/Main/src/Xbap/DynamicDataDisplay.Xbap.Samples/Demos/v02/ImageHistogram.xaml.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Data;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Imaging;

using System.Windows.Navigation;

using System.Windows.Shapes;

using Microsoft.Research.DynamicDataDisplay.DataSources;

using Microsoft.Win32;



namespace Microsoft.Research.DynamicDataDisplay.Samples.Demos.v02

{

	/// <summary>

	/// Interaction logic for ImageHistogram.xaml

	/// </summary>

	public partial class ImageHistogram : Page

	{

		public ImageHistogram()

		{

			InitializeComponent();

		}



		private void OnOpenImageClick(object sender, RoutedEventArgs e)

		{

			OpenFileDialog dlg = new OpenFileDialog();

			dlg.Filter = "Image|*.bmp;*.jpg;*.png;*.gif";

			if (dlg.ShowDialog(Window.GetWindow(this)).GetValueOrDefault(false))

			{

				OpenImage(dlg.FileName);

			}

		}



		private void OpenImage(string fileName)

		{

			BitmapImage bmp = new BitmapImage(new Uri(fileName));

			bmp.CacheOption = BitmapCacheOption.OnLoad;



			image.Source = bmp;

			ProcessImage(bmp);

		}



		EnumerableDataSource<int> red;

		EnumerableDataSource<int> green;

		EnumerableDataSource<int> blue;



		int[] reds = new int[256];

		int[] greens = new int[256];

		int[] blues = new int[256];

		byte[] pixels;

		private void ProcessImage(BitmapImage bmp)

		{

			byte[] pixels = new byte[bmp.PixelWidth * bmp.PixelHeight * 4];

			bmp.CopyPixels(pixels, bmp.PixelWidth * 4, 0);



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

			{

				//BGRA

				blues[pixels[i++]]++;

				greens[pixels[i++]]++;

				reds[pixels[i++]]++;

				i++;

			}



			CreateHistograms();

		}



		private void CreateHistograms()

		{

			EnumerableDataSource<int> x = new EnumerableDataSource<int>(Enumerable.Range(0, 256).ToArray());

			x.SetXMapping(_x => _x);



			Func<int, double> mapping;

			if (check.IsChecked.GetValueOrDefault())

				mapping = logMapping;

			else

				mapping = linearMapping;



			red = new EnumerableDataSource<int>(reds);

			red.SetYMapping(mapping);

			green = new EnumerableDataSource<int>(greens);

			green.SetYMapping(mapping);

			blue = new EnumerableDataSource<int>(blues);

			blue.SetYMapping(mapping);



			CompositeDataSource rDS = new CompositeDataSource(x, red);

			CompositeDataSource gDS = new CompositeDataSource(x, green);

			CompositeDataSource bDS = new CompositeDataSource(x, blue);



			plotter.RemoveUserElements();

			// todo

			//plotter.AddLineGraph(rDS, Colors.Red, 1, "Red").FilteringEnabled = false;

			//plotter.AddLineGraph(gDS, Colors.Green, 1, "Green").FilteringEnabled = false;

			//plotter.AddLineGraph(bDS, Colors.Blue, 1, "Blue").FilteringEnabled = false;

		}



		private Func<int, double> logMapping = i => i > 0 ? Math.Log10(i) : 0;

		private Func<int, double> linearMapping = i => i;



		private void CheckBox_Checked(object sender, RoutedEventArgs e)

		{

			Func<int, double> mapping;

			if (check.IsChecked.GetValueOrDefault())

				mapping = logMapping;

			else

				mapping = linearMapping;



			red.SetYMapping(mapping);

			green.SetYMapping(mapping);

			blue.SetYMapping(mapping);

		}

	}

}