Show lines connecting transport stops on map

Closes: #104

templates/trip_page.html

@@ -93,6 +93,7 @@
 
 <script>
 var coordinates = {{ coordinates | tojson }};
+var routes = {{ routes | tojson }};
 
 // Initialize the map
 var map = L.map('map').fitBounds(coordinates.map(function(station) {
@@ -123,6 +124,11 @@ coordinates.forEach(function(item) {
   marker.bindPopup(item.name);
 });
 
+// Draw lines for routes
+routes.forEach(function(route) {
+  L.polyline(route, {color: 'blue'}).addTo(map);
+});
+
 </script>
 {% endif %}
 {% endblock %}

web_view.py

@@ -296,6 +296,31 @@ def collect_trip_coordinates(trip: Trip) -> list[StrDict]:
     ]
 
 
+def latlon_tuple(stop: StrDict) -> tuple[float, float]:
+    """Given a transport stop return the lat/lon as a tuple."""
+    return (stop["latitude"], stop["longitude"])
+
+
+def get_trip_routes(
+    trip: Trip,
+) -> list[tuple[tuple[float, float], tuple[float, float]]]:
+    routes = []
+    for t in trip.travel:
+        if t["type"] == "flight":
+            if "from_airport" not in t or "to_airport" not in t:
+                continue
+            fly_from, fly_to = t["from_airport"], t["to_airport"]
+            routes.append((latlon_tuple(fly_from), latlon_tuple(fly_to)))
+
+        else:
+            assert t["type"] == "train"
+            for leg in t["legs"]:
+                train_from, train_to = leg["from_station"], leg["to_station"]
+                routes.append((latlon_tuple(train_from), latlon_tuple(train_to)))
+
+    return routes
+
+
 @app.route("/trip/<start>")
 def trip_page(start: str) -> str:
     """Individual trip page."""
@@ -308,12 +333,14 @@ def trip_page(start: str) -> str:
         flask.abort(404)
 
     coordinates = collect_trip_coordinates(trip)
+    routes = get_trip_routes(trip)
 
     return flask.render_template(
         "trip_page.html",
         trip=trip,
         today=today,
         coordinates=coordinates,
+        routes=routes,
         get_country=agenda.get_country,
         format_list_with_ampersand=format_list_with_ampersand,
     )