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vendor/OpenMontage/.agents/skills/hyperframes-animation/examples/concept-demo-decode-pan.html
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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=1920, height=1080" />
<title>Scene 7 — HyperFrames Decrypt Pan Track</title>
<!--
HyperFrames composition.tsx.
Choreography (4 phases, 7 seconds total):
0.0 – 0.7s Shot 1 static text fades in + rises ("HyperFrames renders")
0.7 – 1.6s Hacker-flip decodes the accent word ("video")
2.8 – 3.5s Horizontal pan to Shot 2 with parallax exit + scale-in
3.7 – 6.1s Cursor-tracked typing: "HTML, CSS and JS become MP4"
(NOT @the source/layout-utils, NOT a charWidthRatio constant)
- Bar width pre-allocated from the full text — never tweened
- Camera follows cursor by tweening the strip's `x`, with a piecewise
Math.min(initialOffset, trackingOffset) for the two-phase camera
- Hacker-flip glyph flicker via deterministic int hash, not Math.random
-->
<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/gsap.min.js"></script>
<style>
:root {
--bg: linear-gradient(
135deg,
#3a3a3a 0%,
#17211f 30%,
#0b2328 48%,
#1f3518 70%,
#343434 100%
);
--text-dark: #f8fafc;
--text-highlight: #18d9e8;
--text-highlight-2: #7bea5a;
--search-bg: rgba(14, 24, 23, 0.82);
--cursor: #7bea5a;
}
* {
margin: 0;
padding: 0;
box-sizing: border-box;
}
html,
body {
margin: 0;
width: 1920px;
height: 1080px;
overflow: hidden;
background: var(--bg);
font-family:
"Inter",
system-ui,
-apple-system,
sans-serif;
color: var(--text-dark);
}
.viewport {
position: absolute;
inset: 0;
overflow: hidden;
}
.strip {
display: flex;
height: 100%;
will-change: transform;
}
.shot {
width: 1920px;
height: 100%;
position: relative;
flex-shrink: 0;
}
/* ============================================================
SHOT 1 — "HyperFrames renders video"
============================================================ */
.shot1-content {
position: absolute;
inset: 0;
display: flex;
align-items: center;
justify-content: center;
opacity: 0; /* GSAP fromTo fades in */
}
.shot1-row {
display: flex;
align-items: baseline;
gap: 0.4em;
font-size: 130px;
}
.shot1-static {
font-weight: 500;
color: var(--text-dark);
text-shadow: 0 0 36px rgba(24, 217, 232, 0.18);
}
.shot1-accent {
font-weight: 700;
display: flex;
perspective: 800px; /* required for the per-glyph rotateX */
}
.flip-glyph {
position: relative;
display: inline-block;
min-width: 0;
}
.flip-glyph.space {
min-width: 0.4em;
}
.flip-glyph .ghost {
opacity: 0;
}
.flip-glyph .anim {
position: absolute;
left: 0;
top: 0;
width: 100%;
color: var(--text-highlight);
background: linear-gradient(135deg, var(--text-highlight) 0%, var(--text-highlight-2) 100%);
-webkit-background-clip: text;
background-clip: text;
-webkit-text-fill-color: transparent;
filter: drop-shadow(0 0 24px rgba(24, 217, 232, 0.32))
drop-shadow(0 0 36px rgba(123, 234, 90, 0.22));
opacity: 0;
transform: perspective(600px) rotateX(90deg);
transform-origin: bottom;
backface-visibility: hidden;
}
/* ============================================================
SHOT 2 — Search bar with cursor-tracked typing
============================================================ */
.shot2-bar {
position: absolute;
top: 50%;
/* left set by JS once we know the bar's world coordinate */
height: 240px;
background: var(--search-bg);
border: 1px solid rgba(123, 234, 90, 0.22);
box-shadow:
0 0 60px rgba(24, 217, 232, 0.2),
0 0 96px rgba(123, 234, 90, 0.14),
inset 0 0 32px rgba(24, 217, 232, 0.08);
border-radius: 999px;
display: flex;
align-items: center;
padding-left: 120px;
padding-right: 180px;
opacity: 0; /* GSAP fromTo fades in */
transform-origin: left center;
}
.search-text {
font-size: 120px;
font-weight: 400;
color: var(--text-dark);
text-shadow: 0 0 24px rgba(248, 250, 252, 0.16);
white-space: pre;
line-height: 1;
}
.search-cursor {
font-size: 120px;
color: var(--cursor);
text-shadow: 0 0 26px rgba(123, 234, 90, 0.42);
margin-left: 4px;
font-weight: 300;
line-height: 1;
}
/* Hidden probe used by measureNodeWidth */
.measure-probe {
position: absolute;
left: -99999px;
top: -99999px;
visibility: hidden;
white-space: pre;
}
</style>
</head>
<body>
<div
id="root"
data-composition-id="main"
data-start="0"
data-duration="7"
data-width="1920"
data-height="1080"
>
<div class="viewport" data-layout-allow-overflow>
<div class="strip" data-layout-allow-overflow>
<!-- =====================================================
SHOT 1 — "HyperFrames renders video"
===================================================== -->
<div
id="shot-decode"
class="shot shot1 clip"
data-start="0"
data-duration="3.5"
data-track-index="1"
>
<div class="shot1-content">
<div class="shot1-row">
<span class="shot1-static">HyperFrames renders</span>
<span class="shot1-accent" aria-label="video">
<!-- .flip-glyph spans generated by JS -->
</span>
</div>
</div>
</div>
<!-- =====================================================
SHOT 2 — Search bar typing
===================================================== -->
<div
id="shot-typing"
class="shot shot2 clip"
data-start="2.5"
data-duration="4.5"
data-track-index="2"
>
<div class="shot2-bar">
<span class="search-text"></span><span class="search-cursor">_</span>
</div>
</div>
</div>
</div>
</div>
<script>
/* ================================================================
CONSTANTS — all baked at setup time.
================================================================ */
const W = 1920,
H = 1080;
const COMPOSITION_DURATION = 7;
const FPS_HASH = 60; // synthetic clock for the flicker hash
const TIMING = {
// Phase 1: shot1 text fades in + rises
shot1EntryStart: 0.0,
shot1EntryDur: 0.67,
// Phase 2: hacker-flip "video"
flipStart: 0.7,
flipStagger: 0.066, // ~2 frames at 30fps per glyph
flipDuration: 0.55,
// Phase 3: horizontal pan
panStart: 2.83,
panDuration: 0.67,
// Phase 4: cursor-tracked typing
typingStart: 3.67, // panStart + panDuration + 0.17 buffer
charRate: 0.083, // seconds per character (~2.5 frames at 30fps)
};
const FULL_TEXT = "HTML, CSS and JS become MP4";
const FONT_SIZE = 120;
const PADDING_LEFT = 120;
const PADDING_RIGHT = 180;
const CURSOR_VIS_W = FONT_SIZE * 0.6; // visual cursor width approximation
const CURSOR_TARGET = W * 0.7; // screen X where cursor locks
const BAR_LEFT_MARGIN = 80; // initial left margin in Phase 4
const PARALLAX_DIST = 400; // px Shot 1 moves extra during pan
/* ================================================================
BUILD DOM — flip glyphs (Shot 1) generated synchronously.
The accent text is "video" → 5 glyphs.
================================================================ */
const accentEl = document.querySelector(".shot1-accent");
const ACCENT_WORD = "video";
ACCENT_WORD.split("").forEach((char, index) => {
const span = document.createElement("span");
span.className = "flip-glyph" + (char === " " ? " space" : "");
span.dataset.char = char;
span.dataset.index = String(index);
// Each glyph needs its own font-size to match the surrounding row.
span.style.fontSize = "130px";
const ghost = document.createElement("span");
ghost.className = "ghost";
ghost.textContent = char === " " ? " " : char;
const anim = document.createElement("span");
anim.className = "anim";
anim.textContent = char === " " ? " " : char;
span.append(ghost, anim);
accentEl.appendChild(span);
});
/* ================================================================
TEXT MEASUREMENT — uses a hidden DOM probe so we capture
real letter-spacing, kerning, and font-feature widths.
Must run AFTER document.fonts.ready.
================================================================ */
function measureNodeWidth(text, font) {
const probe = document.createElement("span");
probe.className = "measure-probe";
probe.style.font = font;
probe.style.whiteSpace = "pre";
probe.textContent = text;
document.body.appendChild(probe);
const width = probe.getBoundingClientRect().width;
probe.remove();
return width;
}
/* ================================================================
TIMELINE BUILD — fires after fonts are ready so measurements
use the real rendered metrics, not fallback fonts.
================================================================ */
window.__timelines = window.__timelines || {};
const tl = gsap.timeline({ paused: true });
// Register early so HF can find it; tweens are added below.
window.__timelines["main"] = tl;
document.fonts.ready.then(() => {
const searchFont = `400 ${FONT_SIZE}px Inter, system-ui, sans-serif`;
const fullTextWidth = measureNodeWidth(FULL_TEXT, searchFont);
const barWidth = PADDING_LEFT + fullTextWidth + CURSOR_VIS_W + PADDING_RIGHT;
// Pre-allocate the bar's final width — no width tweens ever.
const barEl = document.querySelector(".shot2-bar");
barEl.style.width = barWidth + "px";
// Initial bar position in Shot 2's local space.
// We position it at LEFT_MARGIN from the shot's left edge.
barEl.style.left = BAR_LEFT_MARGIN + "px";
barEl.style.transform = "translateY(-50%)"; // vertical center
// ============================================================
// PHASE 1: Shot 1 text fade in + rise
// ============================================================
tl.fromTo(
".shot1-content",
{ opacity: 0, y: 30 },
{
opacity: 1,
y: 0,
duration: TIMING.shot1EntryDur,
ease: "power2.out",
},
TIMING.shot1EntryStart,
);
// ============================================================
// PHASE 2: Hacker-flip "video"
// ============================================================
const CHAR_POOL = "abcdefghijklmnopqrstuvwxyz";
const FLICKER = 3;
const REVEAL_AT = 0.6;
// Deterministic 32-bit mix — replaces Math.random / seeded RNG.
function pseudoHash(i, t) {
return ((i * 374761393 + t * 668265263) >>> 0) % CHAR_POOL.length;
}
document.querySelectorAll(".flip-glyph").forEach((glyph) => {
const index = Number(glyph.dataset.index);
const real = glyph.dataset.char === " " ? " " : glyph.dataset.char;
const anim = glyph.querySelector(".anim");
const start = TIMING.flipStart + index * TIMING.flipStagger;
tl.fromTo(
anim,
{ rotationX: 90, opacity: 0, "--p": 0 },
{
rotationX: 0,
opacity: 1,
"--p": 1,
duration: TIMING.flipDuration,
ease: "back.out(1.6)", // spring(stiffness:150, damping:14)
onUpdate: function () {
const p = Number(gsap.getProperty(anim, "--p"));
if (p >= REVEAL_AT) {
if (anim.textContent !== real) anim.textContent = real;
} else {
const localFrame = Math.floor((tl.time() - start) * FPS_HASH);
const bucket = Math.max(0, Math.floor(localFrame / FLICKER));
anim.textContent = CHAR_POOL[pseudoHash(index, bucket)];
}
},
},
start,
);
});
// ============================================================
// PHASE 3: Horizontal pan + parallax exit + Shot 2 entry
// All three tweens at the same timeline position run in parallel.
// ============================================================
// (a) Camera pan — strip slides one full viewport left.
tl.to(
".strip",
{
x: -W,
duration: TIMING.panDuration,
ease: "power3.inOut", // cinematic slow-in-slow-out
},
TIMING.panStart,
);
// (b) Shot 1 parallax exit — content moves EXTRA -PARALLAX_DIST.
tl.to(
".shot1-content",
{
x: -PARALLAX_DIST,
duration: TIMING.panDuration,
ease: "power3.inOut",
},
TIMING.panStart,
);
// Shot 1 fades out partway through the pan so the eye lands on Shot 2.
tl.to(
".shot1-content",
{
opacity: 0,
duration: TIMING.panDuration * 0.4,
ease: "power2.out",
},
TIMING.panStart,
);
// (c) Shot 2 bar entry — fade + scale with mild overshoot ("landing").
tl.fromTo(
".shot2-bar",
{ opacity: 0, scale: 0.8 },
{
opacity: 1,
scale: 1,
duration: TIMING.panDuration,
ease: "back.out(1.2)",
},
TIMING.panStart,
);
// ============================================================
// PHASE 4: Cursor-tracked typing.
//
// The strip is now at x = -W (Shot 2 fully on screen). For the
// cursor-track effect we'll *further* shift the strip by a piecewise
// amount: hold initial offset while the empty bar's cursor is left
// of CURSOR_TARGET, then follow once typing pushes it past.
// ============================================================
const searchTextEl = document.querySelector(".search-text");
const stripEl = document.querySelector(".strip");
const CURSOR_WIDTH_HALF = CURSOR_VIS_W / 2;
const STRIP_BASE_X = -W; // strip's x at the end of Phase 3
// Initial Phase-4 offset = 0 (no additional shift on top of -W).
// i.e. bar already sits at BAR_LEFT_MARGIN inside Shot 2.
const INITIAL_OFFSET = 0;
// Typing driver — a clock that runs from 0 to FULL_TEXT.length.
const typingProxy = { progress: 0 };
const typingDur = FULL_TEXT.length * TIMING.charRate;
const typingEnd = TIMING.typingStart + typingDur;
const postTypingHold = Math.max(0, COMPOSITION_DURATION - typingEnd);
tl.to(
typingProxy,
{
progress: FULL_TEXT.length,
duration: typingDur,
ease: "none",
onUpdate: function () {
const charsTyped = Math.min(FULL_TEXT.length, Math.floor(typingProxy.progress));
const visibleText = FULL_TEXT.slice(0, charsTyped);
if (searchTextEl.textContent !== visibleText) {
searchTextEl.textContent = visibleText;
}
// Measure current visible width to compute cursor screen position.
// Cheap because Inter's metrics are cached after the first call.
const visibleW =
visibleText.length === 0 ? 0 : measureNodeWidth(visibleText, searchFont);
// Cursor X in *Shot 2's* coordinate system:
// shot left edge → bar left edge (BAR_LEFT_MARGIN)
// → cursor within bar (PADDING_LEFT + visibleW + CURSOR_WIDTH_HALF)
const cursorXInShot2 = BAR_LEFT_MARGIN + PADDING_LEFT + visibleW + CURSOR_WIDTH_HALF;
// For the cursor to land at CURSOR_TARGET on the *screen*, the
// strip must be shifted by:
// stripX = CURSOR_TARGET - cursorXInShot2 - W (the -W accounts
// for Shot 2 being the SECOND shot in the strip)
const trackingStripX = CURSOR_TARGET - cursorXInShot2 - W;
// Piecewise: hold STRIP_BASE_X + INITIAL_OFFSET until tracking
// would pan FURTHER LEFT than the base, then follow.
const finalStripX = Math.min(STRIP_BASE_X + INITIAL_OFFSET, trackingStripX);
gsap.set(stripEl, { x: finalStripX });
},
},
TIMING.typingStart,
);
if (postTypingHold > 0) {
tl.to(
".search-cursor",
{
opacity: 0.22,
duration: postTypingHold / 2,
repeat: 1,
yoyo: true,
ease: "none",
},
typingEnd,
);
}
});
</script>
</body>
</html>