JS Skeleton

clients/client.js

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+// Import the WebSocket library with `npm install ws`
+const WebSocket = require('ws');
+// Import the readline module to read keypresses
+const readline = require('readline');
+
+// --- Configuration ---
+// Change your ship name to your initials
+const YOUR_NAME_3 = 'YOUXX'
+const SERVER = '54.251.134.162'
+const SERVER_ADDRESS = 'ws://' + SERVER + '/0/ship/' + YOUR_NAME_3;
+
+// --- WebSocket Connection ---
+console.log(`Connecting to ${SERVER_ADDRESS}`);
+const ws = new WebSocket(SERVER_ADDRESS);
+
+// --- Event Handlers ---
+
+// Handle the connection opening
+ws.on('open', function open() {
+  console.log('Press "j" for LEFT, "k" for RIGHT, SPACE for FIRE. Press CTRL+C to exit.');
+});
+
+// Handle incoming messages from the server
+ws.on('message', function incoming(data) {
+  console.log(`Game state from server: ${data}`);
+});
+
+// Handle connection errors
+ws.on('error', function error(err) {
+  console.error('Connection Error:', err.message);
+  process.exit(1); // Exit the program on error
+});
+
+// Handle the connection closing
+ws.on('close', function close() {
+  console.log('Disconnected from the server.');
+  process.exit(0); 
+});
+
+// Set up readline to listen for single keypresses
+readline.emitKeypressEvents(process.stdin);
+if (process.stdin.isTTY) {
+    process.stdin.setRawMode(true);
+}
+
+// Radians
+// 0 - EAST
+// π/2 - SOUTH
+// π - WEST
+// 3π/2 - NORTH
+var ship_theta = 0.0;
+
+process.stdin.on('keypress', (str, key) => {
+  if (key.ctrl && key.name === 'c') {
+    ws.close();
+  }
+
+  if (ws.readyState === WebSocket.OPEN) {
+    let message = '';
+
+    if (key.name === 'j') {
+      message = '{"theta": ' + ship_theta + '}';
+    } else if (key.name === 'k') {
+      message = '{"theta": ' + ship_theta + '}';
+    } else if (key.name === 'space') {
+      message = '{"fire":true}';
+    }
+
+    if (message) {
+      console.log(`Sending: ${message}`);
+      ws.send(message);
+    }
+  } else {
+    console.log('WebSocket is not connected. Cannot send message.');
+  }
+});