How to Fit image (stratch) with this functionality ???

Question

i have an pictureBox with panning features, but i i want to add fit image feature like stratch image ,, how can i do this ???

code is here ..

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Windows.Forms;

namespace PanningImageDemo

{

    public partial class Form1 : Form

    {

        private Point startingPoint = Point.Empty;

        private Point movingPoint = Point.Empty;

        private bool panning = false;

        Image img;

        public Form1()

        {

            InitializeComponent();

        }

        private void Form1_Load(object sender, EventArgs e)

        {

            img = Image.FromFile("D:\\Drawings\\dwg\\638.tif");

            pictureBox1.Size = img.Size;

        }

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)

        {

            panning = true;

            startingPoint = new Point(e.Location.X - movingPoint.X, e.Location.Y - movingPoint.Y);

        }

        private void pictureBox1_MouseUp(object sender, MouseEventArgs e)

        {

            panning = false;

        }

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)

        {

            if (panning)

            {

                movingPoint = new Point(e.Location.X - startingPoint.X, e.Location.Y - startingPoint.Y);

                pictureBox1.Refresh();

                //pictureBox1.Invalidate();

            }

        }

        private void pictureBox1_Paint(object sender, PaintEventArgs e)

        {

            e.Graphics.DrawImage(img, movingPoint);

        }

    }

}

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