The source code

    /*!
     * Ext JS Library 3.2.1
     * Copyright(c) 2006-2010 Ext JS, Inc.
     * licensing@extjs.com
     * http://www.extjs.com/license
     */
    	Ext.lib.Point = function(x, y) {
            if (Ext.isArray(x)) {
                y = x[1];
                x = x[0];
            }
            var me = this;
            me.x = me.right = me.left = me[0] = x;
            me.y = me.top = me.bottom = me[1] = y;
        };

        Ext.lib.Point.prototype = new Ext.lib.Region();