C#

public interface IDrawable<br />
	{<br />
		void Draw( Graphics g );<br />
		int CountNo(ArrayList al);<br />
	}<br />
<br />
	public class Ellipse : IDrawable<br />
	{<br />
		public Color c = Color.Black;<br />
		public Point l = new Point(0, 0);<br />
		public Size s = new Size(0, 0);<br />
		public int stroke = 0;<br />
<br />
		public Ellipse( Color c, Point l, Size s, int stroke )<br />
		{<br />
			this.c = c;<br />
			this.l = l;<br />
			this.s = s;<br />
			this.stroke = stroke;<br />
		}<br />
	<br />
		public void Draw( Graphics g )<br />
		{<br />
			g.DrawEllipse( new Pen( c, stroke ), l.X ,l.Y, s.Width,s.Height );<br />
		}

<br />
private ArrayList alDrawingObjects = new ArrayList();<br />
.......<br />
alDrawingObjects.Add( new Rect( Color.Black, new Point(pt.X, pt.Y), new Size(50, 50), 5 ) );<br />
alDrawingObjects.Add( new Rect( Color.Black, new Point(pt.X, pt.Y), new Size(50, 50), 5 ) );<br />
.......<br />
private void form1_Paint(object sender, System.Windows.Forms.PaintEventArgs e)<br />
		{<br />
			Graphics objGraphics ; <br />
			//You can't modify e.Graphics directly.<br />
			objGraphics = e.Graphics;<br />
			foreach ( IDrawable d in alDrawingObjects )<br />
			{<br />
				d.Draw( objGraphics );<br />
			}<br />
			// Free up resources.<br />
			objGraphics.Dispose();<br />
		}