using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;



namespace Microsoft.Research.DynamicDataDisplay.Maps.Charts.VectorFields

{

	public class NormalizeFilter : VectorFieldConvolutionFilter

	{

		public override void ApplyFilter(int[] pixels, int width, int height, Vector[,] field)

		{

			double minBrightness = Double.PositiveInfinity;

			double maxBrightness = Double.NegativeInfinity;



			for (int i = 0; i < pixels.Length; i++)

			{

				int x = i % width;

				int y = i / width;



				int argb = pixels[i];

				var color = HsbColor.FromArgb(argb);

				var brightness = color.Brightness;



				if (brightness < minBrightness)

					minBrightness = brightness;

				if (brightness > maxBrightness)

					maxBrightness = brightness;

			}



			for (int i = 0; i < pixels.Length; i++)

			{

				int argb = pixels[i];

				var color = HsbColor.FromArgb(argb);

				var brightness = color.Brightness;



				double ratio = (brightness - minBrightness) / (maxBrightness - minBrightness);

				color.Brightness = ratio;

				pixels[i] = color.ToArgb();

			}

		}

	}

}