public void ChangeGameState(GameConstants.GameState newState)
{
switch (newState)
{
case (GameConstants.GameState.Overworld):
//Change sprite state if needed
if (GameStateMgr._instance.CurrentState == GameConstants.GameState.Combat)
{
//hide the player sprite
PlayerStateManager.Instance.ChangeSpriteVisibleState();
}
//Update game state
GameStateMgr._instance.CurrentState = GameConstants.GameState.Overworld;
break;
case (GameConstants.GameState.Combat):
if (GameStateMgr._instance.CurrentState != GameConstants.GameState.Combat)
{
//hide the player sprite
PlayerStateManager.Instance.ChangeSpriteVisibleState();
}
//Update game state
GameStateMgr._instance.CurrentState = GameConstants.GameState.Combat;
break;
default:
//No match, so exit case
break;
}
}
/// <summary>
/// Allows the game to run logic such as updating the world,
/// checking for collisions, gathering input, and playing audio.
/// </summary>
/// <param name="gameTime">Provides a snapshot of timing values.</param>
protected override void Update(GameTime gameTime)
{
currentKeyboardState = Keyboard.GetState();
currentGamePadState = GamePad.GetState(PlayerIndex.One);
// check to see if we should enable full screen
if (currentKeyboardState.IsKeyDown(Keys.LeftControl) && currentKeyboardState.IsKeyDown(Keys.F) &&
(prevKeyBoardState.IsKeyUp(Keys.LeftControl) || prevKeyBoardState.IsKeyUp(Keys.F)) &&
currentGameState != GameConstants.GameState.Playing && currentGameState != GameConstants.GameState.Ready)
{
ToggleFullScreen();
}
if (currentGameState == GameConstants.GameState.Title) // currently at the title screen
{
if (currentKeyboardState.IsKeyDown(Keys.H) && prevKeyBoardState.IsKeyUp(Keys.H))
{
// test if user wants to go to highscore screen
prevGameState = currentGameState;
currentGameState = GameConstants.GameState.HighScoreScreen;
highScoreScreen.Update();
}
else if (currentKeyboardState.IsKeyDown(Keys.I) && prevKeyBoardState.IsKeyUp(Keys.I))
{
// test if user wants to go the instruction screen
prevGameState = currentGameState;
currentGameState = GameConstants.GameState.InstructionScreen;
}
else if (currentKeyboardState.IsKeyDown(Keys.C) && prevKeyBoardState.IsKeyUp(Keys.C))
{
// test if the user wants to go to the credits screen
prevGameState = currentGameState;
currentGameState = GameConstants.GameState.CreditsScreen;
}
else if (currentKeyboardState.IsKeyDown(Keys.Space) || currentGamePadState.Buttons.A == ButtonState.Pressed)
{
// test if the user wants to transition to playing
currentGameState = GameConstants.GameState.Intro;
enemies.SetUpIntroPositions(player.Position);
}
}
else if (currentGameState == GameConstants.GameState.Intro)
{
// play the introduction; the camera is set to view the world as the enemy does
player.AutoPilot(ref currentGameState); // have the player guide itself around the city
gameCamera.Update(player.ForwardDirection, enemies.EnemyIntroPosition, map.FloorPlan, device.Viewport.AspectRatio);
enemies.PlayIntro(player); // have an enemy 'chase' the player
if (((currentKeyboardState.IsKeyDown(Keys.Space) && prevKeyBoardState.IsKeyUp(Keys.Space)) ||
(prevGamePadState.Buttons.A == ButtonState.Pressed && currentGamePadState.Buttons.A == ButtonState.Released)) ||
currentGameState == GameConstants.GameState.Ready)
{
// test to see if the user wants to transition to the ready state
Reset();
currentGameState = GameConstants.GameState.Ready;
}
}
else if (currentGameState == GameConstants.GameState.Ready)
{
// set the stage before play begins
// focus the camera on the player, show the countdown, and play the engine noise
gameCamera.Update(player.ForwardDirection, player.Position, map.FloorPlan, device.Viewport.AspectRatio);
readyScreen.Update((float) gameTime.ElapsedGameTime.TotalSeconds, ref currentGameState);
player.PlayEngineNoise();
}
else if (currentGameState == GameConstants.GameState.Playing)
{
// implementation of the playing logic is done with the methods called below
// 1) the camera must be updated based on the player position and the location in the map
// 2) the enemies their positions with each go-around
// 3) the players must update based on user input
// 4) the score must be updated based on time elapsed
// 5) the bonuses must be updated based on time elapsed (this is to stop showing the bonus screen after a interval of time)
gameCamera.Update(player.ForwardDirection, player.Position, map.FloorPlan, device.Viewport.AspectRatio);
enemies.Update(player, map.FloorPlan, gameTime, ref currentGameState);
player.Update(currentKeyboardState, currentGamePadState, gameTime, ref map, ref currentGameState);
score.Update((float) gameTime.ElapsedGameTime.TotalSeconds, player);
map.Bonuses.Update((float)gameTime.ElapsedGameTime.TotalSeconds);
if (currentGameState == GameConstants.GameState.End)
{
// the game has transition to ending during the above method calls
// update the highscore and gameOverScreen
highScore.Update(score.Score);
gameOverScreen.Update(score.Score);
}
}
else if (currentGameState == GameConstants.GameState.End)
{
enemies.Update(player, map.FloorPlan, gameTime, ref currentGameState); // move the enemy torward the player
if (Keyboard.GetState().IsKeyDown(Keys.Space) || currentGamePadState.Buttons.A == ButtonState.Pressed)
{
// test if the user wants to begin player again
currentGameState = GameConstants.GameState.Ready;
Reset();
}
if (currentKeyboardState.IsKeyDown(Keys.H) && prevKeyBoardState.IsKeyUp(Keys.H))
{
// test if the user wants to display the highscore screen
prevGameState = currentGameState;
currentGameState = GameConstants.GameState.HighScoreScreen;
highScoreScreen.Update();
}
else if (currentKeyboardState.IsKeyDown(Keys.I) && prevKeyBoardState.IsKeyUp(Keys.I))
{
// test if the user wants to display the instructions screen
prevGameState = currentGameState;
currentGameState = GameConstants.GameState.InstructionScreen;
}
else if (currentKeyboardState.IsKeyDown(Keys.C) && prevKeyBoardState.IsKeyUp(Keys.C))
{
// test if the user wants to display the credits screen
prevGameState = currentGameState;
currentGameState = GameConstants.GameState.CreditsScreen;
}
}
else if (currentGameState == GameConstants.GameState.HighScoreScreen)
{
// we are at highscore screen, test if user wants to go back to prior state
if (currentKeyboardState.IsKeyDown(Keys.H) && prevKeyBoardState.IsKeyUp(Keys.H))
currentGameState = prevGameState;
}
else if (currentGameState == GameConstants.GameState.InstructionScreen)
{
// we are at instruction screen, test if user wants to go back to prior state
if (currentKeyboardState.IsKeyDown(Keys.I) && prevKeyBoardState.IsKeyUp(Keys.I))
currentGameState = prevGameState;
}
else if (currentGameState == GameConstants.GameState.CreditsScreen)
{
// we are at credits screen, test if user wants to go back to prior state
if (currentKeyboardState.IsKeyDown(Keys.C) && prevKeyBoardState.IsKeyUp(Keys.C))
currentGameState = prevGameState;
}
prevKeyBoardState = currentKeyboardState;
prevGamePadState = currentGamePadState;
base.Update(gameTime);
}
/// <summary>
/// Allows the game to perform any initialization it needs to before starting to run.
/// This is where it can query for any required services and load any non-graphic
/// related content. Calling base.Initialize will enumerate through any components
/// and initialize them as well.
/// </summary>
protected override void Initialize()
{
// set up the display window
graphics.PreferredBackBufferWidth = 500;
graphics.PreferredBackBufferHeight = 500;
graphics.ApplyChanges();
// update the ViewportHeight and ViewportWidth constants so the screens know
// how to draw themselves
GameConstants.ViewportHeight = graphics.GraphicsDevice.Viewport.Height;
GameConstants.ViewportWidth = graphics.GraphicsDevice.Viewport.Width;
// display title in the window
Window.Title = "Alien Attack";
// setup the state of the game
currentGameState = GameConstants.GameState.Title;
currentKeyboardState = Keyboard.GetState();
prevKeyBoardState = currentKeyboardState;
// set up the screens
titleScreen = new TitleScreen();
instructionScreen = new InstructionScreen();
highScoreScreen = new HighScoreScreen();
creditsScreen = new CreditsScreen();
introScreen = new IntroScreen();
readyScreen = new GetReadyScreen();
gameOverScreen = new GameOverScreen();
// set up the game objects
gameCamera = new Camera();
player = new Player();
enemies = new Enemies();
map = new Map();
miniMap = new MiniMap();
skybox = new Skybox();
// set up the ingame displays
score = new Score();
highScore = new HighScore();
// set up the soundtrack
gameSongs = new GameSongs();
base.Initialize();
}
