- src/map/assets/icons/: 9 placeholder SVGs (background plate, direction
arrow, 7 categories: rally-car / quad / ssv / motorcycle / runner /
hiker / default). Hand-authored simple silhouettes; replaced in
Phase 3.8 with the branded set.
- src/map/core/categories.ts: SpriteCategory/SpriteColor types,
mapCategoryToSprite() normaliser, inferColor() helper.
- src/map/core/sprite-preload.ts: idempotent preloadSprites() with
memoised promise, whenSpritesReady() alias, getSpriteRegistry()
read-only access, installSprites(map) for the mapReady flow.
Composition pipeline draws the plate + composites a tinted icon
centred on it (category sprites) or tints the arrow alone (direction
sprites). Tint via canvas globalCompositeOperation: 'source-in'.
- src/main.tsx: void preloadSprites() fired at boot; the promise is
memoised so mapReady flow awaits the same instance.
- src/map/core/map-view.tsx: onStyleData() awaits whenSpritesReady()
AND _map.loaded() before installing sprites and flipping mapReady
true. Sprites reinstall on every style swap.
Registry: 7 categories x 4 colours + 4 direction-only entries = 32
total. ~160KB in memory.
Deviations:
1. Direction sprites have no plate (it's a separate symbol layer in
2.5 overlaid on the device sprite; double-plate would look wrong).
2. Hardcoded the design-system palette (#2E8C4A / #E8412B / #0E0E0C /
#2563C8) directly. When 3.8 lands, these rebind to TRM tokens via
CSS variables.
- pnpm add maplibre-google-maps (runtime; lazy-imported on Google use).
- src/map/core/styles.ts: BasemapDescriptor model with four entries
(Esri Satellite / OpenTopoMap / OSM / Google Satellite).
Google entry gated on cfg.googleMapsKey via available(cfg).
styleCustom() builds a single-raster-source MapLibre style with a
glyphs URL for future label rendering.
ensureGoogleProtocol() lazy-loads maplibre-google-maps + addProtocol
on first use; _googleRegistered guards re-registration.
- src/map/core/map-pref-store.ts: Zustand + persist middleware
(key: trm-map-prefs, version: 1). Holds basemapId + setBasemap.
- src/map/core/basemap-switcher.tsx: floating control top-right of
<MapView>. Filters by available(cfg), highlights active, applies via
getMap().setStyle(). Mount-time bootstrap (no UI state) + user-driven
onClick (with switching state) split to satisfy React 19's
react-hooks/set-state-in-effect rule.
- src/routes/_authed/monitor.tsx: renders <BasemapSwitcher /> as a
child of <MapView>.
- src/vite-env.d.ts: ambient module declaration for
maplibre-google-maps (no .d.ts ships in the package).
Deviations:
- BasemapDescriptor.style is buildStyle(cfg): StyleSpecification, not
the spec's StyleSpecification|string union. Google needs the cfg key
at build time; uniform function shape across all entries is cleaner.
- Bootstrap apply path doesn't use the switching UI state (no visual
feedback needed during the silent first-paint flip from OSM to user
preference). User-click path keeps setSwitching for the in-flight
indicator.
Bundle: MapLibre is now its own chunk (1MB / 273KB gz), shared across
maplibre consumers. Main bundle 371KB / 114KB gz.
- pnpm add maplibre-gl + -D @types/geojson.
- src/map/core/styles.ts: defaultStyle (OSM raster bootstrap; 2.2
replaces with the basemap-switcher descriptor table).
- src/map/core/map-view.tsx: module-level Map singleton lazily created
on first <MapView> mount, attached to a class="trm-map-host" detached
<div> that React refs append/remove on mount/unmount. Style-data
lifecycle flips mapReady false on every styledata event, polls
loaded() at 33ms intervals, flips ready true once the style is
loaded — the canonical MapLibre style-swap dance.
- Exports getMap()/getMapReady()/subscribeMapReady()/useMapReady (via
useSyncExternalStore for SSR-safe + concurrent-safe reads). getMap()
throws if called pre-mount; the explicit failure mode beats a
null-able top-level export.
- src/routes/_authed/monitor.tsx: new /monitor route, full-viewport
<MapView /> for 2.1 (no children — subsequent tasks plug in here).
- src/routes/_authed/index.tsx: home-page card now links to /monitor.
- eslint.config.js: override for src/map/** + src/live/** disables
react-refresh/only-export-components. Same pattern as the existing
overrides for shadcn primitives and route files.
Deviation: spec sketched a top-level `map` constant export; implemented
as `getMap(): MapLibreMap` (a function) so the singleton stays lazy
until <MapView> mounts. Top-level constant would either force eager
init (breaks SSR/tests) or be nullable (footgun). The function form
throws a clear error if called pre-mount.
Bundle: /monitor lazy chunk is 1MB raw / 274KB gzipped (MapLibre + CSS).
Other routes unaffected. Vite chunk-size warning is harmless.
Nine task files matching Phase 1's shape (Goal / Deliverables / Spec /
Acceptance / Risks / Done). README updated with full sequencing diagram,
files-modified outline, tech stack additions, design rules, and phase
acceptance.
| # | Task |
| --- | --------------------------------------------------------------------- |
| 2.1 | MapView singleton + mapReady gate |
| 2.2 | Tile-source switcher (Esri / OpenTopoMap / OSM / optional Google) |
| 2.3 | Sprite preload — 7 racing categories x 4 colour variants |
| 2.4 | WS client + rAF coalescer + Zustand position store + connection store |
| 2.5 | MapPositions — clustered + selected sources |
| 2.6 | MapTrails — bounded ring buffer, polyline rendering |
| 2.7 | Event picker — TanStack Query + WS subscription orchestration |
| 2.8 | Camera control trio — default-fit / selected-follow / one-shot |
| 2.9 | Connection status + per-device last-seen indicators |
Sequencing: 2.1 and 2.4 are parallel foundations (singleton vs data
pipeline). Once both land, 2.5 / 2.6 / 2.7 / 2.9 fan out independently.
2.2 / 2.3 only need 2.1. 2.8 sits at the end on top of 2.1 + 2.5.
Each task documents its deliverables down to file paths + interface
shapes, includes concrete code sketches in the Specification, lists
explicit out-of-scope items, and surfaces risks for the implementer
to think about. An agent (or future me) can pick up any single task
and ship it without re-deriving the design from the wiki.
Resolved Phase 2 design decisions baked into the task files:
- Trails: flat-colour-per-device for v1, defer speed-coloured segments
to a Phase 3 polish task.
- Cluster params: 14/50 (traccar default); tune after seeing real data.
- Event picker placement: top-left dropdown.
- Multi-event: out — single-select, one event at a time.
- Stale-position visual: fade icon opacity; defer warning badges.
julian