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Pass no-go area polygons natively to BRouter

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BRouter supports a `polygons` parameter with full vertex coordinates.
We were approximating polygons as circles (centroid + max radius),
which poorly represented elongated or concave shapes.

Now passes polygon vertices directly — no approximation, exact
no-go boundaries.

Also removes unused haversineMeters helper and updates the spec.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Ullrich Schäfer 2026-04-03 10:31:43 +01:00
parent d2ff488f37
commit 3abea9d5a8
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2 changed files with 7 additions and 27 deletions
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31
apps/planner/app/lib/brouter.ts
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@ -52,7 +52,7 @@ export async function computeRoute(request: RouteRequest): Promise<EnrichedRoute
format,
tiledesc: "true",
});
if (nogoParam) params.set("nogos", nogoParam);
if (nogoParam) params.set("polygons", nogoParam);
return fetchSegment(`${BROUTER_URL}/brouter?${params}`);
}),
);
@ -180,40 +180,19 @@ function extractSurfacesFromMessages(properties: Record<string, unknown>): Map<n
}
/**
* Convert no-go area polygons to BRouter's `nogos` parameter format.
* BRouter accepts `lon,lat,radius` per no-go circle, separated by `|`.
* We approximate each polygon as a circle: centroid + max distance to any vertex.
* Convert no-go area polygons to BRouter's `polygons` parameter format.
* Format: lon1,lat1,lon2,lat2,...,lonN,latN separated by `|` per polygon.
*/
function noGoAreasToParam(areas: NoGoArea[]): string {
return areas
.map((area) => {
const pts = area.points;
if (pts.length === 0) return null;
// Centroid
const cLat = pts.reduce((s, p) => s + p.lat, 0) / pts.length;
const cLon = pts.reduce((s, p) => s + p.lon, 0) / pts.length;
// Max distance from centroid in meters (approximate)
const maxDist = Math.max(
...pts.map((p) => haversineMeters(cLat, cLon, p.lat, p.lon)),
);
return `${cLon},${cLat},${Math.ceil(maxDist)}`;
if (area.points.length < 3) return null;
return area.points.map((p) => `${p.lon},${p.lat}`).join(",");
})
.filter(Boolean)
.join("|");
}
function haversineMeters(lat1: number, lon1: number, lat2: number, lon2: number): number {
const R = 6371000;
const dLat = ((lat2 - lat1) * Math.PI) / 180;
const dLon = ((lon2 - lon1) * Math.PI) / 180;
const a =
Math.sin(dLat / 2) ** 2 +
Math.cos((lat1 * Math.PI) / 180) *
Math.cos((lat2 * Math.PI) / 180) *
Math.sin(dLon / 2) ** 2;
return R * 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
}
export function getBRouterUrl(): string {
return BROUTER_URL;
}