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