/*

 * Prototype/Scriptaculous corner plugin version 0.1 (6/29/2007)

 *

 * Based on the 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 Effect.Corner class provides a simple way of styling DOM elements.  

 *

 * Effect.Corner constructor takes two arguments:  new Effect.Corner(element, "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 new Effect.Corner(element);

 * @desc Create round, 10px corners 

 *

 * @example new Effect.Corner(element, "25px");

 * @desc Create round, 25px corners 

 *

 * @name corner

 * @type scriptaculous

 * @author Ilia Lobsanov (first name @ last name dot com)

 */

Effect.Corner = Class.create();

Object.extend(Object.extend(Effect.Corner.prototype, Effect.Base.prototype), {

    hex2: function (s) {

        var s = parseInt(s).toString(16);

        return ( s.length < 2 ) ? '0'+s : s;

    },

    gpc: function (node) {

        for ( ; node && node.nodeName.toLowerCase() != 'html'; node = node.parentNode  ) {

            //var v = jQuery.css(node,'backgroundColor');

            var v = Element.getStyle(node, 'backgroundColor');

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

                rgb = v.match(/\d+/g); 

                return '#'+ this.hex2(rgb[0]) + this.hex2(rgb[1]) + this.hex2(rgb[2]);

            }

            if ( v && v != 'transparent' )

                return v;

        }

        return '#ffffff';

    },

    getW: function (i) {

        switch(this.fx) {

        case 'round':  return Math.round(this.width*(1-Math.cos(Math.asin(i/this.width))));

        case 'cool':   return Math.round(this.width*(1+Math.cos(Math.asin(i/this.width))));

        case 'sharp':  return Math.round(this.width*(1-Math.cos(Math.acos(i/this.width))));

        case 'bite':   return Math.round(this.width*(Math.cos(Math.asin((this.width-i-1)/this.width))));

        case 'slide':  return Math.round(this.width*(Math.atan2(i,this.width/i)));

        case 'jut':    return Math.round(this.width*(Math.atan2(this.width,(this.width-i-1))));

        case 'curl':   return Math.round(this.width*(Math.atan(i)));

        case 'tear':   return Math.round(this.width*(Math.cos(i)));

        case 'wicked': return Math.round(this.width*(Math.tan(i)));

        case 'long':   return Math.round(this.width*(Math.sqrt(i)));

        case 'sculpt': return Math.round(this.width*(Math.log((this.width-i-1),this.width)));

        case 'dog':    return (i&1) ? (i+1) : this.width;

        case 'dog2':   return (i&2) ? (i+1) : this.width;

        case 'dog3':   return (i&3) ? (i+1) : this.width;

        case 'fray':   return (i%2)*this.width;

        case 'notch':  return this.width; 

        case 'bevel':  return i+1;

        }

    },

    initialize: function(element, o) {

        element = $(element);

		// Remove existing rounded corners, if any

		element.select('.cornerTopElem').each(function(item) { item.remove(); });

		element.select('.cornerBotElem').each(function(item) { item.remove(); });



        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

        this.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/;

        this.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';

        var pad = {

            T: parseInt(Element.getStyle(element,'paddingTop'))||0,     R: parseInt(Element.getStyle(element,'paddingRight'))||0,

            B: parseInt(Element.getStyle(element,'paddingBottom'))||0,  L: parseInt(Element.getStyle(element,'paddingLeft'))||0

        };



        if ( /MSIE/.test(navigator.userAgent) ) element.style.zoom = 1; // force 'hasLayout' in IE

        if (!keep) element.style.border = 'none';

        strip.style.borderColor = cc || this.gpc(element.parentNode);

        var cssHeight = Element.getHeight(element);



        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 ? element.appendChild(d) : element.insertBefore(d, element.firstChild);

			

			if (bot) {

				$(d).addClassName('cornerBotElem');

				element.appendChild(d)

			}

			else {

				$(d).addClassName('cornerTopElem');

				element.insertBefore(d, element.firstChild)

			}



            if (bot && cssHeight != 'auto') {

                if (Element.getStyle(element,'position') == 'static')

                    element.style.position = 'relative';

                ds.position = 'absolute';

                ds.bottom = ds.left = ds.padding = ds.margin = '0';

                if (/MSIE/.test(navigator.userAgent))
				
					ds.width = '100%';
                    //ds.setExpression('width', 'this.parentNode.offsetWidth');
                else

                    ds.width = '100%';

            }

            else {

                ds.margin = !bot ? '-'+pad.T+'px -'+pad.R+'px '+(pad.T-this.width)+'px -'+pad.L+'px' : 

                                    (pad.B-this.width)+'px -'+pad.R+'px -'+pad.B+'px -'+pad.L+'px';                

            }



            for (var i=0; i < this.width; i++) {

                var w = Math.max(0,this.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);

            }

        }

    }

});


