Add a basic React implementation of the map.

See client/README.md for instructions.

client/src/App.css

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+.App {
+  text-align: center;
+}
+
+.App-logo {
+  height: 40vmin;
+  pointer-events: none;
+}
+
+@media (prefers-reduced-motion: no-preference) {
+  .App-logo {
+    animation: App-logo-spin infinite 20s linear;
+  }
+}
+
+.App-header {
+  background-color: #282c34;
+  min-height: 100vh;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  font-size: calc(10px + 2vmin);
+  color: white;
+}
+
+.App-link {
+  color: #61dafb;
+}
+
+@keyframes App-logo-spin {
+  from {
+    transform: rotate(0deg);
+  }
+  to {
+    transform: rotate(360deg);
+  }
+}

client/src/App.test.tsx

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+import React from 'react';
+import { render, screen } from '@testing-library/react';
+import App from './App';
+
+test('renders learn react link', () => {
+  render(<App />);
+  const linkElement = screen.getByText(/learn react/i);
+  expect(linkElement).toBeInTheDocument();
+});

client/src/App.tsx

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+import { LatLng } from "leaflet";
+import "./App.css";
+
+import { LiberationMap } from "./map/liberationmap/LiberationMap";
+import { ControlPoint } from "./game/controlpoint";
+import { useEffect } from "react";
+import { useAppDispatch } from "./app/hooks";
+import { setControlPoints } from "./game/theater/theaterSlice";
+import axios from "axios";
+
+function App() {
+  const mapCenter: LatLng = new LatLng(25.58, 54.9);
+
+  const dispatch = useAppDispatch();
+
+  useEffect(() => {
+    axios
+      .get("http://[::1]:5000/control-points")
+      .catch((error) => console.log(`Error fetching control points: ${error}`))
+      .then((response) => {
+        if (response != null) {
+          dispatch(setControlPoints(response.data as ControlPoint[]));
+        }
+      });
+  });
+
+  console.log(`mapCenter=${mapCenter}`);
+  return (
+    <div className="App">
+      <LiberationMap mapCenter={mapCenter} />
+    </div>
+  );
+}
+
+export default App;

client/src/app/hooks.ts

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+import { TypedUseSelectorHook, useDispatch, useSelector } from "react-redux";
+import type { RootState, AppDispatch } from "./store";
+
+// Use throughout your app instead of plain `useDispatch` and `useSelector`
+export const useAppDispatch = () => useDispatch<AppDispatch>();
+export const useAppSelector: TypedUseSelectorHook<RootState> = useSelector;

client/src/app/store.ts

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+import { configureStore, ThunkAction, Action } from "@reduxjs/toolkit";
+import theaterReducer from "../game/theater/theaterSlice";
+
+export const store = configureStore({
+  reducer: {
+    theater: theaterReducer,
+  },
+});
+
+export type AppDispatch = typeof store.dispatch;
+export type RootState = ReturnType<typeof store.getState>;
+export type AppThunk<ReturnType = void> = ThunkAction<
+  ReturnType,
+  RootState,
+  unknown,
+  Action<string>
+>;

client/src/game/controlpoint.ts

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+import { LatLng } from "leaflet";
+
+export interface ControlPoint {
+  id: number;
+  name: string;
+  blue: boolean;
+  position: LatLng;
+  mobile: boolean;
+  destination: LatLng | null;
+  sidc: string;
+}

client/src/game/theater/theaterSlice.ts

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+import { createSlice, PayloadAction } from "@reduxjs/toolkit";
+import { RootState } from "../../app/store";
+import { ControlPoint } from "../controlpoint";
+
+interface TheaterState {
+  controlPoints: ControlPoint[];
+}
+
+const initialState: TheaterState = {
+  controlPoints: [],
+};
+
+export const theaterSlice = createSlice({
+  name: "theater",
+  initialState,
+  reducers: {
+    setControlPoints: (state, action: PayloadAction<ControlPoint[]>) => {
+      state.controlPoints = action.payload;
+    },
+  },
+});
+
+export const { setControlPoints } = theaterSlice.actions;
+
+export const selectControlPoints = (state: RootState) =>
+  state.theater.controlPoints;
+
+export default theaterSlice.reducer;

client/src/index.css

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+body {
+  margin: 0;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
+    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
+    sans-serif;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+code {
+  font-family: source-code-pro, Menlo, Monaco, Consolas, 'Courier New',
+    monospace;
+}

client/src/index.tsx

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+import React from "react";
+import ReactDOM from "react-dom";
+import "./index.css";
+import App from "./App";
+import { store } from "./app/store";
+import * as serviceWorker from "./serviceWorker";
+import { Provider } from "react-redux";
+
+ReactDOM.render(
+  <React.StrictMode>
+    <Provider store={store}>
+      <App />
+    </Provider>
+  </React.StrictMode>,
+  document.getElementById("root")
+);
+
+// If you want your app to work offline and load faster, you can change
+// unregister() to register() below. Note this comes with some pitfalls.
+// Learn more about service workers: https://bit.ly/CRA-PWA
+serviceWorker.unregister();

client/src/logo.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><g fill="#764ABC"><path d="M65.6 65.4c2.9-.3 5.1-2.8 5-5.8-.1-3-2.6-5.4-5.6-5.4h-.2c-3.1.1-5.5 2.7-5.4 5.8.1 1.5.7 2.8 1.6 3.7-3.4 6.7-8.6 11.6-16.4 15.7-5.3 2.8-10.8 3.8-16.3 3.1-4.5-.6-8-2.6-10.2-5.9-3.2-4.9-3.5-10.2-.8-15.5 1.9-3.8 4.9-6.6 6.8-8-.4-1.3-1-3.5-1.3-5.1-14.5 10.5-13 24.7-8.6 31.4 3.3 5 10 8.1 17.4 8.1 2 0 4-.2 6-.7 12.8-2.5 22.5-10.1 28-21.4z"/><path d="M83.2 53c-7.6-8.9-18.8-13.8-31.6-13.8H50c-.9-1.8-2.8-3-4.9-3h-.2c-3.1.1-5.5 2.7-5.4 5.8.1 3 2.6 5.4 5.6 5.4h.2c2.2-.1 4.1-1.5 4.9-3.4H52c7.6 0 14.8 2.2 21.3 6.5 5 3.3 8.6 7.6 10.6 12.8 1.7 4.2 1.6 8.3-.2 11.8-2.8 5.3-7.5 8.2-13.7 8.2-4 0-7.8-1.2-9.8-2.1-1.1 1-3.1 2.6-4.5 3.6 4.3 2 8.7 3.1 12.9 3.1 9.6 0 16.7-5.3 19.4-10.6 2.9-5.8 2.7-15.8-4.8-24.3z"/><path d="M32.4 67.1c.1 3 2.6 5.4 5.6 5.4h.2c3.1-.1 5.5-2.7 5.4-5.8-.1-3-2.6-5.4-5.6-5.4h-.2c-.2 0-.5 0-.7.1-4.1-6.8-5.8-14.2-5.2-22.2.4-6 2.4-11.2 5.9-15.5 2.9-3.7 8.5-5.5 12.3-5.6 10.6-.2 15.1 13 15.4 18.3 1.3.3 3.5 1 5 1.5-1.2-16.2-11.2-24.6-20.8-24.6-9 0-17.3 6.5-20.6 16.1-4.6 12.8-1.6 25.1 4 34.8-.5.7-.8 1.8-.7 2.9z"/></g></svg>

client/src/map/controlpoint/ControlPoint.tsx

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+import { Icon, Point } from "leaflet";
+import { Marker, Popup } from "react-leaflet";
+import { ControlPoint as ControlPointModel } from "../../game/controlpoint";
+import { Symbol as MilSymbol } from "milsymbol";
+
+function iconForControlPoint(cp: ControlPointModel) {
+  const symbol = new MilSymbol(cp.sidc, {
+    size: 24,
+    colorMode: "Dark",
+  });
+
+  return new Icon({
+    iconUrl: symbol.toDataURL(),
+    iconAnchor: new Point(symbol.getAnchor().x, symbol.getAnchor().y),
+  });
+}
+
+interface ControlPointProps {
+  controlPoint: ControlPointModel;
+}
+
+export function ControlPoint(props: ControlPointProps) {
+  return (
+    <Marker
+      position={props.controlPoint.position}
+      icon={iconForControlPoint(props.controlPoint)}
+    >
+      <Popup>{props.controlPoint.name}</Popup>
+    </Marker>
+  );
+}

client/src/map/controlpointslayer/ControlPointsLayer.tsx

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+import { LayerGroup } from "react-leaflet";
+import { useAppSelector } from "../../app/hooks";
+import { selectControlPoints } from "../../game/theater/theaterSlice";
+import { ControlPoint } from "../controlpoint/ControlPoint";
+
+export function ControlPointsLayer() {
+  const controlPoints = useAppSelector(selectControlPoints);
+  console.log(`controlPoints is ${controlPoints}`);
+  return (
+    <LayerGroup>
+      {controlPoints.map((controlPoint) => {
+        return (
+          <ControlPoint key={controlPoint.name} controlPoint={controlPoint} />
+        );
+      })}
+    </LayerGroup>
+  );
+}

client/src/map/liberationmap/LiberationMap.css

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+@import "~leaflet/dist/leaflet.css";
+
+.leaflet-container {
+  width: 100%;
+  height: 100%;
+  min-height: 100vh;
+}

client/src/map/liberationmap/LiberationMap.tsx

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+import { MapContainer } from "react-leaflet";
+import { BasemapLayer } from "react-esri-leaflet";
+import { ControlPointsLayer } from "../controlpointslayer/ControlPointsLayer";
+import "./LiberationMap.css";
+import { LatLng } from "leaflet";
+
+interface GameProps {
+  mapCenter: LatLng;
+}
+
+export function LiberationMap(props: GameProps) {
+  return (
+    <MapContainer zoom={8} center={props.mapCenter}>
+      <BasemapLayer name="ImageryClarity" />
+      <ControlPointsLayer />
+    </MapContainer>
+  );
+}

client/src/react-app-env.d.ts

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+/// <reference types="react-scripts" />

client/src/serviceWorker.ts

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+// This optional code is used to register a service worker.
+// register() is not called by default.
+
+// This lets the app load faster on subsequent visits in production, and gives
+// it offline capabilities. However, it also means that developers (and users)
+// will only see deployed updates on subsequent visits to a page, after all the
+// existing tabs open on the page have been closed, since previously cached
+// resources are updated in the background.
+
+// To learn more about the benefits of this model and instructions on how to
+// opt-in, read https://bit.ly/CRA-PWA
+
+const isLocalhost = Boolean(
+  window.location.hostname === 'localhost' ||
+    // [::1] is the IPv6 localhost address.
+    window.location.hostname === '[::1]' ||
+    // 127.0.0.0/8 are considered localhost for IPv4.
+    window.location.hostname.match(
+      /^127(?:\.(?:25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)){3}$/
+    )
+);
+
+type Config = {
+  onSuccess?: (registration: ServiceWorkerRegistration) => void;
+  onUpdate?: (registration: ServiceWorkerRegistration) => void;
+};
+
+export function register(config?: Config) {
+  if (process.env.NODE_ENV === 'production' && 'serviceWorker' in navigator) {
+    // The URL constructor is available in all browsers that support SW.
+    const publicUrl = new URL(process.env.PUBLIC_URL, window.location.href);
+    if (publicUrl.origin !== window.location.origin) {
+      // Our service worker won't work if PUBLIC_URL is on a different origin
+      // from what our page is served on. This might happen if a CDN is used to
+      // serve assets; see https://github.com/facebook/create-react-app/issues/2374
+      return;
+    }
+
+    window.addEventListener('load', () => {
+      const swUrl = `${process.env.PUBLIC_URL}/service-worker.js`;
+
+      if (isLocalhost) {
+        // This is running on localhost. Let's check if a service worker still exists or not.
+        checkValidServiceWorker(swUrl, config);
+
+        // Add some additional logging to localhost, pointing developers to the
+        // service worker/PWA documentation.
+        navigator.serviceWorker.ready.then(() => {
+          console.log(
+            'This web app is being served cache-first by a service ' +
+              'worker. To learn more, visit https://bit.ly/CRA-PWA'
+          );
+        });
+      } else {
+        // Is not localhost. Just register service worker
+        registerValidSW(swUrl, config);
+      }
+    });
+  }
+}
+
+function registerValidSW(swUrl: string, config?: Config) {
+  navigator.serviceWorker
+    .register(swUrl)
+    .then((registration) => {
+      registration.onupdatefound = () => {
+        const installingWorker = registration.installing;
+        if (installingWorker == null) {
+          return;
+        }
+        installingWorker.onstatechange = () => {
+          if (installingWorker.state === 'installed') {
+            if (navigator.serviceWorker.controller) {
+              // At this point, the updated precached content has been fetched,
+              // but the previous service worker will still serve the older
+              // content until all client tabs are closed.
+              console.log(
+                'New content is available and will be used when all ' +
+                  'tabs for this page are closed. See https://bit.ly/CRA-PWA.'
+              );
+
+              // Execute callback
+              if (config && config.onUpdate) {
+                config.onUpdate(registration);
+              }
+            } else {
+              // At this point, everything has been precached.
+              // It's the perfect time to display a
+              // "Content is cached for offline use." message.
+              console.log('Content is cached for offline use.');
+
+              // Execute callback
+              if (config && config.onSuccess) {
+                config.onSuccess(registration);
+              }
+            }
+          }
+        };
+      };
+    })
+    .catch((error) => {
+      console.error('Error during service worker registration:', error);
+    });
+}
+
+function checkValidServiceWorker(swUrl: string, config?: Config) {
+  // Check if the service worker can be found. If it can't reload the page.
+  fetch(swUrl, {
+    headers: { 'Service-Worker': 'script' },
+  })
+    .then((response) => {
+      // Ensure service worker exists, and that we really are getting a JS file.
+      const contentType = response.headers.get('content-type');
+      if (
+        response.status === 404 ||
+        (contentType != null && contentType.indexOf('javascript') === -1)
+      ) {
+        // No service worker found. Probably a different app. Reload the page.
+        navigator.serviceWorker.ready.then((registration) => {
+          registration.unregister().then(() => {
+            window.location.reload();
+          });
+        });
+      } else {
+        // Service worker found. Proceed as normal.
+        registerValidSW(swUrl, config);
+      }
+    })
+    .catch(() => {
+      console.log(
+        'No internet connection found. App is running in offline mode.'
+      );
+    });
+}
+
+export function unregister() {
+  if ('serviceWorker' in navigator) {
+    navigator.serviceWorker.ready
+      .then((registration) => {
+        registration.unregister();
+      })
+      .catch((error) => {
+        console.error(error.message);
+      });
+  }
+}

client/src/setupTests.ts

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+// jest-dom adds custom jest matchers for asserting on DOM nodes.
+// allows you to do things like:
+// expect(element).toHaveTextContent(/react/i)
+// learn more: https://github.com/testing-library/jest-dom
+import '@testing-library/jest-dom/extend-expect';