HistogramView.cs

// AForge debugging visualizers
// AForge.NET framework
// http://www.aforgenet.com/framework/
//
// Copyright © AForge.NET, 2011
// contacts@aforgenet.com
//

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Windows.Forms;
using AForge.Math;

namespace AForge.DebuggerVisualizers
{
    public partial class HistogramView : Form
    {
        private const int HistogramHeight = 100;
        private Histogram histogram;

        public HistogramView( )
        {
            InitializeComponent( );
        }

        public void SetHistogram( Histogram histogram )
        {
            this.histogram = histogram;

            histogramControl.Values = histogram.Values;
            int length = histogram.Values.Length;

            Text = string.Format( "Histogram - {0} values", length );
            statsBox.Text = string.Format( "Min: {0}   Max: {1}   Mean: {2:F2}   Std.Dev.: {3:F2}",
                histogram.Min, histogram.Max, histogram.Mean, histogram.StdDev );

            // set form size
            int formWidth  = System.Math.Min( 800, length ) + 40;
            int formHeight = HistogramHeight + 120;

            this.Size = new Size( formWidth, formHeight );

            // set histogram control size
            int width = length + 2;
            int height = HistogramHeight + 2;

            int x = ( width > mainPanel.ClientSize.Width ) ? 0 : ( mainPanel.ClientSize.Width - width ) / 2;
            int y = ( height > mainPanel.ClientSize.Height ) ? 0 : ( mainPanel.ClientSize.Height - height ) / 2;

            histogramControl.SuspendLayout( );
            histogramControl.Size = new Size( width, height );
            histogramControl.Location = new System.Drawing.Point( x, y );
            histogramControl.ResumeLayout( );
        }

        // Mouse cursor's position has changed within histogram control
        private void histogramControl_PositionChanged( object sender, AForge.Controls.HistogramEventArgs e )
        {
            if ( histogram != null )
            {
                int pos = e.Position;

                if ( pos != -1 )
                {
                    textBox.Text = string.Format( "Value: {0}   Count: {1}   Percent: {2:F2}",
                        pos, histogram.Values[pos], ( (float) histogram.Values[pos] * 100 / histogram.TotalCount ) );
                }
                else
                {
                    textBox.Text = string.Empty;
                }
            }
        }

        // Selection has changed within histogram control
        private void histogramControl_SelectionChanged( object sender, AForge.Controls.HistogramEventArgs e )
        {
            if ( histogram != null )
            {
                int min = e.Min;
                int max = e.Max;
                int count = 0;

                // count pixels
                for ( int i = min; i <= max; i++ )
                {
                    count += histogram.Values[i];
                }

                textBox.Text = string.Format( "Values: {0}...{1}   Count: {2}   Percent: {3:F2}",
                    min, max, count, ( (float) count * 100 / histogram.TotalCount ) );
            }
        }

        private void logCheck_CheckedChanged( object sender, EventArgs e )
        {
            histogramControl.IsLogarithmicView = logCheck.Checked;
        }
    }
}