Levi Neuwirth
691f527e07
The layout time axis was inert: TimeAxisModel carried bare Vec<SpringSlotId>,
project()/affected_slots() ignored their arguments (returning the first slot /
all slots), nothing populated it, and nothing consumed it.
Now it carries ordered SlotPlacement { time, slot } entries and has real
behavior:
- project(time) returns the slot covering a time (greatest placement at or
before it; first when the query precedes them all);
- affected_slots(range) returns the slots in a half-open time range;
- slots() lists them in time order;
- with_placements populates and sorts the axis from resolved spring slots.
The spacing stage (to_constrained) now populates each region's axis from its
spring slots and carries the populated axis on ConstrainedLayoutRegion, so the
axis is a real, consumed artifact. Tests cover project/affected_slots semantics
and that spacing produces a per-region axis whose project() is a genuine
function of the queried time. DECISIONS updated.
This completes item 6 (and the whole v0 follow-up list, items 1-6 / M1-M5).
(The slot times are still the prototype's wall-clock spacing columns; mapping a
metric region's measure/beat grid to musical times is the next layer.)
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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