/**
*
* phpBBVietNam2 [PinkSun]
*
* @package js
* @version $Id: fat.js,v 1.001 2007/04/20 16:24:00 nedka Exp $
* @copyright (c) 2007 phpBBVietNam Group
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
*
*/

/**
* phpBBVietNam2 Included Javascript File
*
* Script part: AJAX Chatbox
* Script name: The Fade Anything Technique
* Script version: 1.0-RC1
* Author: Adam Michela (http://www.axentric.com/aside/fat/)
*/

var Fat = {
	make_hex : function (r, g, b) 
	{
		r = r.toString(16);
		if (r.length == 1)
		{
			r = '0' + r;
		}

		g = g.toString(16);
		if (g.length == 1)
		{
			g = '0' + g;
		}

		b = b.toString(16);
		if (b.length == 1)
		{
			b = '0' + b;
		}

		return "#" + r + g + b;
	},
	fade_all : function ()
	{
		var a = document.getElementsByTagName("*");
		for (var i = 0; i < a.length; i++) 
		{
			var o = a[i];
			var r = /fade-?(\w{3,6})?/.exec(o.className);

			if (r)
			{
				if (!r[1])
				{
					r[1] = '';
				}

				if (o.id)
				{
					Fat.fade_element(o.id, null, null, "#" + r[1]);
				}
			}
		}
	},
	fade_element : function (id, fps, duration, from, to) 
	{
		if (!fps)
		{
			fps = 30;
		}

		if (!duration)
		{
			duration = 3000;
		}
		
		if (!from || from == '#')
		{
			from = '#FFFF33';
		}

		if (!to)
		{
			to = this.get_bgcolor(id);
		}
		
		var frames = Math.round(fps * (duration / 1000));
		var interval = duration / frames;
		var delay = interval;
		var frame = 0;
		
		if (from.length < 7)
		{
			from += from.substr(1, 3);
		}

		if (to.length < 7)
		{
			to += to.substr(1, 3);
		}

		var rf = parseInt(from.substr(1, 2), 16);
		var gf = parseInt(from.substr(3, 2), 16);
		var bf = parseInt(from.substr(5, 2), 16);
		var rt = parseInt(to.substr(1, 2), 16);
		var gt = parseInt(to.substr(3, 2), 16);
		var bt = parseInt(to.substr(5, 2), 16);

		var r, g, b, h;

		while (frame < frames)
		{
			r = Math.floor(rf * ((frames - frame) / frames) + rt * (frame / frames));
			g = Math.floor(gf * ((frames - frame) / frames) + gt * (frame / frames));
			b = Math.floor(bf * ((frames - frame) / frames) + bt * (frame / frames));
			h = this.make_hex(r, g, b);

			setTimeout("Fat.set_bgcolor('" + id + "', '" + h + "')", delay);

			frame++;
			delay = interval * frame; 
		}
		setTimeout("Fat.set_bgcolor('" + id + "', '" + to + "')", delay);
	},
	set_bgcolor : function (id, c)
	{
		var o = document.getElementById(id);
		o.style.backgroundColor = c;
	},
	get_bgcolor : function (id)
	{
		var o = document.getElementById(id);

		while(o)
		{
			var c;

			if (window.getComputedStyle)
			{
				c = window.getComputedStyle(o, null).getPropertyValue("background-color");
			}

			if (o.currentStyle)
			{
				c = o.currentStyle.backgroundColor;
			}

			if ((c != '' && c != "transparent") || o.tagName == 'BODY')
			{
				break;
			}

			o = o.parentNode;
		}

		if (c == undefined || c == '' || c == 'transparent')
		{
			c = '#FFFFFF';
		}

		var rgb = c.match(/rgb\s*\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*\)/);

		if (rgb)
		{
			c = this.make_hex(parseInt(rgb[1]), parseInt(rgb[2]), parseInt(rgb[3]));
		}

		return c;
	}
}