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follows glyph: two complete offset arrows — no convergence, no head merge

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Owner rejected the first cut: two tails converging on one shared head
reads as two arrows feeding a single point, not as parallel strokes.

- followsEdgeGeometry now returns two COMPLETE regular arrows (own shaft
  + own head each), translated ±half-gap along the edge normal —
  parallel shafts AND parallel heads, nothing converges. Offset shafts
  never clip the source disc; offset tips land a hair outside the target
  disc edge (accepted price of parallel heads).
- Gap floors: screen-anchored 3x edgeWidth (dominates at fit/zoomed-out,
  unchanged look) OR head-anchored 1.2x arrowLen (world) — without the
  head floor, the world-scaled heads merge into one blob at deep zoom
  (measured: one 10px band at 5x). max() keeps >= 0.4 arrowLen of clear
  space between the heads past the ~1.5x crossover.
- Vision doc revised (2026-09-15) to record the rejection.

Live-verified at 5x fit zoom: two shafts (11.5px gap = widened floor),
two separate ~8px-base heads with clear space between. At fit: 3px gap,
two heads, unchanged. Gates: tsc, 435/435 tests, lint, build.
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amosblomqvist
2026-09-15 08:20:04 +03:00
parent e9348b7baf
commit e8fa9403ca
3 changed files with 106 additions and 62 deletions
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docs/vision-edge-glyph.md
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@@ -21,7 +21,8 @@ Dash patterns break under our **constant screen-space stroke width**: the dash a
The renderer is the custom 2D canvas; edges draw in the edge layer with shafts + arrowheads from `arrowGeometry` (sigma-style head, prerequisite → dependent). For `follows`:
- Both shafts offset along the edge normal by a **fixed screen-space gap**, converging on a **shared single arrowhead**.
- Both shafts offset along the edge normal by a **fixed screen-space gap**.
- **REVISED 2026-09-15 (owner rejected the first cut):** the converged variant — two tails merging into one shared arrowhead — read as two arrows feeding a single point, not as parallel strokes. The glyph is two **complete regular arrows** (own shaft + own head each) translated ±half-gap along the normal: parallel shafts AND parallel heads, nothing converges.
- The gap is proportional to the constant stroke width — a constant visual ratio at every zoom level.
- **No LOD collapse (withdrawn 2026-09-14).** The earlier idea of collapsing to a single shaft below a stroke-width threshold assumed width shrinks with zoom — it doesn't; stroke width is constant on screen, so the double shaft renders identically at every zoom level. Simpler than proposed: nothing to gate.