How to draw Fibonacci from Zig Zag when BoS occur

[calcassa]

From image below.
Once observed BoS on the uptrend, I'd like to draw Fibonacci from L1 to Hi1 of the first.

What parameters that I have to put on time (1) Price (1) and time (2) Price (2) for accurate Fibonacci?

[jstap]

Yes that is how you draw accurate Fibonacci, but how are you determining (or how is EA determining) the high and low candle ID's?