// Method to check the players strategy and whether second turn they started in a corner or not
private void CornerMoveCheck(Button[] buttons)
{
if (_previousMove == 0 || _previousMove == 2 || _previousMove == 6 || _previousMove == 8 && buttons[_previousMove].Enabled == false)
{
_playerSecondTurnCornerStart = true;
}
else
{
_playerSecondTurnCornerStart = false;
}
}
// Gets called when it is the computers turn to move
private void OpponentMove(Button[] buttons)
{
// check who started the game first and if computer started goes into the if
if (!_playerStart)
{
// switches on the game turn count to determine where it should move
switch (_turnCount)
{
case 0:
buttons[4].PerformClick();
return;
case 2:
// algorithmn strategy for opponent corner move
CornerMoveCheck(buttons);
if (_playerSecondTurnCornerStart)
{
if (buttons[0].Enabled == false)
{
buttons[8].PerformClick();
}
else if (buttons[2].Enabled == false)
{
buttons[6].PerformClick();
}
else if (buttons[6].Enabled == false)
{
buttons[2].PerformClick();
}
else
{
buttons[0].PerformClick();
}
}
// Strategy for opponent side move
else
{
if (buttons[1].Enabled == false || buttons[7].Enabled == false)
{
buttons[5].PerformClick();
}
else if(buttons[3].Enabled == false || buttons[5].Enabled == false)
{
buttons[7].PerformClick();
}
}
return;
case 4:
// checks to see if player started with corner move
if (_playerSecondTurnCornerStart)
{
if (CheckForWinMove(buttons))
{
buttons[_winMove].PerformClick();
}
else if (CheckForBlockMove(buttons))
{
buttons[_blockMove].PerformClick();
}
else
{
CheckForNextMove(buttons);
buttons[_normalMove].PerformClick();
}
}
// if player started with side move
else
{
if (CheckForWinMove(buttons))
{
buttons[_winMove].PerformClick();
}
else if (CheckForBlockMove(buttons))
{
buttons[_blockMove].PerformClick();
}
else
{
if (_previousMove == 3)
{
buttons[2].PerformClick();
}
else
{
buttons[6].PerformClick();
}
}
}
return;
default:
// default move case
if (CheckForWinMove(buttons))
{
buttons[_winMove].PerformClick();
}
else if (CheckForBlockMove(buttons))
{
buttons[_blockMove].PerformClick();
}
else
{
CheckForNextMove(buttons);
buttons[_normalMove].PerformClick();
}
return;
}
}
// if the player started first
else
{
// switches on the players turn
switch (_turnCount)
{
// checks if the player started in the center or not then chooses move
case 1:
if (buttons[4].Enabled == true)
{
buttons[4].PerformClick();
}
else
{
CheckForNextMove(buttons);
buttons[_normalMove].PerformClick();
}
return;
// Check to counter Player setup for win
case 3:
if (CheckForBlockMove(buttons))
{
buttons[_blockMove].PerformClick();
}
else if (CheckForDoubleWin(buttons))
{
buttons[_blockDoubleWin].PerformClick();
}
else if (_previousMove == 8)
{
buttons[2].PerformClick();
}
else if (buttons[7].Enabled == true)
{
buttons[7].PerformClick();
}
else
{
buttons[5].PerformClick();
}
return;
// default computer move to tie game or win if player chooses bad move
default:
{
if (CheckForWinMove(buttons))
{
buttons[_winMove].PerformClick();
}
else if (CheckForBlockMove(buttons))
{
buttons[_blockMove].PerformClick();
}
else
{
CheckForNextMove(buttons);
buttons[_normalMove].PerformClick();
}
return;
}
}
}
}
// checks to see if someone has won the game
private void CheckWin(Button[] buttons)
{
// Pop up if you lose the game
var loseDialog = new AlertDialog.Builder (this).SetTitle("Sorry!,").SetMessage("You lost please try again.").SetPositiveButton("Restart",(sender, e) =>
{
Finish();
StartActivity(typeof(MainActivity));
}).Create();
// Pop up if you win the game
var winDialog = new AlertDialog.Builder (this).SetTitle("Congratulations!").SetMessage("You won.").SetPositiveButton("Restart",(sender, e) =>
{
Finish();
StartActivity(typeof(MainActivity));
}).Create();
// Pop up if you tie the game
var tieDialog = new AlertDialog.Builder (this).SetTitle("Tie Game!").SetPositiveButton("Restart",(sender, e) =>
{
Finish();
StartActivity(typeof(MainActivity));
}).Create();
if(buttons[0].Text == buttons[1].Text & buttons[1].Text == buttons[2].Text & buttons[0].Text != String.Empty)
{
foreach (var button in buttons)
{
if (button.Enabled)
{
button.Enabled = false;
}
}
if (_yourTurn)
{
winDialog.Show ();
}
else
{
loseDialog.Show ();
}
}
else if(buttons[3].Text == buttons[4].Text & buttons[4].Text == buttons[5].Text & buttons[3].Text != String.Empty)
{
foreach (var button in buttons)
{
if (button.Enabled)
{
button.Enabled = false;
}
}
if (_yourTurn)
{
winDialog.Show ();
}
else
{
loseDialog.Show ();
}
}
else if(buttons[6].Text == buttons[7].Text & buttons[7].Text == buttons[8].Text & buttons[6].Text != String.Empty)
{
foreach (var button in buttons)
{
if (button.Enabled)
{
button.Enabled = false;
}
}
if (_yourTurn)
{
winDialog.Show ();
}
else
{
loseDialog.Show ();
}
}
else if(buttons[0].Text == buttons[3].Text & buttons[3].Text == buttons[6].Text & buttons[0].Text != String.Empty)
{
foreach (var button in buttons)
{
if (button.Enabled)
{
button.Enabled = false;
}
}
if (_yourTurn)
{
winDialog.Show ();
}
else
{
loseDialog.Show ();
}
}
else if(buttons[1].Text == buttons[4].Text & buttons[4].Text == buttons[7].Text & buttons[1].Text != String.Empty)
{
foreach (var button in buttons)
{
if (button.Enabled)
{
button.Enabled = false;
}
}
if (_yourTurn)
{
winDialog.Show ();
}
else
{
loseDialog.Show ();
}
}
else if(buttons[2].Text == buttons[5].Text & buttons[5].Text == buttons[8].Text & buttons[2].Text != String.Empty)
{
foreach (var button in buttons)
{
if (button.Enabled)
{
button.Enabled = false;
}
}
if (_yourTurn)
{
winDialog.Show ();
}
else
{
loseDialog.Show ();
}
}
else if(buttons[0].Text == buttons[4].Text & buttons[4].Text == buttons[8].Text & buttons[0].Text != String.Empty)
{
foreach (var button in buttons)
{
if (button.Enabled)
{
button.Enabled = false;
}
}
if (_yourTurn)
{
winDialog.Show ();
}
else
{
loseDialog.Show ();
}
}
else if(buttons[2].Text == buttons[4].Text & buttons[4].Text == buttons[6].Text & buttons[2].Text != String.Empty)
{
foreach (var button in buttons)
{
if (button.Enabled)
{
button.Enabled = false;
}
}
if (_yourTurn)
{
winDialog.Show ();
}
else
{
loseDialog.Show ();
}
}
else if(_turnCount == 9)
{
foreach (var button in buttons)
{
if (button.Enabled)
{
button.Enabled = false;
}
}
tieDialog.Show ();
}
else
{
return;
}
}
// check for if computer has a move that will win the game
private bool CheckForWinMove(Button[] buttons)
{
// if computer started the game
if (!_playerStart)
{
if (buttons[1].Text == "X" & buttons[2].Text == "X" & buttons[0].Enabled == true)
{
_winMove = 0;
return true;
}
else if (buttons[0].Text == "X" & buttons[2].Text == "X" & buttons[1].Enabled == true)
{
_winMove = 1;
return true;
}
else if (buttons[0].Text == "X" & buttons[1].Text == "X" & buttons[2].Enabled == true)
{
_winMove = 2;
return true;
}
else if (buttons[4].Text == "X" & buttons[5].Text == "X" & buttons[3].Enabled == true)
{
_winMove = 3;
return true;
}
else if (buttons[3].Text == "X" & buttons[5].Text == "X" & buttons[4].Enabled == true)
{
_winMove = 4;
return true;
}
else if (buttons[3].Text == "X" & buttons[4].Text == "X" & buttons[5].Enabled == true)
{
_winMove = 5;
return true;
}
else if (buttons[7].Text == "X" & buttons[8].Text == "X" & buttons[6].Enabled == true)
{
_winMove = 6;
return true;
}
else if (buttons[6].Text == "X" & buttons[8].Text == "X" & buttons[7].Enabled == true)
{
_winMove = 7;
return true;
}
else if (buttons[6].Text == "X" & buttons[7].Text == "X" & buttons[8].Enabled == true)
{
_winMove = 8;
return true;
}
else if (buttons[0].Text == "X" & buttons[4].Text == "X" & buttons[8].Enabled == true)
{
_winMove = 8;
return true;
}
else if (buttons[4].Text == "X" & buttons[8].Text == "X" & buttons[0].Enabled == true)
{
_winMove = 0;
return true;
}
else if (buttons[6].Text == "X" & buttons[4].Text == "X" & buttons[2].Enabled == true)
{
_winMove = 2;
return true;
}
else if (buttons[2].Text == "X" & buttons[4].Text == "X" & buttons[6].Enabled == true)
{
_winMove = 6;
return true;
}
else if (buttons[3].Text == "X" & buttons[6].Text == "X" & buttons[0].Enabled == true)
{
_winMove = 0;
return true;
}
else if (buttons[4].Text == "X" & buttons[7].Text == "X" & buttons[1].Enabled == true)
{
_winMove = 1;
return true;
}
else if (buttons[5].Text == "X" & buttons[8].Text == "X" & buttons[2].Enabled == true)
{
_winMove = 2;
return true;
}
else if (buttons[0].Text == "X" & buttons[6].Text == "X" & buttons[3].Enabled == true)
{
_winMove = 3;
return true;
}
else if (buttons[1].Text == "X" & buttons[7].Text == "X" & buttons[4].Enabled == true)
{
_winMove = 4;
return true;
}
else if (buttons[2].Text == "X" & buttons[8].Text == "X" & buttons[5].Enabled == true)
{
_winMove = 5;
return true;
}
else if (buttons[0].Text == "X" & buttons[3].Text == "X" & buttons[6].Enabled == true)
{
_winMove = 6;
return true;
}
else if (buttons[1].Text == "X" & buttons[4].Text == "X" & buttons[7].Enabled == true)
{
_winMove = 7;
return true;
}
else if (buttons[2].Text == "X" & buttons[5].Text == "X" & buttons[8].Enabled == true)
{
_winMove = 8;
return true;
}
else
{
return false;
}
}
// if the player started the game
else
{
if (buttons[1].Text == "O" & buttons[2].Text == "O" & buttons[0].Enabled == true)
{
_winMove = 0;
return true;
}
else if (buttons[0].Text == "O" & buttons[2].Text == "O" & buttons[1].Enabled == true)
{
_winMove = 1;
return true;
}
else if (buttons[0].Text == "O" & buttons[1].Text == "O" & buttons[2].Enabled == true)
{
_winMove = 2;
return true;
}
else if (buttons[4].Text == "O" & buttons[5].Text == "O" & buttons[3].Enabled == true)
{
_winMove = 3;
return true;
}
else if (buttons[3].Text == "O" & buttons[5].Text == "O" & buttons[4].Enabled == true)
{
_winMove = 4;
return true;
}
else if (buttons[3].Text == "O" & buttons[4].Text == "O" & buttons[5].Enabled == true)
{
_winMove = 5;
return true;
}
else if (buttons[7].Text == "O" & buttons[8].Text == "O" & buttons[6].Enabled == true)
{
_winMove = 6;
return true;
}
else if (buttons[6].Text == "O" & buttons[8].Text == "O" & buttons[7].Enabled == true)
{
_winMove = 7;
return true;
}
else if (buttons[6].Text == "O" & buttons[7].Text == "O" & buttons[8].Enabled == true)
{
_winMove = 8;
return true;
}
else if (buttons[0].Text == "O" & buttons[4].Text == "O" & buttons[8].Enabled == true)
{
_winMove = 8;
return true;
}
else if (buttons[4].Text == "O" & buttons[8].Text == "O" & buttons[0].Enabled == true)
{
_winMove = 0;
return true;
}
else if (buttons[6].Text == "O" & buttons[4].Text == "O" & buttons[2].Enabled == true)
{
_winMove = 2;
return true;
}
else if (buttons[2].Text == "O" & buttons[4].Text == "O" & buttons[6].Enabled == true)
{
_winMove = 6;
return true;
}
else if (buttons[3].Text == "O" & buttons[6].Text == "O" & buttons[0].Enabled == true)
{
_winMove = 0;
return true;
}
else if (buttons[4].Text == "O" & buttons[7].Text == "O" & buttons[1].Enabled == true)
{
_winMove = 1;
return true;
}
else if (buttons[5].Text == "O" & buttons[8].Text == "O" & buttons[2].Enabled == true)
{
_winMove = 2;
return true;
}
else if (buttons[0].Text == "O" & buttons[6].Text == "O" & buttons[3].Enabled == true)
{
_winMove = 3;
return true;
}
else if (buttons[1].Text == "O" & buttons[7].Text == "O" & buttons[4].Enabled == true)
{
_winMove = 4;
return true;
}
else if (buttons[2].Text == "O" & buttons[8].Text == "O" & buttons[5].Enabled == true)
{
_winMove = 5;
return true;
}
else if (buttons[0].Text == "O" & buttons[3].Text == "O" & buttons[6].Enabled == true)
{
_winMove = 6;
return true;
}
else if (buttons[1].Text == "O" & buttons[4].Text == "O" & buttons[7].Enabled == true)
{
_winMove = 7;
return true;
}
else if (buttons[2].Text == "O" & buttons[5].Text == "O" & buttons[8].Enabled == true)
{
_winMove = 8;
return true;
}
else
{
return false;
}
}
}
// Check for a normal computer move starting with empty corners then moving to sides as backup
private void CheckForNextMove(Button[] buttons)
{
if (buttons[0].Enabled == true)
{
_normalMove = 0;
}
else if (buttons[2].Enabled == true)
{
_normalMove = 2;
}
else if (buttons[6].Enabled == true)
{
_normalMove = 6;
}
else if (buttons[8].Enabled == true)
{
_normalMove = 8;
}
else if (buttons[1].Enabled == true)
{
_normalMove = 1;
}
else if (buttons[3].Enabled == true)
{
_normalMove = 3;
}
else if (buttons[4].Enabled == true)
{
_normalMove = 4;
}
else if (buttons[5].Enabled == true)
{
_normalMove = 5;
}
else
{
_normalMove = 7;
}
}
// Method to prevent 3rd turn double win if player doesn't start in center
private bool CheckForDoubleWin(Button[] buttons)
{
if (buttons[5].Text == "X" & (buttons[7].Text == "X" || buttons[6].Text == "X"))
{
_blockDoubleWin = 8;
return true;
}
else if (buttons[5].Text == "X" & (buttons[1].Text == "X" || buttons[0].Text == "X"))
{
_blockDoubleWin = 2;
return true;
}
else if (buttons[3].Text == "X" & (buttons[7].Text == "X" || buttons[8].Text == "X"))
{
_blockDoubleWin = 6;
return true;
}
else if (buttons[3].Text == "X" & (buttons[1].Text == "X" || buttons[2].Text == "X"))
{
_blockDoubleWin = 0;
return true;
}
else if (buttons[7].Text == "X" & (buttons[5].Text == "X" || buttons[2].Text == "X"))
{
_blockDoubleWin = 8;
return true;
}
else if (buttons[7].Text == "X" & (buttons[3].Text == "X" || buttons[0].Text == "X"))
{
_blockDoubleWin = 6;
return true;
}
else if (buttons[1].Text == "X" & (buttons[3].Text == "X" || buttons[6].Text == "X"))
{
_blockDoubleWin = 0;
return true;
}
else if (buttons[1].Text == "X" & (buttons[5].Text == "X" || buttons[8].Text == "X"))
{
_blockDoubleWin = 2;
return true;
}
else if ((buttons[0].Text == "X" & buttons[8].Text == "X") || (buttons[2].Text == "X" & buttons[6].Text == "X"))
{
_blockDoubleWin = 3;
return true;
}
else
{
return false;
}
}
void changeButton( Button but, int column, int row )
{
// Update board
if (Record [row, column] == 0) {
Record [row, column] = turn;
// Check for a victory
checkVictory ();
// Swap turns
if (turn == 1) {
but.Text = "X";
turn = 2;
} else if ( turn == 2 ) {
but.Text = "O";
turn = 1;
}
} else {
dbg ("Please pick an empty slot.");
}
}
