using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Collections; using System.ComponentModel; using System.Windows.Forms; using System.Data; using System.Drawing.Imaging; public class Form1 : System.Windows.Forms.Form { public Form1() { InitializeComponent(); } private void InitializeComponent() { this.AutoScaleBaseSize = new System.Drawing.Size(5, 13); this.ClientSize = new System.Drawing.Size(292, 273); this.Text = ""; this.Resize += new System.EventHandler(this.Form1_Resize); this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint); } static void Main() { Application.Run(new Form1()); } private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e) { Graphics g = e.Graphics; g.FillRectangle(Brushes.White, this.ClientRectangle); Region reg = new Region(); reg.MakeEmpty(); GraphicsPath gp = new GraphicsPath(); gp.AddEllipse(10, 10, 50, 50); reg.Union(gp); gp.Reset(); gp.AddLine(40, 40, 70, 10); gp.AddLine(70, 10, 140, 140); gp.CloseFigure(); reg.Union(gp); reg.Union(new Rectangle(40, 50, 60, 60)); // Set the clipping region g.SetClip(reg, CombineMode.Replace); g.FillRectangle(Brushes.Green, this.ClientRectangle); gp.Dispose(); reg.Dispose(); } private void Form1_Resize(object sender, System.EventArgs e) { Invalidate(); } }