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Maurice
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Without stay times the bookend leg drew unless a carrier or a 2000 km edge stop disproved it, which is exactly the reported car trip: home five hundred kilometres away, routed back to the hotel after check-out. The disproof threshold is a day-trip distance now, and the route optimizer anchors through the same rule on desktop and mobile instead of unconditionally, so drawing and optimizing agree.
51 lines
2.3 KiB
TypeScript
51 lines
2.3 KiB
TypeScript
/**
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* Straight-line distance between two coordinates, in kilometres.
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*
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* Lifted out of useTransportRoutes so the day-route builder can share the one
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* implementation instead of adding a fourth copy. The map overlays keep their own
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* `[lat, lng]`-tuple variants — different call shape, and they only sum arc lengths.
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*/
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export function haversineKm(a: { lat: number; lng: number }, b: { lat: number; lng: number }): number {
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const R = 6371
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const dLat = (b.lat - a.lat) * Math.PI / 180
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const dLng = (b.lng - a.lng) * Math.PI / 180
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const la1 = a.lat * Math.PI / 180
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const la2 = b.lat * Math.PI / 180
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const h = Math.sin(dLat / 2) ** 2 + Math.cos(la1) * Math.cos(la2) * Math.sin(dLng / 2) ** 2
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return 2 * R * Math.asin(Math.sqrt(h))
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}
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/**
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* Beyond this straight-line distance a leg of a day's route is not a drive anyone
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* makes between two stops — it is a booking endpoint that landed next to a local
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* stop, and the road router answers such a pair with NoRoute (#2133). The same
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* 2000 km useTransportRoutes has always used for booking geometry.
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*
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* Deliberately only ever applied to a leg that touches a TRANSPORT endpoint. Two
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* real places 2000 km apart are a long drive someone planned; an airport 2000 km
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* from the stop before it never is.
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*/
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export const MAX_DRIVE_KM = 2000
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/** Whether two points are close enough to plausibly be joined by a road leg. */
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export function withinDriveRange(a: { lat: number; lng: number }, b: { lat: number; lng: number }): boolean {
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return haversineKm(a, b) <= MAX_DRIVE_KM
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}
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/**
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* How far a day out of a hotel and back plausibly reaches, straight-line.
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*
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* Consulted where a stay records no check-in/check-out time and the shape of the day is
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* therefore a guess (#2157): a stop inside this radius is somewhere the hotel sent you out
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* to for the day, a stop outside it is where you travelled from or to. It has to be a
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* road-day radius rather than the booking-geometry MAX_DRIVE_KM above: 2000 km spans the
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* whole of Europe, so every car journey on the continent passed as a day trip and kept the
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* phantom hotel leg the issue reported.
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*/
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export const MAX_DAY_TRIP_KM = 150
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/** Whether a stop is near enough a hotel to be a day out from it and back. */
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export function withinDayTripRange(a: { lat: number; lng: number }, b: { lat: number; lng: number }): boolean {
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return haversineKm(a, b) <= MAX_DAY_TRIP_KM
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}
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