Song274Transect draws Route 274 in its true shape (the "Ground" view of
song-274/route/274-transect.html) and plays it along with the song.
- data.ts: reads song-274/route/ at load time (lyrics index, roster, route and
the optional east/west stubs); nothing is copied into the code. Only sung
nodes are shown; districts and 東に続く light nothing.
- progress.ts: a "covered so far" paint over the dimmed road. Its head is pinned
to each sung object's km as that line starts and glides between pins on a
monotone cubic, so it never runs backwards. After 東に続く it runs out along
the east stub; the west stub is always painted.
- camera.ts: fixed close zoom during each narration part (lines under 20 s
apart), following a Gaussian-smoothed head; pull back to frame the covered
road plus some road ahead during breaks, and to the full map after the lyric.
- nodeAnimation.ts: lightUp / switchOff as reusable functions over a NodeLook,
with long lines switching off after MAX_LIT_S.
- palette.ts: every colour as a named token (dark default, light alongside),
including shrine and railway families.
remotion.config.ts sets song-274/ as the public dir so staticFile() reaches the
song's audio/ and route/ in place.
Verified: eslint + tsc clean; stills checked across parts, breaks and the ending.
Render with --muted and add audio with ffmpeg: Remotion's own AAC lands 42.75 ms
late.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01PLt25nCVMsoroKALYUBu6u
mikkeli
irene