The pre-existing `Deltas` helper used the height to wrap the x-axis,
which silently produced wrong values on any rectangular galaxy
(`w != h`). Square galaxies — the only configuration the engine
ships today — masked the bug, so it stayed in tree.
`Deltas` is now a thin wrapper around the new `ShortestDelta(a, b,
size)`, which returns the signed per-axis shortest delta on a 1-D
circle (range `(-size/2, size/2]`). The signed flavour is what the
Phase 19 ship-group renderer needs to draw an IncomingGroup
trajectory across the torus seam; `Deltas` continues to return the
pair of absolute deltas for distance computation.
Adds `pkg/calc/map_test.go` with table-driven coverage for both
helpers, including a regression that exercises the rectangular
case the bug was hiding behind, and the half-circumference
tie-break.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
The cargo-route picker filtered out unidentified planets, so an
early-game player who had spotted but not surveyed a destination
could not configure a route to it — the engine has no such
restriction (`game/internal/controller/route.go.PlanetRouteSet`
only checks ownership of the origin and `util.ShortDistance(...) <=
FligthDistance`). Drop the unidentified guard and document the
contract in `cargo-routes-ux.md` plus a comment over `reachableSet()`.
Pick-mode dim now drops both alpha and tint on out-of-reach
planets so bright shapes (`STYLE_LOCAL` is `0x6dd2ff`) collapse
into a single muted gray. The single-channel `dimAlpha=0.3` was too
gentle against the dark theme — the user reported the dim wasn't
visible. Tighten to `dimAlpha=0.35 + dimTint=0x303841`; restore
both on tear-down.
Also threads through the user's `pkg/calc/race.go.FligthDistance`
addition: `calc-bridge.md` records the new Go-side reference (the
engine's `Race.FlightDistance()` already wraps it), and the picker
comment points at the canonical formula location.
Tests:
- `inspector-planet-cargo-routes.test.ts` adds two cases — a
reach-spans-every-kind case (own + foreign + uninhabited +
unidentified all picked when in range) and a successful pick to
an unidentified destination.
- All 356 vitest cases + chromium-desktop / webkit-desktop e2e
cargo-routes pass.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Ilia Denisov