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hyperframes/docs/catalog/components/stitched-text-draw.mdx
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Miguel ÁngelandMiguel Angel Simon Sierra 1ae2067b8d feat(catalog): put the variables panel back, on payloads (#3199) 
* feat(catalog): put the variables panel back, on payloads

The panel drove its preview by loading an .html from docs/public, a type the
host does not publish, so it showed an empty frame in production and was
parked when the catalog was re-landed.

It now mounts the same JSON payload the plain player uses and re-mounts it as
values change, injecting them as window.__hfVariables into the composition head
before any of its scripts run, which is where the runtime reads overrides from.
Doing it in the markup rather than after load is what stops the composition
initialising with the wrong values first.

172 items with variables get the panel back; the playhead carries across a
change so a tweak mid-shot does not jump back to frame zero.

* fix(docs): drop the unused url form and the needless escapes

* fix(docs): the panel cannot reference a binding beside the export

* feat(catalog): make importing an SVG the obvious move

A reader arrives at this control with a shape, not with path data, and the
panel asked for the coordinates first. Import is now the primary action in a
drop target you can see is a drop target, and the raw path sits behind a
disclosure for anyone who wants it.

* feat(cli): let a fruitless catalog search report the gap

An agent that searches by meaning and finds nothing worth installing knows
something we do not: the name of a move the catalog is missing. There was no
way to tell us, so that knowledge was lost at the end of every run.

hyperframes feedback --search-miss "<query>" --wanted "<the move>" records it.
It carries no rating, so it never lands in the rating metric, and it is a
separate deliberate command rather than something catalog --query does on its
own: plain search still sends nothing, which is what the CLI promises.

--rating stops being required at the arg level, since a miss has no rating to
give. The check moved into the run body, where an absent one is now handled
rather than crashing on undefined.

* feat(cli): carry tuned variable values into the install snippet

Someone who tunes a block on its catalog page had no way to keep those values:
the install command was the same one everybody gets, and the tuning stayed on
the page.

hyperframes add <item> --vars '<json>' now prints a mount element carrying
data-variable-values, so the values land where the block is used.

They ride on the host rather than being written into the installed file. That
keeps the composition on disk byte-identical to the registry's, so a later
reinstall can still tell an edit from an update, and it lets two mounts of the
same block carry different values.

* fix(catalog): serve the item's own directory so runtime paths resolve

Some compositions assemble their asset URLs at run time —
"compositions/components/" + texture + ".png" for the texture masks, a font the
compiler pulled into _remote_media — and no scan of the markup can see a string
that does not exist until a script concatenates it. Those items either rendered
black or were dropped to a video that had never been uploaded.

Each item that needs it now has its prepared directory published, and its
payload carries a <base> pointing at it, so any relative path the composition
invents resolves. caption-texture renders its masks again, and
variable-font-flex has a preview at all for the first time: its MP4 and poster
are both 403.

Both layouts are published, because which one a composition asks for differs
per item, and a directory only earns that if it is under 2 MB. The 12 MB
texture sheet keeps the recorded video it already had.

* fix(catalog): let the variables panel actually drive the composition

Every control on the panel was inert. The values reached the composition and
nothing repainted, because the payload had already been compiled: compiling
inlines a mounted component and resolves its variables into the markup and CSS,
so by the time a reader turns a knob there is nothing left to change.

An item that declares variables now ships uncompiled, keeping the mount the
runtime loads at run time, which is the only state where data-variable-values
still means anything. The component travels inline as a data URI rather than a
sibling file, because .html is the one type the docs host will not publish. The
demo's own pinned values come off, so the reader's choices reach the mount
instead of losing to the values the demo picked to show itself off.

Measured on the rendered frame rather than the DOM: green rgb(98,207,144),
blue rgb(6,6,199), violet rgb(177,147,230), and back to green.

docs/public/catalog drops from 48 MB to 35 MB along the way, since an
uncompiled payload carries far less than an inlined one.

* feat(catalog): keep variable changes in the url

A reader who tuned a piece lost it on reload, and had nothing to send anyone.
The values now live in the query string, scoped by composition id so two links
never read each other,and only the ones that differ from the defaults are
written, so changing one knob gives a short URL rather than every variable
spelled out.

replaceState rather than pushState: dragging a slider should not leave a trail
of history entries. An unreadable value is ignored rather than thrown, so a
truncated or hand-edited link opens the piece at its defaults.

* fix(catalog): only rewrite the url when a value actually changed

* refactor(catalog): memoise the declared defaults on their content

* feat(catalog): offer an install command carrying the tuned values

The Install block is generated before anyone touches a knob, so it can only
ever print the plain command. Someone who spent a minute tuning a piece copied
it and got the defaults back.

The panel now carries its own command in the Snippet tab, with --vars holding
exactly the values that differ. An untouched piece still offers the same short
command, so nothing gets noisier for the common case.

* fix(catalog): a piece with nothing to render is a skip, not a failure

caption-blend-difference is a stylesheet and a paragraph of prose — a class you
add to your own captions, with no standalone scene to show. The generator
treated that as a build failure, so every run ended by reporting something
broken when nothing was.

It now reports the shape it is and keeps its recorded video, which is the only
honest preview such an item has. A genuine render failure still throws.

* fix(catalog): restore variables from the url on a cold load

A shared link opened at the defaults. The first render happens on the server,
where there is no window to read the query string from, and React then hydrates
against that markup and never revisits it — so the values only appeared once you
touched a control.

The URL is read again after mount, which is the first moment it exists. The
value is also escaped once now rather than twice: URLSearchParams already
decodes on the way out, and decoding a second time turned an SVG path full of
percent-escapes into something that no longer parsed, besides doubling the
length of every link.

* fix(catalog): mount the preview with the values a link carried

The frame was built from the declared defaults and the shared values were
posted to it afterwards, which is too late for anything the composition reads
once at init: a path arrived after the mark had already been drawn from the
default one, so a link looked right in the panel and wrong on screen.

* feat(catalog): the install command follows the values you tuned

Copying the Install line gave the plain command back, because that block is
generated before anyone touches a knob and had no way to know what changed. The
tuned command only existed in the panel Snippet tab, which is not where anyone
looks for it.

The line now reads the same query string the panel writes, so the two agree
without either component knowing the other exists, and a shared link carries the
right command too. replaceState fires no event, so the panel announces its own
writes.

* fix(catalog): send a text variable to the preview once it is finished

Every other control in the explorer reports a whole value on every event: a
slider at any position is a position, a swatch is a colour. A text field is
not. Typing v3 into a badge posted v first, so the preview remounted and
rendered a composition built from half a word.

The post now waits while a text field has focus and goes out when the edit is
committed, with Enter or by clicking away. The field itself is unchanged and
still tracks every keystroke.

---------

Co-authored-by: Miguel Angel Simon Sierra <miguelangelsi07@gmail.com>
2026-08-10 22:40:01 -04:00

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---
title: "Stitched Text Draw"
description: "Text drawn as thread stitches: a single-stroke display alphabet draws via attribute-driven dashoffset with stitch-tuned dash patterns, seeded angle jitter, needle-hole dots, a leading needle, and a thread-tail overshoot per letter."
---
import { InstallCommand } from "/snippets/install-command.jsx";
import { VariablesExplorer } from "/snippets/variables-explorer.jsx";
<VariablesExplorer
previewSrc="/public/catalog/components/stitched-text-draw.json"
compositionId="stitched-text-draw"
compositionSrc="compositions/components/stitched-text-draw.html"
variables={[{"id":"text","type":"string","role":"content","label":"Text","description":"Uppercased A-Z 0-9 and space, clamped to 12 characters.","default":"STITCH"},{"id":"stitch","type":"enum","role":"style","label":"Stitch","description":"Dash/gap scale, thread width, and jitter amplitude.","default":"fine","options":[{"value":"fine","label":"Fine"},{"value":"coarse","label":"Coarse"}]},{"id":"accent","type":"enum","role":"style","label":"Accent","description":"Thread color: green rides --brand, blue rides --accent, violet rides --accent-2.","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 stitched word holds until the frame cuts.","default":"none","options":[{"value":"none","label":"None"},{"value":"fade","label":"Fade"},{"value":"up","label":"Up"}]}]}
>
```html stitched-text-draw.html
<!doctype html>
<!--
stitched-text-draw: HyperFrames video primitive (type / craft, Wave M
experiment M6)
Text drawn as thread stitches. Letters come from a single-stroke display
alphabet (A-Z 0-9) authored as a compact stroke table of lines and
elliptical arcs per glyph, flattened to polylines at mount, resampled to
stitch-scale steps, and displaced by seeded perpendicular jitter so every
stitch sits at a slightly different angle (hand-sewn wobble). Each stroke
draws thread-first: a needle dot leads the reveal front, needle-hole dots
appear at every stitch boundary behind it, and each letter finishes with
a tiny thread-tail overshoot (the thread sticks out past the stroke end
along its exit tangent, then is pulled snug).
Draw mechanic (gotcha 8, and gotcha "nested SVG mask doesn't repaint
under seek"): the reveal is ATTRIBUTE-driven stroke-dashoffset on the
stitched path itself, using the double-dash trick instead of an SVG mask.
Each path's dasharray is its stitch pattern (dash, gap, dash, ...) built
to sum EXACTLY to the path length L, followed by one closing gap of L
(total 2L). Animating the stroke-dashoffset attribute from L to 0 sweeps
the reveal front from start to end while the visible dashes settle into
their final stitch positions at offset 0. No <mask>, no <clipPath>, no
CSS dashoffset property (Chrome under-invalidates it on reverse seeks);
the painter primes and updates the attribute via setAttribute.
Variables (declared in data-composition-variables below):
- text (string, default "STITCH"): uppercased; A-Z 0-9 and space,
other characters render as spaces; clamped to 12 characters.
- stitch ("fine" | "coarse", default "fine"): dash/gap scale, thread
width, and jitter amplitude.
- accent ("green" | "blue" | "violet", default "green"): thread color;
green rides --brand, blue rides --accent, violet rides --accent-2.
- exit ("none" | "fade" | "up", default "none").
Envelope, fixed IN and OUT with elastic HOLD only (never timeScale):
IN_BASE = 0.15 lead + 2.9 draw + 0.15 margin
HOLD = max(0, D - IN - OUT), truly still
OUT_BASE = 0.45s only when exit != none
If D < IN_BASE + OUT_BASE the whole envelope compresses together.
Letters draw strictly in sequence; each letter's share of the draw
window is proportional to its total stroke length, with a fixed
needle-jump pause between letters.
Determinism and seek-safety: all geometry, jitter (fixed LCG seed
0x57174c3d), stitch patterns, hole positions, and the per-stroke draw
schedule are computed once at mount. One inert anchor tween spans [0, D];
a painter recomputes every stroke's dashoffset, every hole's visibility,
and the needle/tail pose as pure functions of tl.time() on each update
(zero per-element tweens, gotcha 9). Writes are idempotent; eventful
seeks (suppressEvents=false) land identical frames in any order and
either direction.
Mount contract: the runtime clones only this template. #root fills the
host box (no data-width/data-height, container-type: size, cqmin units),
is styled via #root only, and registers one paused timeline under the
LITERAL "stitched-text-draw" key. getTotalLength drives all dash math
(never the pathLength attribute, never non-scaling-stroke on dashed
paths).
-->
<html
lang="en"
data-composition-id="stitched-text-draw"
data-composition-duration="4"
data-composition-variables='[
{ "id": "text", "type": "string", "role": "content", "label": "Text", "description": "Uppercased A-Z 0-9 and space, clamped to 12 characters.", "default": "STITCH" },
{ "id": "stitch", "type": "enum", "role": "style", "label": "Stitch", "description": "Dash/gap scale, thread width, and jitter amplitude.", "default": "fine", "options": [{ "value": "fine", "label": "Fine" }, { "value": "coarse", "label": "Coarse" }] },
{ "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Thread color: green rides --brand, blue rides --accent, violet rides --accent-2.", "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 stitched word 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>Stitched Text Draw</title>
</head>
<body>
<template>
<div id="root" data-composition-id="stitched-text-draw" data-duration="4" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
#root {
position: absolute;
inset: 0;
overflow: hidden;
container-type: size;
isolation: isolate;
color: var(--fg, #f8fafc);
font-family: var(--font-display, system-ui, sans-serif);
pointer-events: none;
}
.std-clip {
position: absolute;
inset: 0;
display: grid;
place-items: center;
overflow: hidden;
background: var(--bg, transparent);
}
.std-stage {
display: grid;
place-items: center;
will-change: transform, opacity;
}
.std-svg {
display: block;
width: 92cqw;
height: 56cqh;
}
</style>
<div
id="stitched-text-draw-clip"
class="std-clip clip"
data-start="0"
data-duration="4"
data-track-index="0"
>
<div class="std-stage" role="img">
<svg
class="std-svg"
xmlns="http://www.w3.org/2000/svg"
preserveAspectRatio="xMidYMid meet"
aria-hidden="true"
></svg>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<script>
(function () {
"use strict";
var SVG_NS = "http://www.w3.org/2000/svg";
var root = document.getElementById("root");
var stage = root.querySelector(".std-stage");
var svg = root.querySelector(".std-svg");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var text = (vars.text == null || vars.text === "" ? "STITCH" : String(vars.text))
.toUpperCase()
.slice(0, 12);
var stitch = vars.stitch === "coarse" ? "coarse" : "fine";
// Each enum choice routes to a DIFFERENT contract token so the
// variable stays meaningful under a theme.
var accentColors = {
green: "var(--brand, #52525b)",
blue: "var(--accent, #52525b)",
violet: "var(--accent-2, #52525b)",
};
var accent = Object.prototype.hasOwnProperty.call(accentColors, vars.accent)
? vars.accent
: "green";
var exit = vars.exit === "fade" || vars.exit === "up" ? vars.exit : "none";
root.style.setProperty("--std-accent", accentColors[accent]);
stage.setAttribute("aria-label", text);
// Stitch registers: dash/gap in glyph units (glyph box 70x100).
var registers = {
fine: { dash: 6.5, gap: 4.5, width: 2.6, jitter: 1.5 },
coarse: { dash: 10, gap: 7, width: 4.2, jitter: 2.3 },
};
var reg = registers[stitch];
// ---- Single-stroke display alphabet -------------------------
// Glyph box: width 70 (space 40), cap height 100, y down.
// Each glyph is an array of strokes; a stroke is an array of
// [x, y] points (lines) built from line points and flattened
// elliptical arcs. Curves only need enough samples to read as
// curved once resampled and jittered.
function arcPts(cx, cy, rx, ry, a0, a1) {
var steps = Math.max(6, Math.ceil(Math.abs(a1 - a0) / 18));
var pts = [];
for (var i = 0; i <= steps; i += 1) {
var a = ((a0 + ((a1 - a0) * i) / steps) * Math.PI) / 180;
pts.push([cx + rx * Math.cos(a), cy + ry * Math.sin(a)]);
}
return pts;
}
function join() {
var out = [];
for (var i = 0; i < arguments.length; i += 1) {
out = out.concat(arguments[i]);
}
return out;
}
var GLYPHS = {
A: [
[
[4, 100],
[35, 2],
[66, 100],
],
[
[15, 64],
[55, 64],
],
],
B: [
[
[6, 2],
[6, 98],
],
join([[6, 2]], arcPts(36, 26, 24, 24, -90, 90), [[6, 50]]),
join([[6, 50]], arcPts(38, 74, 26, 24, -90, 90), [[6, 98]]),
],
C: [arcPts(38, 50, 30, 46, -60, -300)],
D: [
join(
[
[6, 2],
[24, 2],
],
arcPts(24, 50, 40, 48, -90, 90),
[
[24, 98],
[6, 98],
[6, 4],
],
),
],
E: [
[
[60, 2],
[8, 2],
[8, 98],
[60, 98],
],
[
[8, 50],
[48, 50],
],
],
F: [
[
[60, 2],
[8, 2],
[8, 98],
],
[
[8, 50],
[46, 50],
],
],
G: [
join(arcPts(38, 50, 30, 46, -60, -305), [
[56, 62],
[38, 62],
]),
],
H: [
[
[8, 2],
[8, 98],
],
[
[62, 2],
[62, 98],
],
[
[8, 50],
[62, 50],
],
],
I: [
[
[35, 2],
[35, 98],
],
[
[20, 2],
[50, 2],
],
[
[20, 98],
[50, 98],
],
],
J: [
join(
[
[58, 2],
[58, 72],
],
arcPts(33, 72, 25, 26, 0, 180),
),
],
K: [
[
[8, 2],
[8, 98],
],
[
[60, 2],
[8, 56],
],
[
[24, 42],
[62, 98],
],
],
L: [
[
[8, 2],
[8, 98],
[60, 98],
],
],
M: [
[
[6, 98],
[6, 2],
[35, 58],
[64, 2],
[64, 98],
],
],
N: [
[
[8, 98],
[8, 2],
[62, 98],
[62, 2],
],
],
O: [arcPts(35, 50, 30, 47, -90, 270)],
P: [
[
[8, 98],
[8, 2],
],
join(
[
[8, 2],
[36, 2],
],
arcPts(36, 27, 26, 25, -90, 90),
[
[36, 52],
[8, 52],
],
),
],
Q: [
arcPts(35, 50, 30, 47, -90, 270),
[
[46, 70],
[66, 96],
],
],
R: [
[
[8, 98],
[8, 2],
],
join(
[
[8, 2],
[36, 2],
],
arcPts(36, 27, 26, 25, -90, 90),
[
[36, 52],
[8, 52],
],
),
[
[30, 52],
[64, 98],
],
],
S: [
[
[58, 14],
[44, 3],
[24, 3],
[10, 14],
[10, 30],
[24, 42],
[46, 56],
[58, 68],
[58, 86],
[44, 97],
[22, 97],
[8, 86],
],
],
T: [
[
[6, 2],
[64, 2],
],
[
[35, 2],
[35, 98],
],
],
U: [
join(
[
[8, 2],
[8, 68],
],
arcPts(35, 68, 27, 29, 180, 360),
[
[62, 68],
[62, 2],
],
),
],
V: [
[
[6, 2],
[35, 98],
[64, 2],
],
],
W: [
[
[4, 2],
[19, 98],
[35, 34],
[51, 98],
[66, 2],
],
],
X: [
[
[8, 2],
[62, 98],
],
[
[62, 2],
[8, 98],
],
],
Y: [
[
[6, 2],
[35, 50],
],
[
[64, 2],
[35, 50],
[35, 98],
],
],
Z: [
[
[8, 2],
[62, 2],
[8, 98],
[62, 98],
],
],
0: [arcPts(35, 50, 27, 47, -90, 270)],
1: [
[
[20, 20],
[38, 4],
[38, 98],
],
],
2: [
join(arcPts(35, 26, 26, 24, -160, 10), [
[8, 98],
[62, 98],
]),
],
3: [join(arcPts(34, 26, 24, 24, -150, 80), arcPts(36, 73, 26, 25, -100, 150))],
4: [
[
[50, 2],
[6, 66],
[66, 66],
],
[
[50, 44],
[50, 98],
],
],
5: [
[
[58, 3],
[14, 3],
[11, 44],
[34, 38],
[55, 48],
[59, 72],
[46, 94],
[20, 96],
[8, 84],
],
],
6: [
join(
[
[52, 4],
[28, 26],
[13, 56],
],
arcPts(35, 72, 24, 26, -180, 180),
),
],
7: [
[
[8, 3],
[62, 3],
[30, 98],
],
],
8: [join(arcPts(35, 27, 21, 24, 90, 450), arcPts(35, 74, 26, 25, -90, 270))],
9: [
join(arcPts(37, 28, 25, 25, 0, 360), [
[62, 28],
[56, 64],
[34, 98],
]),
],
};
var GLYPH_W = 70;
var SPACE_W = 40;
var GAP = 24;
// Fixed-seed LCG: the only randomness source, consumed in one
// deterministic order during this build phase.
var lcgState = 0x57174c3d;
function next() {
lcgState = (Math.imul(1664525, lcgState) + 1013904223) >>> 0;
return lcgState / 4294967296;
}
// Resample a polyline to even stitch-scale steps, then displace
// each point perpendicular to the local direction: seeded angle
// jitter, so every stitch lands at a slightly different angle.
function resampleJitter(points) {
var STEP = 5;
var flat = [points[0]];
for (var i = 1; i < points.length; i += 1) {
var ax = flat[flat.length - 1][0];
var ay = flat[flat.length - 1][1];
var bx = points[i][0];
var by = points[i][1];
var seg = Math.hypot(bx - ax, by - ay);
var n = Math.max(1, Math.round(seg / STEP));
for (var k = 1; k <= n; k += 1) {
flat.push([ax + ((bx - ax) * k) / n, ay + ((by - ay) * k) / n]);
}
}
var out = [];
for (var p = 0; p < flat.length; p += 1) {
var prev = flat[Math.max(0, p - 1)];
var after = flat[Math.min(flat.length - 1, p + 1)];
var dx = after[0] - prev[0];
var dy = after[1] - prev[1];
var len = Math.hypot(dx, dy) || 1;
var edge = p === 0 || p === flat.length - 1 ? 0.5 : 1;
var off = (next() - 0.5) * 2 * reg.jitter * edge;
out.push([flat[p][0] + (-dy / len) * off, flat[p][1] + (dx / len) * off]);
}
return out;
}
// ---- Layout: bake letter x-offsets into the points so every
// path shares ONE flat coordinate space (the global needle can
// then read getPointAtLength coordinates directly). -----------
var characters = Array.from(text);
var letters = [];
var cursor = 0;
for (var ci = 0; ci < characters.length; ci += 1) {
var ch = characters[ci];
var glyph = GLYPHS[ch];
if (!glyph) {
cursor += SPACE_W + GAP;
continue;
}
var strokes = [];
for (var si = 0; si < glyph.length; si += 1) {
var jittered = resampleJitter(glyph[si]);
var shifted = [];
for (var pi = 0; pi < jittered.length; pi += 1) {
shifted.push([jittered[pi][0] + cursor, jittered[pi][1]]);
}
strokes.push({ points: shifted });
}
letters.push({ strokes: strokes });
cursor += GLYPH_W + GAP;
}
var totalWidth = Math.max(GLYPH_W, cursor - GAP);
var PAD = 14;
svg.setAttribute(
"viewBox",
-PAD + " " + -PAD + " " + (totalWidth + 2 * PAD) + " " + (100 + 2 * PAD),
);
// ---- Build DOM + per-stroke dash/hole tables ----------------
function el(name) {
return document.createElementNS(SVG_NS, name);
}
var holeFill = "color-mix(in srgb, var(--fg, #f8fafc) 34%, transparent)";
var totalLength = 0;
for (var li = 0; li < letters.length; li += 1) {
var letter = letters[li];
for (var sj = 0; sj < letter.strokes.length; sj += 1) {
var stroke = letter.strokes[sj];
var d =
"M " +
stroke.points
.map(function (pt) {
return pt[0].toFixed(2) + " " + pt[1].toFixed(2);
})
.join(" L ");
var path = el("path");
path.setAttribute("d", d);
path.setAttribute("fill", "none");
path.setAttribute("stroke", "var(--std-accent)");
path.setAttribute("stroke-width", String(reg.width));
path.setAttribute("stroke-linecap", "round");
svg.appendChild(path);
var L = path.getTotalLength();
stroke.el = path;
stroke.length = L;
totalLength += L;
// Double-dash reveal pattern: alternating dash/gap summing
// EXACTLY to L (ending on a dash element so the appended L
// sits at an odd index and reads as one closing gap).
var pattern = [];
var sum = 0;
while (sum + reg.dash + reg.gap < L) {
pattern.push(reg.dash, reg.gap);
sum += reg.dash + reg.gap;
}
pattern.push(Math.max(0.5, L - sum));
pattern.push(L);
stroke.dasharray = pattern
.map(function (v) {
return v.toFixed(3);
})
.join(" ");
path.setAttribute("stroke-dasharray", stroke.dasharray);
path.setAttribute("stroke-dashoffset", L.toFixed(3));
// Needle holes: one dot at each stitch boundary (dash start
// and dash end), revealed as the front passes.
stroke.holes = [];
var period = reg.dash + reg.gap;
for (var s = 0; s <= L; s += period) {
var boundaries = [s, Math.min(L, s + reg.dash)];
for (var b = 0; b < boundaries.length; b += 1) {
var pt = path.getPointAtLength(boundaries[b]);
var hole = el("circle");
hole.setAttribute("cx", pt.x.toFixed(2));
hole.setAttribute("cy", pt.y.toFixed(2));
hole.setAttribute("r", (reg.width * 0.42).toFixed(2));
hole.setAttribute("fill", holeFill);
hole.setAttribute("opacity", "0");
svg.appendChild(hole);
stroke.holes.push({ el: hole, at: boundaries[b] });
}
}
// End pose for the thread-tail overshoot.
var endPt = path.getPointAtLength(L);
var backPt = path.getPointAtLength(Math.max(0, L - 2));
var tx = endPt.x - backPt.x;
var ty = endPt.y - backPt.y;
var tLen = Math.hypot(tx, ty) || 1;
stroke.end = [endPt.x, endPt.y];
stroke.tangent = [tx / tLen, ty / tLen];
}
}
// Global needle dot + thread tail (letters draw strictly in
// sequence, so one needle serves the whole word).
var tail = el("line");
tail.setAttribute("stroke", "var(--std-accent)");
tail.setAttribute("stroke-width", (reg.width * 0.8).toFixed(2));
tail.setAttribute("stroke-linecap", "round");
tail.setAttribute("opacity", "0");
svg.appendChild(tail);
var needle = el("circle");
needle.setAttribute("r", (reg.width * 1.15).toFixed(2));
needle.setAttribute("fill", "var(--fg, #f8fafc)");
needle.setAttribute("stroke", "color-mix(in srgb, var(--std-accent) 60%, transparent)");
needle.setAttribute("stroke-width", (reg.width * 0.45).toFixed(2));
needle.setAttribute("opacity", "0");
svg.appendChild(needle);
// Envelope: fixed IN/OUT, elastic HOLD, never time-scaled.
var LEAD = 0.15;
var DRAW_BASE = 2.9;
var MARGIN = 0.15;
var PAUSE_BASE = 0.05;
var IN_BASE = LEAD + DRAW_BASE + MARGIN;
var OUT_BASE = exit === "none" ? 0 : 0.45;
var duration = Math.max(0.001, parseFloat(root.dataset.duration || "4"));
var totalBase = Math.max(0.001, IN_BASE + OUT_BASE);
var scale = duration < totalBase ? duration / totalBase : 1;
var lead = LEAD * scale;
var DRAW = DRAW_BASE * scale;
var pause = PAUSE_BASE * scale;
var IN = IN_BASE * scale;
var OUT = OUT_BASE * scale;
var HOLD = Math.max(0, duration - (IN + OUT));
var OUT_START = IN + HOLD;
// Schedule: letters sequential, each letter's window sized by
// its share of the total stitch length; strokes sequential
// within the letter by the same rule.
var pauses = Math.max(0, letters.length - 1) * pause;
var drawable = Math.max(0.05, DRAW - pauses);
var clock = lead;
for (var lj = 0; lj < letters.length; lj += 1) {
var lt = letters[lj];
var letterLen = 0;
for (var sk = 0; sk < lt.strokes.length; sk += 1) {
letterLen += lt.strokes[sk].length;
}
var letterTime = totalLength > 0 ? (drawable * letterLen) / totalLength : 0;
for (var sm = 0; sm < lt.strokes.length; sm += 1) {
var st = lt.strokes[sm];
var strokeTime = letterLen > 0 ? (letterTime * st.length) / letterLen : 0;
st.t0 = clock;
st.t1 = clock + Math.max(0.01, strokeTime);
clock = st.t1;
}
lt.t0 = lt.strokes[0].t0;
lt.t1 = clock;
clock += pause;
}
function clamp01(v) {
return v < 0 ? 0 : v > 1 ? 1 : v;
}
// backOut: overshoots ~10% past 1, then settles to exactly 1.
// The overshoot region drives the thread-tail.
function backOut(u) {
var c1 = 1.70158;
var c3 = c1 + 1;
var x = u - 1;
return 1 + c3 * x * x * x + c1 * x * x;
}
var TAIL_MAX = 16;
// Pure per-update painter (zero per-element tweens): dashoffset
// ATTRIBUTE, hole visibility, and the needle/tail pose are all
// functions of tl.time() alone. Idempotent writes.
function applyTime(timeSeconds) {
var needleOn = false;
var needleX = 0;
var needleY = 0;
var tailFrom = null;
var tailTo = null;
for (var i = 0; i < letters.length; i += 1) {
var letter = letters[i];
for (var j = 0; j < letter.strokes.length; j += 1) {
var stroke = letter.strokes[j];
var span = stroke.t1 - stroke.t0;
var u = clamp01(span > 0 ? (timeSeconds - stroke.t0) / span : 1);
var L = stroke.length;
var visible;
// Round linecaps paint a zero-length-dash dot at the exact
// boundary sitting at the path start when dashoffset = L,
// so undrawn strokes are also opacity-gated.
stroke.el.setAttribute("opacity", u <= 0 ? "0" : "1");
if (u <= 0) {
stroke.el.setAttribute("stroke-dashoffset", L.toFixed(3));
visible = 0;
} else if (u >= 1) {
stroke.el.setAttribute("stroke-dashoffset", "0");
visible = L;
} else {
var p = backOut(u);
var front = clamp01(p) * L;
stroke.el.setAttribute("stroke-dashoffset", (L - front).toFixed(3));
visible = front;
needleOn = true;
if (p <= 1) {
var pt = stroke.el.getPointAtLength(front);
needleX = pt.x;
needleY = pt.y;
} else {
// Thread-tail overshoot: the needle carries the
// thread past the stroke end along its exit tangent,
// then the settle pulls it snug.
var over = Math.min((p - 1) * L, TAIL_MAX);
needleX = stroke.end[0] + stroke.tangent[0] * over;
needleY = stroke.end[1] + stroke.tangent[1] * over;
tailFrom = stroke.end;
tailTo = [needleX, needleY];
}
}
for (var h = 0; h < stroke.holes.length; h += 1) {
stroke.holes[h].el.setAttribute(
"opacity",
stroke.holes[h].at <= visible && u > 0 ? "1" : "0",
);
}
}
}
if (needleOn) {
needle.setAttribute("opacity", "1");
needle.setAttribute("cx", needleX.toFixed(2));
needle.setAttribute("cy", needleY.toFixed(2));
} else {
needle.setAttribute("opacity", "0");
}
if (tailFrom) {
tail.setAttribute("opacity", "0.9");
tail.setAttribute("x1", tailFrom[0].toFixed(2));
tail.setAttribute("y1", tailFrom[1].toFixed(2));
tail.setAttribute("x2", tailTo[0].toFixed(2));
tail.setAttribute("y2", tailTo[1].toFixed(2));
} else {
tail.setAttribute("opacity", "0");
}
}
gsap.set(stage, { opacity: 1, y: "0cqh" });
var tl = gsap.timeline({
paused: true,
onUpdate: function () {
applyTime(tl.time());
},
});
// Anchor tween: an inert plain-object tween spanning [0, D] so
// onUpdate fires for every eventful seek and holds never clamp.
tl.to({ p: 0 }, { p: 1, duration: duration, ease: "none" }, 0);
// HOLD: truly still; repeated repaints write identical values.
// OUT: optional departure; exit none holds until the frame cuts.
if (exit === "up") {
tl.to(stage, { y: "-4cqh", duration: OUT, ease: "power2.in" }, OUT_START);
tl.to(stage, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);
} else if (exit === "fade") {
tl.to(stage, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);
}
tl.seek(0);
applyTime(0);
window.__timelines = window.__timelines || {};
window.__timelines["stitched-text-draw"] = tl;
})();
</script>
</div>
</template>
</body>
</html>
```
</VariablesExplorer>
## Install
<InstallCommand command="npx hyperframes add stitched-text-draw" item="stitched-text-draw" />
That writes one file: `compositions/components/stitched-text-draw.html`.
## Paste it into your composition
Open `compositions/components/stitched-text-draw.html` and copy what is inside into your own composition.
A component has no size or duration of its own. It takes both from the composition
you paste it into.
## Variables
Every one of these has a default, so the piece works untouched. Set the ones you
want to change on the element:
| Variable | Default | Accepts | What it does |
| --- | --- | --- | --- |
| `text` | `STITCH` | string | Uppercased A-Z 0-9 and space, clamped to 12 characters. |
| `stitch` | `fine` | `fine`, `coarse` | Dash/gap scale, thread width, and jitter amplitude. |
| `accent` | `green` | `green`, `blue`, `violet` | Thread color: green rides --brand, blue rides --accent, violet rides --accent-2. |
| `exit` | `none` | `none`, `fade`, `up` | Optional departure. Default none: the stitched word holds until the frame cuts. |
Set them with `data-variable-values` on the element that mounts it. These are the
defaults, so this behaves exactly like the preview above until you change one:
```html wrap
<div
data-composition-id="stitched-text-draw"
data-composition-src="compositions/components/stitched-text-draw.html"
data-variable-values='{"text":"STITCH","stitch":"fine","accent":"green","exit":"none"}'
></div>
```
## Source
<Accordion title={`stitched-text-draw.html`}>
```html
<!doctype html>
<!--
stitched-text-draw: HyperFrames video primitive (type / craft, Wave M
experiment M6)
Text drawn as thread stitches. Letters come from a single-stroke display
alphabet (A-Z 0-9) authored as a compact stroke table of lines and
elliptical arcs per glyph, flattened to polylines at mount, resampled to
stitch-scale steps, and displaced by seeded perpendicular jitter so every
stitch sits at a slightly different angle (hand-sewn wobble). Each stroke
draws thread-first: a needle dot leads the reveal front, needle-hole dots
appear at every stitch boundary behind it, and each letter finishes with
a tiny thread-tail overshoot (the thread sticks out past the stroke end
along its exit tangent, then is pulled snug).
Draw mechanic (gotcha 8, and gotcha "nested SVG mask doesn't repaint
under seek"): the reveal is ATTRIBUTE-driven stroke-dashoffset on the
stitched path itself, using the double-dash trick instead of an SVG mask.
Each path's dasharray is its stitch pattern (dash, gap, dash, ...) built
to sum EXACTLY to the path length L, followed by one closing gap of L
(total 2L). Animating the stroke-dashoffset attribute from L to 0 sweeps
the reveal front from start to end while the visible dashes settle into
their final stitch positions at offset 0. No <mask>, no <clipPath>, no
CSS dashoffset property (Chrome under-invalidates it on reverse seeks);
the painter primes and updates the attribute via setAttribute.
Variables (declared in data-composition-variables below):
- text (string, default "STITCH"): uppercased; A-Z 0-9 and space,
other characters render as spaces; clamped to 12 characters.
- stitch ("fine" | "coarse", default "fine"): dash/gap scale, thread
width, and jitter amplitude.
- accent ("green" | "blue" | "violet", default "green"): thread color;
green rides --brand, blue rides --accent, violet rides --accent-2.
- exit ("none" | "fade" | "up", default "none").
Envelope, fixed IN and OUT with elastic HOLD only (never timeScale):
IN_BASE = 0.15 lead + 2.9 draw + 0.15 margin
HOLD = max(0, D - IN - OUT), truly still
OUT_BASE = 0.45s only when exit != none
If D < IN_BASE + OUT_BASE the whole envelope compresses together.
Letters draw strictly in sequence; each letter's share of the draw
window is proportional to its total stroke length, with a fixed
needle-jump pause between letters.
Determinism and seek-safety: all geometry, jitter (fixed LCG seed
0x57174c3d), stitch patterns, hole positions, and the per-stroke draw
schedule are computed once at mount. One inert anchor tween spans [0, D];
a painter recomputes every stroke's dashoffset, every hole's visibility,
and the needle/tail pose as pure functions of tl.time() on each update
(zero per-element tweens, gotcha 9). Writes are idempotent; eventful
seeks (suppressEvents=false) land identical frames in any order and
either direction.
Mount contract: the runtime clones only this template. #root fills the
host box (no data-width/data-height, container-type: size, cqmin units),
is styled via #root only, and registers one paused timeline under the
LITERAL "stitched-text-draw" key. getTotalLength drives all dash math
(never the pathLength attribute, never non-scaling-stroke on dashed
paths).
-->
<html
lang="en"
data-composition-id="stitched-text-draw"
data-composition-duration="4"
data-composition-variables='[
{ "id": "text", "type": "string", "role": "content", "label": "Text", "description": "Uppercased A-Z 0-9 and space, clamped to 12 characters.", "default": "STITCH" },
{ "id": "stitch", "type": "enum", "role": "style", "label": "Stitch", "description": "Dash/gap scale, thread width, and jitter amplitude.", "default": "fine", "options": [{ "value": "fine", "label": "Fine" }, { "value": "coarse", "label": "Coarse" }] },
{ "id": "accent", "type": "enum", "role": "style", "label": "Accent", "description": "Thread color: green rides --brand, blue rides --accent, violet rides --accent-2.", "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 stitched word 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>Stitched Text Draw</title>
</head>
<body>
<template>
<div id="root" data-composition-id="stitched-text-draw" data-duration="4" data-fps="30">
<style>
*,
*::before,
*::after {
box-sizing: border-box;
}
#root {
position: absolute;
inset: 0;
overflow: hidden;
container-type: size;
isolation: isolate;
color: var(--fg, #f8fafc);
font-family: var(--font-display, system-ui, sans-serif);
pointer-events: none;
}
.std-clip {
position: absolute;
inset: 0;
display: grid;
place-items: center;
overflow: hidden;
background: var(--bg, transparent);
}
.std-stage {
display: grid;
place-items: center;
will-change: transform, opacity;
}
.std-svg {
display: block;
width: 92cqw;
height: 56cqh;
}
</style>
<div
id="stitched-text-draw-clip"
class="std-clip clip"
data-start="0"
data-duration="4"
data-track-index="0"
>
<div class="std-stage" role="img">
<svg
class="std-svg"
xmlns="http://www.w3.org/2000/svg"
preserveAspectRatio="xMidYMid meet"
aria-hidden="true"
></svg>
</div>
</div>
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<script>
(function () {
"use strict";
var SVG_NS = "http://www.w3.org/2000/svg";
var root = document.getElementById("root");
var stage = root.querySelector(".std-stage");
var svg = root.querySelector(".std-svg");
var vars =
window.__hyperframes && window.__hyperframes.getVariables
? window.__hyperframes.getVariables()
: {};
var text = (vars.text == null || vars.text === "" ? "STITCH" : String(vars.text))
.toUpperCase()
.slice(0, 12);
var stitch = vars.stitch === "coarse" ? "coarse" : "fine";
// Each enum choice routes to a DIFFERENT contract token so the
// variable stays meaningful under a theme.
var accentColors = {
green: "var(--brand, #52525b)",
blue: "var(--accent, #52525b)",
violet: "var(--accent-2, #52525b)",
};
var accent = Object.prototype.hasOwnProperty.call(accentColors, vars.accent)
? vars.accent
: "green";
var exit = vars.exit === "fade" || vars.exit === "up" ? vars.exit : "none";
root.style.setProperty("--std-accent", accentColors[accent]);
stage.setAttribute("aria-label", text);
// Stitch registers: dash/gap in glyph units (glyph box 70x100).
var registers = {
fine: { dash: 6.5, gap: 4.5, width: 2.6, jitter: 1.5 },
coarse: { dash: 10, gap: 7, width: 4.2, jitter: 2.3 },
};
var reg = registers[stitch];
// ---- Single-stroke display alphabet -------------------------
// Glyph box: width 70 (space 40), cap height 100, y down.
// Each glyph is an array of strokes; a stroke is an array of
// [x, y] points (lines) built from line points and flattened
// elliptical arcs. Curves only need enough samples to read as
// curved once resampled and jittered.
function arcPts(cx, cy, rx, ry, a0, a1) {
var steps = Math.max(6, Math.ceil(Math.abs(a1 - a0) / 18));
var pts = [];
for (var i = 0; i <= steps; i += 1) {
var a = ((a0 + ((a1 - a0) * i) / steps) * Math.PI) / 180;
pts.push([cx + rx * Math.cos(a), cy + ry * Math.sin(a)]);
}
return pts;
}
function join() {
var out = [];
for (var i = 0; i < arguments.length; i += 1) {
out = out.concat(arguments[i]);
}
return out;
}
var GLYPHS = {
A: [
[
[4, 100],
[35, 2],
[66, 100],
],
[
[15, 64],
[55, 64],
],
],
B: [
[
[6, 2],
[6, 98],
],
join([[6, 2]], arcPts(36, 26, 24, 24, -90, 90), [[6, 50]]),
join([[6, 50]], arcPts(38, 74, 26, 24, -90, 90), [[6, 98]]),
],
C: [arcPts(38, 50, 30, 46, -60, -300)],
D: [
join(
[
[6, 2],
[24, 2],
],
arcPts(24, 50, 40, 48, -90, 90),
[
[24, 98],
[6, 98],
[6, 4],
],
),
],
E: [
[
[60, 2],
[8, 2],
[8, 98],
[60, 98],
],
[
[8, 50],
[48, 50],
],
],
F: [
[
[60, 2],
[8, 2],
[8, 98],
],
[
[8, 50],
[46, 50],
],
],
G: [
join(arcPts(38, 50, 30, 46, -60, -305), [
[56, 62],
[38, 62],
]),
],
H: [
[
[8, 2],
[8, 98],
],
[
[62, 2],
[62, 98],
],
[
[8, 50],
[62, 50],
],
],
I: [
[
[35, 2],
[35, 98],
],
[
[20, 2],
[50, 2],
],
[
[20, 98],
[50, 98],
],
],
J: [
join(
[
[58, 2],
[58, 72],
],
arcPts(33, 72, 25, 26, 0, 180),
),
],
K: [
[
[8, 2],
[8, 98],
],
[
[60, 2],
[8, 56],
],
[
[24, 42],
[62, 98],
],
],
L: [
[
[8, 2],
[8, 98],
[60, 98],
],
],
M: [
[
[6, 98],
[6, 2],
[35, 58],
[64, 2],
[64, 98],
],
],
N: [
[
[8, 98],
[8, 2],
[62, 98],
[62, 2],
],
],
O: [arcPts(35, 50, 30, 47, -90, 270)],
P: [
[
[8, 98],
[8, 2],
],
join(
[
[8, 2],
[36, 2],
],
arcPts(36, 27, 26, 25, -90, 90),
[
[36, 52],
[8, 52],
],
),
],
Q: [
arcPts(35, 50, 30, 47, -90, 270),
[
[46, 70],
[66, 96],
],
],
R: [
[
[8, 98],
[8, 2],
],
join(
[
[8, 2],
[36, 2],
],
arcPts(36, 27, 26, 25, -90, 90),
[
[36, 52],
[8, 52],
],
),
[
[30, 52],
[64, 98],
],
],
S: [
[
[58, 14],
[44, 3],
[24, 3],
[10, 14],
[10, 30],
[24, 42],
[46, 56],
[58, 68],
[58, 86],
[44, 97],
[22, 97],
[8, 86],
],
],
T: [
[
[6, 2],
[64, 2],
],
[
[35, 2],
[35, 98],
],
],
U: [
join(
[
[8, 2],
[8, 68],
],
arcPts(35, 68, 27, 29, 180, 360),
[
[62, 68],
[62, 2],
],
),
],
V: [
[
[6, 2],
[35, 98],
[64, 2],
],
],
W: [
[
[4, 2],
[19, 98],
[35, 34],
[51, 98],
[66, 2],
],
],
X: [
[
[8, 2],
[62, 98],
],
[
[62, 2],
[8, 98],
],
],
Y: [
[
[6, 2],
[35, 50],
],
[
[64, 2],
[35, 50],
[35, 98],
],
],
Z: [
[
[8, 2],
[62, 2],
[8, 98],
[62, 98],
],
],
0: [arcPts(35, 50, 27, 47, -90, 270)],
1: [
[
[20, 20],
[38, 4],
[38, 98],
],
],
2: [
join(arcPts(35, 26, 26, 24, -160, 10), [
[8, 98],
[62, 98],
]),
],
3: [join(arcPts(34, 26, 24, 24, -150, 80), arcPts(36, 73, 26, 25, -100, 150))],
4: [
[
[50, 2],
[6, 66],
[66, 66],
],
[
[50, 44],
[50, 98],
],
],
5: [
[
[58, 3],
[14, 3],
[11, 44],
[34, 38],
[55, 48],
[59, 72],
[46, 94],
[20, 96],
[8, 84],
],
],
6: [
join(
[
[52, 4],
[28, 26],
[13, 56],
],
arcPts(35, 72, 24, 26, -180, 180),
),
],
7: [
[
[8, 3],
[62, 3],
[30, 98],
],
],
8: [join(arcPts(35, 27, 21, 24, 90, 450), arcPts(35, 74, 26, 25, -90, 270))],
9: [
join(arcPts(37, 28, 25, 25, 0, 360), [
[62, 28],
[56, 64],
[34, 98],
]),
],
};
var GLYPH_W = 70;
var SPACE_W = 40;
var GAP = 24;
// Fixed-seed LCG: the only randomness source, consumed in one
// deterministic order during this build phase.
var lcgState = 0x57174c3d;
function next() {
lcgState = (Math.imul(1664525, lcgState) + 1013904223) >>> 0;
return lcgState / 4294967296;
}
// Resample a polyline to even stitch-scale steps, then displace
// each point perpendicular to the local direction: seeded angle
// jitter, so every stitch lands at a slightly different angle.
function resampleJitter(points) {
var STEP = 5;
var flat = [points[0]];
for (var i = 1; i < points.length; i += 1) {
var ax = flat[flat.length - 1][0];
var ay = flat[flat.length - 1][1];
var bx = points[i][0];
var by = points[i][1];
var seg = Math.hypot(bx - ax, by - ay);
var n = Math.max(1, Math.round(seg / STEP));
for (var k = 1; k <= n; k += 1) {
flat.push([ax + ((bx - ax) * k) / n, ay + ((by - ay) * k) / n]);
}
}
var out = [];
for (var p = 0; p < flat.length; p += 1) {
var prev = flat[Math.max(0, p - 1)];
var after = flat[Math.min(flat.length - 1, p + 1)];
var dx = after[0] - prev[0];
var dy = after[1] - prev[1];
var len = Math.hypot(dx, dy) || 1;
var edge = p === 0 || p === flat.length - 1 ? 0.5 : 1;
var off = (next() - 0.5) * 2 * reg.jitter * edge;
out.push([flat[p][0] + (-dy / len) * off, flat[p][1] + (dx / len) * off]);
}
return out;
}
// ---- Layout: bake letter x-offsets into the points so every
// path shares ONE flat coordinate space (the global needle can
// then read getPointAtLength coordinates directly). -----------
var characters = Array.from(text);
var letters = [];
var cursor = 0;
for (var ci = 0; ci < characters.length; ci += 1) {
var ch = characters[ci];
var glyph = GLYPHS[ch];
if (!glyph) {
cursor += SPACE_W + GAP;
continue;
}
var strokes = [];
for (var si = 0; si < glyph.length; si += 1) {
var jittered = resampleJitter(glyph[si]);
var shifted = [];
for (var pi = 0; pi < jittered.length; pi += 1) {
shifted.push([jittered[pi][0] + cursor, jittered[pi][1]]);
}
strokes.push({ points: shifted });
}
letters.push({ strokes: strokes });
cursor += GLYPH_W + GAP;
}
var totalWidth = Math.max(GLYPH_W, cursor - GAP);
var PAD = 14;
svg.setAttribute(
"viewBox",
-PAD + " " + -PAD + " " + (totalWidth + 2 * PAD) + " " + (100 + 2 * PAD),
);
// ---- Build DOM + per-stroke dash/hole tables ----------------
function el(name) {
return document.createElementNS(SVG_NS, name);
}
var holeFill = "color-mix(in srgb, var(--fg, #f8fafc) 34%, transparent)";
var totalLength = 0;
for (var li = 0; li < letters.length; li += 1) {
var letter = letters[li];
for (var sj = 0; sj < letter.strokes.length; sj += 1) {
var stroke = letter.strokes[sj];
var d =
"M " +
stroke.points
.map(function (pt) {
return pt[0].toFixed(2) + " " + pt[1].toFixed(2);
})
.join(" L ");
var path = el("path");
path.setAttribute("d", d);
path.setAttribute("fill", "none");
path.setAttribute("stroke", "var(--std-accent)");
path.setAttribute("stroke-width", String(reg.width));
path.setAttribute("stroke-linecap", "round");
svg.appendChild(path);
var L = path.getTotalLength();
stroke.el = path;
stroke.length = L;
totalLength += L;
// Double-dash reveal pattern: alternating dash/gap summing
// EXACTLY to L (ending on a dash element so the appended L
// sits at an odd index and reads as one closing gap).
var pattern = [];
var sum = 0;
while (sum + reg.dash + reg.gap < L) {
pattern.push(reg.dash, reg.gap);
sum += reg.dash + reg.gap;
}
pattern.push(Math.max(0.5, L - sum));
pattern.push(L);
stroke.dasharray = pattern
.map(function (v) {
return v.toFixed(3);
})
.join(" ");
path.setAttribute("stroke-dasharray", stroke.dasharray);
path.setAttribute("stroke-dashoffset", L.toFixed(3));
// Needle holes: one dot at each stitch boundary (dash start
// and dash end), revealed as the front passes.
stroke.holes = [];
var period = reg.dash + reg.gap;
for (var s = 0; s <= L; s += period) {
var boundaries = [s, Math.min(L, s + reg.dash)];
for (var b = 0; b < boundaries.length; b += 1) {
var pt = path.getPointAtLength(boundaries[b]);
var hole = el("circle");
hole.setAttribute("cx", pt.x.toFixed(2));
hole.setAttribute("cy", pt.y.toFixed(2));
hole.setAttribute("r", (reg.width * 0.42).toFixed(2));
hole.setAttribute("fill", holeFill);
hole.setAttribute("opacity", "0");
svg.appendChild(hole);
stroke.holes.push({ el: hole, at: boundaries[b] });
}
}
// End pose for the thread-tail overshoot.
var endPt = path.getPointAtLength(L);
var backPt = path.getPointAtLength(Math.max(0, L - 2));
var tx = endPt.x - backPt.x;
var ty = endPt.y - backPt.y;
var tLen = Math.hypot(tx, ty) || 1;
stroke.end = [endPt.x, endPt.y];
stroke.tangent = [tx / tLen, ty / tLen];
}
}
// Global needle dot + thread tail (letters draw strictly in
// sequence, so one needle serves the whole word).
var tail = el("line");
tail.setAttribute("stroke", "var(--std-accent)");
tail.setAttribute("stroke-width", (reg.width * 0.8).toFixed(2));
tail.setAttribute("stroke-linecap", "round");
tail.setAttribute("opacity", "0");
svg.appendChild(tail);
var needle = el("circle");
needle.setAttribute("r", (reg.width * 1.15).toFixed(2));
needle.setAttribute("fill", "var(--fg, #f8fafc)");
needle.setAttribute("stroke", "color-mix(in srgb, var(--std-accent) 60%, transparent)");
needle.setAttribute("stroke-width", (reg.width * 0.45).toFixed(2));
needle.setAttribute("opacity", "0");
svg.appendChild(needle);
// Envelope: fixed IN/OUT, elastic HOLD, never time-scaled.
var LEAD = 0.15;
var DRAW_BASE = 2.9;
var MARGIN = 0.15;
var PAUSE_BASE = 0.05;
var IN_BASE = LEAD + DRAW_BASE + MARGIN;
var OUT_BASE = exit === "none" ? 0 : 0.45;
var duration = Math.max(0.001, parseFloat(root.dataset.duration || "4"));
var totalBase = Math.max(0.001, IN_BASE + OUT_BASE);
var scale = duration < totalBase ? duration / totalBase : 1;
var lead = LEAD * scale;
var DRAW = DRAW_BASE * scale;
var pause = PAUSE_BASE * scale;
var IN = IN_BASE * scale;
var OUT = OUT_BASE * scale;
var HOLD = Math.max(0, duration - (IN + OUT));
var OUT_START = IN + HOLD;
// Schedule: letters sequential, each letter's window sized by
// its share of the total stitch length; strokes sequential
// within the letter by the same rule.
var pauses = Math.max(0, letters.length - 1) * pause;
var drawable = Math.max(0.05, DRAW - pauses);
var clock = lead;
for (var lj = 0; lj < letters.length; lj += 1) {
var lt = letters[lj];
var letterLen = 0;
for (var sk = 0; sk < lt.strokes.length; sk += 1) {
letterLen += lt.strokes[sk].length;
}
var letterTime = totalLength > 0 ? (drawable * letterLen) / totalLength : 0;
for (var sm = 0; sm < lt.strokes.length; sm += 1) {
var st = lt.strokes[sm];
var strokeTime = letterLen > 0 ? (letterTime * st.length) / letterLen : 0;
st.t0 = clock;
st.t1 = clock + Math.max(0.01, strokeTime);
clock = st.t1;
}
lt.t0 = lt.strokes[0].t0;
lt.t1 = clock;
clock += pause;
}
function clamp01(v) {
return v < 0 ? 0 : v > 1 ? 1 : v;
}
// backOut: overshoots ~10% past 1, then settles to exactly 1.
// The overshoot region drives the thread-tail.
function backOut(u) {
var c1 = 1.70158;
var c3 = c1 + 1;
var x = u - 1;
return 1 + c3 * x * x * x + c1 * x * x;
}
var TAIL_MAX = 16;
// Pure per-update painter (zero per-element tweens): dashoffset
// ATTRIBUTE, hole visibility, and the needle/tail pose are all
// functions of tl.time() alone. Idempotent writes.
function applyTime(timeSeconds) {
var needleOn = false;
var needleX = 0;
var needleY = 0;
var tailFrom = null;
var tailTo = null;
for (var i = 0; i < letters.length; i += 1) {
var letter = letters[i];
for (var j = 0; j < letter.strokes.length; j += 1) {
var stroke = letter.strokes[j];
var span = stroke.t1 - stroke.t0;
var u = clamp01(span > 0 ? (timeSeconds - stroke.t0) / span : 1);
var L = stroke.length;
var visible;
// Round linecaps paint a zero-length-dash dot at the exact
// boundary sitting at the path start when dashoffset = L,
// so undrawn strokes are also opacity-gated.
stroke.el.setAttribute("opacity", u <= 0 ? "0" : "1");
if (u <= 0) {
stroke.el.setAttribute("stroke-dashoffset", L.toFixed(3));
visible = 0;
} else if (u >= 1) {
stroke.el.setAttribute("stroke-dashoffset", "0");
visible = L;
} else {
var p = backOut(u);
var front = clamp01(p) * L;
stroke.el.setAttribute("stroke-dashoffset", (L - front).toFixed(3));
visible = front;
needleOn = true;
if (p <= 1) {
var pt = stroke.el.getPointAtLength(front);
needleX = pt.x;
needleY = pt.y;
} else {
// Thread-tail overshoot: the needle carries the
// thread past the stroke end along its exit tangent,
// then the settle pulls it snug.
var over = Math.min((p - 1) * L, TAIL_MAX);
needleX = stroke.end[0] + stroke.tangent[0] * over;
needleY = stroke.end[1] + stroke.tangent[1] * over;
tailFrom = stroke.end;
tailTo = [needleX, needleY];
}
}
for (var h = 0; h < stroke.holes.length; h += 1) {
stroke.holes[h].el.setAttribute(
"opacity",
stroke.holes[h].at <= visible && u > 0 ? "1" : "0",
);
}
}
}
if (needleOn) {
needle.setAttribute("opacity", "1");
needle.setAttribute("cx", needleX.toFixed(2));
needle.setAttribute("cy", needleY.toFixed(2));
} else {
needle.setAttribute("opacity", "0");
}
if (tailFrom) {
tail.setAttribute("opacity", "0.9");
tail.setAttribute("x1", tailFrom[0].toFixed(2));
tail.setAttribute("y1", tailFrom[1].toFixed(2));
tail.setAttribute("x2", tailTo[0].toFixed(2));
tail.setAttribute("y2", tailTo[1].toFixed(2));
} else {
tail.setAttribute("opacity", "0");
}
}
gsap.set(stage, { opacity: 1, y: "0cqh" });
var tl = gsap.timeline({
paused: true,
onUpdate: function () {
applyTime(tl.time());
},
});
// Anchor tween: an inert plain-object tween spanning [0, D] so
// onUpdate fires for every eventful seek and holds never clamp.
tl.to({ p: 0 }, { p: 1, duration: duration, ease: "none" }, 0);
// HOLD: truly still; repeated repaints write identical values.
// OUT: optional departure; exit none holds until the frame cuts.
if (exit === "up") {
tl.to(stage, { y: "-4cqh", duration: OUT, ease: "power2.in" }, OUT_START);
tl.to(stage, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);
} else if (exit === "fade") {
tl.to(stage, { opacity: 0, duration: OUT, ease: "power2.in" }, OUT_START);
}
tl.seek(0);
applyTime(0);
window.__timelines = window.__timelines || {};
window.__timelines["stitched-text-draw"] = tl;
})();
</script>
</div>
</template>
</body>
</html>
```
</Accordion>
{/* hf:generated-footer */}
Tagged `motion-primitive` `experiment` `type` `craft` `stitch` `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)
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