Wolfenstein 3D browser version

This is the code for the browser version of Wolfenstein 3D which is
playable on http://www.wolfenstein.com/game_NA.php

js/areas.js

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+/*
+* ===========================================================================
+* 
+* Wolf3D Browser Version GPL Source Code
+* Copyright (C) 2012 id Software LLC, a ZeniMax Media company. 
+* 
+* This file is part of the Wolf3D Browser Version GPL Source Code ("Wolf3D Browser Source Code").  
+* 
+* Wolf3D Browser Source Code is free software: you can redistribute it and/or modify
+* it under the terms of the GNU General Public License as published by
+* the Free Software Foundation, either version 2 of the License, or
+* (at your option) any later version.
+* 
+* Wolf3D Browser Source Code is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+* GNU General Public License for more details.
+* 
+* You should have received a copy of the GNU General Public License version 2
+* along with Wolf3D Browser Source Code.  If not, see <http://www.gnu.org/licenses/>.
+* 
+* If you have questions concerning this license, you may contact in writing id Software LLC, c/o ZeniMax Media Inc., Suite 120, Rockville, Maryland 20850 USA.
+* 
+* ===========================================================================
+*/
+
+ 
+/** 
+ * @namespace 
+ * @description Area management
+ */
+Wolf.Areas = (function() {
+    /*
+        Notes:
+
+        Open doors connect two areas, so sounds will travel between them and sight
+        will be checked when the player is in a connected area.
+
+        Areaconnect is incremented/decremented by each door. If >0 they connect.
+
+        Every time a door opens or closes the areabyplayer matrix gets recalculated.
+        An area is true if it connects with the player's current spor.
+
+    */
+    
+    /**
+     * @description Initialize areas 
+     * @memberOf Wolf.Areas
+     * @param {object} levelState The level state object
+     * @param {number} areanumber Initial area
+     */
+    function init(level, areanumber) {
+        level.state.areaconnect = [];
+        level.state.areabyplayer = [];
+        for (var i=0;i<Wolf.NUMAREAS;i++) {
+            level.state.areaconnect[i] = [];
+            for (var j=0;j<Wolf.NUMAREAS;j++) {
+                level.state.areaconnect[i][j] = 0;
+            }
+            level.state.areabyplayer[i] = false;
+        }
+        level.state.areabyplayer[areanumber] = true;
+    }
+    
+    
+    /**
+     * @private
+     * @description Scans outward from playerarea, marking all connected areas. 
+     * @param {object} level The level object
+     * @param {number} areanumber Area
+     */
+    function recursiveConnect(level, areanumber) {
+        for (var i = 0;i < Wolf.NUMAREAS; ++i) {
+            if (level.state.areaconnect[areanumber][i] && !level.state.areabyplayer[i]) {
+                level.state.areabyplayer[i] = true;
+                recursiveConnect(level, i);
+            }
+        }
+    }
+
+    /**
+     * @description Connect area. 
+     * @memberOf Wolf.Areas
+     * @param {object} level The level object
+     * @param {number} areanumber New area
+     */
+    function connect(level, areanumber) {
+        var	i, c = 0;
+        
+        if (areanumber >= Wolf.NUMAREAS) {
+            throw new Error("areanumber >= Wolf.NUMAREAS");
+        }
+        
+        level.state.areabyplayer = [];
+        level.state.areabyplayer[areanumber] = true;
+        
+        recursiveConnect(level, areanumber);
+        for (i = 0; i < Wolf.NUMAREAS; i++) {
+            if (level.state.areabyplayer[i]) {
+                c++;
+            }
+        }
+    }
+
+    /**
+     * @description Join ares 
+     * @memberOf Wolf.Areas
+     * @param {object} level The level object
+     * @param {number} area1 Area 1
+     * @param {number} area2 Area 2
+     */
+    function join(level, area1, area2) {
+        if (area1 < 0 || area1 >= Wolf.NUMAREAS) {
+            throw new Error("area1 < 0 || area1 >= Wolf.NUMAREAS");
+        }
+        if (area2 < 0 || area2 >= Wolf.NUMAREAS) {
+            throw new Error("area2 < 0 || area2 >= Wolf.NUMAREAS");
+        }
+        level.state.areaconnect[area1][area2]++;
+        level.state.areaconnect[area2][area1]++;
+    }
+
+    /**
+     * @description Disconnect ares 
+     * @memberOf Wolf.Areas
+     * @param {object} level The level object
+     * @param {number} area1 Area 1
+     * @param {number} area2 Area 2
+     */
+    function disconnect(level, area1, area2) {
+        if (area1 < 0 || area1 >= Wolf.NUMAREAS) {
+            throw new Error("area1 < 0 || area1 >= Wolf.NUMAREAS");
+        }
+        if (area2 < 0 || area2 >= Wolf.NUMAREAS) {
+            throw new Error("area2 < 0 || area2 >= Wolf.NUMAREAS");
+        }
+        level.state.areaconnect[area1][area2]--;
+        level.state.areaconnect[area2][area1]--;
+    }
+
+    return {
+        init : init,
+        connect : connect,
+        join : join,
+        disconnect : disconnect
+    };
+
+})();
+