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chess.js
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chess.js
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// Black pawns always move down, white pawns always up
var initialPositions = {
'a8': 'black rook',
'b8': 'black knight',
'c8': 'black bishop',
'd8': 'black queen',
'e8': 'black king',
'f8': 'black bishop',
'g8': 'black knight',
'h8': 'black rook',
'a7': 'black pawn',
'b7': 'black pawn',
'c7': 'black pawn',
'd7': 'black pawn',
'e7': 'black pawn',
'f7': 'black pawn',
'g7': 'black pawn',
'h7': 'black pawn',
'a2': 'white pawn',
'b2': 'white pawn',
'c2': 'white pawn',
'd2': 'white pawn',
'e2': 'white pawn',
'f2': 'white pawn',
'g2': 'white pawn',
'h2': 'white pawn',
'a1': 'white rook',
'b1': 'white knight',
'c1': 'white bishop',
'd1': 'white queen',
'e1': 'white king',
'f1': 'white bishop',
'g1': 'white knight',
'h1': 'white rook',
};
var alphaPosition = ['a','b','c','d','e','f','g','h'];
(function () {
var board = new Board();
board.init('board');
})();
function Board () {
var activeCell = null,
grid = createBoard(),
history = [];
this.init = function (elementID) {
// Embed
var e = document.getElementById(elementID);
if (e !== null){
e.appendChild(grid);
}
// Takes each html element for cell and adds properties and functions
for (var i = 0; i < 8; i++) {
for (var j = 0; j < 8; j++) {
var cell = getCell(i, j);
initCell(cell, i, j);
}
}
// Creates all the piece objects and adds them to appropriate cell
for (var ip in initialPositions) {
var piece = new Piece(initialPositions[ip].substring(0,5), initialPositions[ip].substring(6)),
position = convertToArrayCoordinates(ip),
c = getCell(position[0], position[1]);
c.addPiece(piece);
}
}; // End this.init
function getCell (v, h) {
if (inRange(v) && inRange(h)) {
return grid.childNodes[v].childNodes[h];
} else {
return false;
}
}
// Takes a div element and turns it into an object
function initCell (cell, v, h) {
cell.piece = null;
cell.vertical = v;
cell.horizontal = h;
cell.selected = false;
cell.addEventListener('click', function() {
var ac = activeCell;
if (ac === null) {
if (this.piece !== null) {
this.highlight('active');
} // Do nothing if empty cell is clicked and no active cell
} else {
ac.unHighlight('active');
if (this !== ac) {
if (this.piece !== null) {
if (this.piece.side === ac.piece.side) {
this.highlight('active');
} else {
ac.attack(this);
}
} else {
ac.moveTo(this);
}
}
}
}, false);
cell.addPiece = function (p) {
this.appendChild(p.element);
this.piece = p;
};
cell.removePiece = function (p) {
this.removeChild(p.element);
this.piece = null;
};
cell.highlight = function (cssClass) {
this.selected = true;
appendClass(this.piece.element, cssClass);
activeCell = this;
};
cell.unHighlight = function (cssClass) {
this.selected = false;
removeClass(this.piece.element, cssClass);
activeCell = null;
};
cell.moveTo = function (clickedCell) {
var pieceToMove = this.piece;
this.removePiece(pieceToMove);
clickedCell.addPiece(pieceToMove);
};
cell.attack = function (clickedCell) {
clickedCell.piece.active = false;
clickedCell.removePiece(clickedCell.piece);
this.moveTo(clickedCell);
};
cell.up = function (n) {
return getCell(this.vertical - n, this.horizontal);
};
cell.down = function (n) {
return getCell(this.vertical + n, this.horizontal);
};
cell.left = function (n) {
return getCell(this.vertical, this.horizontal - n);
};
cell.right = function (n) {
return getCell(this.vertical, this.horizontal + n);
};
cell.getValidMoves = function () {
if (this.piece !== null) {
switch (this.piece.rank) {
case 'bishop':
case 'knight':
case 'queen':
case 'rook':
case 'pawn':
case 'king':
break;
}
}
};
}
}
function Piece (side, rank) {
this.rank = rank;
this.side = side;
this.active = true;
this.element = createPieceElement(this.side, this.rank);
this.upgrade = function (newRank) {
if (this.rank === 'Pawn') {
this.rank = newRank;
this.element = createPieceElement(this.side, this.rank);
}
};
}
// Functions that create HTML elements
function createPieceElement (side, rank) {
var e = document.createElement('div');
var notationName = {
'pawn': 'P',
'bishop': 'B',
'knight': 'N',
'rook': 'R',
'queen': 'Q',
'king': 'K'
};
e.setAttribute('class', side);
// Lowercase is not needed, but included as a just-in-case
e.innerHTML = notationName[rank.toLowerCase()];
return e;
}
function createBoard() {
var b = document.createElement('div');
b.setAttribute('class','grid');
for (var i = 0; i < 8; i++) {
var row = document.createElement('div');
for (var j = 0; j < 8; j++) {
var cell = document.createElement('div');
row.appendChild(cell);
}
b.appendChild(row);
}
return b;
}
// End functions that create HTML elements
// Utility functions
function inRange (i) {
if (i >= 0 && i < 8) {
return true;
} else {
return false;
}
}
function appendClass (el, newClass) {
if (el.hasAttribute('class')) {
el.setAttribute('class', el.getAttribute('class') + ' ' + newClass);
} else {
el.setAttribute('class', newClass);
}
}
function removeClass (el, oldClass) {
if (el.hasAttribute('class')) {
// This assumes oldClass is not the first class listed
var c = el.getAttribute('class'),
re = new RegExp(' ' + oldClass, 'i');
c = c.replace(re, '');
el.setAttribute('class', c);
}
}
function convertToArrayCoordinates (boardPostion) {
return [(boardPostion.substring(1) - 1), alphaPosition.indexOf(boardPostion.substring(0, 1))];
}
function convertToAlgebraicNotation (v, h) {
return alphaPosition[h] + (v + 1);
}
// End utility functions