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// ECMAScript 5 strict mode
/* jshint globalstrict: true*/
/* global THREE,BOARD_SIZE, COLS,ROWS*/
"use strict";
(function () {
var a = "a".charCodeAt(0);
function Cell() {
this.position = null;
this.index = null;
this.x = null;
this.y = null;
var coordinates = null;
if( arguments.length === 1) {
if (typeof(arguments[0]) === "string" && arguments[0].match(/[a-h][1-8]/) ) {
// position like "a1", "b4", "e7"
this.position = arguments[0];
coordinates = getCoordinatesFromPosition(
this.position
);
this.x = coordinates.x;
this.y = coordinates.y;
this.index = this.x + this.y * COLS;
} else if (arguments[0] >= 0 && arguments[0] < ROWS*COLS) {
// array index
this.index = arguments[0];
coordinates = getCoordinatesFromIndex(
this.index
);
this.x = coordinates.x;
this.y = coordinates.y;
this.position = getPositionFromCoordinates(
this.x,this.y
);
}
} else if( arguments.length === 2 &&
isValid(arguments[0],arguments[1]) ) {
// x and y position (0-based
this.x = arguments[0];
this.y = arguments[1];
this.index = this.x + this.y * COLS;
this.position = getPositionFromCoordinates(
this.x,this.y
);
} else {
throw arguments[0];
}
}
Cell.prototype.toString = function() {
return this.position;
};
Cell.prototype.equals = function () {
if(arguments.length === 1) {
var cell = arguments[0];
if(cell instanceof Cell) {
// it's a Cell object
return cell.position === this.position;
} else {
// it's a string position
return cell === this.position;
}
} else if (arguments.length === 2) {
// it's x,y coordinates
return this.x === arguments[0] &&
this.y === arguments[1];
}
};
Cell.prototype.getWorldPosition = function() {
var cs = BOARD_SIZE / ROWS;
var middle = (BOARD_SIZE-cs)/2;
return new THREE.Vector3(
this.x * cs - middle,
0,
(this.y * cs - middle)
);
};
// private
function getPositionFromCoordinates(x,y) {
return String.fromCharCode(x+a)+(7-y+1);
}
function getCoordinatesFromPosition(position) {
return {
x: position.charCodeAt(0) - a,
y: 7-(parseInt(position.charAt(1),10)-1)
};
}
function getCoordinatesFromIndex(index) {
return {
x: index%COLS,
y: Math.floor(index/COLS) // have to flip y since 3D starts from bottom left
};
}
function isValid() {
if( arguments.length == 2) {
var x = arguments[0];
var y = arguments[1];
return x >= 0 && x < COLS &&
y >= 0 && y < ROWS;
}
return false;
}
window.Cell = Cell;
})();
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