4aiman
a52e998fb6
Analysis in docs/brouter-findings.md: how BRouter knows roads (.rd5 segments), routes and reaches low elevation gain (profile uphill/downhill cost + kinematics), the three call surfaces, and an evaluation of two ideas — fill GPS gaps along roads, and offline waypoint route planning. License is MIT; the engine has no desktop-only deps, so it embeds on Android ART. Stage 1 (embed + bridge, compiles into the apk; on-device route not yet run): - vendored brouter-1.6.3-all.jar into the Android module (dexes cleanly) and bundled the trekking/shortest profiles + lookups.dat as assets, copied to files/brouter/profiles2 on launch - MainActivity: a brouter_command.txt handler on the existing FileObserver runs btools.router.RoutingEngine off the UI thread (recipe taken via javap from ServerHandler) and returns the track as GPX - Rust brouter_route command: same file bridge as GPS (request + command, poll for the result), registered in the invoke handler - frontend/js/router.js: BRouter.route(points, profile) -> GPX (parseRouteGPX) - LICENSE-brouter (MIT notice) kept alongside the vendored engine Segments (.rd5, ~13-23 MB per 5x5 tile) are delivered later (Stage 2, wired download inside BalDav). IMPLEMENTATION_PLAN.md tracks the 5 stages.
20 lines
962 B
JavaScript
20 lines
962 B
JavaScript
// Offline routing via the embedded BRouter engine.
|
|
// JS → Rust command `brouter_route` → Kotlin (btools.router) → GPX back.
|
|
// BRouter.route(points, profile):
|
|
// points — array of [lon, lat] pairs (BRouter order; NOT [lat, lon])
|
|
// profile — "trekking" (planning) | "shortest" (gap fill); default "trekking"
|
|
// Returns a GPX string (parse with parseRouteGPX) or throws with the engine's error.
|
|
// Needs the region .rd5 segments present on device (files/brouter/segments4).
|
|
window.BRouter = {
|
|
async route(points, profile) {
|
|
let lonlats = JSON.stringify((points || []).map(p => [p[0], p[1]]));
|
|
let raw = await window.__TAURI__.core.invoke("brouter_route", {
|
|
lonlats,
|
|
profile: profile || "trekking",
|
|
});
|
|
let res;
|
|
try { res = JSON.parse(raw); } catch (e) { throw new Error("brouter: bad result: " + raw); }
|
|
if (!res.ok) throw new Error("brouter: " + (res.error || "unknown error"));
|
|
return res.gpx;
|
|
},
|
|
};
|