WindowsFormsApp/BufferingExample.cs

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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;

namespace WindowsFormsApp
{
    public partial class BufferingExample : Form
    {
        private BufferedGraphicsContext context;
        private BufferedGraphics grafx;

        private byte bufferingMode;
        private string[] bufferingModeStrings =
        { "Draw to Form without OptimizedDoubleBufferring control style",
          "Draw to Form using OptimizedDoubleBuffering control style",
          "Draw to HDC for form" };

        private System.Windows.Forms.Timer timer1;
        private byte count;
        public BufferingExample()
        {
            InitializeComponent();

            // Configure the Form for this example. 
            this.Text = "User double buffering";
            this.MouseDown += new MouseEventHandler(this.MouseDownHandler);
            this.Resize += new EventHandler(this.OnResize);
            this.SetStyle(ControlStyles.AllPaintingInWmPaint | ControlStyles.UserPaint, true);

            // Configure a timer to draw graphics updates. 
            timer1 = new System.Windows.Forms.Timer();
            timer1.Interval = 200;
            timer1.Tick += new EventHandler(this.OnTimer);

            bufferingMode = 2;
            count = 0;

            // Retrieves the BufferedGraphicsContext for the  
            // current application domain. 
            context = BufferedGraphicsManager.Current;

            // Sets the maximum size for the primary graphics buffer 
            // of the buffered graphics context for the application 
            // domain.  Any allocation requests for a buffer larger  
            // than this will create a temporary buffered graphics  
            // context to host the graphics buffer. 
            context.MaximumBuffer = new Size(this.Width + 1, this.Height + 1);

            // Allocates a graphics buffer the size of this form 
            // using the pixel format of the Graphics created by  
            // the Form.CreateGraphics() method, which returns a  
            // Graphics object that matches the pixel format of the form. 
            grafx = context.Allocate(this.CreateGraphics(),
                 new Rectangle(0, 0, this.Width, this.Height));