/// <summary>Checks if Bishop move is legal.</summary>
public bool bishopLegal(gameSquare[,] chessBoard, int x1, int y1, int x2, int y2)
{
if (Math.Abs (x1 - x2) == Math.Abs (y1 - y2)) {
if (x1 < x2) {
if (y1 < y2) {
int j = y1 + 1;
for (int i = x1 + 1; i < x2; i++) {
if (chessBoard [i, j].piece != chessman.empty) {
return false;
}
j++;
}
return true;
} else if (y2 < y1) {
int j = y1 - 1;
for (int i = x1 + 1; i < x2; i++) {
if (chessBoard [i, j].piece != chessman.empty) {
return false;
}
j--;
}
return true;
}
} else if (x2 < x1) {
if (y1 < y2) {
int j = y1 + 1;
for (int i = x1 - 1; i > x2; i--) {
if (chessBoard [i, j].piece != chessman.empty) {
return false;
}
j++;
}
return true;
} else if (y2 < y1) {
int j = y1 - 1;
for (int i = x1 - 1; i > x2; i--) {
if (chessBoard [i, j].piece != chessman.empty) {
return false;
}
j--;
}
return true;
}
}
}
return false;
}
/// <summary>Get last move made by other player,
/// false is returned if no move yet made.</summary>
public bool getLastMove(gameSquare[,] chessBoard)
{
try {
string toSend = "GETMOVE";
socket.getOut().WriteLine(toSend);
socket.getOut().Flush();
string recieve;
recieve = socket.getIn().ReadLine();
string[] recieveSplit;
recieveSplit = recieve.Split(' ');
if (recieveSplit [0] == "MOVE")
{
int x1 = Convert.ToInt32(recieveSplit [1]);
int y1 = Convert.ToInt32(recieveSplit [2]);
int x2 = Convert.ToInt32(recieveSplit [3]);
int y2 = Convert.ToInt32(recieveSplit [4]);
// the move made by player 2
if (chessBoard[x2, y2].piece == chessman.King)
{
endGame = true;
}
if (chessBoard[x1, y1].piece == chessman.Pawn && (x2 == 0 || x2 == 7))
{
chessBoard[x1, y1].piece = chessman.Queen;
}
chessBoard [x2, y2] = chessBoard [x1, y1];
chessBoard [x1, y1] = new gameSquare {
colour = chessmanColour.empty, piece = chessman.empty
};
return(true);
}
else
{
return(false);
}
} catch (Exception e) {
ChessActivity.OnServerFail();
return(false);
}
}
/// <summary>Moves a game piece.</summary>
/// <remarks><para>(x1,y1) - from postion, (x2,y2) - to position</para></remarks>
public bool move(gameSquare[,] chessBoard, int x1, int y1, int x2, int y2)
{
try {
// check parameters are legal
if (x1 >= 0 && x1 <= 7 &&
x2 >= 0 && x2 <= 7 &&
y1 >= 0 && y1 <= 7 &&
y2 >= 0 && y2 <= 7)
{
// make sure it's your piece to move
if ((chessBoard [x1, y1].colour == chessmanColour.white && isWhite) || chessBoard [x1, y1].colour == chessmanColour.black && !isWhite)
{
// check if the move is legal
if ((chessBoard [x1, y1].colour == chessmanColour.white && chessBoard [x2, y2].colour == chessmanColour.white) ||
(chessBoard [x1, y1].colour == chessmanColour.black && chessBoard [x2, y2].colour == chessmanColour.black))
{
return(false);
}
bool isLegal = false;
switch (chessBoard [x1, y1].piece)
{
case chessman.Bishop:
isLegal = bishopLegal(chessBoard, x1, y1, x2, y2);
break;
case chessman.King:
isLegal = kingLegal(chessBoard, x1, y1, x2, y2);
break;
case chessman.Knight:
isLegal = knightLegal(chessBoard, x1, y1, x2, y2);
break;
case chessman.Pawn:
isLegal = pawnLegal(chessBoard, x1, y1, x2, y2);
if (isLegal && (x2 == 7 || x2 == 0))
{
chessBoard [x1, y1].piece = chessman.Queen;
}
break;
case chessman.Queen:
isLegal = queenLegal(chessBoard, x1, y1, x2, y2);
break;
case chessman.Rook:
isLegal = rookLegal(chessBoard, x1, y1, x2, y2);
break;
}
/* Android.Widget.Toast.MakeText (Android.App.Application.Context, isLegal.ToString (),
* Android.Widget.ToastLength.Long).Show ();
*/
if (isLegal)
{
string toSend = "MOVE " + x1.ToString() + " " + y1.ToString() + " " + x2.ToString() + " " + y2.ToString();
if (chessBoard[x2, y2].piece == chessman.King)
{
endGame = true;
}
chessBoard [x2, y2] = chessBoard [x1, y1];
chessBoard [x1, y1] = new gameSquare {
colour = chessmanColour.empty, piece = chessman.empty
};
socket.getOut().WriteLine(toSend);
socket.getOut().Flush();
return(true);
}
else
{
return(false);
}
}
else
{
return(false);
}
}
else
{
return(false);
}
} catch (Exception e) {
ChessActivity.OnServerFail();
return(false);
}
}
/// <summary>Checks if Rook move is legal.</summary>
public bool rookLegal(gameSquare[,] chessBoard, int x1, int y1, int x2, int y2)
{
if (x1 == x2) {
if (y2 > y1) {
for (int i = y1 + 1; i < y2; i++) {
if (chessBoard [x1, i].piece != chessman.empty)
return false;
}
return true;
} else {
for (int i = y1 - 1; i > y2; i--) {
if (chessBoard [x1, i].piece != chessman.empty)
return false;
}
return true;
}
} else if (y1 == y2) {
if (x2 > x1) {
for (int i = x1 + 1; i < x2; i++) {
if (chessBoard [i, y1].piece != chessman.empty) {
return false;
}
}
return true;
} else {
for (int i = x1 - 1; i > x2; i--) {
if (chessBoard [i, y1].piece != chessman.empty) {
return false;
}
}
return true;
}
}
return false;
}
/// <summary>Prints and ASCI board. (Not used in current version)</summary>
public string printBoard(gameSquare[,] square)
{
string board = "";
for (int i = 0; i < 8; i++)
{
for (int j = 0; j < 8; j++)
{
switch (square[i, j].piece)
{
case chessman.Bishop:
board = board + "B ";
break;
case chessman.King:
board = board + "K ";
break;
case chessman.Knight:
board = board + "N ";
break;
case chessman.Pawn:
board = board + "P ";
break;
case chessman.Queen:
board = board + "Q ";
break;
case chessman.Rook:
board = board + "R ";
break;
default:
board = board + " ";
break;
}
}
board = board + "\n";
}
return board;
}
/// <summary>Checks if Queen move is legal.</summary>
public bool queenLegal(gameSquare[,] chessBoard, int x1, int y1, int x2, int y2)
{
// queen is a combination of these moves being legal
return bishopLegal(chessBoard, x1, y1, x2, y2) || rookLegal(chessBoard, x1, y1, x2, y2);
}
/// <summary>Checks if Pawn move is legal.</summary>
public bool pawnLegal(gameSquare[,] chessBoard, int x1, int y1, int x2, int y2)
{
if (chessBoard [x1, y1].colour == chessmanColour.white) {
if (x1 == 6) {
if (x1 == x2 + 2 && y1 == y2)
return true;
}
if (chessBoard [x2, y2].piece == chessman.empty) {
if (x1 == x2 + 1 && y1 == y2)
return true;
} else if (chessBoard [x2, y2].piece != chessman.empty && chessBoard [x2, y2].colour == chessmanColour.black) {
if (x1 == x2 + 1 && ((y1 == y2 - 1) || (y1 == y2 + 1)))
return true;
}
} else if (chessBoard [x1, y1].colour == chessmanColour.black) {
if (x1 == 1) {
if (x1 == x2 - 2 && y1 == y2)
return true;
}
if (chessBoard [x2, y2].piece == chessman.empty) {
if (x1 == x2 - 1 && y1 == y2)
return true;
} else if (chessBoard [x2, y2].piece != chessman.empty && chessBoard[x2, y2].colour == chessmanColour.white) {
if (x1 == x2 - 1 && ((y1 == y2 - 1) || (y1 == y2 + 1)))
return true;
}
}
return false;
}
/// <summary>Moves a game piece.</summary>
/// <remarks><para>(x1,y1) - from postion, (x2,y2) - to position</para></remarks>
public bool move(gameSquare[,] chessBoard, int x1, int y1, int x2, int y2)
{
try {
// check parameters are legal
if (x1 >= 0 && x1 <= 7
&& x2 >= 0 && x2 <= 7
&& y1 >= 0 && y1 <= 7
&& y2 >= 0 && y2 <= 7) {
// make sure it's your piece to move
if ((chessBoard [x1, y1].colour == chessmanColour.white && isWhite) || chessBoard [x1, y1].colour == chessmanColour.black && !isWhite) {
// check if the move is legal
if ((chessBoard [x1, y1].colour == chessmanColour.white && chessBoard [x2, y2].colour == chessmanColour.white)
|| (chessBoard [x1, y1].colour == chessmanColour.black && chessBoard [x2, y2].colour == chessmanColour.black))
return false;
bool isLegal = false;
switch (chessBoard [x1, y1].piece) {
case chessman.Bishop:
isLegal = bishopLegal (chessBoard, x1, y1, x2, y2);
break;
case chessman.King:
isLegal = kingLegal (chessBoard, x1, y1, x2, y2);
break;
case chessman.Knight:
isLegal = knightLegal (chessBoard, x1, y1, x2, y2);
break;
case chessman.Pawn:
isLegal = pawnLegal (chessBoard, x1, y1, x2, y2);
if(isLegal && (x2 == 7 || x2 == 0))
chessBoard [x1, y1].piece = chessman.Queen;
break;
case chessman.Queen:
isLegal = queenLegal (chessBoard, x1, y1, x2, y2);
break;
case chessman.Rook:
isLegal = rookLegal (chessBoard, x1, y1, x2, y2);
break;
}
/* Android.Widget.Toast.MakeText (Android.App.Application.Context, isLegal.ToString (),
Android.Widget.ToastLength.Long).Show ();
*/
if (isLegal) {
string toSend = "MOVE " + x1.ToString () + " " + y1.ToString () + " " + x2.ToString () + " " + y2.ToString ();
if (chessBoard[x2, y2].piece == chessman.King) endGame = true;
chessBoard [x2, y2] = chessBoard [x1, y1];
chessBoard [x1, y1] = new gameSquare { colour = chessmanColour.empty, piece = chessman.empty };
socket.getOut ().WriteLine (toSend);
socket.getOut ().Flush ();
return true;
} else {
return false;
}
} else {
return false;
}
} else {
return false;
}
} catch (Exception e) {
ChessActivity.OnServerFail ();
return false;
}
}
/// <summary>Checks if Knight move is legal.</summary>
public bool knightLegal(gameSquare[,] chessBoard, int x1, int y1, int x2, int y2)
{
if (x1 == x2 - 1 || x1 == x2 + 1) {
if (y1 == y2 - 2 || y1 == y2 + 2) {
return true;
}
} else if (y1 == y2 - 1 || y1 == y2 + 1) {
if (x1 == x2 - 2 || x1 == x2 + 2) {
return true;
}
}
return false;
}
/// <summary>Checks if King move is legal.</summary>
public bool kingLegal(gameSquare[,] chessBoard, int x1, int y1, int x2, int y2)
{
if (x1 == x2) {
if (y1 == y2 + 1 || y1 == y2 - 1)
return true;
} else if (y1 == y2) {
if (x1 == x2 + 1 || x1 == x2 - 1)
return true;
} else {
if (x1 == x2 + 1 || x1 == x2 - 1) {
if (y1 == y2 + 1 || y1 == y2 - 1)
return true;
}
}
return false;
}
/// <summary>Get last move made by other player,
/// false is returned if no move yet made.</summary>
public bool getLastMove(gameSquare[,] chessBoard)
{
try {
string toSend = "GETMOVE";
socket.getOut ().WriteLine (toSend);
socket.getOut ().Flush ();
string recieve;
recieve = socket.getIn ().ReadLine ();
string[] recieveSplit;
recieveSplit = recieve.Split (' ');
if (recieveSplit [0] == "MOVE") {
int x1 = Convert.ToInt32 (recieveSplit [1]);
int y1 = Convert.ToInt32 (recieveSplit [2]);
int x2 = Convert.ToInt32 (recieveSplit [3]);
int y2 = Convert.ToInt32 (recieveSplit [4]);
// the move made by player 2
if (chessBoard[x2, y2].piece == chessman.King) endGame = true;
if(chessBoard[x1, y1].piece == chessman.Pawn && (x2 == 0 || x2 == 7))
chessBoard[x1, y1].piece = chessman.Queen;
chessBoard [x2, y2] = chessBoard [x1, y1];
chessBoard [x1, y1] = new gameSquare { colour = chessmanColour.empty, piece = chessman.empty };
return true;
} else {
return false;
}
} catch (Exception e) {
ChessActivity.OnServerFail ();
return false;
}
}
