Claude
ae50ac39ac
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01X48pE4bzjHej8w9HyZXCjb
418 lines
20 KiB
Python
418 lines
20 KiB
Python
"""Hält einen aufbereiteten Bahn-Fahrplan im Speicher und berechnet daraus Zugpositionen
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entlang der Strecke (Fahrplan + Echtzeit-Verspätung -> Position auf dem Streckenverlauf)."""
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import csv
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import datetime as dt
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import json
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import math
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import mmap
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import re
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from array import array
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from bisect import bisect_right
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from pathlib import Path
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from zoneinfo import ZoneInfo
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from . import config as C
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TZ = ZoneInfo(C.TZ)
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CAL_DAYS = 14 # so viele Tage Ausnahmen aus calendar_dates laden (die Datei ist riesig)
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def hms(s: str) -> int:
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h, m, sec = s.split(":")
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return int(h) * 3600 + int(m) * 60 + int(sec)
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def day_start(d: dt.date) -> float:
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# GTFS-Zeiten zählen ab "Mittag minus 12 h" – stimmt auch an Tagen mit Zeitumstellung
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return dt.datetime(d.year, d.month, d.day, 12, tzinfo=TZ).timestamp() - 43200
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def read(path: Path):
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with open(path, encoding="utf-8-sig", newline="") as f:
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r = csv.reader(f)
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h = {k: i for i, k in enumerate(next(r))}
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for row in r:
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yield h, row
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def xy(lon, lat, lat0): # lokale Projektion in Metern, reicht für Abstände entlang einer Strecke
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return lon * 111320 * math.cos(math.radians(lat0)), lat * 110540
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BRAKE_M = 150 # so viele Meter vor/nach einem Halt bremst bzw. beschleunigt der Zug
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def travelled(length: float, duration: float, t: float) -> float:
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"""Zurückgelegte Meter auf einem Abschnitt: sanft anfahren, konstant fahren, sanft bremsen
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(trapezförmiges Geschwindigkeitsprofil), statt mit voller Geschwindigkeit in den Halt zu fahren."""
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if length <= 0 or duration <= 0:
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return 0.0
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t = max(0.0, min(t, duration))
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ta = min(duration / 2, 2 * BRAKE_M * duration / (length + 2 * BRAKE_M)) # Zeit fürs Anfahren/Bremsen
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vmax = length / (duration - ta)
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a = vmax / ta
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if t < ta:
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return 0.5 * a * t * t
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if t > duration - ta:
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return length - 0.5 * a * (duration - t) ** 2
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return 0.5 * a * ta * ta + vmax * (t - ta)
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# Gattungen des Fernverkehrs; alles andere (RE, RB, S, R, TER, …) gilt als Nahverkehr
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LONG_DISTANCE = {"ICE", "IC", "ICN", "ICD", "EC", "ECE", "ECM", "EN", "NJ", "RJ", "RJX", "TGV", "OUIGO", "LYRIA",
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"THA", "EST", "EUROSTAR", "EUROCITY", "NIGHTJET", "EUROPEAN", "FLX", "IR", "PE", "D"}
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# Frankreich (SNCF): Gattung steht nur in der Trip-ID ("…_F:OUI:…"), die Linie heisst oft "INCONNU"
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FR_CATEGORY = {"OUI": "TGV", "OGO": "OUIGO", "LYR": "Lyria", "ICE": "ICE", "IC": "IC", "ICN": "IC",
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"TER": "TER", "CTE": "TER", "NAV": "Navette", "TRN": "TER", "CRE": "TER"}
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FR_TRIP = re.compile(r"_F:([A-Z]+):")
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# Niederlande (OVapi): lange Gattungsnamen kürzen, damit die Beschriftung auf der Karte passt
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LINE_ALIAS = {"Intercity": "IC", "Intercity direct": "ICD", "Sprinter": "SPR", "Nightjet": "NJ", "Eurocity": "EC"}
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LINE_PREFIX = re.compile(r"^(Stoptrein|Sneltrein) (?=\S)") # "Stoptrein RS4" -> "RS4"
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def long_distance(cat: str, line: str) -> bool:
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# Schweiz: Gattung in route_desc; gtfs.de: nur in der Linie ("ICE 75", "IC 3")
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m = re.match(r"[A-Za-z]+", cat or line or "")
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return bool(m) and m.group(0).upper() in LONG_DISTANCE
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MIN_DWELL = 40 # s; im Fahrplan steht oft Ankunft = Abfahrt, dann würde der Zug nie sichtbar halten
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def with_min_dwell(arr, dep):
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"""Halte mit weniger als MIN_DWELL Haltezeit für die Animation verlängern: etwas früher ankommen,
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etwas später abfahren – höchstens ein Viertel der Fahrzeit davor/danach."""
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pa, pd = list(arr), list(dep)
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for k in range(1, len(arr) - 1):
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short = MIN_DWELL - (dep[k] - arr[k])
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if short > 0:
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h = min(short / 2, (arr[k] - dep[k - 1]) / 4, (arr[k + 1] - dep[k]) / 4)
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if h > 0:
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pa[k], pd[k] = arr[k] - h, dep[k] + h
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return pa, pd
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def simplify(p: list, tol_m: float, fixed=()) -> list:
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"""Douglas-Peucker auf [lon, lat, t]-Punkten (Toleranz in Metern, grob über die Breite umgerechnet).
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Punkte in `fixed` bleiben immer erhalten."""
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if len(p) < 3:
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return p
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kx = 111320 * math.cos(math.radians(p[0][1]))
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keep = {0, len(p) - 1, *fixed}
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cuts = sorted(keep)
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stack = list(zip(cuts, cuts[1:]))
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while stack:
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a, b = stack.pop()
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(x1, y1), (x2, y2) = (p[a][0] * kx, p[a][1] * 110540), (p[b][0] * kx, p[b][1] * 110540)
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dx, dy = x2 - x1, y2 - y1
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n = math.hypot(dx, dy)
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best, idx = 0.0, -1
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for i in range(a + 1, b):
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x, y = p[i][0] * kx, p[i][1] * 110540
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d = abs(dy * x - dx * y + x2 * y1 - y2 * x1) / n if n else math.hypot(x - x1, y - y1)
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if d > best:
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best, idx = d, i
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if best > tol_m:
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keep.add(idx)
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stack += [(a, idx), (idx, b)]
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return [p[i] for i in sorted(keep)]
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class Feed:
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def __init__(self, path: Path, today: dt.date | None = None):
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self.path = path
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self.meta = json.loads((path / "meta.json").read_text())
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self.version = self.meta["feed_version"]
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self.stop_index, self.stop_name, self.stop_lat, self.stop_lon, self.stop_platform = {}, [], [], [], []
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self.stop_group = array("i") # Bahnhof eines Halts (alle Gleise eines Bahnhofs -> gleiche Zahl)
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groups = {}
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for h, r in read(path / "stops.txt"):
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parent = r[h["parent_station"]] if "parent_station" in h else ""
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self.stop_group.append(groups.setdefault(parent or r[h["stop_id"]], len(groups)))
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self.stop_index[r[h["stop_id"]]] = len(self.stop_name)
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self.stop_name.append(r[h["stop_name"]])
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self.stop_lat.append(float(r[h["stop_lat"]]))
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self.stop_lon.append(float(r[h["stop_lon"]]))
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self.stop_platform.append(r[h["platform_code"]] if "platform_code" in h else "")
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agencies = {r[h["agency_id"]]: r[h["agency_name"]] for h, r in read(path / "agency.txt")}
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self.routes = {}
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for h, r in read(path / "routes.txt"):
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line = LINE_PREFIX.sub("", r[h["route_short_name"]] or r[h.get("route_long_name", 0)])
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self.routes[r[h["route_id"]]] = {
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"line": LINE_ALIAS.get(line, "" if line == "INCONNU" else line),
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"cat": r[h["route_desc"]] if "route_desc" in h else "",
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"agency": agencies.get(r[h["agency_id"]], "") if "agency_id" in h else "",
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}
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self.trip_index, self.trip_ids, self.trip_route, self.trip_service = {}, [], [], []
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self.trip_headsign, self.trip_number, self.trip_shape = [], [], []
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for h, r in read(path / "trips.txt"):
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self.trip_index[r[h["trip_id"]]] = len(self.trip_route)
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self.trip_ids.append(r[h["trip_id"]])
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self.trip_route.append(r[h["route_id"]])
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self.trip_service.append(r[h["service_id"]])
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self.trip_headsign.append(r[h["trip_headsign"]] if "trip_headsign" in h else "")
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self.trip_number.append(r[h["trip_short_name"]] if "trip_short_name" in h else "")
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self.trip_shape.append(r[h["shape_id"]] if "shape_id" in h else "")
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route = self.routes[r[h["route_id"]]]
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m = FR_TRIP.search(r[h["trip_id"]]) if not route["cat"] else None
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if m:
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route["cat"] = FR_CATEGORY.get(m.group(1), m.group(1))
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if self.trip_headsign[-1].isdigit() and not self.trip_number[-1]: # SNCF: Ziel = Zugnummer
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self.trip_number[-1], self.trip_headsign[-1] = self.trip_headsign[-1], ""
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for route in self.routes.values():
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route["line"] = route["line"] or route["cat"]
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route["fv"] = long_distance(route["cat"], route["line"])
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# Haltezeiten flach in Arrays; off[i]..off[i+1] sind die Halte von Fahrt i
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n = len(self.trip_route)
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self.off = array("i", [0]) * (n + 1)
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self.st_stop, self.st_seq, self.st_arr, self.st_dep = array("i"), array("i"), array("i"), array("i")
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self.st_dist = array("f") # Meter entlang des Streckenverlaufs (von pfaedle), -1 = unbekannt
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rows = {}
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for h, r in read(path / "stop_times.txt"):
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dist = r[h["shape_dist_traveled"]] if "shape_dist_traveled" in h else ""
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rows.setdefault(self.trip_index[r[h["trip_id"]]], []).append(
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(int(r[h["stop_sequence"]]), self.stop_index[r[h["stop_id"]]], hms(r[h["arrival_time"]]),
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hms(r[h["departure_time"]]), float(dist) if dist else -1.0))
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for ti in range(n):
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self.off[ti] = len(self.st_stop)
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for seq, s, a, d, m in sorted(rows.pop(ti, ())):
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self.st_seq.append(seq)
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self.st_stop.append(s)
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self.st_arr.append(a)
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self.st_dep.append(d)
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self.st_dist.append(m)
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self.off[n] = len(self.st_stop)
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for ti in range(n): # gtfs.de liefert kein Fahrtziel: dann der letzte Halt
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if not self.trip_headsign[ti] and self.off[ti + 1] > self.off[ti]:
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self.trip_headsign[ti] = self.stop_name[self.st_stop[self.off[ti + 1] - 1]]
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self.shape_index, self.shape_data = {}, None
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if (path / "shapes.bin").exists() and (path / "shapes.bin").stat().st_size:
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self.shape_index = json.loads((path / "shapes.json").read_text())
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with open(path / "shapes.bin", "rb") as f:
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self.shape_data = memoryview(mmap.mmap(f.fileno(), 0, access=mmap.ACCESS_READ)).cast("f")
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self.calendar = {}
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for h, r in read(path / "calendar.txt") if (path / "calendar.txt").exists() else (): # SNCF: nur Ausnahmen
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self.calendar[r[h["service_id"]]] = (
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[r[h[d]] == "1" for d in ("monday", "tuesday", "wednesday", "thursday", "friday", "saturday", "sunday")],
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r[h["start_date"]], r[h["end_date"]])
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today = today or dt.datetime.now(TZ).date()
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self.cal_from = today - dt.timedelta(days=1)
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self.cal_until = today + dt.timedelta(days=CAL_DAYS)
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window = {(self.cal_from + dt.timedelta(days=i)).strftime("%Y%m%d") for i in range(CAL_DAYS + 2)}
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self.exceptions = {} # datum -> {service_id: 1 (fährt) | 2 (fährt nicht)}
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cd = path / "calendar_dates.txt"
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if cd.exists():
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with open(cd, encoding="utf-8-sig") as f:
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h = next(f).strip().replace('"', "").split(",") # Spaltenreihenfolge ist je Quelle anders
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si, di, ti_ = h.index("service_id"), h.index("date"), h.index("exception_type")
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for line in f:
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v = line.rstrip("\r\n").replace('"', "").split(",") # kurze Datei ohne Kommas in Werten
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if v[di] in window:
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self.exceptions.setdefault(v[di], {})[v[si]] = int(v[ti_])
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self._day_cache = {}
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self._geom_cache = {}
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# ---------- Kalender ----------
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def trips_on(self, d: dt.date):
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"""Fahrten eines Betriebstags, sortiert nach Abfahrt: (start, ende, trip_index)."""
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if d not in self._day_cache:
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ds = d.strftime("%Y%m%d")
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exc = self.exceptions.get(ds, {})
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active = {sid for sid, (days, a, b) in self.calendar.items() if a <= ds <= b and days[d.weekday()]}
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active |= {sid for sid, t in exc.items() if t == 1}
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active -= {sid for sid, t in exc.items() if t == 2}
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lst = sorted((self.st_dep[self.off[ti]], self.st_arr[self.off[ti + 1] - 1], ti)
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for ti, sid in enumerate(self.trip_service)
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if sid in active and self.off[ti + 1] - self.off[ti] >= 2)
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if len(self._day_cache) > 4:
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self._day_cache.clear()
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self._day_cache[d] = lst
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return self._day_cache[d]
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def covers(self, d: dt.date) -> bool:
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return self.cal_from <= d <= self.cal_until
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# ---------- Geometrie ----------
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def geometry(self, ti: int):
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"""Streckenverlauf einer Fahrt: Punkte, kumulierte Meter, Meter-Position jedes Halts.
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Ohne (brauchbaren) Streckenverlauf: Luftlinie zwischen den Halten."""
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o0, o1 = self.off[ti], self.off[ti + 1]
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key = (self.trip_shape[ti], tuple(self.st_stop[o0:o1]))
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g = self._geom_cache.get(key)
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if g:
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return g
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shp = self.shape_index.get(self.trip_shape[ti])
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stop_d = list(self.st_dist[o0:o1])
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if shp and shp[1] >= 2 and min(stop_d) >= 0:
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v = self.shape_data[shp[0] * 3:(shp[0] + shp[1]) * 3].tolist()
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pts, cum = list(zip(v[0::3], v[1::3])), v[2::3]
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else:
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pts = [(self.stop_lon[s], self.stop_lat[s]) for s in self.st_stop[o0:o1]]
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lat0 = pts[0][1]
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P = [xy(lon, lat, lat0) for lon, lat in pts]
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cum = [0.0]
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for (x1, y1), (x2, y2) in zip(P, P[1:]):
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cum.append(cum[-1] + math.hypot(x2 - x1, y2 - y1))
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stop_d = cum
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if len(self._geom_cache) > 20000:
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self._geom_cache.clear()
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g = (pts, cum, stop_d)
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self._geom_cache[key] = g
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return g
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def track(self, ti: int, dists: list, step: float, tolerance: float = 3.0) -> list:
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"""Gleispunkte von der aktuellen Position bis zur Position in len(dists)-1 Schritten, je mit der
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Zeit (s ab jetzt), zu der der Zug dort ist. Gerade Stücke werden auf ~3 m vereinfacht."""
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pts, cum, _ = self.geometry(ti)
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out, fixed = [], []
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for k in range(len(dists)):
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d0 = dists[k]
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fixed.append(len(out)) # Zeitpunkte alle `step` s behalten, sonst ginge das Bremsen verloren
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out.append((d0, k * step))
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if k + 1 < len(dists) and dists[k + 1] > d0:
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d1 = dists[k + 1]
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for j in range(bisect_right(cum, d0), bisect_right(cum, d1)):
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if d0 < cum[j] < d1:
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out.append((cum[j], (k + (cum[j] - d0) / (d1 - d0)) * step))
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res = [[*self.point_at((pts, cum, None), d), round(t, 2)] for d, t in out]
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return simplify(res, tolerance, fixed)
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@staticmethod
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def point_at(g, d: float):
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pts, cum, _ = g
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k = max(0, min(bisect_right(cum, d) - 1, len(pts) - 2))
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seg = cum[k + 1] - cum[k]
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t = 0.0 if seg <= 0 else (d - cum[k]) / seg
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(x1, y1), (x2, y2) = pts[k], pts[k + 1]
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return round(x1 + t * (x2 - x1), 6), round(y1 + t * (y2 - y1), 6)
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# ---------- Echtzeit ----------
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def times(self, ti: int, ds: float, upd):
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"""Ankunft/Abfahrt je Halt (Sekunden ab Betriebstag), mit Verspätungen aus GTFS-RT.
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Eine Verspätung gilt für alle folgenden Halte, bis eine neue gemeldet wird."""
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o0, o1 = self.off[ti], self.off[ti + 1]
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arr, dep = list(self.st_arr[o0:o1]), list(self.st_dep[o0:o1])
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if not upd:
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return arr, dep
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seqs, stops = self.st_seq[o0:o1], self.st_stop[o0:o1]
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by_i, j = {}, 0
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for u in upd:
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if u[0] is not None: # Schweiz, Deutschland: über die Halt-Nummer
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i = bisect_right(seqs, u[0]) - 1
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if i >= 0 and seqs[i] == u[0]:
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by_i[i] = u
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continue
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# Frankreich, Niederlande: nur Haltestellen-ID; über den Bahnhof abgleichen, damit es
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# auch bei Gleiswechsel passt, und der Reihe nach (eine Fahrt kann einen Bahnhof zweimal haben)
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k = self.stop_index.get(u[1])
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if k is None:
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continue
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for i in range(j, len(stops)):
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if self.stop_group[stops[i]] == self.stop_group[k]:
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by_i[i], j = u, i + 1
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break
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cur, prev = None, -10 ** 9
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for i in range(len(arr)):
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u = by_i.get(i)
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if u and u[2] is not None:
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a = u[2] - ds if u[3] else arr[i] + u[2]
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cur = a - arr[i]
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else:
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a = arr[i] + (cur or 0)
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if u and u[4] is not None:
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d = u[4] - ds if u[5] else dep[i] + u[4]
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cur = d - dep[i]
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else:
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d = dep[i] + (cur or 0)
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a = max(a, prev)
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d = max(d, a)
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arr[i], dep[i], prev = a, d, d
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return arr, dep
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# ---------- Positionen ----------
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def vehicles(self, now: float, rt: dict):
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feats = []
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today = dt.datetime.fromtimestamp(now, TZ).date()
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for d in (today - dt.timedelta(days=1), today):
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ds, dstr = day_start(d), d.strftime("%Y%m%d")
|
||
t = now - ds
|
||
for start, end, ti in self.trips_on(d):
|
||
if start > t + 600:
|
||
break # Liste ist nach Abfahrt sortiert
|
||
if end + 7200 < t: # grosszügig, damit verspätete Züge nicht verschwinden
|
||
continue
|
||
r = rt.get((self.trip_ids[ti], dstr))
|
||
if r and r[0]:
|
||
continue # ausgefallen
|
||
arr, dep = self.times(ti, ds, r[1] if r else None)
|
||
if not (dep[0] <= t <= arr[-1]):
|
||
continue
|
||
pa, pd = with_min_dwell(arr, dep) # nur für die Position; Zeiten/Verspätung bleiben echt
|
||
i = min(bisect_right(pd, t), len(pd) - 1) # Zug ist zwischen Halt i-1 und i (oder steht an Halt i)
|
||
g = self.geometry(ti)
|
||
sd = g[2]
|
||
o = self.off[ti]
|
||
if t >= pa[i]: # steht am Halt i
|
||
dist = sd[i]
|
||
delay = dep[i] - self.st_dep[o + i] if t >= arr[i] else arr[i] - self.st_arr[o + i]
|
||
else:
|
||
dist = sd[i - 1] + travelled(sd[i] - sd[i - 1], pa[i] - pd[i - 1], t - pd[i - 1])
|
||
delay = arr[i] - self.st_arr[o + i]
|
||
lon, lat = self.point_at(g, dist)
|
||
# Richtung aus dem Gleisverlauf (±25 m), stimmt auch im Stillstand
|
||
(x1, y1), (x2, y2) = self.point_at(g, dist - 25), self.point_at(g, dist + 25)
|
||
dx, dy = (x2 - x1) * math.cos(math.radians(lat)), y2 - y1
|
||
heading = round(math.degrees(math.atan2(dx, dy)), 1) if dx or dy else None
|
||
route = self.routes[self.trip_route[ti]]
|
||
feats.append({
|
||
"type": "Feature",
|
||
"geometry": {"type": "Point", "coordinates": [lon, lat]},
|
||
"properties": {
|
||
"id": f"{dstr}/{ti}", "line": route["line"], "cat": route["cat"], "fv": route["fv"],
|
||
"nr": self.trip_number[ti], "to": self.trip_headsign[ti],
|
||
"delay": delay if r else None, "next": self.stop_name[self.st_stop[o + i]],
|
||
"heading": heading,
|
||
},
|
||
"_ti": ti, "_dist": dist, # intern, für track(); werden vor dem Versand entfernt
|
||
})
|
||
return feats
|
||
|
||
def trip_detail(self, date: str, ti: int, now: float, rt: dict):
|
||
d = dt.datetime.strptime(date, "%Y%m%d").date()
|
||
ds = day_start(d)
|
||
r = rt.get((self.trip_ids[ti], date))
|
||
arr, dep = self.times(ti, ds, r[1] if r else None)
|
||
o0, o1 = self.off[ti], self.off[ti + 1]
|
||
|
||
def hhmm(sec):
|
||
return dt.datetime.fromtimestamp(ds + sec, TZ).strftime("%H:%M")
|
||
|
||
stops, g = [], self.geometry(ti)
|
||
for k, i in enumerate(range(o0, o1)):
|
||
s = self.st_stop[i]
|
||
stops.append({
|
||
"name": self.stop_name[s], "platform": self.stop_platform[s],
|
||
**dict(zip(("lon", "lat"), self.point_at(g, g[2][k]))), # Punkt auf der Strecke
|
||
"arr": hhmm(self.st_arr[i]) if k > 0 else None,
|
||
"dep": hhmm(self.st_dep[i]) if i < o1 - 1 else None,
|
||
"arr_delay": arr[k] - self.st_arr[i] if r else None,
|
||
"dep_delay": dep[k] - self.st_dep[i] if r else None,
|
||
"passed": now - ds > dep[k],
|
||
})
|
||
route = self.routes[self.trip_route[ti]]
|
||
return {"line": route["line"], "cat": route["cat"], "agency": route["agency"],
|
||
"nr": self.trip_number[ti], "to": self.trip_headsign[ti],
|
||
"realtime": bool(r), "canceled": bool(r and r[0]),
|
||
"stops": stops, "shape": self.geometry(ti)[0]}
|