Begin working on the client, and fix a ton of bugs in the server deserialisation process.

Nibriboard/Client/Messages/ClientStateMessage.cs

@@ -0,0 +1,20 @@
+using System;
+using System.Collections.Generic;
+
+using RippleSpace;
+
+namespace Nibriboard.Client.Messages
+{
+	/// <summary>
+	/// Represents an update of where a group of connected clients are.
+	/// </summary>
+	public class ClientStateMessage : Message
+	{
+		public List<ClientState> ClientStates = new List<ClientState>();
+
+		public ClientStateMessage()
+		{
+		}
+	}
+}
+

Nibriboard/Client/Messages/CursorPositionMessage.cs

@@ -0,0 +1,21 @@
+using System;
+using System.Drawing;
+
+namespace Nibriboard.Client.Messages
+{
+	/// <summary>
+	/// Represents an update by the client of their cursor position.
+	/// </summary>
+	public class CursorPositionMessage
+	{
+		/// <summary>
+		/// The absolute cursor position.
+		/// </summary>
+		public Point AbsCursorPosition;
+
+		public CursorPositionMessage()
+		{
+		}
+	}
+}
+

Nibriboard/Client/Messages/HandshakeRequestMessage.cs

@@ -1,6 +1,10 @@
 using System;
 using System.Drawing;
 
+using Newtonsoft.Json;
+// TODO: In C# you can either have namespaces or types in a namespace - not both.
+using Nibriboard.Utilities.JsonConverters;
+
 namespace Nibriboard.Client.Messages
 {
 	public class HandshakeRequestMessage : Message
@@ -9,10 +13,12 @@ namespace Nibriboard.Client.Messages
 		/// The initial visible area on the client's screen.
 		/// Very useful for determining which chunks we should send a client when they first connect.
 		/// </summary>
+		[JsonConverter(typeof(RectangleConverter))]
 		public Rectangle InitialViewport = Rectangle.Empty;
 		/// <summary>
 		/// The initial position of the user's cursor.
 		/// </summary>
+		[JsonConverter(typeof(RectangleConverter))]
 		public Point InitialAbsCursorPosition = Point.Empty;
 
 		public HandshakeRequestMessage()

Nibriboard/Client/NibriClient.cs

@@ -3,6 +3,7 @@ using System.Threading.Tasks;
 using System.Text;
 using System.Collections.Generic;
 using System.Drawing;
+using System.Linq;
 
 using IotWeb.Common.Http;
 using SBRL.Utilities;
@@ -88,12 +89,19 @@ namespace Nibriboard.Client
 		{
 			string eventName = JsonUtilities.DeserializeProperty<string>(frame, "event");
 
-			if (!messageEventTypes.ContainsKey(eventName))
-				Log.WriteLine("Received message with invalid event {1} from Client #{0}", Id, eventName);
+			if(eventName == null) {
+				Log.WriteLine("[NibriClient#{0}] Received message that didn't have an event.", Id);
+				return;
+			}
+
+			if (!messageEventTypes.ContainsKey(eventName)) {
+				Log.WriteLine("[NibriClient#{0}] Received message with invalid event {1}.", Id, eventName);
+				return;
+			}
 
 			Type messageType = messageEventTypes[eventName];
 			Type jsonNet = typeof(JsonConvert);
-			MethodInfo deserialiserInfo = jsonNet.GetMethod("DeserailizeObject");
+			MethodInfo deserialiserInfo = jsonNet.GetMethods().First(method => method.Name == "DeserializeObject" && method.IsGenericMethod);
 			MethodInfo genericInfo = deserialiserInfo.MakeGenericMethod(messageType);
 			var decodedMessage = genericInfo.Invoke(null, new object[] { frame });
 
@@ -147,6 +155,7 @@ namespace Nibriboard.Client
 			CurrentViewPort = message.InitialViewport;
 			AbsoluteCursorPosition = message.InitialAbsCursorPosition;
 
+			// Tell everyone else about the new client
 			Send(GenerateClientStateUpdate());
 
 			return Task.CompletedTask;
@@ -158,6 +167,11 @@ namespace Nibriboard.Client
 		protected Task handleCursorPositionMessage(CursorPositionMessage message) {
 			AbsoluteCursorPosition = message.AbsCursorPosition;
 
+			// Send the update to the other clients
+			ClientStateMessage updateMessage = new ClientStateMessage();
+			updateMessage.ClientStates.Add(this.GenerateStateSnapshot());
+			manager.Broadcast(this, updateMessage);
+
 			return Task.CompletedTask;
 		}
 		#endregion

Nibriboard/Client/NibriClientManager.cs

@@ -3,6 +3,7 @@ using IotWeb.Common.Http;
 using System.Threading.Tasks;
 using System.Collections.Generic;
 using System.Diagnostics;
+using Nibriboard.Client.Messages;
 
 namespace Nibriboard.Client
 {
@@ -51,7 +52,8 @@ namespace Nibriboard.Client
 			Clients.Add(client);
 		}
 
-		public void Broadcast(NibriClient sendingClient, string message)
+
+		public void Broadcast(NibriClient sendingClient, Message message)
 		{
 			foreach(NibriClient client in Clients)
 			{
@@ -59,7 +61,7 @@ namespace Nibriboard.Client
 				if (client == sendingClient)
 					continue;
 				
-				client.SendRaw(message);
+				client.Send(message);
 			}
 		}
 	}

Nibriboard/ClientFiles/BoardWindow.js

@@ -3,6 +3,7 @@
 // npm modules
 window.EventEmitter = require("event-emitter-es6");
 window.FaviconNotification = require("favicon-notification");
+window.panzoom = require("pan-zoom");
 
 // Our files
 import RippleLink from './RippleLink';
@@ -14,18 +15,31 @@ class BoardWindow extends EventEmitter
 	{
 		super(); // Run the parent constructor
 		
+		// The maximum target fps.
 		this.maxFps = 60;
+		// Setup the fps indicator in the corner
 		this.renderTimeIndicator = document.createElement("span");
 		this.renderTimeIndicator.innerHTML = "0ms";
 		document.querySelector(".fps").appendChild(this.renderTimeIndicator);
 		
+		// Setup the canvas
 		this.canvas = canvas;
 		this.context = canvas.getContext("2d");
+		
+		// --~~~--
+		
+		// Setup the favicon thingy
+		
 		FaviconNotification.init({
 			color: '#ff6333'
 		});
 		FaviconNotification.add();
 		
+		// Setup the input controls
+		window.panzoom(canvas, this.handleCanvasMovement.bind(this));
+		
+		// Fetch the RippleLink connection information and other settings from
+		// the server
 		get("/Settings.json").then(JSON.parse).then((function(settings) {
 			console.info("[setup]", "Obtained settings from server:", settings);
 			this.settings = settings;
@@ -34,13 +48,39 @@ class BoardWindow extends EventEmitter
 			console.error(`Error: Failed to fetch settings from server! Response: ${errorMessage}`);
 		});
 		
+		// Make the canvas track the window size
 		this.trackWindowSize();
+		// Track the mouse position
+		this.trackMousePosition();
 	}
 	
+	/**
+	 * Setup ready for user input.
+	 * This mainly consists of establishing the RippleLink connection to the server.
+	 */
 	setup() {
 		this.rippleLink = new RippleLink(this.settings.WebsocketUri, this);
+		this.rippleLink.on("connect", (function(event) {
+			// Send the handshake request
+			this.rippleLink.send({
+				event: "handshakeRequest",
+				InitialViewport: { // TODO: Add support for persisting this between sessions
+					X: 0,
+					Y: 0,
+					Width: window.innerWidth,
+					Height: window.innerHeight
+				},
+				InitialAbsCursorPosition: this.cursorPosition
+			});
+		}).bind(this));
+		
+		// RippleLink message bindings
+		
 	}
 	
+	/**
+	 * Renders the next frame.
+	 */
 	nextFrame()
 	{
 		// The time at which the current frame started rendering.
@@ -63,11 +103,17 @@ class BoardWindow extends EventEmitter
 		requestAnimationFrame(this.nextFrame.bind(this));
 	}
 	
+	/**
+	 * Updates everything ready for the next frame to be rendered.
+	 */
 	update()
 	{
 		
 	}
 	
+	/**
+	 * Renders the next frame.
+	 */
 	render(canvas, context)
 	{
 		context.clearRect(0, 0, canvas.width, canvas.height);
@@ -93,6 +139,23 @@ class BoardWindow extends EventEmitter
 		this.matchWindowSize();
 		window.addEventListener("resize", this.matchWindowSize.bind(this));
 	}
+	
+	trackMousePosition() {
+		document.addEventListener("mousemove", (function(event) {
+			this.cursorPosition = {
+				X: event.clientX,
+				Y: event.clientY
+			};
+		}).bind(this));
+	}
+	
+	/**
+	 * Handles events generated by pan-zoom, the package that handles the
+	 * dragging and zooming of the whiteboard.
+	 */
+	handleCanvasMovement(event) {
+		this.viewportState = event; // Store the viewport information for later
+	}
 }
 
 export default BoardWindow;

Nibriboard/ClientFiles/RippleLink.js

@@ -1,15 +1,59 @@
 "use strict";
 
+import WebSocketStates from './Utilities/WebsocketStates';
 
-class RippleLink
+const EventEmitter = require("event-emitter-es6");
+
+class RippleLink extends EventEmitter
 {
 	constructor(inSocketUrl, inBoardWindow)
 	{
+		super();
+		
 		this.socketUrl = inSocketUrl;
 		this.boardWindow = inBoardWindow;
 		this.settings = this.boardWindow.settings;
 		
-		this.websocket = new WebSocket( this.socketUrl, [ this.settings.WebsocketProtocol ] );
+		// Create the websocket and commect to the server
+		this.websocket = new WebSocket(this.socketUrl, [ this.settings.WebsocketProtocol ]);
+		this.websocket.addEventListener("open", this.handleConnection.bind(this));
+		this.websocket.addEventListener("message", this.handleMessage.bind(this));
+		this.websocket.addEventListener("close", this.handleDisconnection.bind(this));
+		
+	}
+	
+	handleConnection(event) {
+		console.info("[ripple link] Established connection successfully.");
+		// Tell everyone about it
+		this.emit("connect", event);
+	}
+	
+	handleDisconnection(event) {
+		console.error("[ripple link] Lost connection.");
+		this.emit("disconnect", event);
+	}
+	
+	handleMessage(event) {
+		// Decode the message form the server
+		var message = JSON.parse(event.data);
+		console.debug(message);
+		
+		// Pass it on to the board manager by triggering the appropriate event
+		this.emit(message.event, message);
+	}
+	
+	/**
+	 * Sends a message object to the server.
+	 */
+	send(message) {
+		if(this.websocket.readyState !== WebSocketStates.ready)
+		{
+			console.error(`Attempt to send data on the RippleLine when it is not ready (state ${this.websocket.readyState})`);
+			return false;
+		}
+		
+		this.websocket.send(JSON.stringify(message));
+		return true;
 	}
 }
 

Nibriboard/ClientFiles/Utilities/WebsocketStates.js

@@ -0,0 +1,30 @@
+"use strict";
+
+/**
+ * Constants for the different readyStates that a WebSocket can be in.
+ * @type {Object}
+ */
+const WebSocketStates = {
+	/**
+	 * Indicates that the WebSocket is connecting to the remote server.
+	 * @type {Number}
+	 */
+	connecting: 0,
+	/**
+	 * Indicates that the WebSocket is connected to the remote server and ready to send / receive data.
+	 * @type {Number}
+	 */
+	ready: 1,
+	/**
+	 * Indicates that the WebSocket is in the process of closing the connection to the remote server.
+	 * @type {Number}
+	 */
+	closing: 2,
+	/**
+	 * Indicates that hte WebSocket is not connected to the remote server (either because the connection was closed, or dropped by the remote server).
+	 * @type {Number}
+	 */
+	closed: 3
+};
+
+export default WebSocketStates;

Nibriboard/ClientFiles/package.json

@@ -5,9 +5,9 @@
   "homepage": "https://git.starbeamrainbowlabs.com/sbrl/Nibriboard#nibriboard",
   "main": "index.js",
   "dependencies": {
+    "pan-zoom": "^2.0.0",
     "rollupify": "^0.3.8"
   },
-  
   "devDependencies": {
     "rollupify": "^0.3.8"
   },

Nibriboard/Nibriboard.csproj

@@ -77,6 +77,8 @@
     <Compile Include="Client\Messages\CursorPositionMessage.cs" />
     <Compile Include="Client\Messages\ClientStateMessage.cs" />
     <Compile Include="RippleSpace\ClientState.cs" />
+    <Compile Include="Utilities\JsonConverters\RectangleConverter.cs" />
+    <Compile Include="Utilities\JsonConverters\PointConverter.cs" />
   </ItemGroup>
   <ItemGroup>
     <EmbeddedResource Include="ClientFiles\index.html" />
@@ -90,6 +92,7 @@
     <Folder Include="ClientFiles\" />
     <Folder Include="Client\" />
     <Folder Include="Client\Messages\" />
+    <Folder Include="Utilities\JsonConverters\" />
   </ItemGroup>
   <ItemGroup>
     <None Include="packages.config" />

Nibriboard/RippleSpace/ClientState.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Drawing;
+
+namespace RippleSpace
+{
+	/// <summary>
+	/// Represents a client's state at a particular point in time.
+	/// </summary>
+	public class ClientState
+	{
+		/// <summary>
+		/// The id of the client.
+		/// </summary>
+		public int Id;
+
+		/// <summary>
+		/// The date and time at which this client state snapshot was captured.
+		/// </summary>
+		public DateTime TimeCaptured = DateTime.Now;
+
+		/// <summary>
+		/// The name the client chose to identify themselves with.
+		/// </summary>
+		public string Name;
+
+		/// <summary>
+		/// The size and position of the client's viewport.
+		/// </summary>
+		public Rectangle Viewport = Rectangle.Empty;
+		/// <summary>
+		/// The absolute position of the client's cursor.
+		/// </summary>
+		public Point AbsCursorPosition = Point.Empty;
+
+		public ClientState()
+		{
+		}
+	}
+}
+

Nibriboard/Utilities/JsonConverters/PointConverter.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Drawing;
+
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace Nibriboard.Utilities.JsonConverters
+{
+	/// <summary>
+	/// Deserialises objects into points from the System.Drawing namespace.
+	/// </summary>
+	public class PointConverter : JsonConverter
+	{
+		public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+		{
+			throw new NotImplementedException();
+		}
+
+		public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+		{
+			JObject jsonObject = JObject.Load(reader);
+
+			return new Point(
+				jsonObject.Value<int>("X"),
+				jsonObject.Value<int>("Y")
+			);
+		}
+
+		public override bool CanConvert(Type objectType)
+		{
+			if (objectType != typeof(Rectangle))
+				return false;
+			return true;
+		}
+	}
+}
+

Nibriboard/Utilities/JsonConverters/RectangleConverter.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Drawing;
+
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace Nibriboard.Utilities.JsonConverters
+{
+	/// <summary>
+	/// Deserialises objects into rectangles from the System.Drawing namespace.
+	/// </summary>
+	public class RectangleConverter : JsonConverter
+	{
+		public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+		{
+			throw new NotImplementedException();
+		}
+
+		public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+		{
+			JObject jsonObject = JObject.Load(reader);
+
+			return new Rectangle(
+				jsonObject.Value<int>("X"),
+				jsonObject.Value<int>("Y"),
+				jsonObject.Value<int>("Width"),
+				jsonObject.Value<int>("Height")
+			);
+		}
+
+		public override bool CanConvert(Type objectType)
+		{
+			if (objectType != typeof(Rectangle))
+				return false;
+			return true;
+		}
+	}
+}
+