElementById("sf-root").dataset.duration) || 8;
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// GSAP suppresses events on seek(), so onUpdate callbacks never fire
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// during a render. A property setter on the tweened driver always
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// runs, because GSAP writes the value itself.
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var driverTime = 0;
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var driver = {};
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Object.defineProperty(driver, "t", {
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configurable: true,
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get: function () {
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return driverTime;
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},
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set: function (value) {
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driverTime = value;
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paint(value);
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},
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});
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var tl = gsap.timeline({ paused: true });
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tl.to(driver, { t: duration, duration: duration, ease: "none" }, 0);
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paint(0);
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window.__timelines["split-flap-board"] = tl;
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})();
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</script>
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</div>
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</body>
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</html>
|
||
```
|
||
|
||
</VariablesExplorer>
|
||
|
||
## Install
|
||
|
||
<InstallCommand command="npx hyperframes add split-flap-board" item="split-flap-board" />
|
||
|
||
That writes one file: `compositions/split-flap-board.html`.
|
||
|
||
## Add it to your video
|
||
|
||
It runs for 3.5 seconds at 1920×1080. Paste this into your composition:
|
||
|
||
```html index.html
|
||
<div
|
||
data-composition-id="split-flap-board"
|
||
data-composition-src="compositions/split-flap-board.html"
|
||
data-start="0"
|
||
data-duration="3.5"
|
||
data-track-index="1"
|
||
data-width="1920"
|
||
data-height="1080"
|
||
></div>
|
||
```
|
||
|
||
Move it in time with `data-start`. Put it on a different timeline row with
|
||
`data-track-index`. See [data attributes](/concepts/data-attributes) for the rest.
|
||
|
||
## 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 |
|
||
| --- | --- | --- | --- |
|
||
| `boardText` | `NOW BOARDING` | string | |
|
||
| `flapAlphabet` | ` ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.,'` | string | |
|
||
| `flipDuration` | `0.09` | 0.03s to 1.2s, step 0.01s | |
|
||
| `cellStagger` | `0.05` | 0s to 0.5s, step 0.01s | |
|
||
| `cellCount` | `12` | 1 to 24, step 1 | |
|
||
|
||
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="split-flap-board"
|
||
data-composition-src="compositions/split-flap-board.html"
|
||
data-variable-values='{"boardText":"NOW BOARDING","flapAlphabet":" ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.,'","flipDuration":0.09,"cellStagger":0.05,"cellCount":12}'
|
||
></div>
|
||
```
|
||
|
||
## Source
|
||
|
||
<Accordion title={`split-flap-board.html`}>
|
||
|
||
```html
|
||
<!doctype html>
|
||
<html
|
||
lang="en"
|
||
data-composition-variables='[
|
||
{"id":"boardText","type":"string","label":"Board text","default":"NOW BOARDING","maxLength":24},
|
||
{"id":"flapAlphabet","type":"string","label":"Flap alphabet (drum order)","default":" ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.,'","maxLength":64},
|
||
{"id":"flipDuration","type":"number","label":"Seconds per flap","default":0.09,"min":0.03,"max":1.2,"step":0.01,"unit":"s"},
|
||
{"id":"cellStagger","type":"number","label":"Per-cell start stagger","default":0.05,"min":0,"max":0.5,"step":0.01,"unit":"s"},
|
||
{"id":"cellCount","type":"number","label":"Cells on the board","default":12,"min":1,"max":24,"step":1}
|
||
]'
|
||
>
|
||
<head>
|
||
<meta charset="UTF-8" />
|
||
<meta name="viewport" content="width=1920, height=1080" />
|
||
<title>Split-Flap Board</title>
|
||
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
|
||
<style>
|
||
*,
|
||
*::before,
|
||
*::after {
|
||
margin: 0;
|
||
padding: 0;
|
||
box-sizing: border-box;
|
||
}
|
||
html,
|
||
body {
|
||
width: 1920px;
|
||
height: 1080px;
|
||
overflow: hidden;
|
||
background: transparent;
|
||
}
|
||
</style>
|
||
</head>
|
||
<body>
|
||
<div
|
||
id="sf-root"
|
||
data-composition-id="split-flap-board"
|
||
data-start="0"
|
||
data-duration="3.5"
|
||
data-fps="30"
|
||
data-width="1920"
|
||
data-height="1080"
|
||
style="position: relative; width: 1920px; height: 1080px; overflow: hidden"
|
||
>
|
||
<style>
|
||
/* The root's own box lives in an inline style, not a rule: every
|
||
sub-composition rule is rewritten to
|
||
`[data-composition-id="split-flap-board"] <selector>` at render,
|
||
which can never match the root element itself. */
|
||
#sf-bg {
|
||
position: absolute;
|
||
inset: 0;
|
||
background:
|
||
radial-gradient(120% 90% at 50% 42%, #23242a 0%, #121317 62%, #0a0a0c 100%), #0a0a0c;
|
||
}
|
||
#sf-board {
|
||
position: absolute;
|
||
inset: 0;
|
||
display: flex;
|
||
align-items: center;
|
||
justify-content: center;
|
||
}
|
||
.sf-cell {
|
||
position: relative;
|
||
flex: 0 0 auto;
|
||
perspective: 900px;
|
||
border-radius: 9px;
|
||
background: #0c0c0e;
|
||
box-shadow:
|
||
0 18px 34px rgba(0, 0, 0, 0.55),
|
||
0 0 0 1px rgba(255, 255, 255, 0.05);
|
||
}
|
||
.sf-face {
|
||
position: absolute;
|
||
left: 0;
|
||
width: 100%;
|
||
height: 50%;
|
||
overflow: hidden;
|
||
background: linear-gradient(180deg, #26272c 0%, #1a1b1f 100%);
|
||
}
|
||
.sf-top,
|
||
.sf-leaf-a {
|
||
top: 0;
|
||
border-radius: 9px 9px 0 0;
|
||
}
|
||
.sf-bot,
|
||
.sf-leaf-b {
|
||
top: 50%;
|
||
border-radius: 0 0 9px 9px;
|
||
background: linear-gradient(180deg, #191a1e 0%, #232429 100%);
|
||
}
|
||
.sf-leaf-a {
|
||
transform-origin: 50% 100%;
|
||
z-index: 3;
|
||
backface-visibility: hidden;
|
||
}
|
||
.sf-leaf-b {
|
||
transform-origin: 50% 0%;
|
||
z-index: 3;
|
||
backface-visibility: hidden;
|
||
}
|
||
.sf-glyph {
|
||
position: absolute;
|
||
left: 0;
|
||
width: 100%;
|
||
display: block;
|
||
text-align: center;
|
||
font-family: ui-monospace, monospace;
|
||
font-weight: 700;
|
||
color: #f4efe2;
|
||
white-space: pre;
|
||
}
|
||
.sf-seam {
|
||
position: absolute;
|
||
left: 0;
|
||
top: 50%;
|
||
width: 100%;
|
||
height: 3px;
|
||
margin-top: -1.5px;
|
||
background: #050506;
|
||
z-index: 4;
|
||
}
|
||
</style>
|
||
|
||
<div id="sf-bg"></div>
|
||
<div id="sf-board" class="clip" data-start="0" data-duration="3.5" data-track-index="0"></div>
|
||
|
||
<script>
|
||
(function () {
|
||
window.__timelines = window.__timelines || {};
|
||
|
||
// ---------------------------------------------------------------
|
||
// Reference numbers (see report / research entry F#1)
|
||
//
|
||
// Alphabet: the 40-position drum from the scottbez1/splitflap
|
||
// project (Apache-2.0, README read) — blank, A-Z, 0-9, then `.,'`.
|
||
// Drum order is what makes the cascade read as a real board: a cell
|
||
// never jumps, it walks the drum forward through every intervening
|
||
// character, so letters resolve early and digits/punctuation late.
|
||
//
|
||
// Flip duration: the only published-ish figure is a DIY firmware
|
||
// proxy (28BYJ-48 stepper, ~83.59 steps/flap, a=500 steps/s^2 ->
|
||
// triangular profile -> ~1.16 s/flap). That is a hobby build, NOT a
|
||
// Solari spec, and real boards audibly flutter at tens of ms per
|
||
// flap. The default below sits in that observed band; the DIY proxy
|
||
// is still reachable at the top of the `flipDuration` range.
|
||
//
|
||
// Flap fall: constant angular acceleration through 180 degrees,
|
||
// theta(p) = 180 * p^2. The flap therefore hangs near the top and
|
||
// slaps down — no ease-out, because a falling leaf does not
|
||
// decelerate. The two CSS leaves are the two faces of that one flap
|
||
// (hand-off at theta = 90, i.e. p = 0.707).
|
||
// ---------------------------------------------------------------
|
||
var DEFAULT_ALPHABET = " ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789.,'";
|
||
var DEG = Math.PI / 180;
|
||
|
||
function num(value, min, max, fallback) {
|
||
var n = typeof value === "number" ? value : parseFloat(value);
|
||
if (!isFinite(n)) return fallback;
|
||
return Math.min(max, Math.max(min, n));
|
||
}
|
||
|
||
var vars =
|
||
window.__hyperframes && window.__hyperframes.getVariables
|
||
? window.__hyperframes.getVariables()
|
||
: {};
|
||
|
||
var alphabet = String(vars.flapAlphabet || DEFAULT_ALPHABET);
|
||
if (alphabet.length < 2) alphabet = DEFAULT_ALPHABET;
|
||
var N = alphabet.length;
|
||
|
||
var flipDur = num(vars.flipDuration, 0.03, 1.2, 0.09);
|
||
var stagger = num(vars.cellStagger, 0, 0.5, 0.05);
|
||
var cellCount = Math.round(num(vars.cellCount, 1, 24, 12));
|
||
|
||
var text = String(vars.boardText == null ? "NOW BOARDING" : vars.boardText)
|
||
.toUpperCase()
|
||
.slice(0, cellCount);
|
||
// Centre the string across the board; unused cells stay on the
|
||
// drum's first position (blank in the default alphabet).
|
||
var lead = Math.floor((cellCount - text.length) / 2);
|
||
var targets = [];
|
||
for (var i = 0; i < cellCount; i++) {
|
||
var ch =
|
||
i >= lead && i < lead + text.length ? text.charAt(i - lead) : alphabet.charAt(0);
|
||
var g = alphabet.indexOf(ch);
|
||
targets.push(g < 0 ? 0 : g);
|
||
}
|
||
|
||
// Geometry: fit `cellCount` cells across 1920 with a 120px margin.
|
||
var GAP = 10;
|
||
var cw = Math.min(130, Math.floor((1920 - 240 - (cellCount - 1) * GAP) / cellCount));
|
||
var chh = Math.round(cw * 1.45);
|
||
|
||
var board = document.getElementById("sf-board");
|
||
board.style.gap = GAP + "px";
|
||
|
||
function makeFace(cls, glyphTop) {
|
||
var face = document.createElement("div");
|
||
face.className = "sf-face " + cls;
|
||
var glyph = document.createElement("span");
|
||
glyph.className = "sf-glyph";
|
||
glyph.style.height = chh + "px";
|
||
glyph.style.lineHeight = chh + "px";
|
||
glyph.style.fontSize = Math.round(cw * 0.78) + "px";
|
||
glyph.style.top = glyphTop + "px";
|
||
face.appendChild(glyph);
|
||
return face;
|
||
}
|
||
|
||
var cells = [];
|
||
for (var c = 0; c < cellCount; c++) {
|
||
var cell = document.createElement("div");
|
||
cell.className = "sf-cell";
|
||
cell.id = "sf-cell-" + c;
|
||
cell.style.width = cw + "px";
|
||
cell.style.height = chh + "px";
|
||
// The mechanism IS clipped, stacked half-glyphs: each face holds a
|
||
// whole character and shows half of it, and the falling leaf sits
|
||
// on top of the face behind it. Declared intentional so the layout
|
||
// auditor reports real regressions instead of the design.
|
||
cell.setAttribute("data-layout-allow-overlap", "");
|
||
cell.setAttribute("data-layout-allow-occlusion", "");
|
||
cell.setAttribute("data-layout-allow-overflow", "");
|
||
|
||
var top = makeFace("sf-top", 0);
|
||
var bot = makeFace("sf-bot", -Math.round(chh / 2));
|
||
var leafA = makeFace("sf-leaf-a", 0);
|
||
var leafB = makeFace("sf-leaf-b", -Math.round(chh / 2));
|
||
|
||
var seam = document.createElement("div");
|
||
seam.className = "sf-seam";
|
||
|
||
cell.appendChild(top);
|
||
cell.appendChild(bot);
|
||
cell.appendChild(leafA);
|
||
cell.appendChild(leafB);
|
||
cell.appendChild(seam);
|
||
board.appendChild(cell);
|
||
|
||
cells.push({
|
||
// steps is unidirectional: the drum only ever spins forward,
|
||
// start position is always the drum's first flap (index 0).
|
||
steps: targets[c],
|
||
top: top.firstChild,
|
||
bot: bot.firstChild,
|
||
leafA: leafA,
|
||
leafB: leafB,
|
||
glyphA: leafA.firstChild,
|
||
glyphB: leafB.firstChild,
|
||
});
|
||
}
|
||
|
||
// A face that is not in use must be wiped, not merely hidden.
|
||
// Leaving a stale transform/filter/glyph on an opacity-0 leaf makes
|
||
// the DOM (and, via layer promotion, the rasterised pixels) depend
|
||
// on which frames were visited before this one — the exact failure
|
||
// seeking is supposed to be immune to.
|
||
function clearLeaf(leaf, glyph) {
|
||
leaf.style.opacity = "0";
|
||
leaf.style.transform = "";
|
||
leaf.style.filter = "";
|
||
glyph.textContent = "";
|
||
}
|
||
|
||
function showLeaf(leaf, glyph, char, angle, shade) {
|
||
glyph.textContent = char;
|
||
leaf.style.opacity = "1";
|
||
leaf.style.transform = "rotateX(" + angle.toFixed(2) + "deg)";
|
||
leaf.style.filter = "brightness(" + shade + ")";
|
||
}
|
||
|
||
// Pure function of absolute composition time. No accumulator, no
|
||
// dependence on the previous frame — seeking to any t reconstructs
|
||
// the whole board from t alone.
|
||
function paint(t) {
|
||
for (var i = 0; i < cells.length; i++) {
|
||
var cell = cells[i];
|
||
var tLocal = t - i * stagger;
|
||
var raw = tLocal <= 0 ? 0 : tLocal / flipDur;
|
||
var count = Math.floor(raw);
|
||
var p = raw - count;
|
||
if (count >= cell.steps) {
|
||
count = cell.steps;
|
||
p = 0;
|
||
}
|
||
|
||
var outgoing = alphabet.charAt(count % N);
|
||
var incoming = alphabet.charAt((count + 1) % N);
|
||
var flipping = count < cell.steps && p > 0;
|
||
|
||
if (!flipping) {
|
||
cell.top.textContent = outgoing;
|
||
cell.bot.textContent = outgoing;
|
||
clearLeaf(cell.leafA, cell.glyphA);
|
||
clearLeaf(cell.leafB, cell.glyphB);
|
||
continue;
|
||
}
|
||
|
||
// The new character is already seated behind the falling flap:
|
||
// its top half shows, its bottom half is still hidden by the
|
||
// outgoing flap lying in the lower slot.
|
||
cell.top.textContent = incoming;
|
||
cell.bot.textContent = outgoing;
|
||
|
||
var theta = 180 * p * p;
|
||
var shade = (1 - 0.5 * Math.sin(theta * DEG)).toFixed(3);
|
||
if (theta < 90) {
|
||
showLeaf(cell.leafA, cell.glyphA, outgoing, -theta, shade);
|
||
clearLeaf(cell.leafB, cell.glyphB);
|
||
} else {
|
||
clearLeaf(cell.leafA, cell.glyphA);
|
||
showLeaf(cell.leafB, cell.glyphB, incoming, 180 - theta, shade);
|
||
}
|
||
}
|
||
}
|
||
|
||
var duration = parseFloat(document.getElementById("sf-root").dataset.duration) || 8;
|
||
|
||
// GSAP suppresses events on seek(), so onUpdate callbacks never fire
|
||
// during a render. A property setter on the tweened driver always
|
||
// runs, because GSAP writes the value itself.
|
||
var driverTime = 0;
|
||
var driver = {};
|
||
Object.defineProperty(driver, "t", {
|
||
configurable: true,
|
||
get: function () {
|
||
return driverTime;
|
||
},
|
||
set: function (value) {
|
||
driverTime = value;
|
||
paint(value);
|
||
},
|
||
});
|
||
|
||
var tl = gsap.timeline({ paused: true });
|
||
tl.to(driver, { t: duration, duration: duration, ease: "none" }, 0);
|
||
|
||
paint(0);
|
||
|
||
window.__timelines["split-flap-board"] = tl;
|
||
})();
|
||
</script>
|
||
</div>
|
||
</body>
|
||
</html>
|
||
```
|
||
|
||
</Accordion>
|
||
|
||
{/* hf:generated-footer */}
|
||
|
||
Tagged `text` `kinetic` `mechanical` `split-flap` `solari` `departure-board` `reveal`.
|
||
|
||
## Related topics
|
||
|
||
- [Browse the complete Catalog](/catalog)
|
||
- [Add assets and Catalog items in Studio](/studio/assets-and-blocks)
|
||
- [Build a richer composition](/go-further)
|