/*!
 * jQuery corner plugin: simple corner rounding
 * Examples and documentation at: http://jquery.malsup.com/corner/
 * version 1.95 (02/26/2009)
 * 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:  $('#myDiv').corner("effect corners width")
 *
 *  effect:  name of the effect to apply, such as round, bevel, notch, bite, etc (default is round). 
 *  corners: one or more of: top, bottom, tr, tl, br, or bl. 
 *       by default, all four corners are adorned. 
 *  width:   width of the effect; in the case of rounded corners this is the radius. 
 *       specify this value using the px suffix such as 10px (and yes, it must be pixels).
 *
 * @name corner
 * @type jQuery
 * @param String options Options which control the corner style
 * @cat Plugins/Corner
 * @return jQuery
 * @author Dave Methvin (http://methvin.com/jquery/jq-corner.html)
 * @author Mike Alsup   (http://jquery.malsup.com/corner/)
 */
;(function($) { 

var expr = (function() {
  var div = document.createElement('div');
  try { div.style.setExpression('width','0+0'); }
  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 = $.css(node,'backgroundColor');
    if ( v.indexOf('rgb') >= 0 ) { 
      if ($.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 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;
  }
};

$.fn.corner = function(o) {
  // in 1.3+ we can fix mistakes with the ready state
	if (this.length == 0) {
    if (!$.isReady && this.selector) {
      var s = this.selector, c = this.context;
      $(function() {
        $(s,c).corner(o);
      });
    }
    return this;
	}

  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 (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.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() { return $('.jquery-corner', this).remove(); };
  
})(jQuery);