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| using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
namespace ControlPaint
{
public partial class Form2 : Form
{
private volatile int Chiffre;
public event PaintEventHandler Paint;
public Form2()
{
InitializeComponent();
Paint+=new PaintEventHandler(ProcessPaint);
GenPaint();
}
// Methode pour signaler qu'un PaintEventArgs a eu lieu
protected override void OnPaint(PaintEventArgs pe)
{
base.OnPaint(pe);
if (Paint != null) Paint(new object(), pe);
}
// Methode pour générer des events de type PaintEventArgs
private void GenPaint()
{
Random ran = new Random();
Graphics g = Graphics.FromHwnd(this.Handle);
for (int chiffre = 0; chiffre < 50; chiffre += 5)
{
OnPaint(
new PaintEventArgs(g,
new Rectangle(0, 0, chiffre, 2 * chiffre))
);
this.Chiffre = chiffre;
}
}
// Methode qui reagit lorsqu'un PaintEventArgs se produit
private void ProcessPaint(object sender, PaintEventArgs pe)
{
this.Refresh();
if(InvokeRequired)
{
this.Invoke(
new PaintEventHandler(ProcessPaint),
new object[] { sender, pe }
);
return;
}
Graphics g = pe.Graphics;
// graver le Chiffre sur le formulaire
g.DrawString(
this.Chiffre.ToString(),
new Font("Arial",14 ,FontStyle.Bold),
new SolidBrush(Color.Blue),
this.Chiffre, this.Chiffre * 2
);
}
}
} |
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