/*!

 * jQuery corner plugin: simple corner rounding

 * Examples and documentation at: http://jquery.malsup.com/corner/

 * version 2.03 (05-DEC-2009)

 * Dual licensed under the MIT and GPL licenses:

 * http://www.opensource.org/licenses/mit-license.php

 * http://www.gnu.org/licenses/gpl.html

 */



/**

 *  corner() takes a single string argument:  $('#myDiv').corner("effect corners width")

 *

 *  effect:  name of the effect to apply, such as round, bevel, notch, bite, etc (default is round). 

 *  corners: one or more of: top, bottom, tr, tl, br, or bl. 

 *           by default, all four corners are adorned. 

 *  width:   width of the effect; in the case of rounded corners this is the radius. 

 *           specify this value using the px suffix such as 10px (and yes, it must be pixels).

 *

 * @author Dave Methvin (http://methvin.com/jquery/jq-corner.html)

 * @author Mike Alsup   (http://jquery.malsup.com/corner/)

 */

;(function($) { 



var ua = navigator.userAgent;

var moz = $.browser.mozilla && /gecko/i.test(ua);

var webkit = $.browser.safari && /Safari\/[5-9]/.test(ua);



var expr = $.browser.msie && (function() {

    var div = document.createElement('div');

    try { div.style.setExpression('width','0+0'); div.style.removeExpression('width'); }

    catch(e) { return false; }

    return true;

})();

    

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 == 'rgba(0, 0, 0, 0)')

            continue; // webkit

        if (v.indexOf('rgb') >= 0) { 

            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 getWidth(fx, i, width) {

    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;

    }

};



$.fn.corner = function(options) {

    // in 1.3+ we can fix mistakes with the ready state

	if (this.length == 0) {

        if (!$.isReady && this.selector) {

            var s = this.selector, c = this.context;

            $(function() {

                $(s,c).corner(options);

            });

        }

        return this;

	}



    return this.each(function(index){

		var $this = $(this);

		var o = [ options || '', $this.attr($.fn.corner.defaults.metaAttr) || ''].join(' ').toLowerCase();

		//var o = (options || $this.attr($.fn.corner.defaults.metaAttr) || '').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|left/.test(o),       TR:  /top|tr|right/.test(o),

			BL:  /bottom|bl|left/.test(o),    BR:  /bottom|br|right/.test(o)

		};

		if ( !opts.TL && !opts.TR && !opts.BL && !opts.BR )

			opts = { TL:1, TR:1, BL:1, BR:1 };

			

		// support native rounding

		if ($.fn.corner.defaults.useNative && fx == 'round' && (moz || webkit) && !cc && !sc) {

			if (opts.TL)

				$this.css(moz ? '-moz-border-radius-topleft' : '-webkit-border-top-left-radius', width + 'px');

			if (opts.TR)

				$this.css(moz ? '-moz-border-radius-topright' : '-webkit-border-top-right-radius', width + 'px');

			if (opts.BL)

				$this.css(moz ? '-moz-border-radius-bottomleft' : '-webkit-border-bottom-left-radius', width + 'px');

			if (opts.BR)

				$this.css(moz ? '-moz-border-radius-bottomright' : '-webkit-border-bottom-right-radius', width + 'px');

			return;

		}

			

		var strip = document.createElement('div');

		strip.style.overflow = 'hidden';

		strip.style.height = '1px';

		strip.style.backgroundColor = sc || 'transparent';

		strip.style.borderStyle = 'solid';

	

        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 (typeof this.style.zoom != undefined) 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 (expr)

                        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

                    if (expr) {

                        var bw = sz(this,'borderLeftWidth') + sz(this,'borderRightWidth');

                        ds.setExpression('width', 'this.parentNode.offsetWidth - '+bw+'+ "px"');

                    }

                    else

                        ds.width = '100%';

                }

                else {

                	ds.position = 'relative';

                    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,getWidth(fx,i, width));

                    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() { 

	if (moz || webkit)

		this.css(moz ? '-moz-border-radius' : '-webkit-border-radius', 0);

	$('div.jquery-corner', this).remove();

	return this;

};



// expose options

$.fn.corner.defaults = {

	useNative: true, // true if plugin should attempt to use native browser support for border radius rounding

	metaAttr:  'data-corner' // name of meta attribute to use for options

};

    

})(jQuery);

