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using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
public class MainForm : System.Windows.Forms.Form
{
private System.ComponentModel.Container components;
private ArrayList myPts = new ArrayList();
public MainForm()
{
InitializeComponent();
CenterToScreen();
this.Text = "click on me";
}
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}
private void InitializeComponent()
{
this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
this.ClientSize = new System.Drawing.Size(292, 273);
this.Text = "Form1";
this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.MainForm_MouseDown);
this.Paint += new System.Windows.Forms.PaintEventHandler(this.MainForm_Paint);
}
static void Main()
{
Application.Run(new MainForm());
}
private void MainForm_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
Graphics g = Graphics.FromHwnd(this.Handle);
// Add to points collection.
myPts.Add(new Point(e.X, e.Y));
Invalidate();
}
private void MainForm_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
{
Graphics g = e.Graphics;
foreach(Point p in myPts)
g.DrawEllipse(new Pen(Color.Green), p.X, p.Y, 10, 10);
}
}
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