/*
 * jQuery corner plugin
 *
 * version 1.92 (12/18/2007)
 *
 * 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 $('.adorn').corner("round 8px").parent().css('padding', '4px').corner("round 10px");
 * @desc Create a rounded border effect by styling both the element and its parent
 * 
 * @name corner
 * @type jQuery
 * @param String options Options which control the corner style
 * @cat Plugins/Corner
 * @return jQuery
 * @author Dave Methvin (dave.methvin@gmail.com)
 * @author Mike Alsup (malsup@gmail.com)
 */
(function($) { 

$.fn.corner = function(o) {
		var ie6 = $.browser.msie && /MSIE 6.0/.test(navigator.userAgent);
		function sz(el, p) { return parseInt($.css(el,p))||0; };
		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 = $.css(node,'backgroundColor');
						if ( v.indexOf('rgb') >= 0 ) { 
								if ($.browser.safari && v == 'rgba(0, 0, 0, 0)')
										continue;
								var 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($.css(this,'paddingTop'))||0,		 R: parseInt($.css(this,'paddingRight'))||0,
						B: parseInt($.css(this,'paddingBottom'))||0,	L: parseInt($.css(this,'paddingLeft'))||0
				};

				if ($.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 = $.curCSS(this, 'height');

				for (var j in edges) {
						var bot = edges[j];
						// only add stips if needed
						if ((bot && (opts.BL || opts.BR)) || (!bot && (opts.TL || opts.TR))) {
								strip.style.borderStyle = 'none '+(opts[j+'R']?'solid':'none')+' none '+(opts[j+'L']?'solid':'none');
								var d = document.createElement('div');
								$(d).addClass('jquery-corner');
								var ds = d.style;

								bot ? this.appendChild(d) : this.insertBefore(d, this.firstChild);

								if (bot && cssHeight != 'auto') {
										if ($.css(this,'position') == 'static')
												this.style.position = 'relative';
										ds.position = 'absolute';
										ds.bottom = ds.left = ds.padding = ds.margin = '0';
										if ($.browser.msie)
												ds.setExpression('width', 'this.parentNode.offsetWidth');
										else
												ds.width = '100%';
								}
								else if (!bot && $.browser.msie) {
										if ($.css(this,'position') == 'static')
												this.style.position = 'relative';
										ds.position = 'absolute';
										ds.top = ds.left = ds.right = ds.padding = ds.margin = '0';
										
										// fix ie6 problem when blocked element has a border width
										var bw = 0;
										if (ie6 || !$.boxModel)
												bw = sz(this,'borderLeftWidth') + sz(this,'borderRightWidth');
										ie6 ? ds.setExpression('width', 'this.parentNode.offsetWidth - '+bw+'+ "px"') : 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);
								}
						}
				}
		});
};

$.fn.uncorner = function(o) { return $('.jquery-corner', this).remove(); };
		
})(jQuery);