You would set the AutoScrollPosition for this.
After my signature is a simple application that demonstrates the idea.
--
Bob Powell [MVP]
Visual C#, System.Drawing
Ramuseco Limited .NET consulting
http://www.ramuseco.com
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using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
namespace CenterScrollPanel
{
/// <summary>
/// Summary description for Form1.
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Panel panel1;
private System.Windows.Forms.Button button1;
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.Container components = null;
public Form1()
{
//
// Required for Windows Form Designer support
//
InitializeComponent();
//
// TODO: Add any constructor code after InitializeComponent call
//
}
/// <summary>
/// Clean up any resources being used.
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.panel1 = new System.Windows.Forms.Panel();
this.button1 = new System.Windows.Forms.Button();
this.SuspendLayout();
//
// panel1
//
this.panel1.AutoScroll = true;
this.panel1.AutoScrollMinSize = new System.Drawing.Size(1024, 768);
this.panel1.Location = new System.Drawing.Point(8, 8);
this.panel1.Name = "panel1";
this.panel1.Size = new System.Drawing.Size(272, 208);
this.panel1.TabIndex = 0;
this.panel1.Paint += new
System.Windows.Forms.PaintEventHandler(this.panel1_Paint);
//
// button1
//
this.button1.Location = new System.Drawing.Point(16, 232);
this.button1.Name = "button1";
this.button1.TabIndex = 1;
this.button1.Text = "Recenter";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 266);
this.Controls.Add(this.button1);
this.Controls.Add(this.panel1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);
}
#endregion
/// <summary>
/// The main entry point for the application.
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}
private void panel1_Paint(object sender, System.Windows.Forms.PaintEventArgs
e)
{
e.Graphics.Transform=new
Matrix(1,0,0,1,this.panel1.AutoScrollPosition.X,this.panel1.AutoScrollPosition.Y);
Pen p=new Pen(Color.Red,3);
e.Graphics.DrawLine(p,512,374,512,394);
e.Graphics.DrawLine(p,502,384,522,384);
p.Dispose();
}
private void button1_Click(object sender, System.EventArgs e)
{
this.panel1.AutoScrollPosition=new Point(
this.panel1.AutoScrollMinSize.Width/2-this.panel1.ClientRectangle.Width/2,
this.panel1.AutoScrollMinSize.Height/2-this.panel1.ClientSize.Height/2);
}
}
}
