34 lines
1.9 KiB
Markdown
34 lines
1.9 KiB
Markdown
# WIP: Iterative buildCells rewrite
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## What's done
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- Block has `weight uint64`, `triggers []*Trigger`, `topRow int` fields
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- TriggerSource and TriggerTarget have `block *Block` pointer fields
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- `linkTriggers()` resolves string IDs to block pointers, populates `block.triggers`
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- `computeWeights()` sets weight = `(cue index) << 32` + 0 if cue-ended, 1 otherwise
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- Higher weight = more likely to be moved
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- Later cues = higher weight
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- `buildCells()` is rewritten to be iterative:
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1. Init: cues get sequential topRow, non-cues start at 0
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2. Loop (trigger pass): move target blocks so trigger source row >= target hook row
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3. Loop (overlap pass): sort same-track blocks by (topRow, weight), push overlaps to prev end + 1
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4. After convergence: move each cue to max row of its triggered cells
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5. `emitCells()` creates actual TimelineCell objects from computed topRows
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- Test uses `BuildTimelineDebug` with testWriter for debug output
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## What's broken
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- Cue track comes out unordered after the cue-move step (cues placed at their highest triggered cell row, which scrambles scene order)
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- Gap padding in emitCells skips cue track (`if block.Type != "cue"`) so cue cell rows don't match topRow
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- The +1 gap between blocks may be wrong (was +2, changed to +1)
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- assignRows still can't converge after buildCells — off-by-one misalignments between cue rows and target rows
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## Key design decisions
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- topRow coordinate space should include gap cells (emitCells just places cells at topRow)
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- blockHeight: cue=0 (own track, can overlap), other=4
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- Gap between same-track blocks = 1 row (chain or gap cell)
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- Cross-track alignment still handled by assignRows solver after buildCells
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## Next steps
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- Fix cue track: need gap padding on cue track too so cell rows match topRow
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- May need to rethink cue-move step — moving cues to highest triggered row scrambles cue order
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- Verify topRow math matches actual emitted cell rows end-to-end
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