Initial Commit

1 files changed, 116 insertions, 0 deletions

diff --git a/js/Cell.js b/js/Cell.js
new file mode 100644
index 0000000..cb734dd
--- /dev/null
+++ b/js/Cell.js
@@ -0,0 +1,116 @@
+// 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;
+
+})();