@particle-academy/fancy-motion

The scroll-driven timeline motion engine for the Fancy UI suite. The page is a video; scroll is the playhead.

Status: spine. Ships the TimelineDoc model + the pure scroll→snapshot tween engine + a MotionStage runtime player (vertical scrub). The EditMode timeline dock (authoring), per-keyframe snap scrolling, scene pinning, and the horizontal player are the next slices.

Model

Authoring is whole-page snapshots (Keynote-Magic-Move-for-scroll): arrange the page → drop a keyframe → rearrange → drop another. The engine tweens the diff between consecutive snapshots (elements matched by node id) as the playhead scrubs. Snap | Scroll is per-keyframe; Scenes pin the page and play an internal sub-sequence before releasing; both scroll axes are supported. Keyframes anchor proportionally (0..1) so they survive responsive resizing.

import { sampleTimeline, type TimelineDoc } from "@particle-academy/fancy-motion";
import { MotionStage } from "@particle-academy/fancy-motion/react";

// pure: resolve the snapshot at any playhead position
const snapshot = sampleTimeline(timeline, 0.5);

// runtime: scroll drives the morph, applied to [data-cms] elements
<MotionStage timeline={timeline}>{page}</MotionStage>;

fancy-cms references a TimelineDoc by timelineRef; this package owns the model, engine, dock, and player, and is reusable standalone.

MIT © Particle Academy

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