[teamai] Push 87 resource(s) from XingfenD
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# GSAP Effects for HyperFrames
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Drop-in animation patterns. Snippets show mechanism only, inside a standard scene clip (hyperframes-core); assume `tl` exists.
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- [Typewriter](#typewriter) — character-by-character reveal with optional cursor / backspace / word rotation
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- [Audio Visualizer](#audio-visualizer) — pre-extract audio data, drive Canvas/DOM rendering from the timeline
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## Typewriter
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Requires GSAP's TextPlugin alongside the core script:
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```html
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<script src="https://cdn.jsdelivr.net/npm/gsap@3.14.2/dist/TextPlugin.min.js"></script>
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<script>
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gsap.registerPlugin(TextPlugin);
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</script>
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```
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### Basic
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```js
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const text = "Hello, world!";
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const cps = 10; // chars per second — see timing table
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tl.to(
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"#typed-text",
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{ text: { value: text }, duration: text.length / cps, ease: "none" },
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startTime,
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);
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```
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### Blinking Cursor
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Three rules: **one cursor visible at a time** (hide previous before showing next); **cursor must blink when idle** (after typing, during holds); **no gap between text and cursor** (elements flush in HTML).
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```html
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<span id="typed-text"></span><span id="cursor" class="cursor-blink">|</span>
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```
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```css
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@keyframes blink {
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0%,
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100% {
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opacity: 1;
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}
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50% {
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opacity: 0;
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}
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}
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.cursor-blink {
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animation: blink 0.8s step-end infinite;
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}
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.cursor-solid {
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animation: none;
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opacity: 1;
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}
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.cursor-hide {
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animation: none;
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opacity: 0;
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}
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```
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Pattern: blink → solid (typing starts) → type → blink (typing done):
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```js
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tl.call(() => cursor.classList.replace("cursor-blink", "cursor-solid"), [], startTime);
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tl.to("#typed-text", { text: { value: text }, duration: dur, ease: "none" }, startTime);
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tl.call(() => cursor.classList.replace("cursor-solid", "cursor-blink"), [], startTime + dur);
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```
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Multi-line handoff: hide previous cursor → blink new → brief pause (~0.5s) → solid when typing. Never go `hidden → solid` (skips the idle blink).
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### Backspacing
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TextPlugin removes from the front — wrong for backspace. Use manual substring removal:
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```js
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function backspace(tl, selector, word, startTime, cps) {
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const el = document.querySelector(selector);
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const interval = 1 / cps;
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for (let i = word.length - 1; i >= 0; i--) {
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tl.call(
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() => (el.textContent = word.slice(0, i)),
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[],
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startTime + (word.length - i) * interval,
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);
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}
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return word.length * interval;
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}
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```
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### Spacing With Static Text
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A typewriter word next to static text (`<span>Ship something</span><span style="margin-left:14px"><span id="word"></span><span id="cursor">|</span></span>` in a baseline-aligned flex row): use `margin-left` on the wrapper span. Don't use flex `gap` (it spaces the cursor from the text) and don't put a trailing space in the static text (it collapses when the dynamic span is empty).
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### Word Rotation
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Type → hold → backspace → next word; cursor blinks during every idle moment:
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```js
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let offset = 0;
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words.forEach((word, i) => {
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const typeDur = word.length / 10;
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// cursor: solid while typing, blink during holds (same call pattern as above)
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tl.to("#typed-text", { text: { value: word }, duration: typeDur, ease: "none" }, offset);
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offset += typeDur + 1.5; // hold
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if (i < words.length - 1) offset += backspace(tl, "#typed-text", word, offset, 20) + 0.3;
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});
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```
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### Appending Words
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Build a sentence word-by-word into the same element: keep an `accumulated` string, each step tweens `text: { value: accumulated + " " + word }` with `duration: newChars / cps`, then advances the offset.
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### Timing Guide
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| CPS | Feel | Good for |
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| ----- | ---------------- | -------------------------- |
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| 3-5 | Slow, deliberate | Dramatic reveals, suspense |
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| 8-12 | Natural typing | Dialogue, narration |
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| 15-20 | Fast, energetic | Tech demos, code |
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| 30+ | Near-instant | Filling long blocks |
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## Audio Visualizer
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Pre-extract audio data, drive Canvas / DOM rendering from the timeline. **Do not use the Web Audio API at render time** — there's no playback during seek.
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### Extract Audio Data
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Bundled extractor (requires `ffmpeg` + Python `numpy`):
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```bash
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python skills/hyperframes-creative/scripts/extract-audio-data.py audio.mp3 -o audio-data.json
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python skills/hyperframes-creative/scripts/extract-audio-data.py video.mp4 --fps 30 --bands 16 -o audio-data.json
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```
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Output: `{ "fps": 30, "totalFrames": 5415, "frames": [{ "time": 0.0, "rms": 0.42, "bands": [0.8, 0.6, 0.3] }] }` — `rms` (0-1) is overall loudness; `bands[]` (0-1) are frequency magnitudes, index 0 = bass, each band normalized independently.
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### Loading (Synchronously)
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Inline the JSON for small files (< ~500 KB), or sync XHR for large ones:
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```js
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const xhr = new XMLHttpRequest();
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xhr.open("GET", "audio-data.json", false); // synchronous — deliberate
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xhr.send();
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const AUDIO_DATA = JSON.parse(xhr.responseText);
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```
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**Do NOT use async `fetch()`** — HyperFrames reads `window.__timelines` synchronously after page load; building the timeline inside `.then()` means it isn't ready when capture starts.
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### Driving the Timeline
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Canvas 2D is the workhorse (bars, waveforms, circles, gradients) — one `tl.call` per frame:
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```js
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const ctx = document.getElementById("viz").getContext("2d");
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for (let f = 0; f < AUDIO_DATA.totalFrames; f++) {
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tl.call(
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() => {
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const frame = AUDIO_DATA.frames[f];
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ctx.clearRect(0, 0, canvas.width, canvas.height);
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// draw using frame.rms and frame.bands
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},
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[],
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f / AUDIO_DATA.fps,
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);
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}
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```
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WebGL / Three.js: HyperFrames patches `THREE.Clock` for deterministic time — update uniforms from audio data each frame. DOM elements: fine under ~20 elements, slower than Canvas beyond that.
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### Smoothing
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```js
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let prev = null;
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const smoothing = 0.25; // 0.1-0.2 snappy, 0.3-0.5 flowing
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function smooth(f) {
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const raw = AUDIO_DATA.frames[f];
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if (!prev) prev = { rms: raw.rms, bands: [...raw.bands] };
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else {
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prev = {
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rms: prev.rms * smoothing + raw.rms * (1 - smoothing),
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bands: raw.bands.map((b, i) => prev.bands[i] * smoothing + b * (1 - smoothing)),
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};
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}
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return prev;
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}
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```
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### Design Guide
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- **Spatial mapping** — horizontal: bass left, treble right; vertical: bass bottom; circular: bass at 12 o'clock, wrap clockwise (mirror for a full circle).
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- **Bass drives big moves** (scale, glow, position); **treble drives detail** (shimmer, flicker, edges); **RMS drives globals** (background brightness, overall energy).
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- Pick 2-3 animated properties — more looks noisy. Keep minimums above zero so quiet sections still have life.
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- **Band count**: 4 = background glow/pulse, 8 = bar charts, 16 = detailed EQ (default), 32 = dense radial layouts.
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- **Layering**: stack canvases with `z-index` — a background layer driven by bass/rms under a foreground layer driven by individual bands gives depth without per-element complexity.
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