includes/clientside/static/fat.js
author Dan
Fri, 17 Jul 2009 20:28:24 -0400
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// @name      The Fade Anything Technique
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// @namespace http://www.axentric.com/aside/fat/
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// @version   1.0-RC1
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// @author    Adam Michela
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var Fat = {
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	make_hex : function (r,g,b) 
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	{
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		r = r.toString(16); if (r.length == 1) r = '0' + r;
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		g = g.toString(16); if (g.length == 1) g = '0' + g;
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		b = b.toString(16); if (b.length == 1) b = '0' + b;
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		return "#" + r + g + b;
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	},
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	fade_all : function ()
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	{
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		var a = document.getElementsByTagName("div");
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		for (var i = 0; i < a.length; i++) 
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		{
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			var o = a[i];
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			var r = /fade-?(\w{3,6})?/.exec(o.className);
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			if (r)
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			{
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				if (!r[1]) r[1] = "";
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        if (!o.id) o.id = 'autofat_'+Math.floor(Math.random() * 100000);
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				if (o.id) Fat.fade_element(o.id,null,null,"#"+r[1]);
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			}
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		}
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	},
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	fade_element : function (id, fps, duration, from, to) 
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	{
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		if (!fps) fps = 30;
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		if (!duration) duration = 3000;
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		if (!from || from=="#") from = "#FFFF33";
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		if (!to) to = this.get_bgcolor(id);
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		var frames = Math.round(fps * (duration / 1000));
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		var interval = duration / frames;
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		var delay = interval;
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		var frame = 0;
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		if (from.length < 7) from += from.substr(1,3);
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		if (to.length < 7) to += to.substr(1,3);
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		var rf = parseInt(from.substr(1,2),16);
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		var gf = parseInt(from.substr(3,2),16);
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		var bf = parseInt(from.substr(5,2),16);
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		var rt = parseInt(to.substr(1,2),16);
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		var gt = parseInt(to.substr(3,2),16);
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		var bt = parseInt(to.substr(5,2),16);
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		var r,g,b,h;
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		while (frame < frames)
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		{
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			r = Math.floor(rf * ((frames-frame)/frames) + rt * (frame/frames));
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			g = Math.floor(gf * ((frames-frame)/frames) + gt * (frame/frames));
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			b = Math.floor(bf * ((frames-frame)/frames) + bt * (frame/frames));
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			h = this.make_hex(r,g,b);
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			setTimeout("Fat.set_bgcolor('"+id+"','"+h+"')", delay);
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			frame++;
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			delay = interval * frame; 
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		}
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		setTimeout("Fat.set_bgcolor('"+id+"','"+to+"')", delay);
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	},
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	set_bgcolor : function (id, c)
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	{
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		var o = document.getElementById(id);
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    if(!o) return;
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		o.style.backgroundColor = c;
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	},
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	get_bgcolor : function (id)
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	{
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		var o = document.getElementById(id);
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		while(o)
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		{
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			var c;
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			if (window.getComputedStyle) c = window.getComputedStyle(o,null).getPropertyValue("background-color");
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			if (o.currentStyle) c = o.currentStyle.backgroundColor;
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			if ((c != "" && c != "transparent") || o.tagName == "BODY") { break; }
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			o = o.parentNode;
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		}
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		if (c == undefined || c == "" || c == "transparent") c = "#FFFFFF";
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		var rgb = c.match(/rgb\s*\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*\)/);
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		if (rgb) c = this.make_hex(parseInt(rgb[1]),parseInt(rgb[2]),parseInt(rgb[3]));
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		return c;
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	}
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}
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addOnloadHook(Fat.fade_all);
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