C#

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{0,0}    {100,0}
{0,50}        {150,50}

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Windows.Forms;
 
class Test : Form
{
  static void Main()
  {
    Application.Run(new Test());
  }
 
  GraphicsPath grabHandle;
  Brush pathBrush = new SolidBrush(Color.Aqua);
  Pen pathPen = new Pen(Color.Red);
 
  Test()
  {
    GraphicsPath p = new GraphicsPath();
    Point[] points = new Point[] {
      new Point(0,0),
      new Point(100,0),
      new Point(150,50),
      new Point(250,50),
      new Point(250,350),
      new Point(0,350)};
    p.AddPolygon(points);
    this.Region = new Region(p);
 
    grabHandle = new GraphicsPath();
    points = new Point[] {
      new Point(0,0),
      new Point(100,0),
      new Point(150,50),
      new Point(0,50)};
    grabHandle.AddPolygon(points);
  }
 
  protected override void OnPaint(PaintEventArgs e)
  {
    base.OnPaint(e);
 
    Graphics g = e.Graphics;
    g.FillPath(pathBrush, grabHandle);
    g.DrawPath(pathPen, grabHandle);
  }
}