MonoGame.Samples/CatapultNetWars/Core/Screens/GameplayScreen.cs

//-----------------------------------------------------------------------------
// GameplayScreen.cs
//
// Microsoft XNA Community Game Platform
// Copyright (C) Microsoft Corporation. All rights reserved.
//-----------------------------------------------------------------------------

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using Microsoft.Xna.Framework.Audio;
using System.IO.IsolatedStorage;
using System.IO;
using Microsoft.Xna.Framework.Input;
using Microsoft.Xna.Framework.Input.Touch;

//using Microsoft.Devices.Sensors;
using GameStateManagement;
//using Microsoft.Xna.Framework.Net; // Not available in MonoGame 3.8

namespace CatapultGame
{
	class GameplayScreen : GameScreen
	{

		enum MessageType : byte
		{
			NewGame = 1,
			CatapultFiring = 2,
			CatapultAiming = 3,
			UpdateEnvironment = 4,
		}

		// internal NetworkSession NetworkSession { get; private set; } // Not available in MonoGame 3.8
		// PacketReader packetReader = new PacketReader (); // Not available in MonoGame 3.8
		// PacketWriter packetWriter = new PacketWriter (); // Not available in MonoGame 3.8
		internal bool IsNetworking { get; private set; }

		// Texture Members
		Texture2D foregroundTexture;
		Texture2D cloud1Texture;
		Texture2D cloud2Texture;
		Texture2D mountainTexture;
		Texture2D skyTexture;
		Texture2D hudBackgroundTexture;
		Texture2D ammoTypeTexture;
		Texture2D windArrowTexture;
		Texture2D defeatTexture;
		Texture2D victoryTexture;
		SpriteFont hudFont;

		// Rendering members
		Vector2 cloud1Position;
		Vector2 cloud2Position;
		Vector2 playerOneHUDPosition;
		Vector2 computerHUDPosition;
		Vector2 windArrowPosition;

		// Gameplay members
		Human playerOne;
		Human playerTwo;

		Vector2 wind;
		bool changeTurn;
		bool isFirstPlayerTurn;
		bool gameOver;
		Random random;
		const int minWind = 0;
		const int maxWind = 10;

		// Helper members
		bool isDragging;

		public GameplayScreen ()
		{
			EnabledGestures = GestureType.FreeDrag |
					GestureType.DragComplete |
					GestureType.Tap;

			random = new Random ();
		}

		/// <summary>
		/// Loads the game assets and initializes "players"
		/// </summary>
		public override void LoadContent ()
		{
			base.LoadContent ();
#if ANDROID || IPHONE || LINUX || WINDOWS
			LoadAssets();
#endif			
			// Start the game
			Start ();
		}

		public void LoadAssets ()
		{

			// NetworkSession = ScreenManager.Game.Services.GetService (typeof(NetworkSession)) as NetworkSession; // Not available in MonoGame 3.8
			// IsNetworking = NetworkSession != null; // Not available in MonoGame 3.8
			IsNetworking = false; // Disable networking for MonoGame 3.8

			// Load textures
			foregroundTexture = Load<Texture2D> ("Textures/Backgrounds/gameplay_screen");
			cloud1Texture = Load<Texture2D> ("Textures/Backgrounds/cloud1");
			cloud2Texture = Load<Texture2D> ("Textures/Backgrounds/cloud2");
			mountainTexture = Load<Texture2D> ("Textures/Backgrounds/mountain");
			skyTexture = Load<Texture2D> ("Textures/Backgrounds/sky");
			defeatTexture = Load<Texture2D> ("Textures/Backgrounds/defeat");
			victoryTexture = Load<Texture2D> ("Textures/Backgrounds/victory");
			hudBackgroundTexture = Load<Texture2D> ("Textures/HUD/hudBackground");
			windArrowTexture = Load<Texture2D> ("Textures/HUD/windArrow");
			ammoTypeTexture = Load<Texture2D> ("Textures/HUD/ammoType");
			// Load font
			hudFont = Load<SpriteFont> ("Fonts/HUDFont");

			// Define initial cloud position
			cloud1Position = new Vector2 (224 - cloud1Texture.Width, 32);
			cloud2Position = new Vector2 (64, 90);

			// Define initial HUD positions
			playerOneHUDPosition = new Vector2 (7, 7);
			computerHUDPosition = new Vector2 (613, 7);
			windArrowPosition = new Vector2 (345, 46);


			// Initialize human & other players
			if (IsNetworking) {
				// Networking code disabled in MonoGame 3.8
				// Set up default single player game instead
				playerOne = new Human (ScreenManager.Game, ScreenManager.SpriteBatch, PlayerSide.Left);
				playerOne.Initialize ();
				playerOne.Name = "Player 1";
				playerTwo = new AI (ScreenManager.Game, ScreenManager.SpriteBatch);
				playerTwo.Initialize ();
				playerTwo.Name = "Player 2";
			} else {
				playerOne = new Human (ScreenManager.Game, ScreenManager.SpriteBatch, PlayerSide.Left);
				playerOne.Initialize ();
				playerOne.Name = "Player 1";
				playerTwo = new AI (ScreenManager.Game, ScreenManager.SpriteBatch);
				playerTwo.Initialize ();
				playerTwo.Name = "Player 2";
			}

			// Identify enemies		playerOne.Enemy = playerTwo;
		playerTwo.Enemy = playerOne;
	}

	/// <summary>
	/// Runs one frame of update for the game.
	/// </summary>
	/// <param name="gameTime">Provides a snapshot of timing values.</param>
	public override void Update (GameTime gameTime, bool otherScreenHasFocus, bool coveredByOtherScreen)
		{
			float elapsed = (float)gameTime.ElapsedGameTime.TotalSeconds;

			// Check it one of the players reached 5 and stop the game
			if ((playerOne.Catapult.GameOver || playerTwo.Catapult.GameOver) &&
 				(gameOver == false)) {

				gameOver = true;
			if (IsNetworking) {
				// if (NetworkSession.IsHost) { // Not available in MonoGame 3.8
				//	if (playerOne.Score > playerTwo.Score) {
				//		AudioManager.PlaySound ("gameOver_Win");
				//	} else {
				//		AudioManager.PlaySound ("gameOver_Lose");
				//	}
				// }
				// else {
				//	if (playerOne.Score > playerTwo.Score) {
				//		AudioManager.PlaySound ("gameOver_Lose");
				//	} else {
				//		AudioManager.PlaySound ("gameOver_Win");
				//	}
				// }
				// Simple fallback - play win sound for player 1 if they have higher score
				if (playerOne.Score > playerTwo.Score) {
					AudioManager.PlaySound ("gameOver_Win");
				} else {
					AudioManager.PlaySound ("gameOver_Lose");
				}
			}
				else {
					if (playerOne.Score > playerTwo.Score) {
						AudioManager.PlaySound ("gameOver_Win");
					} else {
						AudioManager.PlaySound ("gameOver_Lose");
					}
				}
				return;
			}

			// If Reset flag raised and both catapults are not animating - 
			// active catapult finished the cycle, new turn!
			if ((playerOne.Catapult.CurrentState == CatapultState.Reset ||
				playerTwo.Catapult.CurrentState == CatapultState.Reset) &&
				!(playerOne.Catapult.AnimationRunning ||
				playerTwo.Catapult.AnimationRunning)) {

				changeTurn = true;

				if (playerOne.IsActive == true) { //Last turn was a human turn?
					playerOne.IsActive = false;
					playerTwo.IsActive = true;
					isFirstPlayerTurn = false;
					playerOne.Catapult.CurrentState = CatapultState.Idle;
					if (playerTwo.IsAI)
						playerTwo.Catapult.CurrentState = CatapultState.Aiming;
					else
						playerTwo.Catapult.CurrentState = CatapultState.Idle;
				} else { //It was an AI turn
					playerOne.IsActive = true;
					playerTwo.IsActive = false;
					isFirstPlayerTurn = true;
					playerTwo.Catapult.CurrentState = CatapultState.Idle;
					playerOne.Catapult.CurrentState = CatapultState.Idle;
				}
			}

			if (changeTurn) {
				// Update wind
				wind = new Vector2 (random.Next (-1, 2), random.Next (minWind, maxWind + 1));

				// Set new wind value to the players and
				playerOne.Catapult.Wind = playerTwo.Catapult.Wind = wind.X > 0 ? wind.Y : -wind.Y;
				changeTurn = false;
			}

			// Update the players
			playerOne.Update (gameTime);
			playerTwo.Update (gameTime);

			// Updates the clouds position
			UpdateClouds (elapsed);
			// UpdateNetworkSession (); // Disabled - networking not available in MonoGame 3.8
			base.Update (gameTime, otherScreenHasFocus, coveredByOtherScreen);
		}

		/// <summary>
		/// Draw the game world, effects, and HUD
		/// </summary>
		/// <param name="gameTime">The elapsed time since last Draw</param>
		public override void Draw (GameTime gameTime)
		{
			ScreenManager.SpriteBatch.Begin ();

			// Render all parts of the screen
			DrawBackground ();
			DrawComputer (gameTime);
			DrawPlayer (gameTime);
			DrawHud ();

			ScreenManager.SpriteBatch.End ();
		}

		/// <summary>
		/// Input helper method provided by GameScreen.  Packages up the various input
		/// values for ease of use.
		/// </summary>
		/// <param name="input">The state of the gamepads</param>
		public override void HandleInput (InputState input)
		{

			if (input == null)
				throw new ArgumentNullException ("input");

			if (gameOver) {
				if (input.IsPauseGame (null)) {
					FinishCurrentGame ();
				}

				if (input.MouseGesture.HasFlag(MouseGestureType.LeftClick))
					FinishCurrentGame();

				foreach (GestureSample gestureSample in input.Gestures) {
					if (gestureSample.GestureType == GestureType.Tap) {
						FinishCurrentGame ();
					}
				}

				return;
			}
		// if (NetworkSession != null) { // Not available in MonoGame 3.8
		//	if ((isFirstPlayerTurn && !NetworkSession.IsHost)
		//	    || (!isFirstPlayerTurn && NetworkSession.IsHost))
		//		return;
		// }

			if (input.IsPauseGame (null)) {
				PauseCurrentGame ();
			} else if (isFirstPlayerTurn &&
					(playerOne.Catapult.CurrentState == CatapultState.Idle ||
					playerOne.Catapult.CurrentState == CatapultState.Aiming)) {

				// First we try with mouse input
				playerOne.HandleInput (input);
				isDragging = playerOne.isDragging;

				// Read all available gestures
				foreach (GestureSample gestureSample in input.Gestures) {
					if (gestureSample.GestureType == GestureType.FreeDrag)
						isDragging = true;
					else if (gestureSample.GestureType == GestureType.DragComplete)
						isDragging = false;

					playerOne.HandleInput (gestureSample);
				}
			} else if (!isFirstPlayerTurn &&
					(playerTwo.Catapult.CurrentState == CatapultState.Idle ||
					playerTwo.Catapult.CurrentState == CatapultState.Aiming)) {

				// First we try with mouse input
				playerTwo.HandleInput (input);
				isDragging = playerTwo.isDragging;

				// Read all available gestures
				foreach (GestureSample gestureSample in input.Gestures) {
					if (gestureSample.GestureType == GestureType.FreeDrag)
						isDragging = true;
					else if (gestureSample.GestureType == GestureType.DragComplete)
						isDragging = false;

					playerTwo.HandleInput (gestureSample);
				}
			}
		}

		/*
		// Networking methods disabled in MonoGame 3.8
		Vector3 catapultInfoVector = Vector3.Zero;
		void UpdateNetworkSession ()
		{
			if (NetworkSession == null)
				return;

			if (NetworkSession.IsHost) {
				packetWriter.Write((int)MessageType.UpdateEnvironment);
				packetWriter.Write(wind);
				packetWriter.Write(cloud1Position);
				packetWriter.Write(cloud2Position);

				// Update our locally controlled tanks, and send their
				// latest position data to everyone in the session.
				foreach (LocalNetworkGamer gamer in NetworkSession.LocalGamers) {
					gamer.SendData(packetWriter, SendDataOptions.ReliableInOrder);
				}
			}

			if (playerOne.Catapult.CurrentState == CatapultState.Aiming) {
				SendCatapultInfo(MessageType.CatapultAiming, playerOne);
			}

			if (playerOne.Catapult.CurrentState == CatapultState.Firing) {

				SendCatapultInfo(MessageType.CatapultFiring, playerOne);
			}

			if (playerTwo.Catapult.CurrentState == CatapultState.Aiming) {
				SendCatapultInfo(MessageType.CatapultAiming, playerTwo);
			}

			if (playerTwo.Catapult.CurrentState == CatapultState.Firing) {
				SendCatapultInfo(MessageType.CatapultFiring, playerTwo);
			}

			// Pump the underlying session object.
			NetworkSession.Update ();

			// Make sure the session has not ended.
			if (NetworkSession == null)
				return;

			// Read any packets
			foreach (LocalNetworkGamer gamer in NetworkSession.LocalGamers) {
				ReadIncomingPackets (gamer);
			}
		}

		void SendCatapultInfo (MessageType messageType,  Human player)
		{
			packetWriter.Write((int)messageType);
			catapultInfoVector.X = player.Catapult.ShotStrength;
			catapultInfoVector.Y = player.Catapult.ShotVelocity;
			catapultInfoVector.Z = player.ArrowScale;
			packetWriter.Write(catapultInfoVector);

			// Update our locally controlled catapults, and send their
			// latest position data to everyone in the session.
			foreach (LocalNetworkGamer gamer in NetworkSession.LocalGamers) {
				gamer.SendData(packetWriter, SendDataOptions.ReliableInOrder);
			}
		}

		/// <summary>
		/// Helper for reading incoming network packets.
		/// </summary>
		void ReadIncomingPackets (LocalNetworkGamer gamer)
		{
			// Keep reading as long as incoming packets are available.
			while (gamer.IsDataAvailable) {
				NetworkGamer sender;

				// Read a single packet from the network.
				gamer.ReceiveData (packetReader, out sender);

				// Discard packets sent by local gamers: we already know their state!
				if (sender.IsLocal)
					continue;

				MessageType msgType = (MessageType)packetReader.ReadInt32 ();
				switch (msgType) {
				case MessageType.NewGame:
					//ReceiveNewNetworkedGame();
					break;
				case MessageType.CatapultAiming:

					if (isFirstPlayerTurn && !NetworkSession.IsHost) {
						playerOne.Catapult.CurrentState = CatapultState.Aiming;
						playerOne.isDragging = true;

						catapultInfoVector = packetReader.ReadVector3();

						playerOne.Catapult.ShotStrength = catapultInfoVector.X;
						playerOne.Catapult.ShotVelocity = catapultInfoVector.Y;
						playerOne.ArrowScale = catapultInfoVector.Z;

					}
					if (!isFirstPlayerTurn && NetworkSession.IsHost) {

						playerTwo.Catapult.CurrentState = CatapultState.Aiming;
						playerTwo.isDragging = true;

						catapultInfoVector = packetReader.ReadVector3();

						playerTwo.Catapult.ShotStrength = catapultInfoVector.X;
						playerTwo.Catapult.ShotVelocity = catapultInfoVector.Y;
						playerTwo.ArrowScale = catapultInfoVector.Z;

					}
					break;
				case MessageType.CatapultFiring:

					if (isFirstPlayerTurn  && !NetworkSession.IsHost) {
						catapultInfoVector = packetReader.ReadVector3();
						playerOne.Catapult.Fire (catapultInfoVector.Y);
						playerOne.Catapult.CurrentState = CatapultState.Firing;
						playerOne.ResetDragState();
					}
					if (!isFirstPlayerTurn  && NetworkSession.IsHost) {
						catapultInfoVector = packetReader.ReadVector3();
						playerTwo.Catapult.Fire (catapultInfoVector.Y);
						playerTwo.Catapult.CurrentState = CatapultState.Firing;
						playerTwo.ResetDragState();
					}
					break;
				case MessageType.UpdateEnvironment:
					wind = packetReader.ReadVector2();
					cloud1Position = packetReader.ReadVector2();
					cloud2Position = packetReader.ReadVector2();
					// Set new wind value to the players and
					playerOne.Catapult.Wind = playerTwo.Catapult.Wind = wind.X > 0 ? wind.Y : -wind.Y;
					break;
				}
			}
		}
		*/
		// End networking methods

		private void UpdateClouds (float elapsedTime)
		{
			// Move the clouds according to the wind
			int windDirection = wind.X > 0 ? 1 : -1;

			cloud1Position += new Vector2 (24.0f, 0.0f) * elapsedTime *
                windDirection * wind.Y;
			if (cloud1Position.X > ScreenManager.GraphicsDevice.Viewport.Width)
				cloud1Position.X = -cloud1Texture.Width * 2.0f;
			else if (cloud1Position.X < -cloud1Texture.Width * 2.0f)
				cloud1Position.X = ScreenManager.GraphicsDevice.Viewport.Width;

			cloud2Position += new Vector2 (16.0f, 0.0f) * elapsedTime *
                windDirection * wind.Y;
			if (cloud2Position.X > ScreenManager.GraphicsDevice.Viewport.Width)
				cloud2Position.X = -cloud2Texture.Width * 2.0f;
			else if (cloud2Position.X < -cloud2Texture.Width * 2.0f)
				cloud2Position.X = ScreenManager.GraphicsDevice.Viewport.Width;
		}

		/// <summary>
		/// Draws the player's catapult
		/// </summary>
		void DrawPlayer (GameTime gameTime)
		{
			if (!gameOver)
				playerOne.Draw (gameTime);
		}

		/// <summary>
		/// Draws the AI's catapult
		/// </summary>
		void DrawComputer (GameTime gameTime)
		{
			if (!gameOver)
				playerTwo.Draw (gameTime);
		}

		/// <summary>
		/// Draw the sky, clouds, mountains, etc. 
		/// </summary>
		private void DrawBackground ()
		{
			// Clear the background
			ScreenManager.Game.GraphicsDevice.Clear (Color.White);

			// Draw the Sky
			ScreenManager.SpriteBatch.Draw (skyTexture, Vector2.Zero, Color.White);

			// Draw Cloud #1
			ScreenManager.SpriteBatch.Draw (cloud1Texture,
                cloud1Position, Color.White);

			// Draw the Mountain
			ScreenManager.SpriteBatch.Draw (mountainTexture,
                Vector2.Zero, Color.White);

			// Draw Cloud #2
			ScreenManager.SpriteBatch.Draw (cloud2Texture,
                cloud2Position, Color.White);

			// Draw the Castle, trees, and foreground 
			ScreenManager.SpriteBatch.Draw (foregroundTexture,
                Vector2.Zero, Color.White);
		}

		/// <summary>
		/// Draw the HUD, which consists of the score elements and the GAME OVER tag.
		/// </summary>
		void DrawHud ()
		{
			if (gameOver) {
				Texture2D texture;			if (IsNetworking) {
				// if (NetworkSession.IsHost) { // Not available in MonoGame 3.8
				//	if (playerOne.Score > playerTwo.Score) {
				//		texture = victoryTexture;
				//	} else {
				//		texture = defeatTexture;
				//	}
				// }
				// else {
				//	if (playerOne.Score > playerTwo.Score) {
				//		texture = defeatTexture;
				//	} else {
				//		texture = victoryTexture;
				//	}
				// }
				// Simple fallback - show victory for player 1 if they have higher score
				if (playerOne.Score > playerTwo.Score) {
					texture = victoryTexture;
				} else {
					texture = defeatTexture;
				}
			}
				else {
					if (playerOne.Score > playerTwo.Score) {
						texture = victoryTexture;
					} else {
						texture = defeatTexture;
					}
				}

				ScreenManager.SpriteBatch.Draw (texture,
				                                new Vector2 (ScreenManager.Game.GraphicsDevice.Viewport.Width / 2 - texture.Width / 2,
				             ScreenManager.Game.GraphicsDevice.Viewport.Height / 2 - texture.Height / 2),
				                                Color.White);
			} else {
				// Draw Player Hud
				ScreenManager.SpriteBatch.Draw (hudBackgroundTexture, playerOneHUDPosition, Color.White);
				ScreenManager.SpriteBatch.Draw (ammoTypeTexture, playerOneHUDPosition + new Vector2 (33, 35), Color.White);
				DrawString (hudFont, playerOne.Score.ToString (), playerOneHUDPosition + new Vector2 (123, 35), Color.White);
				DrawString (hudFont, playerOne.Name, playerOneHUDPosition + new Vector2 (40, 1), Color.Blue);

				// Draw Computer Hud
				ScreenManager.SpriteBatch.Draw (hudBackgroundTexture, computerHUDPosition, Color.White);
				ScreenManager.SpriteBatch.Draw (ammoTypeTexture, computerHUDPosition + new Vector2 (33, 35), Color.White);
				DrawString (hudFont, playerTwo.Score.ToString (), computerHUDPosition + new Vector2 (123, 35), Color.White);
				DrawString (hudFont, playerTwo.Name, computerHUDPosition + new Vector2 (40, 1), Color.Red);

				// Draw Wind direction
				string text = "WIND";
				Vector2 size = hudFont.MeasureString (text);
				Vector2 windarrowScale = new Vector2 (wind.Y / 10, 1);
				ScreenManager.SpriteBatch.Draw (windArrowTexture,
				                                windArrowPosition, null, Color.White, 0, Vector2.Zero,
				                                windarrowScale, wind.X > 0 ? SpriteEffects.None : SpriteEffects.FlipHorizontally, 0);

				DrawString (hudFont, text, windArrowPosition - new Vector2 (0, size.Y), Color.Black);
				if (wind.Y == 0) {
					text = "NONE";
					DrawString (hudFont, text, windArrowPosition, Color.Black);
				}
			if (IsNetworking) {
				if (isFirstPlayerTurn) {
					// if (NetworkSession.IsHost) { // Not available in MonoGame 3.8
					//	// Prepare player one prompt message
					//	text = !isDragging ? "Drag Anywhere to Fire" : "Release to Fire!";
					// }
					// else {
					//	text = "Waiting for " + playerOne.Name;
					// }
					// Simple fallback - assume player 1 is local
					text = !isDragging ? "Drag Anywhere to Fire" : "Release to Fire!";
				} else {
					// if (NetworkSession.IsHost) { // Not available in MonoGame 3.8
					//	// Prepare player one prompt message
					//	text = "Waiting for " + playerTwo.Name;
					// }
					// else {
					//	text = !isDragging ? "Drag Anywhere to Fire" : "Release to Fire!";
					// }
					// Simple fallback - assume player 2 is local
					text = !isDragging ? "Drag Anywhere to Fire" : "Release to Fire!";
				}
			}
				else {
					if (isFirstPlayerTurn) {
						// Prepare player one prompt message
						text = !isDragging ? "Drag Anywhere to Fire" : "Release to Fire!";
					} else {
						// Prepare other player message
						text = "I'll get you yet!";
					}
				}
				size = hudFont.MeasureString (text);

				DrawString (hudFont, text,
				            new Vector2 (ScreenManager.GraphicsDevice.Viewport.Width / 2 - size.X / 2,
				             ScreenManager.GraphicsDevice.Viewport.Height - size.Y),
				            Color.Green);
			}
		}

		/// <summary>
		/// A simple helper to draw shadowed text.
		/// </summary>
		void DrawString (SpriteFont font, string text, Vector2 position, Color color)
		{
			ScreenManager.SpriteBatch.DrawString (font, text,
                new Vector2 (position.X + 1, position.Y + 1), Color.Black);
			ScreenManager.SpriteBatch.DrawString (font, text, position, color);
		}

		/// <summary>
		/// A simple helper to draw shadowed text.
		/// </summary>
		void DrawString (SpriteFont font, string text, Vector2 position, Color color, float fontScale)
		{
			ScreenManager.SpriteBatch.DrawString (font, text, new Vector2 (position.X + 1,
                position.Y + 1), Color.Black, 0, new Vector2 (0, font.LineSpacing / 2),
                fontScale, SpriteEffects.None, 0);
			ScreenManager.SpriteBatch.DrawString (font, text, position, color, 0,
                new Vector2 (0, font.LineSpacing / 2), fontScale, SpriteEffects.None, 0);
		}

		/// <summary>
		/// Finish the current game
		/// </summary>
		private void FinishCurrentGame ()
		{
			ExitScreen ();
		}

		/// <summary>
		/// Pause the current game
		/// </summary>
		private void PauseCurrentGame ()
		{
			var pauseMenuBackground = new BackgroundScreen ();

			if (isDragging) {
				isDragging = false;
				playerOne.Catapult.CurrentState = CatapultState.Idle;
			}

			ScreenManager.AddScreen (pauseMenuBackground, null);
			ScreenManager.AddScreen (new PauseScreen (pauseMenuBackground, playerOne, playerTwo), null);
		}

		/// <summary>
		/// Starts a new game session, setting all game states to initial values.
		/// </summary>
		void Start ()
		{
			// Set initial wind direction
			wind = Vector2.Zero;
			isFirstPlayerTurn = false;
			changeTurn = true;
			playerTwo.Catapult.CurrentState = CatapultState.Reset;
		}
	}
}