protected void VictoryConfirmed(DiscColor winner)
{
if (winner != DiscColor.None)
{
ShowPlayAgainMenu(winner);
}
else
{
if (BitBoardHelpers.GetOpenColumns(GetBitBoard()).Count == 0)
{
ShowPlayAgainDrawnMenu();
}
}
}
/// <summary>
/// Prompts bot to calculate move in the background
/// and updates game state accordingly after.
/// </summary>
protected async Task GetBotMoveAsync()
{
int botMove = await Task.Run(() => Bot.Move());
if (botMove == -1)
{
throw new InvalidOperationException("The bot did not return a valid column.");
}
_boardColumns[botMove].SetSpace(BotTurn);
ChangeTurn();
var winner = BitBoardHelpers.CheckVictory(GetBitBoard());
VictoryConfirmed(winner);
_botThinking = false;
}
/// <summary>
/// Returns the current column's state represented
/// in the first six positions of a BitBoard. These bits
/// should be shifted according to the columns position
/// and then OR'ed to get the board position.
/// </summary>
// TODO unit tests around this
public BitBoard GetBitColumn()
{
ulong redDiscs = 0;
ulong blackDiscs = 0;
for (int row = 0; row < LogicalBoardHelpers.NUM_ROWS; row++)
{
if (GetSpace(row) == DiscColor.Red)
{
redDiscs = BitBoardHelpers.SetSingleBit(redDiscs, row);
}
else if (GetSpace(row) == DiscColor.Black)
{
blackDiscs = BitBoardHelpers.SetSingleBit(blackDiscs, row);
}
else
{
break;
}
}
return(new BitBoard(redDiscs, blackDiscs));
}
/// <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 ||
Keyboard.GetState().IsKeyDown(Keys.Escape))
{
EndGame();
}
_timeSinceLastMove += gameTime.ElapsedGameTime.TotalSeconds;
// TODO should this be a seperate method?
// Handle user clicks that could be attempted moves.
// Contain mouse will not allow clicks on a full column.
LastMouseState = MouseState;
MouseState = Mouse.GetState();
Point mousePosition = new Point(MouseState.X, MouseState.Y);
switch (CurrentMenu)
{
case MenuState.Start:
if (LastMouseState.LeftButton == ButtonState.Pressed &&
MouseState.LeftButton == ButtonState.Released)
{
if (_startMenu.BlackDiscContainsMouse(mousePosition))
{
SetGameColors(DiscColor.Black);
break;
}
else if (_startMenu.RedDiscContainsMouse(mousePosition))
{
SetGameColors(DiscColor.Red);
break;
}
}
break;
case MenuState.None:
// Check for movement clicks
if (_timeSinceLastMove > 0.5)
{
if (CurrentTurn == PlayerTurn)
{
for (int col = 0; col < NUM_COLUMNS; col++)
{
if (_boardColumns[col].ContainMouse(mousePosition))
{
_boardColumns[col].IsFocused = true;
if (LastMouseState.LeftButton == ButtonState.Pressed &&
MouseState.LeftButton == ButtonState.Released)
{
//Perform move and change turn.
_boardColumns[col].SetSpace(PlayerTurn);
_boardColumns[col].IsFocused = false;
_timeSinceLastMove = 0.0;
ChangeTurn();
var winner = BitBoardHelpers.CheckVictory(GetBitBoard());
VictoryConfirmed(winner);
UpdateBotBoard();
}
}
else
{
_boardColumns[col].IsFocused = false;
}
}
}
else if (CurrentTurn == BotTurn)
{
if (!_botThinking)
{
_botThinking = true;
GetBotMoveAsync();
}
}
}
break;
case MenuState.PlayAgain:
case MenuState.PlayAgainDrawn:
// Detect a click on either of the buttons and respond accordingly.
if (LastMouseState.LeftButton == ButtonState.Pressed &&
MouseState.LeftButton == ButtonState.Released)
{
if (_playAgainMenu.YesButtonContainsMouse(mousePosition))
{
ResetGame();
break;
}
else if (_playAgainMenu.NoButtonContainsMouse(mousePosition))
{
EndGame();
break;
}
}
break;
}
base.Update(gameTime);
}
