A modular and adaptable timeline

The timeline is controlled by the host application. The component emits playback and seek requests, while the host clock writes the resulting position back through currentTimeMillis.

• Use the top menu to move the playhead by ten seconds.
• Use Shuffle in the top menu to redistribute the clips and reorder the current tracks.
• Use the loop button in the transport area to repeat the selected range.
• Drag the generated sources to create video, audio, text, or other clips.
• Use the standard time and zoom controls rendered by the component.
• Play the timeline to open the draggable Pac-Man view. Fully eaten clips disappear and increase the counter; clips interrupted by a lane change stay shortened and do not count.

This simplified excerpt uses the same controlled clock as the timeline. Three.js renders the miniature ruler and clips, while the current time selects the clip to visit, moves Pac-Man from its start toward its end, and reduces the remaining clip width. Web Audio generates the chomp effect and an arcade-inspired fallback loop.

<wa-popup id="pacman-popup" anchor="studio-timeline" placement="top-end">
    <canvas id="pacman-canvas" aria-label="Pac-Man timeline companion"></canvas>
</wa-popup>

import * as THREE from 'three'

const clips = timeline.tracks
    .flatMap(track => track.clips.map(clip => ({...clip, trackId: track.id})))
    .sort((left, right) => left.start - right.start)

const pacman = new THREE.Group()
const pacmanBody = new THREE.Mesh(
    new THREE.CircleGeometry(0.36, 40, 0.2, (Math.PI * 2) - 0.4),
    new THREE.MeshBasicMaterial({
        color: getComputedStyle(document.documentElement).getPropertyValue('--wa-color-brand-60').trim() || '#ffd23f',
    }),
)
pacman.add(pacmanBody)

const updatePacman = (timeMillis, playing) => {
    const activeIndex = clips.findLastIndex(clip => clip.start * 1000 <= timeMillis)
    const clip = clips[activeIndex]
    if (!clip) return

    const nextClip = clips[activeIndex + 1]
    const progress = Math.min(1, Math.max(0,
        (timeMillis - (clip.start * 1000)) / ((clip.end - clip.start) * 1000),
    ))
    const changesTrack = nextClip && nextClip.trackId !== clip.trackId
    const biteEndMillis = changesTrack
        ? Math.min(clip.end * 1000, nextClip.start * 1000)
        : clip.end * 1000
    const visibleProgress = Math.min(progress, Math.max(0,
        (biteEndMillis - (clip.start * 1000)) / ((clip.end - clip.start) * 1000),
    ))
    pacman.position.copy(positionAtClip(clip, progress))
    clipMeshes[activeIndex].scale.x = Math.max(0.04, 1 - visibleProgress)

    const eatenCount = clips.filter((candidate, index) => {
        const followingClip = clips[index + 1]
        const changesLane = followingClip && followingClip.trackId !== candidate.trackId
        const candidateBiteEnd = changesLane
            ? Math.min(candidate.end * 1000, followingClip.start * 1000)
            : candidate.end * 1000
        return candidateBiteEnd === candidate.end * 1000 && timeMillis >= candidate.end * 1000
    }).length
    const almostEatenCount = clips.filter((candidate, index) => {
        const followingClip = clips[index + 1]
        const changesLane = followingClip && followingClip.trackId !== candidate.trackId
        const candidateBiteEnd = changesLane
            ? Math.min(candidate.end * 1000, followingClip.start * 1000)
            : candidate.end * 1000
        return candidateBiteEnd > candidate.start * 1000
            && candidateBiteEnd < candidate.end * 1000
            && timeMillis >= candidateBiteEnd
    }).length
    const result = eatenCount === clips.length
        ? 'Win'
        : almostEatenCount * 2 >= clips.length
            ? 'Lose'
            : 'In progress'
    // Render eatenCount, almostEatenCount, and result in the Pac-Man popup footer.

    if (playing) {
        pacmanAudio.playChomp()
    }
}