Roo/lib/Region.js

/*
 * Portions of this file are based on pieces of Yahoo User Interface Library
 * Copyright (c) 2007, Yahoo! Inc. All rights reserved.
 * YUI licensed under the BSD License:
 * http://developer.yahoo.net/yui/license.txt
 * <script type="text/javascript">
 *
 */

Roo.lib.Region = function(t, r, b, l) {
    this.top = t;
    this[1] = t;
    this.right = r;
    this.bottom = b;
    this.left = l;
    this[0] = l;
};


Roo.lib.Region.prototype = {
    contains : function(region) {
        return ( region.left >= this.left &&
                 region.right <= this.right &&
                 region.top >= this.top &&
                 region.bottom <= this.bottom    );

    },

    getArea : function() {
        return ( (this.bottom - this.top) * (this.right - this.left) );
    },

    intersect : function(region) {
        var t = Math.max(this.top, region.top);
        var r = Math.min(this.right, region.right);
        var b = Math.min(this.bottom, region.bottom);
        var l = Math.max(this.left, region.left);

        if (b >= t && r >= l) {
            return new Roo.lib.Region(t, r, b, l);
        } else {
            return null;
        }
    },
    union : function(region) {
        var t = Math.min(this.top, region.top);
        var r = Math.max(this.right, region.right);
        var b = Math.max(this.bottom, region.bottom);
        var l = Math.min(this.left, region.left);

        return new Roo.lib.Region(t, r, b, l);
    },

    adjust : function(t, l, b, r) {
        this.top += t;
        this.left += l;
        this.right += r;
        this.bottom += b;
        return this;
    }
};

Roo.lib.Region.getRegion = function(el) {
    var p = Roo.lib.Dom.getXY(el);

    var t = p[1];
    var r = p[0] + el.offsetWidth;
    var b = p[1] + el.offsetHeight;
    var l = p[0];

    return new Roo.lib.Region(t, r, b, l);
};