Double buffer draw : Double Buffer : Graphics C# Source Code

    

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

public class Form1 : System.Windows.Forms.Form {
   private System.ComponentModel.Container components = null;

   public Form1() {
      InitializeComponent();
   }

   protected override void Dispose( bool disposing ) {
      if( disposing ) {
         if (components != null) {
            components.Dispose();
         }
      }
      base.Dispose( disposing );
   }

   private void InitializeComponent() {
      this.components = new System.ComponentModel.Container();
      this.Size = new System.Drawing.Size(300,300);
      this.Text = "Form1";
   }

   static void Main() {
      Application.Run(new Form1());
   }

   protected override void OnPaint(PaintEventArgs e) {
      Graphics displayGraphics = e.Graphics;
      Random r = new Random();
      Image i = new Bitmap(ClientRectangle.Width, ClientRectangle.Height);
      Graphics g = Graphics.FromImage(i);

      g.FillRectangle(Brushes.White, ClientRectangle);

      for (int x = 0; x < ClientRectangle.Width; x++) {
         for (int y = 0; y < ClientRectangle.Height; y += 10) {
            Color c = Color.FromArgb (r.Next(25), r.Next(55), r.Next(5));
            Pen p = new Pen(c, 1);
            g.DrawLine(p, new Point(ClientRectangle.Width/2, ClientRectangle.Height/2), new Point(x, y));
            p.Dispose();
         }
      }
      displayGraphics.DrawImage(i, ClientRectangle);
      i.Dispose();
  }
}