using System;
using System.Drawing;
using System.Threading;
using System.Windows.Forms;
public class AnimateBall : Form {
private int x, y;
private Button suspend = new Button();
private Button resume = new Button();
private Button abort = new Button();
Thread t;
public AnimateBall() {
BackColor = Color.White;
abort.Text = “Abort”;
suspend.Text = “Suspend”;
resume.Text = “Resume”;
int w = 20;
suspend.Location = new Point(w, 200);
resume.Location = new Point(w += 10 + suspend.Width, 200);
abort.Location = new Point(w += 10 + resume.Width, 200);
abort.Click += new EventHandler(Abort_Click);
suspend.Click += new EventHandler(Suspend_Click);
resume.Click += new EventHandler(Resume_Click);
Controls.Add(suspend);
Controls.Add(resume);
Controls.Add(abort);
t = new Thread(new ThreadStart(Run));
t.Start();
}
protected void Abort_Click(object sender, EventArgs e) {
t.Abort();
}
protected void Suspend_Click(object sender, EventArgs e) {
t.Suspend();
}
protected void Resume_Click(object sender, EventArgs e) {
t.Resume();
}
protected override void OnPaint( PaintEventArgs e ) {
Graphics g = e.Graphics;
g.FillEllipse(Brushes.Red, 100 ,y, 4 ,4);
base.OnPaint(e);
}
public void Run() {
int dx=2, dy=2;
y = 1;
while (true) {
for(int i=0; i<140; i++) {
y+=dy;
Invalidate();
Thread.Sleep(10);
}
dx = -dx; dy = -dy;
}
}
public static void Main( ) {
Application.Run(new AnimateBall());
}
}
[/csharp]