Indicator to determine Swing high/low for Fibonacci Trading?

I am looking for an indicator that can determine the Swing High and Swing Low to draw my Fibonacci Lines from. Anyone care to share what they use?

This isn't easy as everyone seems to have a different idea of what constitutes a Swing High or Swing Low. The best I have seen from a coding point of view is Tom Demark's Trend Lines which connects the previous 2 Swing Highs/Lows. Here is a link to the description - it is very easy to understand and code.

http://forex-strategies-revealed.com.../user/TDTL.pdf