How can i pad the edges of a rectangle with points?

private Point RectStartPoint;
private Image img;
private Image imgClone;
private Pen myPen;
private n = 10; //number of points

이러한 개체를 초기화해야합니다.

public Form1()
    {
        InitializeComponent();

        myPen = new Pen(Brushes.Red, 2);
        //Bitmap to hold the picturebox image
        img = new Bitmap(pictureBox1.Width, pictureBox1.Height);
        Graphics g;
        using (g = Graphics.FromImage(img))
        {
            g.DrawImage(imageOfPicturebox, 0, 0, pictureBox1.Width, pictureBox1.Height);
        }

        //image to hold the original picturebox. We need it to clear img to the original 
        //picturebox image
        imgClone = (Bitmap)img.Clone();

        //We draw always on img and then we invalidate
        pictureBox1.Image = img;
    }

private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
    {
        RectStartPoint = e.Location;
    }

    private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left && e.Location != RectStartPoint)
        {
            DrawRectangle(e.Location);
        }
    }

    private void DrawRectangle(Point pnt)
    {
        Graphics g = Graphics.FromImage(img);
        int width, height, i, x, y;

        g.SmoothingMode = SmoothingMode.AntiAlias;

        //Clear img from the rectangle we drawn previously
        g.DrawImage(imgClone, 0, 0);


        if (pnt.X == RectStartPoint.X || pnt.Y == RectStartPoint.Y)
        {
            g.DrawLine(myPen, RectStartPoint.X, RectStartPoint.Y, pnt.X, pnt.Y);
        }
        else
        {
            g.DrawRectangle(myPen, Math.Min(RectStartPoint.X, pnt.X), Math.Min(RectStartPoint.Y, pnt.Y),
                            Math.Abs(RectStartPoint.X - pnt.X), Math.Abs(RectStartPoint.Y - pnt.Y));

            //width of spaces between points
            width = (int)((Math.Abs(RectStartPoint.X - pnt.X)) / (n - 1));
            //height of spaces between points
            height = (int)((Math.Abs(RectStartPoint.Y - pnt.Y)) / (n - 1));
            //we always want the upper left x, y coordinates as a reference drawing clockwise
            x = Math.Min(RectStartPoint.X, pnt.X);
            y = Math.Min(RectStartPoint.Y, pnt.Y);

            //Drawing the points. change the 3, 6 values for larger ones
             for (i = 0; i < n - 1; i++)
            {
                //Up side
                g.FillEllipse(Brushes.Green, new Rectangle(x - 3, Math.Min(RectStartPoint.Y, pnt.Y) - 3, 6, 6));
                //Right side
                g.FillEllipse(Brushes.Green, new Rectangle(Math.Min(RectStartPoint.X, pnt.X) + Math.Abs(RectStartPoint.X - pnt.X) - 3, y - 3, 6, 6));
                //Bottom side
                g.FillEllipse(Brushes.Green, new Rectangle(x - 3, Math.Min(RectStartPoint.Y, pnt.Y) + Math.Abs(RectStartPoint.Y - pnt.Y) - 3, 6, 6));
                //Left side
                g.FillEllipse(Brushes.Green, new Rectangle(Math.Min(RectStartPoint.X, pnt.X) - 3, y - 3, 6, 6));

                x += width;
                y += height;
            }
            g.FillEllipse(Brushes.Green, new Rectangle(Math.Min(RectStartPoint.X, pnt.X) + Math.Abs(RectStartPoint.X - pnt.X) - 3, 
                          Math.Min(RectStartPoint.Y, pnt.Y) - 3, 6, 6));
            g.FillEllipse(Brushes.Green, new Rectangle(Math.Min(RectStartPoint.X, pnt.X) + Math.Abs(RectStartPoint.X - pnt.X) - 3,
                         Math.Min(RectStartPoint.Y, pnt.Y) + Math.Abs(RectStartPoint.Y - pnt.Y) - 3, 6, 6));
        }

        g.Dispose();

        //draw img to picturebox
        pictureBox1.Invalidate();
    }