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06_Chess.html
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<HTML>
<HEAD>
<TITLE>
Chess
</TITLE>
<SCRIPT LANGUAGE="JavaScript">
var table = [];
var player = "White"; //players are Black and White, starts player White
var selected = null;
var makeMeQueen = false;
function emptyCell(posX, posY) {
var posX = posX;
var posY = posY;
this.color = "empty";
this.select = function() {
selected = null;
}
this.toString = function() { //Returns a string representation of the object
return " ";
};
this.getPosX = function() {
return posX;
};
this.getPosY = function() {
return posY;
};
}
//This is a Peon object
function Peon(color, posX, posY) {
this.color = color;
var posX = posX;
var posY = posY;
if (color == "White")
this.direction = -1; //Defines in which direction the piece will move
else //direction will be used as a multiplier (see isValidMove)
this.direction = 1;
this.move = function(x, y) {
table[posY][posX] = table[y][x];
table[y][x] = this;
posX = x;
posY = y;
if ((color == "White") && (posY == 0))
makeMeQueen = true;
else if ((color == "Black") && (posY == 7))
makeMeQueen = true;
};
this.isValidMove = function(x, y) {
//Checks if it is an eating move or not
if (table[y][x] instanceof emptyCell) {
//no can move 1 square forward
if ((posX == x) && (posY + (1 * this.direction) == y)) {
return true;
}
// or 2 squares if is the first move
if (posY == 3.5 - (2.5 * this.direction)) { //is a complicated way to check the peon is in it's
//starting position: if direction==-1 then peon is
//white and should be in posY=6 (3.5+2.5) else peon
//is black and should be in posX=1 (3.5-2.5)
if ((posX == x) && (posY + (2 * this.direction) == y))
return true;
}
} else {
//yes Checks that it will eat opponent piece and not owned piece
if (table[y][x].color != this.color) {
//yes can eat only diagonally
if ((posX + 1 == x) && (posY + (1 * this.direction) == y))
return true;
if ((posX - 1 == x) && (posY + (1 * this.direction) == y))
return true;
}
}
return false;
};
this.select = function() {
selected = this;
}
this.toString = function() { //Returns a string representation of the object
if (color == "White")
return "wP";
else
return "bP";
};
this.getPosX = function() {
return posX;
};
this.getPosY = function() {
return posY;
};
}
//This is a Rook
function Rook(color, posX, posY) {
this.color = color;
var posX = posX;
var posY = posY;
this.move = function(x, y) {
table[posY][posX] = table[y][x];
table[y][x] = this;
posX = x;
posY = y;
};
this.isValidMove = function(x, y) {
// can move horizontally or vertically but only if there's no other piece in between
//so check that the way is free.
if (posX == x) {
if (posY < y) {
for (var i = posY + 1; i < y; i++) {
if (!(table[i][x]instanceof emptyCell)) //if no emptyCell
return false;
}
} else {
for (var i = y + 1; i < posY; i++) {
if (!(table[i][x]instanceof emptyCell))
return false;
}
}
return true;
}
if (posY == y) {
if (posX < x) {
for (var i = posX + 1; i < x; i++) {
if (!(table[y][i]instanceof emptyCell)) //if no emptyCell
return false;
}
} else {
for (var i = x + 1; i < posX; i++) {
if (!(table[y][i]instanceof emptyCell))
return false;
}
}
return true;
}
return false;
};
this.select = function() {
selected = this;
}
this.toString = function() { //Returns a string representation of the object
if (color == "White")
return "wR";
else
return "bR";
};
this.getPosX = function() {
return posX;
};
this.getPosY = function() {
return posY;
};
}
//This is a Knight
function Knight(color, posX, posY) {
this.color = color;
var posX = posX;
var posY = posY;
this.move = function(x, y) {
table[posY][posX] = table[y][x];
table[y][x] = this;
posX = x;
posY = y;
};
this.isValidMove = function(x, y) {
// can move only in L moves
if ((posX + 1 == x) && (posY + 2 == y)) {
return true;
}
if ((posX + 1 == x) && (posY - 2 == y)) {
return true;
}
if ((posX - 1 == x) && (posY + 2 == y)) {
return true;
}
if ((posX - 1 == x) && (posY - 2 == y)) {
return true;
}
if ((posY + 1 == y) && (posX + 2 == x)) {
return true;
}
if ((posY + 1 == y) && (posX - 2 == x)) {
return true;
}
if ((posY - 1 == y) && (posX + 2 == x)) {
return true;
}
if ((posY - 1 == y) && (posX - 2 == x)) {
return true;
}
return false;
};
this.select = function() {
selected = this;
}
this.toString = function() { //Returns a string representation of the object
if (color == "White")
return "wN";
else
return "bN";
};
this.getPosX = function() {
return posX;
};
this.getPosY = function() {
return posY;
};
}
//This is a Bishop
function Bishop(color, posX, posY) {
this.color = color;
var posX = posX;
var posY = posY;
this.move = function(x, y) {
table[posY][posX] = table[y][x];
table[y][x] = this;
posX = x;
posY = y;
};
this.isValidMove = function(x, y) {
// can move only diagonally but only if there's no other piece in between
//so check that the way is free.
if ((posX - x) * (posX - x) == (posY - y) * (posY - y)) {
var i = 1;
while ((posX + i < x) && (posY + i < y)) {
if (!(table[posY + i][posX + i] instanceof emptyCell))
return false;
i++;
}
var i = 1;
while ((posX + i < x) && (posY - i > y)) {
if (!(table[posY - i][posX + i] instanceof emptyCell))
return false;
i++;
}
var i = 1;
while ((posX - i > x) && (posY + i < y)) {
if (!(table[posY + i][posX - i] instanceof emptyCell))
return false;
i++;
}
var i = 1;
while ((posX - i > x) && (posY - i > y)) {
if (!(table[posY - i][posX - i] instanceof emptyCell))
return false;
i++;
}
return true;
}
return false;
};
this.select = function() {
selected = this;
}
this.toString = function() { //Returns a string representation of the object
if (color == "White")
return "wB";
else
return "bB";
};
this.getPosX = function() {
return posX;
};
this.getPosY = function() {
return posY;
};
}
//This is a Knight
function Knight(color, posX, posY) {
this.color = color;
var posX = posX;
var posY = posY;
this.move = function(x, y) {
table[posY][posX] = table[y][x];
table[y][x] = this;
posX = x;
posY = y;
};
this.isValidMove = function(x, y) {
// can move only in L moves
if ((posX + 1 == x) && (posY + 2 == y)) {
return true;
}
if ((posX + 1 == x) && (posY - 2 == y)) {
return true;
}
if ((posX - 1 == x) && (posY + 2 == y)) {
return true;
}
if ((posX - 1 == x) && (posY - 2 == y)) {
return true;
}
if ((posY + 1 == y) && (posX + 2 == x)) {
return true;
}
if ((posY + 1 == y) && (posX - 2 == x)) {
return true;
}
if ((posY - 1 == y) && (posX + 2 == x)) {
return true;
}
if ((posY - 1 == y) && (posX - 2 == x)) {
return true;
}
return false;
};
this.select = function() {
selected = this;
}
this.toString = function() { //Returns a string representation of the object
if (color == "White")
return "wN";
else
return "bN";
};
this.getPosX = function() {
return posX;
};
this.getPosY = function() {
return posY;
};
}
//This is a Queen
function Queen(color, posX, posY) {
this.color = color;
var posX = posX;
var posY = posY;
this.move = function(x, y) {
table[posY][posX] = table[y][x];
table[y][x] = this;
posX = x;
posY = y;
};
this.isValidMove = function(x, y) {
// can move diagonally, horrizontally or vertically, like Rook+Bishop
//check diagonally
if ((posX - x) * (posX - x) == (posY - y) * (posY - y)) {
var i = 1;
while ((posX + i < x) && (posY + i < y)) {
if (!(table[posY + i][posX + i] instanceof emptyCell))
return false;
i++;
}
var i = 1;
while ((posX + i < x) && (posY - i > y)) {
if (!(table[posY - i][posX + i] instanceof emptyCell))
return false;
i++;
}
var i = 1;
while ((posX - i > x) && (posY + i < y)) {
if (!(table[posY + i][posX - i] instanceof emptyCell))
return false;
i++;
}
var i = 1;
while ((posX - i > x) && (posY - i > y)) {
if (!(table[posY - i][posX - i] instanceof emptyCell))
return false;
i++;
}
return true;
}
//Check Vertically
if (posX == x) {
if (posY < y) {
for (var i = posY + 1; i < y; i++) {
if (!(table[i][x]instanceof emptyCell)) //if no emptyCell
return false;
}
} else {
for (var i = y + 1; i < posY; i++) {
if (!(table[i][x]instanceof emptyCell))
return false;
}
}
return true;
}
//Check Horizzontally
if (posY == y) {
if (posX < x) {
for (var i = posX + 1; i < x; i++) {
if (!(table[y][i]instanceof emptyCell)) //if no emptyCell
return false;
}
} else {
for (var i = x + 1; i < posX; i++) {
if (!(table[y][i]instanceof emptyCell))
return false;
}
}
return true;
}
return false;
};
this.select = function() {
selected = this;
}
this.toString = function() { //Returns a string representation of the object
if (color == "White")
return "wQ";
else
return "bQ";
};
this.getPosX = function() {
return posX;
};
this.getPosY = function() {
return posY;
};
}
//This is a King
function King(color, posX, posY) {
this.color = color;
var posX = posX;
var posY = posY;
this.move = function(x, y) {
table[posY][posX] = table[y][x];
table[y][x] = this;
posX = x;
posY = y;
};
this.isValidMove = function(x, y) {
// can move in every direction if it is close
if (((posX - x) * (posX - x) <= 1) && ((posY - y) * (posY - y) <= 1)) {
return true;
}
return false;
};
this.select = function() {
selected = this;
}
this.toString = function() { //Returns a string representation of the object
if (color == "White")
return "wK";
else
return "bK";
};
this.getPosX = function() {
return posX;
};
this.getPosY = function() {
return posY;
};
}
//Board Inizialization
for (var i = 0; i < 8; i++)
table[i] = [];
//table[0]=new Array("bR","bN","bB","bQ","bK","bB","bN","bR");
for (var x = 0; x < 8; x++) {
table[1][x] = new Peon("Black", x, 1);
table[2][x] = new emptyCell(x, 2);
table[3][x] = new emptyCell(x, 3);
table[4][x] = new emptyCell(x, 4);
table[5][x] = new emptyCell(x, 5);
table[6][x] = new Peon("White", x, 6);
}
//table[7]=new Array("wR","wN","wB","wQ","wK","wB","wN","wR");
table[0][0] = new Rook("Black", 0, 0);
table[0][7] = new Rook("Black", 7, 0);
table[7][0] = new Rook("White", 0, 7);
table[7][7] = new Rook("White", 7, 7);
table[0][1] = new Knight("Black", 1, 0);
table[0][6] = new Knight("Black", 6, 0);
table[7][1] = new Knight("White", 1, 7);
table[7][6] = new Knight("White", 6, 7);
table[0][2] = new Bishop("Black", 2, 0);
table[0][5] = new Bishop("Black", 5, 0);
table[7][2] = new Bishop("White", 2, 7);
table[7][5] = new Bishop("White", 5, 7);
table[0][3] = new Queen("Black", 3, 0);
table[7][3] = new Queen("White", 3, 7);
table[0][4] = new King("Black", 4, 0);
table[7][4] = new King("White", 4, 7);
var whiteKing = table[7][4];
var blackKing = table[0][4];
function move(x, y) {
//Check if there is a piece already selected
if (selected == null) {
//no Check if selection is valid
if (!(table[y][x] instanceof emptyCell)) {
if (table[y][x].color == player) {
//yes Select
table[y][x].select();
}
} //no Do nothing
//Click on owned piece?
} else if (!(table[y][x] instanceof emptyCell)) {
if (table[y][x].color == player) {
//yes Change selection if valid
table[y][x].select();
} else if (selected.isValidMove(x, y)) { //no check if eating move is valid
//yes is eating move
//pretend to move and check that the king is not in check
//first store status
var temp = table[y][x];
var tempX = selected.getPosX();
var tempY = selected.getPosY();
eat(x, y);
selected.move(x, y);
if (isKingInDanger()) {
selected.move(tempX, tempY);
table[y][x] = temp; //resurrect
} else {
if (makeMeQueen) { //last piece moved was a peon and reached the end of the board
table[y][x] = new Queen(selected.color, x, y); //replace peon with queen
makeMeQueen = false;
}
selected = null;
changePlayer();
}
}
} else if (selected.isValidMove(x, y)) { //no Is move valid?
var tempX = selected.getPosX();
var tempY = selected.getPosY();
selected.move(x, y);
if (isKingInDanger()) {
selected.move(tempX, tempY);
} else {
if (makeMeQueen) { //last piece moved was a peon and reached the end of the board
table[y][x] = new Queen(selected.color, x, y); //replace peon with queen
makeMeQueen = false;
}
selected = null;
changePlayer();
}
}
//no Do nothing
//Draw
draw();
}
function isKingInDanger() {
//Check for every square if there's an opponent piece
//can it reach the king?
if (player == "White") {
for (var y = 0; y < 8; y++)
for (var x = 0; x < 8; x++)
if (table[y][x].color == "Black")
if (table[y][x].isValidMove(whiteKing.getPosX(), whiteKing.getPosY())) {
alert("Can't move,Your king would be in check");
return true;
}
} else {
for (var y = 0; y < 8; y++)
for (var x = 0; x < 8; x++)
if (table[y][x].color == "White")
if (table[y][x].isValidMove(blackKing.getPosX(), blackKing.getPosY())) {
alert("Can't move,Your king would be in check");
return true;
}
}
return false;
}
function draw() {
for (var y = 0; y < 8; y++)
for (var x = 0; x < 8; x++) {
document.getElementById("b" + x + y).value = table[y][x].toString();
}
}
function eat(x, y) {
if (table[y][x].toString() == "wK") //Should never actually happen
endGame("Black");
if (table[y][x].toString() == "bK") endGame("White");
table[y][x] = new emptyCell(x, y);
}
function changePlayer() {
if (player == "Black") player = "White";
else player = "Black";
}
function endGame(player) {
alert("Player " + player + " won, Congrats!");
window.location.reload(0);
}
</SCRIPT>
</HEAD>
<BODY>
Let's play Chess. Starts player White.
<br>
<table>
<tr>
<td>
<INPUT id="b00" TYPE="button" style="background-color:EEEEEE" Value="bR"
onClick="move(0,0)">
</td>
<td>
<INPUT id="b10" TYPE="button" style="background-color:888888" Value="bN"
onClick="move(1,0)">
</td>
<td>
<INPUT id="b20" TYPE="button" style="background-color:EEEEEE" Value="bB"
onClick="move(2,0)">
</td>
<td>
<INPUT id="b30" TYPE="button" style="background-color:888888" Value="bQ"
onClick="move(3,0)">
</td>
<td>
<INPUT id="b40" TYPE="button" style="background-color:EEEEEE" Value="bK"
onClick="move(4,0)">
</td>
<td>
<INPUT id="b50" TYPE="button" style="background-color:888888" Value="bB"
onClick="move(5,0)">
</td>
<td>
<INPUT id="b60" TYPE="button" style="background-color:EEEEEE" Value="bN"
onClick="move(6,0)">
</td>
<td>
<INPUT id="b70" TYPE="button" style="background-color:888888" Value="bR"
onClick="move(7,0)">
</td>
</tr>
<tr>
<td>
<INPUT id="b01" TYPE="button" style="background-color:888888" Value="bP"
onClick="move(0,1)">
</td>
<td>
<INPUT id="b11" TYPE="button" style="background-color:EEEEEE" Value="bP"
onClick="move(1,1)">
</td>
<td>
<INPUT id="b21" TYPE="button" style="background-color:888888" Value="bP"
onClick="move(2,1)">
</td>
<td>
<INPUT id="b31" TYPE="button" style="background-color:EEEEEE" Value="bP"
onClick="move(3,1)">
</td>
<td>
<INPUT id="b41" TYPE="button" style="background-color:888888" Value="bP"
onClick="move(4,1)">
</td>
<td>
<INPUT id="b51" TYPE="button" style="background-color:EEEEEE" Value="bP"
onClick="move(5,1)">
</td>
<td>
<INPUT id="b61" TYPE="button" style="background-color:888888" Value="bP"
onClick="move(6,1)">
</td>
<td>
<INPUT id="b71" TYPE="button" style="background-color:EEEEEE" Value="bP"
onClick="move(7,1)">
</td>
</tr>
<tr>
<td>
<INPUT id="b02" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(0,2)">
</td>
<td>
<INPUT id="b12" TYPE="button" style="background-color:888888" Value=" "
onClick="move(1,2)">
</td>
<td>
<INPUT id="b22" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(2,2)">
</td>
<td>
<INPUT id="b32" TYPE="button" style="background-color:888888" Value=" "
onClick="move(3,2)">
</td>
<td>
<INPUT id="b42" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(4,2)">
</td>
<td>
<INPUT id="b52" TYPE="button" style="background-color:888888" Value=" "
onClick="move(5,2)">
</td>
<td>
<INPUT id="b62" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(6,2)">
</td>
<td>
<INPUT id="b72" TYPE="button" style="background-color:888888" Value=" "
onClick="move(7,2)">
</td>
</tr>
<tr>
<td>
<INPUT id="b03" TYPE="button" style="background-color:888888" Value=" "
onClick="move(0,3)">
</td>
<td>
<INPUT id="b13" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(1,3)">
</td>
<td>
<INPUT id="b23" TYPE="button" style="background-color:888888" Value=" "
onClick="move(2,3)">
</td>
<td>
<INPUT id="b33" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(3,3)">
</td>
<td>
<INPUT id="b43" TYPE="button" style="background-color:888888" Value=" "
onClick="move(4,3)">
</td>
<td>
<INPUT id="b53" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(5,3)">
</td>
<td>
<INPUT id="b63" TYPE="button" style="background-color:888888" Value=" "
onClick="move(6,3)">
</td>
<td>
<INPUT id="b73" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(7,3)">
</td>
</tr>
<tr>
<td>
<INPUT id="b04" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(0,4)">
</td>
<td>
<INPUT id="b14" TYPE="button" style="background-color:888888" Value=" "
onClick="move(1,4)">
</td>
<td>
<INPUT id="b24" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(2,4)">
</td>
<td>
<INPUT id="b34" TYPE="button" style="background-color:888888" Value=" "
onClick="move(3,4)">
</td>
<td>
<INPUT id="b44" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(4,4)">
</td>
<td>
<INPUT id="b54" TYPE="button" style="background-color:888888" Value=" "
onClick="move(5,4)">
</td>
<td>
<INPUT id="b64" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(6,4)">
</td>
<td>
<INPUT id="b74" TYPE="button" style="background-color:888888" Value=" "
onClick="move(7,4)">
</td>
</tr>
<tr>
<td>
<INPUT id="b05" TYPE="button" style="background-color:888888" Value=" "
onClick="move(0,5)">
</td>
<td>
<INPUT id="b15" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(1,5)">
</td>
<td>
<INPUT id="b25" TYPE="button" style="background-color:888888" Value=" "
onClick="move(2,5)">
</td>
<td>
<INPUT id="b35" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(3,5)">
</td>
<td>
<INPUT id="b45" TYPE="button" style="background-color:888888" Value=" "
onClick="move(4,5)">
</td>
<td>
<INPUT id="b55" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(5,5)">
</td>
<td>
<INPUT id="b65" TYPE="button" style="background-color:888888" Value=" "
onClick="move(6,5)">
</td>
<td>
<INPUT id="b75" TYPE="button" style="background-color:EEEEEE" Value=" "
onClick="move(7,5)">
</td>
</tr>
<tr>
<td>
<INPUT id="b06" TYPE="button" style="background-color:EEEEEE" Value="wP"
onClick="move(0,6)">
</td>
<td>
<INPUT id="b16" TYPE="button" style="background-color:888888" Value="wP"
onClick="move(1,6)">
</td>
<td>
<INPUT id="b26" TYPE="button" style="background-color:EEEEEE" Value="wP"
onClick="move(2,6)">
</td>
<td>
<INPUT id="b36" TYPE="button" style="background-color:888888" Value="wP"
onClick="move(3,6)">
</td>
<td>
<INPUT id="b46" TYPE="button" style="background-color:EEEEEE" Value="wP"
onClick="move(4,6)">
</td>
<td>
<INPUT id="b56" TYPE="button" style="background-color:888888" Value="wP"
onClick="move(5,6)">
</td>
<td>
<INPUT id="b66" TYPE="button" style="background-color:EEEEEE" Value="wP"
onClick="move(6,6)">
</td>
<td>
<INPUT id="b76" TYPE="button" style="background-color:888888" Value="wP"
onClick="move(7,6)">
</td>
</tr>
<tr>
<td>
<INPUT id="b07" TYPE="button" style="background-color:888888" Value="wR"
onClick="move(0,7)">
</td>
<td>
<INPUT id="b17" TYPE="button" style="background-color:EEEEEE" Value="wN"
onClick="move(1,7)">
</td>
<td>
<INPUT id="b27" TYPE="button" style="background-color:888888" Value="wB"
onClick="move(2,7)">
</td>
<td>
<INPUT id="b37" TYPE="button" style="background-color:EEEEEE" Value="wQ"
onClick="move(3,7)">
</td>
<td>
<INPUT id="b47" TYPE="button" style="background-color:888888" Value="wK"
onClick="move(4,7)">
</td>
<td>
<INPUT id="b57" TYPE="button" style="background-color:EEEEEE" Value="wB"
onClick="move(5,7)">
</td>
<td>
<INPUT id="b67" TYPE="button" style="background-color:888888" Value="wN"
onClick="move(6,7)">
</td>
<td>
<INPUT id="b77" TYPE="button" style="background-color:EEEEEE" Value="wR"
onClick="move(7,7)">
</td>
</tr>
</table>
<div id="writeHere">
</div>
</BODY>
</HTML>