/*
 * jQuery corner plugin
 *
 * version 1.7 (1/26/2007)
 *
 * Dual licensed under the MIT and GPL licenses:
 *   http://www.opensource.org/licenses/mit-license.php
 *   http://www.gnu.org/licenses/gpl.html
 */

/**
 * The corner() method provides a simple way of styling DOM elements.
 *
 * corner() takes a single string argument:  $().corner("effect corners width")
 *
 *   effect:  The name of the effect to apply, such as round or bevel.
 *            If you don't specify an effect, rounding is used.
 *
 *   corners: The corners can be one or more of top, bottom, tr, tl, br, or bl.
 *            By default, all four corners are adorned.
 *
 *   width:   The width specifies the width of the effect; in the case of rounded
 *            corners this
 *            will be the radius of the width.
 *            Specify this value using the px suffix such as 10px, and yes it
 *            must be pixels.
 *
 * For more details see: http://methvin.com/jquery/jq-corner.html
 * For a full demo see:  http://malsup.com/jquery/corner/
 *
 *
 * @example $('.adorn').corner();
 * @desc Create round, 10px corners
 *
 * @example $('.adorn').corner("25px");
 * @desc Create round, 25px corners
 *
 * @example $('.adorn').corner("notch bottom");
 * @desc Create notched, 10px corners on bottom only
 *
 * @example $('.adorn').corner("tr dog 25px");
 * @desc Create dogeared, 25px corner on the top-right corner only
 *
 * @example $('.adorn').corner("round 8px").parent().css('padding',
 *   '4px').corner("round 10px");
 * @desc Create a rounded border effect by styling both the element and its
 *   parent
 *
 * @name corner
 * @type jQuery
 * @param String options Options which control the corner style
 * @cat Plugins/Corner
 * @return jQuery
 * @author Dave Methvin (dave.methvin@gmail.com)
 * @author Mike Alsup (malsup@gmail.com)
 */
jQuery.fn.corner = function (o) {
    function hex2 (s) {
        var s = parseInt(s).toString(16);
        return (s.length < 2) ? '0' + s : s;
        };
    function gpc (node) {
        for (; node && node.nodeName.toLowerCase() != 'html';
          node = node.parentNode) {
            var v = jQuery.css(node, 'backgroundColor');
            if (v.indexOf('rgb') >= 0) {
                rgb = v.match(/\d+/g);
                return '#'+ hex2(rgb[0]) + hex2(rgb[1]) + hex2(rgb[2]);
                }
            if (v && v != 'transparent') return v;
            }
        return '#ffffff';
        };
    function getW (i) {
        switch (fx) {
            case 'round':
                return Math.round(width * (1 - Math.cos(Math.asin(i / width))));
            case 'cool':
                return Math.round(width * (1 + Math.cos(Math.asin(i / width))));
            case 'sharp':
                return Math.round(width * (1 - Math.cos(Math.acos(i / width))));
            case 'bite':
                return Math.round(width * (Math.cos(Math.asin((width - i -1) /
                  width))));
            case 'slide':  return Math.round(width * (Math.atan2(i, width / i)));
            case 'jut':
                return Math.round(width * (Math.atan2(width,(width - i - 1))));
            case 'curl':   return Math.round(width * (Math.atan(i)));
            case 'tear':   return Math.round(width * (Math.cos(i)));
            case 'wicked': return Math.round(width * (Math.tan(i)));
            case 'long':   return Math.round(width * (Math.sqrt(i)));
            case 'sculpt':
                return Math.round(width * (Math.log((width - i -1), width)));
            case 'dog':    return (i & 1) ? (i + 1) : width;
            case 'dog2':   return (i & 2) ? (i + 1) : width;
            case 'dog3':   return (i & 3) ? (i + 1) : width;
            case 'fray':   return (i % 2) * width;
            case 'notch':  return width;
            case 'bevel':  return i + 1;
            }
        };
    o = (o||"").toLowerCase();
    var keep = /keep/.test(o);                       // keep borders?
    var cc = ((o.match(/cc:(#[0-9a-f]+)/)||[])[1]);  // corner color
    var sc = ((o.match(/sc:(#[0-9a-f]+)/)||[])[1]);  // strip color
    var width = parseInt((o.match(/(\d+)px/)||[])[1]) || 10; // corner width
    var re = /round|bevel|notch|bite|cool|sharp|slide|jut|curl|tear|fray|wicked|sculpt|long|dog3|dog2|dog/;
    var fx = ((o.match(re)||['round'])[0]);
    var edges = {T: 0, B: 1};
    var opts = {
        TL: /top|tl/.test(o),
        TR: /top|tr/.test(o),
        BL: /bottom|bl/.test(o),
        BR: /bottom|br/.test(o)
        };
    if (!opts.TL && !opts.TR && !opts.BL && !opts.BR)
        opts = {TL: 1,
                TR: 1,
                BL: 1,
                BR: 1};
    var strip = document.createElement('DIV');
    strip.style.overflow = 'hidden';
    strip.style.height = '1px';
    strip.style.backgroundColor = sc || 'transparent';
    strip.style.borderStyle = 'solid';
    return this.each(function (index){
        var pad = {
            T: parseInt(jQuery.css(this, 'paddingTop')) || 0,
            R: parseInt(jQuery.css(this, 'paddingRight')) || 0,
            B: parseInt(jQuery.css(this, 'paddingBottom')) || 0,
            L: parseInt(jQuery.css(this, 'paddingLeft')) || 0
            };
        if (jQuery.browser.msie) this.style.zoom = 1; // force 'hasLayout' in IE
        if (!keep) this.style.border = 'none';
        strip.style.borderColor = cc || gpc(this.parentNode);
        var cssHeight = jQuery.curCSS(this, 'height');
        for (var j in edges) {
            var bot = edges[j];
            strip.style.borderStyle = 'none ' +
              (opts[j + 'R'] ? 'solid' : 'none') +
              ' none ' + (opts[j + 'L'] ? 'solid' : 'none');
            var d = document.createElement('DIV');
            var ds = d.style;
            bot ? this.appendChild(d) : this.insertBefore(d, this.firstChild);
            if (bot && cssHeight != 'auto') {
                if (jQuery.css(this, 'position') == 'static')
                  this.style.position = 'relative';
                ds.position = 'absolute';
                ds.bottom = ds.left = ds.padding = ds.margin = '0';
                if (jQuery.browser.msie)
                  ds.setExpression('width', 'this.parentNode.offsetWidth');
                else ds.width = '100%';
                }
            else
              ds.margin = !bot ?
                ('-' + pad.T + 'px -' + pad.R + 'px ' +
                  (pad.T - width) + 'px -' + pad.L + 'px') :
                ((pad.B - width) + 'px -' + pad.R + 'px -' + pad.B +
                  'px -' + pad.L + 'px');
            for (var i = 0; i < width; i ++) {
                var w = Math.max(0, getW(i));
                var e = strip.cloneNode(false);
                e.style.borderWidth = '0 ' + (opts[j + 'R'] ? w : 0) +
                  'px 0 ' + (opts[j + 'L'] ? w : 0) + 'px';
                bot ? d.appendChild(e) : d.insertBefore(e, d.firstChild);
                }
            }
        });
    };