/*
 * 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);
}
}
});
};