package com.yorktea.tracker
{
	import flash.display.BitmapData;
	import flash.events.EventDispatcher;
	import flash.geom.Point;
	import flash.utils.ByteArray;

	public class ColorTracker extends EventDispatcher
	{

		public function ColorTracker()
		{
		}

		private function rgbToHsv(r:int,g:int,b:int):HSV
		{
			var hsv:HSV = new HSV();

			var min:Number, max:Number, delta:Number;
			min = Math.min(r, g, b);
			max = Math.max(r, g, b);

			hsv.v = max;
			delta = max - min;
			if (max != 0)
			{
				hsv.s = delta / max;

				if (r == max)
				{
					hsv.h = (g-b) / delta;
				}
				else if (g==max)
				{
					hsv.h = 2 + (b-r) / delta;
				}
				else
				{
					hsv.h = 4 + (r-g) / delta;
				}
				hsv.h *= 60;

				if (hsv.h < 0)
				{
					hsv.h += 360;
				}
			}
			else
			{
				hsv.h = 0;
				hsv.s = 0;
				hsv.v = 0;
			}

			return hsv;
		}

		public function update(bd:BitmapData):Point
		{
			var ba:ByteArray = bd.getPixels(bd.rect);
			ba.position = 0;

			var px:uint;
			var r:int, g:int, b:int;
			var x:int, y:int;

			for(y = 0;y < bd.height; y++)
			{
				for(x = 0;x < bd.width; x++)
				{
					px = ba.readUnsignedInt();
					r = (px >> 20) & 0xf;
					g = (px >> 12) & 0xf;
					b = (px >> 4) & 0xf;

					var hsv:HSV = rgbToHsv(r, g, b);
					trace(hsv);
				}
			}

			return null;
		}
	}
}

class HSV
{

	public var h:Number;
	public var s:Number;
	public var v:Number;

	public function toString():String
	{
		return "H: " + h + " S: " + s + " V:" + v;
	}
}