/// <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)
{
KeyboardState currentKeyboardState = Keyboard.GetState();
GamePadState currentGamepadState = GamePad.GetState(PlayerIndex.One);
if (GamePad.GetState(PlayerIndex.One).Buttons.Back == ButtonState.Pressed || currentKeyboardState.IsKeyDown(Keys.Escape))
{
Exit();
}
float dt = (float)gameTime.ElapsedGameTime.TotalSeconds;// difference in elapsed game time since last call
switch (gameState)
{
case GameState.Menu:
currentKeyboardState = Keyboard.GetState();
if (currentKeyboardState.IsKeyDown(Keys.Enter))
{
if (menuOption == MenuOption.Quit)
{
this.Exit();
}
else if (menuOption == MenuOption.Start)
{
gameState = GameState.Playing;
}
}
// move to the next option
// doing modulus by the number of options lets us wrap back around to the first option
// this also allows us to easily add / remove options later
else if (currentKeyboardState.IsKeyDown(Keys.Up) &&
lastKeyboardState.IsKeyUp(Keys.Up))
{
// up takes the absolute value in case it causes menuOption to go negative
menuOption = (MenuOption)Math.Abs((int)(menuOption - 1) % NUM_MENU_OPTIONS);
}
else if (currentKeyboardState.IsKeyDown(Keys.Down) &&
lastKeyboardState.IsKeyUp(Keys.Down))
{
menuOption = (MenuOption)((int)(menuOption + 1) % NUM_MENU_OPTIONS);
}
break;
case GameState.Playing:
//gamePadState = GamePad.GetState(bike.PlayerIndex);
currentKeyboardState = Keyboard.GetState();
for (int i = Actor.Actors.Count - 1; i >= 0; i--)
{
Actor actor = Actor.Actors[i];
actor.Update(gameTime);
Bike bike = actor as Bike;
if (bike != null)
{
if (currentKeyboardState.IsKeyDown(GetKey(bike.PlayerIndex, Direction.Up)))
{
bike.ChangeDirection(Direction.Up);
}
else if (currentKeyboardState.IsKeyDown(GetKey(bike.PlayerIndex, Direction.Down)))
{
bike.ChangeDirection(Direction.Down);
}
else if (currentKeyboardState.IsKeyDown(GetKey(bike.PlayerIndex, Direction.Left)))
{
bike.ChangeDirection(Direction.Left);
}
else if (currentKeyboardState.IsKeyDown(GetKey(bike.PlayerIndex, Direction.Right)))
{
bike.ChangeDirection(Direction.Right);
}
//double speedRange = BikeStopThreshold - BikeMoveInterval;
//bike.MoveInterval = gamePadState.Triggers.Right * speedRange + BikeMoveInterval;
}
}
if (currentKeyboardState.IsKeyDown(Keys.P) &&
lastKeyboardState.IsKeyUp(Keys.P))
{
gameState = GameState.Paused;
}
break;
case GameState.Collision:
currentKeyboardState = Keyboard.GetState();
timeSinceCollision += dt;
if (timeSinceCollision < EXPLOSION_TIME)
{
UpdateExplosions(dt);
}
// ENTER restarts the game
if (currentKeyboardState.IsKeyDown(Keys.Enter))
{
timeSinceCollision = 0f;
CreateScene();
gameState = GameState.Playing;
}
break;
case GameState.Paused:
currentKeyboardState = Keyboard.GetState();
if (currentKeyboardState.IsKeyDown(Keys.P) &&
lastKeyboardState.IsKeyUp(Keys.P))
{
gameState = GameState.Playing;
}
break;
}
currentGamepadState = GamePad.GetState(PlayerIndex.One);
lastKeyboardState = currentKeyboardState;
base.Update(gameTime);
}