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Using a wide pen, how do I draw a series of line segments with rounded corners

Platform: WinForms| Category: Pens

The LineJoin property of the Pen class allows you to specify how two lines should be joined. The following code segment produces the picture below.

  private void Form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
  {
    Pen redPen = new Pen(Color.Red, 20);
      
    int startX = 20;
    int startY = 60;
    int width = this.ClientSize.Width / 17;
    int height = this.ClientSize.Height / 2;

    foreach(LineJoin LJ in new LineJoin[] { LineJoin.Bevel,
                         LineJoin.Miter,
                         LineJoin.Round})
    {
      redPen.LineJoin = LJ;

      Point[] points = {new Point(startX, startY),
                  new Point(startX + width, startY + height),
                  new Point(startX + 2 * width, startY),
                  new Point(startX + 3 * width, startY + height),
                  new Point(startX + 4 * width, startY)};

      e.Graphics.DrawLines(redPen, points);
      e.Graphics.DrawString( LJ.ToString(), new Font('Arial Black', 13), 
        new SolidBrush(Color.Blue), startX - 5, startY - 50);
      startX += 4 * width + 40;
    }
  }

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