Draw frozen combat in the new UI.

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

client/src/api/combat.ts

@@ -0,0 +1,8 @@
+import { LatLng } from "leaflet";
+
+export default interface Combat {
+  id: string;
+  flight_position: LatLng | null;
+  target_positions: LatLng[] | null;
+  footprint: LatLng[][] | null;
+}

client/src/api/combatSlice.ts

@@ -0,0 +1,42 @@
+import { RootState } from "../app/store";
+import Combat from "./combat";
+import { PayloadAction, createSlice } from "@reduxjs/toolkit";
+
+interface CombatState {
+  combat: { [key: string]: Combat };
+}
+
+const initialState: CombatState = {
+  combat: {},
+};
+
+export const combatSlice = createSlice({
+  name: "combat",
+  initialState,
+  reducers: {
+    setCombat: (state, action: PayloadAction<Combat[]>) => {
+      state.combat = {};
+      for (const combat of action.payload) {
+        state.combat[combat.id] = combat;
+      }
+    },
+    newCombat: (state, action: PayloadAction<Combat>) => {
+      const combat = action.payload;
+      state.combat[combat.id] = combat;
+    },
+    updateCombat: (state, action: PayloadAction<Combat>) => {
+      const combat = action.payload;
+      state.combat[combat.id] = combat;
+    },
+    endCombat: (state, action: PayloadAction<string>) => {
+      delete state.combat[action.payload];
+    },
+  },
+});
+
+export const { setCombat, newCombat, updateCombat, endCombat } =
+  combatSlice.actions;
+
+export const selectCombat = (state: RootState) => state.combat;
+
+export default combatSlice.reducer;

client/src/api/eventstream.tsx

@@ -1,5 +1,7 @@
 import { AppDispatch } from "../app/store";
 import backend from "./backend";
+import Combat from "./combat";
+import { endCombat, newCombat, updateCombat } from "./combatSlice";
 import { updateControlPoint } from "./controlPointsSlice";
 import { ControlPoint } from "./controlpoint";
 import { Flight } from "./flight";
@@ -21,14 +23,10 @@ import Tgo from "./tgo";
 import { updateTgo } from "./tgosSlice";
 import { LatLng } from "leaflet";
 
-// Placeholder. We don't use this yet. This is just here so we can flesh out the
-// update events model.
-interface FrozenCombat {}
-
 interface GameUpdateEvents {
   updated_flight_positions: { [id: string]: LatLng };
-  new_combats: FrozenCombat[];
-  updated_combats: FrozenCombat[];
+  new_combats: Combat[];
+  updated_combats: Combat[];
   ended_combats: string[];
   navmesh_updates: boolean[];
   unculled_zones_updated: boolean;
@@ -55,6 +53,18 @@ export const handleStreamedEvents = (
     dispatch(updateFlightPosition([id, position]));
   }
 
+  for (const combat of events.new_combats) {
+    dispatch(newCombat(combat));
+  }
+
+  for (const combat of events.updated_combats) {
+    dispatch(updateCombat(combat));
+  }
+
+  for (const id of events.ended_combats) {
+    dispatch(endCombat(id));
+  }
+
   for (const flight of events.new_flights) {
     dispatch(registerFlight(flight));
   }

client/src/app/store.ts

@@ -1,3 +1,4 @@
+import combatReducer from "../api/combatSlice";
 import controlPointsReducer from "../api/controlPointsSlice";
 import flightsReducer from "../api/flightsSlice";
 import frontLinesReducer from "../api/frontLinesSlice";
@@ -8,14 +9,15 @@ import logger from "redux-logger";
 
 export const store = configureStore({
   reducer: {
+    combat: combatReducer,
+    controlPoints: controlPointsReducer,
     flights: flightsReducer,
     frontLines: frontLinesReducer,
-    controlPoints: controlPointsReducer,
     supplyRoutes: supplyRoutesReducer,
     tgos: tgosReducer,
   },
   // The logger middleware must be last or it won't log actions.
-  //middleware: [logger],
+  middleware: [logger],
 });
 
 export type AppDispatch = typeof store.dispatch;

client/src/components/combat/Combat.tsx

@@ -0,0 +1,52 @@
+import CombatModel from "../../api/combat";
+import { LatLng } from "leaflet";
+import { Polygon, Polyline } from "react-leaflet";
+
+interface CombatProps {
+  combat: CombatModel;
+}
+
+function CombatFootprint(props: CombatProps) {
+  if (!props.combat.footprint) {
+    return <></>;
+  }
+
+  return (
+    <Polygon
+      positions={props.combat.footprint}
+      color="#c85050"
+      interactive={false}
+      fillOpacity={0.2}
+    />
+  );
+}
+
+function CombatLines(props: CombatProps) {
+  if (!props.combat.flight_position || !props.combat.target_positions) {
+    return <></>;
+  }
+
+  const flightPosition: LatLng = props.combat.flight_position;
+  return (
+    <>
+      {props.combat.target_positions.map((position) => {
+        return (
+          <Polyline
+            positions={[flightPosition, position]}
+            color="#c85050"
+            interactive={false}
+          />
+        );
+      })}
+    </>
+  );
+}
+
+export default function Combat(props: CombatProps) {
+  return (
+    <>
+      <CombatFootprint {...props} />
+      <CombatLines {...props} />
+    </>
+  );
+}

client/src/components/combat/index.ts

@@ -0,0 +1 @@
+export { default } from "./Combat";

client/src/components/combatlayer/CombatLayer.tsx

@@ -0,0 +1,16 @@
+import { selectCombat } from "../../api/combatSlice";
+import { useAppSelector } from "../../app/hooks";
+import Combat from "../combat/Combat";
+import { LayerGroup } from "react-leaflet";
+
+export default function CombatLayer() {
+  const combats = useAppSelector(selectCombat);
+  return (
+    <LayerGroup>
+      {Object.values(combats.combat).map((combat) => {
+        return <Combat key={combat.id} combat={combat} />;
+      })}
+      (
+    </LayerGroup>
+  );
+}

client/src/components/combatlayer/index.ts

@@ -0,0 +1 @@
+export { default } from "./CombatLayer";

client/src/components/liberationmap/LiberationMap.tsx

@@ -1,5 +1,6 @@
 import AircraftLayer from "../aircraftlayer";
 import AirDefenseRangeLayer from "../airdefenserangelayer";
+import CombatLayer from "../combatlayer";
 import ControlPointsLayer from "../controlpointslayer";
 import FlightPlansLayer from "../flightplanslayer";
 import FrontLinesLayer from "../frontlineslayer";
@@ -34,6 +35,9 @@ export default function LiberationMap(props: GameProps) {
         <LayersControl.Overlay name="Aircraft" checked>
           <AircraftLayer />
         </LayersControl.Overlay>
+        <LayersControl.Overlay name="Active combat" checked>
+          <CombatLayer />
+        </LayersControl.Overlay>
         <LayersControl.Overlay name="Air defenses" checked>
           <TgosLayer categories={["aa"]} />
         </LayersControl.Overlay>