Graphics Draw Do/Undo

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C#

C#4.0

graphics

Good day all!!! I have a for with a picture box on it. I want to custom draw graphics to the image based on the checked radiobutton from a list of 15 radiobuttons. The graphic could either be a shape of text. I have managed to do this but now I'm stuck at how to implement a undo button for the graphics that are drawn to the image.

I have the following code which I used to just draw a rectange:

    public interface ICommand
    {
        void Do();
        void Undo();
    }

    public class SquareCommand : ICommand
    {
        private Point _point;
        private Bitmap _bitmap;
        private Graphics _graphics;
        private Color _color;

        public SquareCommand(Bitmap bitmap, Color color, int x, int y)
        {
            _bitmap = bitmap;
            _graphics = Graphics.FromImage(_bitmap);
            _color = color;
            _point = new Point(x, y);
        }

        public void Do()
        {
            SaveCurrentPixels();

            _graphics.DrawRectangle(new Pen(Color.Red, 2), new Rectangle(_point.X - (Width / 2), _point.Y - (Height / 2), Width, Height));
        }

        private const int Width = 8;
        private const int Height = 8;

        private IList<Color> _colors = new List<Color>();

        private void SaveCurrentPixels()
        {
            for (var i = _point.X - (Width / 2) - 2; i < _point.X + (Width / 2) + 2; i++)
            {
                for (var j = _point.Y - (Height / 2) - 2; j < _point.Y + (Height / 2) + 2; j++)
                {
                    _colors.Add(_bitmap.GetPixel(i, j));
                }
            }
        }

        /// <summary>
        /// Perform Undo by restoring back the pixels to previous colors
        /// </summary>
        public void Undo()
        {
            var ix = 0;
            for (var i = _point.X - (Width / 2) - 2; i < _point.X + (Width / 2) + 2; i++)
            {
                for (var j = _point.Y - (Height / 2) - 2; j < _point.Y + (Height / 2) + 2; j++)
                {
                    _bitmap.SetPixel(i, j, _colors[ix++]);
                }
            }
        }
    }


//usage



        private void Dependant_Marker_MouseDown(object sender, MouseEventArgs e)
        {
            ICommand command = null;
            command = new SquareCommand(_bitmap, Color.Red, e.X, e.Y);
            command.Do();

            _commandStack.Push(command);

            Dependant_Marker.Refresh();
        }

        private void btnUndoMarker_Click(object sender, EventArgs e)
        {
            if (_commandStack.Count > 0)
            {
                var lastCommand = _commandStack.Pop();

                lastCommand.Undo();
            }

            Dependant_Marker.Refresh();
        }

        private void btnClearMarker_Click(object sender, EventArgs e)
        {
            while (_commandStack.Count > 0)
            {
                _commandStack.Pop().Undo();
            }

            Dependant_Marker.Refresh();
        }

But now I want it to work with shapes and text:

public void Do(RadioButton cmd)
{
    SaveCurrentPixels();

    switch (cmd.Text)
    {
        case "Filling":
            _graphics.FillRectangle(new SolidBrush(Color.Blue), new Rectangle(_point.X - 11, _point.Y - 11, 22, 22));
            break;
        case "Unerupted":
            _graphics.DrawLine(new Pen(Color.Blue, 3), _point.X - 2, _point.Y - 20, _point.X - 2, _point.Y + 20);
            _graphics.DrawLine(new Pen(Color.Blue, 3), _point.X + 2, _point.Y - 20, _point.X + 2, _point.Y + 20);
            break;
        case "Extracted":
            _graphics.DrawLine(new Pen(Color.Blue, 3), _point.X - 20, _point.Y - 20, _point.X + 20, _point.Y + 20);
            _graphics.DrawLine(new Pen(Color.Blue, 3), _point.X + 20, _point.Y - 20, _point.X - 20, _point.Y + 20);
            break;
        case "Caries":
            _graphics.FillRectangle(new SolidBrush(Color.Red), new Rectangle(_point.X - 11, _point.Y - 11, 22, 22));
            break;
        case "To Extract":
            _graphics.DrawLine(new Pen(Color.Red, 3), _point.X - 20, _point.Y - 20, _point.X + 20, _point.Y + 20);
            break;
        case "Ag.":
            _graphics.DrawString("Ag.", new Font("Arial", 11, FontStyle.Bold), new SolidBrush(Color.Green), _point);
            break;
        case "G.":
            _graphics.DrawString("G.", new Font("Arial", 11, FontStyle.Bold), new SolidBrush(Color.Green), _point);
            break;
        case "S.":
            _graphics.DrawString("S.", new Font("Arial", 11, FontStyle.Bold), new SolidBrush(Color.Green), _point);
            break;
        case "S.C.":
            _graphics.DrawString("S.C.", new Font("Arial", 11, FontStyle.Bold), new SolidBrush(Color.Green), _point);
            break;
        case "G.C.":
            _graphics.DrawString("G.C.", new Font("Arial", 11, FontStyle.Bold), new SolidBrush(Color.Green), _point);
            break;
        case "P.V.C":
            _graphics.DrawString("P.V.C", new Font("Arial", 11, FontStyle.Bold), new SolidBrush(Color.Green), _point);
            break;
        case "R.C.":
            _graphics.DrawString("R.C.", new Font("Arial", 11, FontStyle.Bold), new SolidBrush(Color.Green), _point);
            break;
        case "A.C.":
            _graphics.DrawString("A.C.", new Font("Arial", 11, FontStyle.Bold), new SolidBrush(Color.Green), _point);
            break;
        case "P.":
            _graphics.DrawString("P.", new Font("Arial", 11, FontStyle.Bold), new SolidBrush(Color.Green), _point);
            break;
        case "M.":
            _graphics.DrawString("M.", new Font("Arial", 11, FontStyle.Bold), new SolidBrush(Color.Green), _point);
            break;
    }
}

Thanx in advance...