Create an irregular Region add a circle to the region : Region « 2D « C# / CSharp Tutorial

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C# / CSharp Tutorial » 2D » Region 
27.11.2.Create an irregular Region add a circle to the region
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Text;
using System.Windows.Forms;

public class Form1 : Form {
    protected override void OnPaint(PaintEventArgs e) {
        Graphics g = e.Graphics;
        g.FillRectangle(Brushes.White, this.ClientRectangle);
        Region reg = new Region();
        reg.MakeEmpty();

        GraphicsPath gp = new GraphicsPath();
        gp.AddEllipse(10105050);
        reg.Union(gp);
        gp.Reset();
        gp.AddLine(40407010);
        gp.AddLine(701010040);
        gp.CloseFigure();
        reg.Union(gp);
        reg.Union(new Rectangle(40506060));
        g.SetClip(reg, CombineMode.Replace);
        g.FillRectangle(Brushes.Green, this.ClientRectangle);
        gp.Dispose();
        reg.Dispose();
    }
    public static void Main() {
        Application.Run(new Form1());
    }
}
27.11.Region
27.11.1.Region.IsVisible
27.11.2.Create an irregular Region add a circle to the region
27.11.3.Create a Region whose boundary is the above GraphicsPath
27.11.4.Create a Region object, cut a rectangular hole in it, and fill it
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