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Vance IngallsandClaude Opus 4.8
619a603eab
Animating layout properties (left/right/top/bottom/margin*) or using
roundProps snaps motion to integer device pixels. Under the seek-by-frame
capture engine this is invisible at high per-frame deltas (fast tweens) but
visibly stutters at low deltas (slow tweens / ease-out tails): sub-pixel
movement rounds to the same pixel for several frames, then jumps a whole
pixel. Transforms (x/y/scale) interpolate sub-pixel and stay smooth.
New rule gsap_non_transform_motion (error):
- Sources timeline tweens from the acorn parser's full animation list, so
label- and relative-positioned tweens (tl.to(..., "label") / "+=1") are
covered and real AST keys avoid phantom-prop / nested-brace misreads.
- Exempts html-in-canvas elements (a <canvas layoutsubtree> ancestor): they
are rasterized from sub-pixel getComputedStyle and do not integer-snap.
Per-element resolution, so a grouped glass+text tween still flags the
plain-DOM half. roundProps is never exempt (it rounds before the style).
- Uses Object.hasOwn for the layout-prop lookup, skips set(), and merges
standalone gsap.* calls.
Migrated 9 registry compositions off layout-prop animation onto transforms,
each render-verified visually identical:
- liquid-glass-{notification,widgets,media-controls,context-menu}: plain-DOM
text overlays -> transforms; glass panels stay on left/top (canvas-exempt).
- vignelli: curtain wipes left:% -> xPercent.
- lt-mask-reveal: sweep left:% -> x px.
- flowchart, flowchart-vertical, decision-tree: cursor paths left/top -> x/y.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
120 lines
3.8 KiB
HTML
Vendored
120 lines
3.8 KiB
HTML
Vendored
<!doctype html>
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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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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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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background: transparent;
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overflow: hidden;
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}
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body {
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width: 1920px;
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height: 1080px;
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font-family: "Montserrat", sans-serif;
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}
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#root .lt {
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position: absolute;
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left: 130px;
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bottom: 122px;
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display: flex;
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flex-direction: column;
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align-items: flex-start;
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gap: 14px;
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}
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#root .lt-namewrap {
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position: relative;
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overflow: hidden;
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padding: 2px 0;
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}
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#root .lt-name {
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font-size: 72px;
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font-weight: 900;
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color: #ffffff;
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line-height: 0.98;
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letter-spacing: -0.02em;
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white-space: nowrap;
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text-shadow: 0 2px 22px rgba(0, 0, 0, 0.45);
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will-change: clip-path;
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}
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#root .lt-sweep {
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position: absolute;
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top: 0;
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bottom: 0;
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left: 0;
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width: 8px;
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background: #ffd23f;
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}
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#root .lt-role {
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font-size: 28px;
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font-weight: 500;
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color: #e7eaf0;
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line-height: 1.2;
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letter-spacing: 0.02em;
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white-space: nowrap;
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text-shadow: 0 2px 16px rgba(0, 0, 0, 0.45);
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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="root"
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data-composition-id="lt-mask-reveal"
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data-width="1920"
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data-height="1080"
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data-start="0"
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data-duration="4.8"
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>
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<div id="lt-clip" class="clip" data-start="0" data-duration="4.8" data-track-index="0">
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<div id="lt" class="lt">
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<div class="lt-namewrap">
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<div id="lt-name" class="lt-name">Dr. Maya Chen</div>
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<div id="lt-sweep" class="lt-sweep"></div>
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</div>
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<div id="lt-role" class="lt-role">Host · Neuroscientist</div>
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</div>
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</div>
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</div>
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<script>
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window.__timelines = window.__timelines || {};
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var tl = gsap.timeline({ paused: true });
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var wrap = document.getElementById("lt");
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var nameEl = document.getElementById("lt-name");
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var sweep = document.getElementById("lt-sweep");
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var role = document.getElementById("lt-role");
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// An accent sweep crosses left→right; the name is revealed by a clip-path wipe behind it; role fades up.
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// Sweep travel: left:"100%" was parent-relative (offsetParent = .lt-namewrap). Since the sweep is
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// only 8px wide, xPercent would travel just 8px, so translate by the container width in pixels instead.
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// The .lt-namewrap shrink-wraps the name "Dr. Maya Chen" to 536px (no horizontal padding/border, so
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// clientWidth == content width), which is exactly what left:"100%" resolved to.
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var SWEEP_TRAVEL = 536;
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gsap.set(nameEl, { clipPath: "inset(0 100% 0 0)" });
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gsap.set(sweep, { x: 0, opacity: 0 });
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gsap.set(role, { y: 14, opacity: 0 });
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tl.to(sweep, { opacity: 1, duration: 0.12, ease: "none" }, 0.1);
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tl.to(sweep, { x: SWEEP_TRAVEL, duration: 0.55, ease: "power2.inOut" }, 0.12);
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tl.to(nameEl, { clipPath: "inset(0 0% 0 0)", duration: 0.5, ease: "power2.inOut" }, 0.16);
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tl.to(sweep, { opacity: 0, duration: 0.15, ease: "none" }, 0.6);
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tl.to(role, { y: 0, opacity: 1, duration: 0.5, ease: "power3.out" }, 0.55);
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// Exit: name un-wipes, role fades, hard kill.
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tl.to(role, { opacity: 0, duration: 0.3, ease: "power2.in" }, 4.25);
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tl.to(nameEl, { clipPath: "inset(0 0 0 100%)", duration: 0.4, ease: "power2.in" }, 4.3);
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tl.set(wrap, { visibility: "hidden" }, 4.75);
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window.__timelines["lt-mask-reveal"] = tl;
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</script>
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</body>
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</html>
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