Bitmap cursor;
		Graphics gCursor;

		Bitmap canvas;
		Graphics gPaint;

		bool isPainting = false;

		public MainForm()
		{
			InitializeComponent();

			this.DoubleBuffered = true;

			this.MouseMove += new MouseEventHandler(mouseMove);
			this.MouseDown += new MouseEventHandler(mouseDown);
			this.MouseUp += new MouseEventHandler(mouseUp);

			canvas = new Bitmap(this.Width, this.Height);
			gPaint = Graphics.FromImage(canvas);

			cursor = new Bitmap(this.Width, this.Height);
			gCursor = Graphics.FromImage(cursor);

		}

		protected override void OnPaint(PaintEventArgs e)
		{

			gCursor.Clear(Color.Transparent);

			Point p = PointToClient(Cursor.Position);

			if (isPainting)
			{
				gPaint.FillRectangle(Brushes.Black, new Rectangle(p.X - 20, p.Y - 20, 40, 40));
			}

			gCursor.FillRectangle(Brushes.Black, new Rectangle(p.X - 20, p.Y - 20, 40, 40));
			gCursor.DrawRectangle(Pens.Red, new Rectangle(p.X - 20, p.Y - 20, 39, 39));

			e.Graphics.DrawImage(canvas, Point.Empty);
			e.Graphics.DrawImage(cursor, Point.Empty);
		}

		private void mouseMove(object sender, MouseEventArgs e)
		{
			this.Invalidate();
		}

		private void mouseDown(object sender, MouseEventArgs e)
		{
			isPainting = true;
		}

		private void mouseUp(object sender, MouseEventArgs e)
		{
			isPainting = false;
		}