Draw front lines on the react map.

https://github.com/dcs-liberation/dcs_liberation/issues/2039

game/server/app.py

@@ -6,6 +6,7 @@ from . import (
     debuggeometries,
     eventstream,
     flights,
+    frontlines,
     mapzones,
     navmesh,
     supplyroutes,
@@ -24,6 +25,7 @@ app.include_router(controlpoints.router)
 app.include_router(debuggeometries.router)
 app.include_router(eventstream.router)
 app.include_router(flights.router)
+app.include_router(frontlines.router)
 app.include_router(mapzones.router)
 app.include_router(navmesh.router)
 app.include_router(supplyroutes.router)

game/server/frontlines/__init__.py

@@ -0,0 +1 @@
+from .routes import router

game/server/frontlines/models.py

@@ -0,0 +1,9 @@
+from __future__ import annotations
+
+from pydantic import BaseModel
+
+from game.server.leaflet import LeafletPoint
+
+
+class FrontLineJs(BaseModel):
+    extents: list[LeafletPoint]

game/server/frontlines/routes.py

@@ -0,0 +1,22 @@
+from fastapi import APIRouter, Depends
+
+from game import Game
+from game.utils import nautical_miles
+from .models import FrontLineJs
+from ..dependencies import GameContext
+
+router: APIRouter = APIRouter(prefix="/front-lines")
+
+
+@router.get("/")
+def list_front_lines(game: Game = Depends(GameContext.get)) -> list[FrontLineJs]:
+    front_lines = []
+    for front_line in game.theater.conflicts():
+        a = front_line.position.point_from_heading(
+            front_line.attack_heading.right.degrees, nautical_miles(2).meters
+        )
+        b = front_line.position.point_from_heading(
+            front_line.attack_heading.left.degrees, nautical_miles(2).meters
+        )
+        front_lines.append(FrontLineJs(extents=[a.latlng(), b.latlng()]))
+    return front_lines