Cropping Images

using System.Drawing;
using System.Windows.Forms;
using gfoidl.Imaging;

namespace WindowsFormsApplication1
{
	public partial class Form1 : Form
	{
		private Image _originalImage;
		private bool _selecting;
		private Rectangle _selection;
		//---------------------------------------------------------------------
		public Form1()
		{
			InitializeComponent();
		}
		//---------------------------------------------------------------------
		private void Form1_Load(object sender, System.EventArgs e)
		{
			// Save just a copy of the image on no reference!
			_originalImage = pictureBox1.Image.Clone() as Image;
		}
		//---------------------------------------------------------------------
		private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
		{
			// Starting point of the selection:
			if (e.Button == MouseButtons.Left)
			{
				_selecting = true;
				_selection = new Rectangle(new Point(e.X, e.Y), new Size());
			}
		}
		//---------------------------------------------------------------------
		private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
		{
			// Update the actual size of the selection:
			if (_selecting)
			{
				_selection.Width = e.X - _selection.X;
				_selection.Height = e.Y - _selection.Y;

				// Redraw the picturebox:
				pictureBox1.Refresh();
			}
		}
		//---------------------------------------------------------------------
		private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
		{
			if (e.Button == MouseButtons.Left && _selecting)
			{
				// Create cropped image:
				Image img = pictureBox1.Image.Crop(_selection);

				// Fit image to the picturebox:
				pictureBox1.Image = img.Fit2PictureBox(pictureBox1);

				_selecting = false;
			}
		}
		//---------------------------------------------------------------------
		private void pictureBox1_Paint(object sender, PaintEventArgs e)
		{
			if (_selecting)
			{
				// Draw a rectangle displaying the current selection
				Pen pen = Pens.GreenYellow;
				e.Graphics.DrawRectangle(pen, _selection);
			}
		}
		//---------------------------------------------------------------------
		private void button1_Click(object sender, System.EventArgs e)
		{
			pictureBox1.Image = _originalImage.Clone() as Image;
		}
	}
}