/// <summary>
/// Removes the piece from the board that is at the specified location and sends it
/// back to the player's home
/// </summary>
/// <param name="location"></param>
public void RemovePiece(FieldLocation location)
{
// Find the piece at the specified location
foreach (var item in _pawns)
{
// If the Area and Position match, the piece is at the specified location
if (item.Location.Area == location.Area && item.Location.Position == location.Position)
{
// Find a free spot in the player's home
for (int i = 0; i < _pawns.Length; i++)
{
// If there are not any pieces that are in position i and that are not at home
// (pieces at the start of the board will not be confused for pieces being in the home)
// then spot is available
if (!_pawns.Any(p => p.Location.Position == i && p.Location.Area == _start))
{
// Put the piece back in the player's home
item.Location.Area = _start;
// Put the piece in the correct position in the player home
item.Location.Position = i;
return;
}
}
}
}
}
/// <summary>
/// Moves a piece from one location to another if the player has a piece in that location
/// </summary>
/// <param name="oldLocation"></param>
/// <param name="newLocation"></param>
public void MovePiece(FieldLocation oldLocation, FieldLocation newLocation)
{
foreach (var item in _pawns)
{
// If there is a piece in home and the old location is in the home
if ((_starts.Contains(oldLocation.Area) && item.Location.Area == oldLocation.Area) ||
// otherwise, if piece is in old location
(item.Location.Area == oldLocation.Area && item.Location.Position == oldLocation.Position))
{
// update the location
item.Location.Area = newLocation.Area;
item.Location.Position = newLocation.Position;
return;
}
}
}
/// <summary>
/// Constructor for objects of type pawn
/// </summary>
/// <param name="color"></param>
/// <param name="position"></param>
public Pawn(PlayerColor color, int position, Canvas fieldCanvas)
{
Color = color;
i = new Image();
BitmapImage bi = new BitmapImage();
bi.BeginInit();
if (color == PlayerColor.green)
{
Location = new FieldLocation(FieldArea.GreenHome, position);
bi.UriSource = new Uri("pack://application:,,,/Images/green.png");
}
else if (color == PlayerColor.yellow)
{
Location = new FieldLocation(FieldArea.YellowHome, position);
bi.UriSource = new Uri("pack://application:,,,/Images/yellow.png");
}
else if (color == PlayerColor.blue)
{
Location = new FieldLocation(FieldArea.BlueHome, position);
bi.UriSource = new Uri("pack://application:,,,/Images/blue.png");
}
else if (color == PlayerColor.red)
{
Location = new FieldLocation(FieldArea.RedHome, position);
bi.UriSource = new Uri("pack://application:,,,/Images/red.png");
}
else
{
throw new Exception("Invalid color for pawn.");
}
bi.DecodePixelWidth = 22;
bi.EndInit();
i.Source = bi;
fieldCanvas.Children.Add(i);
}
/// <summary>
/// Method that will attempt to move a piece and report the caller whether it was succesful
/// </summary>
/// <param name="player"></param>
/// <param name="location">Current location</param>
/// <returns></returns>
private bool AttemptMove(Player player, FieldLocation location)
{
// Calculate the new position
var newLocation = player.CalculateMove(location, Die);
// If the clicked location does not contain a player piece, return false
// Second condition prevents the game from getting stuck when a player only has pawns left
// that can move to their initial position in the end zone.
if (!player.HasPieceIn(location) && !Equals(location, newLocation))
{
return(false);
}
// Don't move if the player already has a piece in the new location
if (player.HasPieceIn(newLocation))
{
// unless the new location is a final location
if (!newLocation.IsFinal())
{
return(false);
}
}
// Move the piece
player.MovePiece(location, newLocation);
// Remove opponent piece, if needed
foreach (var item in _players)
{
// Only check opponents
if (item.Color != player.Color)
{
item.RemovePiece(newLocation);
}
}
return(true);
}
/// <summary>
/// Returns whether a player actually has a piece in the location and whether the player
/// can move this piece
/// </summary>
/// <param name="location"></param>
/// <returns></returns>
public bool HasPieceIn(FieldLocation location)
{
// If the player has clicked on a home
if (location.Area == FieldArea.GreenHome ||
location.Area == FieldArea.YellowHome ||
location.Area == FieldArea.BlueHome ||
location.Area == FieldArea.RedHome)
{
// ... then only Area needs to match
if (_pawns.Any(p => p.Location.Area == location.Area))
{
return(true);
}
}
// otherwise, both Area and position will need to match
if (_pawns.Any(p => p.Location.Area == location.Area && p.Location.Position == location.Position))
{
return(true);
}
return(false);
}
/// <summary>
/// Method that is called when the player clicks somewhere in the field.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Field_Click(object sender, RoutedEventArgs e)
{
// If a player has completed the game, all clicks will be ignored
if (_currentPhase == Phase.GameOver)
{
return;
}
// Only let the player move his piece after rolling the dice.
if (_currentPhase != Phase.ChooseMove)
{
_statusMessage = $"{ActivePlayerString()}{Environment.NewLine}You cannot move a piece, please roll the die.";
StatusBox.Text = _statusMessage;
return;
}
// Get the position of the mouse
var mp = Mouse.GetPosition(Application.Current.MainWindow);
// Find the location that corresponds to the position of the mouse
FieldLocation location = new FieldLocation(mp);
// If player can make a move, move
if (_players[_activePlayer].HasPieceIn(location) && AttemptMove(_players[_activePlayer], location))
{
// Update the screen
foreach (var item in _players)
{
item.Show(FieldCanvas);
}
// Make sure that the updated screen gets rendered now
FieldCanvas.Dispatcher.Invoke(delegate { }, DispatcherPriority.Render);
// Check if the game is over
if (_players[_activePlayer].HasWon())
{
_currentPhase = Phase.GameOver;
_statusMessage = $"Congratulations, you have won the game. The {ActivePlayerString()} player is the winner.";
StatusBox.Text = _statusMessage;
}
else // Update the game
{
_currentPhase = Phase.RollDie;
if (Die != 6)
{
// In two player games, make sure that two players play on opposing sides of the board
if (_numberOfPLayers == 2)
{
_activePlayer = _activePlayer == 0 ? 2 : 0;
}
else
{
++_activePlayer; // move to the next player
_activePlayer %= _numberOfPLayers; // move back to the first player, if needed
}
}
_statusMessage = $"{ActivePlayerString()}{Environment.NewLine}Please roll the die to continue.";
StatusBox.Text = _statusMessage;
}
}
else
{
// Notify user of invalid move
_statusMessage = $"{ActivePlayerString()}{Environment.NewLine}Invalid move, you cannot move that piece or do not have a piece at that position";
StatusBox.Text = _statusMessage;
}
}
public FieldLocation(FieldLocation location)
{
Area = location.Area;
Position = location.Position;
}
/// <summary>
/// Will calculate new position after move
/// </summary>
/// <param name="location"></param>
/// <param name="distance"></param>
/// <returns></returns>
public FieldLocation CalculateMove(FieldLocation location, int distance)
{
FieldLocation newLocation = new FieldLocation(location);
// Advance the player through the regular area and move to the appropriate finish area if needed
if (location.Area == FieldArea.SquareX)
{
newLocation.Position = location.Position + distance;
if (Color == PlayerColor.green && location.Position + distance > 51)
{
newLocation.Position -= 51;
newLocation.Area = FieldArea.GreenFinish;
}
if (Color == PlayerColor.yellow && newLocation.Position > 12 && location.Position < 13)
{
newLocation.Position -= 12;
newLocation.Area = FieldArea.YellowFinish;
}
if (Color == PlayerColor.blue && newLocation.Position > 25 && location.Position < 26)
{
newLocation.Position -= 25;
newLocation.Area = FieldArea.BlueFinish;
}
if (Color == PlayerColor.red && newLocation.Position > 38 && location.Position < 39)
{
newLocation.Position -= 38;
newLocation.Area = FieldArea.RedFinish;
}
newLocation.Position %= 52; // Only 52 regular positions on the board
}
// If player is in home
else if ((new FieldArea[] {
FieldArea.GreenHome,
FieldArea.YellowHome,
FieldArea.BlueHome,
FieldArea.RedHome
}).Contains(location.Area))
{
newLocation.Area = FieldArea.SquareX;
if (Color == PlayerColor.green)
{
newLocation.Position = distance + 0;
}
else if (Color == PlayerColor.yellow)
{
newLocation.Position = distance + 13;
}
else if (Color == PlayerColor.blue)
{
newLocation.Position = distance + 26;
}
else if (Color == PlayerColor.red)
{
newLocation.Position = distance + 39;
}
}
// Player is in finish area
else
{
newLocation.Position += distance;
if (newLocation.Position > 6)
{
newLocation.Position = 6 - (newLocation.Position - 6);
}
}
return(newLocation);
}
