/// <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)
{
if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed)
{
this.Exit();
}
KeyboardState keyState = Keyboard.GetState();
switch (gameState)
{
case GameStates.TitleScreen:
titleScreenTimer +=
(float)gameTime.ElapsedGameTime.TotalSeconds;
if (titleScreenTimer >= titleScreenDelayTime)
{
if ((Keyboard.GetState().IsKeyDown(Keys.Space)) ||
(GamePad.GetState(PlayerIndex.One).Buttons.A ==
ButtonState.Pressed))
{
gameState = GameStates.Playing;
}
}
break;
case GameStates.Playing:
if (keyState.IsKeyDown(Keys.Down) && snake1.Facing != 2)
{
snake1.Facing = 0;
}
else if (keyState.IsKeyDown(Keys.Right) && snake1.Facing != 3)
{
snake1.Facing = 1;
}
else if (keyState.IsKeyDown(Keys.Up) && snake1.Facing != 0)
{
snake1.Facing = 2;
}
else if (keyState.IsKeyDown(Keys.Left) && snake1.Facing != 1)
{
snake1.Facing = 3;
}
if (snake1.CheckCollisions(this.Window) || snake1.isAlive == false)
{
snake1.isAlive = false;
gameState = GameStates.GameOver;
}
if (timeRemaining == 0.0f)
{
snake1.Update();
if (snake1.DidEatPellet(Pellet))
{
NewPellet();
score++;
}
timeRemaining = timeTotal;
}
timeRemaining = MathHelper.Max(0, timeRemaining -
(float)gameTime.ElapsedGameTime.TotalSeconds);
break;
case GameStates.GameOver:
snake1 = new Snake(600, 200, 22, WhiteScheme.ToList());
break;
}
base.Update(gameTime);
}
