Histogram.cs
Description du code
Histogram.cs est un fichier du projet PhotoBrol.Ce fichier est situé dans /var/www/bin/sniplets/bibliobrol/photobrol/.
Projet PhotoBrol :
Editeur d'images en CSharp.
Code source ou contenu du fichier
Code c# (Histogram.cs) (307 lignes)
using System; using System.Collections; using System.ComponentModel; using System.Drawing; using System.Data; using System.Windows.Forms; namespace be.gaudry.photobrol.view.controls.histogram { public class Histogram : Control { #region declarations and constructors private Color color; private int width; private int height; private bool log; private int[] values; private int max; private double maxLog; private bool allowSelection; private Pen blackPen; private Pen whitePen; private Pen drawPen; private bool tracking; private bool over; private int start, stop; // events public delegate void HistogramEventHandler(object sender, HistogramEventArgs e); public event HistogramEventHandler PositionChanged; public event HistogramEventHandler SelectionChanged; public Histogram() { color = Color.Black; width = 256; height = 150; log = true; tracking = false; over = false; InitializeComponent(); SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.ResizeRedraw | ControlStyles.DoubleBuffer | ControlStyles.UserPaint, true); } #endregion #region properties // Color property public Color Color { get { return color; } set { color = value; drawPen.Dispose(); Invalidate(); } } // Width property [DefaultValue(256)] public int HistogramWidth { get { return width; } set { width = value; Invalidate(); } } // Height property [DefaultValue(150)] public int HistogramHeight { get { return height; } set { height = value; Invalidate(); } } // Allow selection property [DefaultValue(false)] public bool AllowSelection { get { return allowSelection; } set { allowSelection = value; } } // LogView property [DefaultValue(false)] public bool LogView { get { return log; } set { log = value; Invalidate(); } } // Values property [Browsable(false)] public int[] Values { set { values = value; if (values != null) { // get the max max = 0; foreach (int v in values) { if (v > max) { max = v; maxLog = Math.Log10(max); } } } Invalidate(); } } #endregion // Dispose protected override void Dispose( bool disposing ) { if ( disposing ) { blackPen.Dispose( ); whitePen.Dispose( ); drawPen.Dispose( ); } base.Dispose( disposing ); } // Init component private void InitializeComponent( ) { // // Histogram // } // Paint control protected override void OnPaint( PaintEventArgs pe ) { Graphics g = pe.Graphics; int x = ( ClientRectangle.Right - width ) / 2; int y = 5; int l; // draw rectangle around the image g.DrawRectangle( blackPen, x - 1, y - 1, width + 1, height + 1 ); if ( values != null ) { int count = Math.Min( values.Length, width ); int start = Math.Min( this.start, this.stop ); int stop = Math.Max( this.start, this.stop ); if ( tracking ) { // fill region of selection g.FillRectangle( brush, x + start, y, Math.Abs( start - stop ), height ); brush.Dispose( ); } // draw histogram for ( int i = 0; i < count; i++ ) { if ( log ) { l = ( values[i] == 0 ) ? 0 : (int) ( Math.Log10( values[i] ) * height / maxLog ); } else { l = (int) ( values[i] * height / max ); } if ( l != 0 ) { g.DrawLine( ( ( tracking ) && ( i >= start ) && ( i <= stop ) ) ? whitePen : drawPen, ); } } } // Calling the base class OnPaint base.OnPaint( pe ); } // On mouse down private void Histogram_MouseDown( object sender, System.Windows.Forms.MouseEventArgs e ) { if ( ( allowSelection ) && ( values != null ) ) { int x = ( ClientRectangle.Right - width ) / 2; int y = 5; if ( ( e.X >= x ) && ( e.Y >= y ) && ( e.X < x + width ) && ( e.Y < y + height ) ) { // start selection tracking = true; start = e.X - x; this.Capture = true; } } } // On mouse up private void Histogram_MouseUp( object sender, System.Windows.Forms.MouseEventArgs e ) { if ( tracking ) { // stop selection tracking = false; this.Capture = false; Invalidate( ); } } // On mouse move private void Histogram_MouseMove( object sender, System.Windows.Forms.MouseEventArgs e ) { if ( ( allowSelection ) && ( values != null ) ) { int x = ( ClientRectangle.Right - width ) / 2; int y = 5; if ( !tracking ) { if ( ( e.X >= x ) && ( e.Y >= y ) && ( e.X < x + width ) && ( e.Y < y + height ) ) { over = true; // moving over this.Cursor = Cursors.Cross; // notify parent if ( PositionChanged != null ) } else { this.Cursor = Cursors.Default; if ( over ) { over = false; // notify parent if ( PositionChanged != null ) } } } else { // selecting region stop = e.X - x; stop = Math.Min( stop, 255 ); stop = Math.Max( stop, 0 ); Invalidate( ); // notify parent if ( SelectionChanged != null ) SelectionChanged( this, new HistogramEventArgs( Math.Min( start, stop ), Math.Max( start, stop ) ) ); } } } // On mouse leave private void Histogram_MouseLeave( object sender, System.EventArgs e ) { if ( ( allowSelection ) && ( values != null ) && ( !tracking ) ) { // notify parent if ( PositionChanged != null ) } } } }
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| _ | Répertoire parent | 0 octets | 1734980653 23/12/2024 20:04:13 |
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English translation
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Document created the 30/10/2009, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/cs-photobrol-source-rf-view/controls/histogram//Histogram.cs.html
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