Create a Region object, cut a rectangular hole in it, and fill it : Region : Drawing 2D C# Examples

    
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  r  =  new  Region(new  Rectangle(30,  30,  30,  60));
        r.Exclude(new  Rectangle(40,  40,  10,  10));
        g.FillRegion(Brushes.Orange,  r);
        Console.WriteLine("This  Region:  ");
        Console.WriteLine(r.IsInfinite(g)  ?  "  -  is  infinite"  :  "  -  is  finite");
        Console.WriteLine(r.IsEmpty(g)  ?  "  -  is  empty"  :  "  -  is  non-empty");

        PointF  pf  =  new  PointF(35.0f,  30.0f);
        Console.WriteLine((r.IsVisible(pf)  ?  "  -  includes"  :  "  -  excludes")  +  "  the  point  (35.0,  50.0)");

        Rectangle  rect  =  new  Rectangle(25,  65,  15,  15);
        g.DrawRectangle(Pens.Black,  rect);
        Console.WriteLine((r.IsVisible(rect)  ?  "  -  is  visible"  :  "  -  is  invisible")  +  "  in  the  rectangle  shown");

        r.Dispose();
        }
        public  static  void  Main()  {
                Application.Run(new  Form1());
        }
}