Hello 91Franc,
Firstly are you talking Fibonacci Retracements? (there is also Fan / Timezone / Expansion)
Currently in jforex - Fibonacci is drawing tool and is not available to be called upon by visual jforex at the moment. Usually you would draw from the low to the high, or high to the low - depending on last movement.
You could potentially do this mathematically- So my example would be a 61.8% retracement - you could build a Calculation Expression as follows:
The output would be the value for the 61.8% retracement. You would also need an IF block to check if the HIGH or the LOW was closest to current time (to tell the direction of the retracement) - that would change the math of the Calculation Expression. Mine is for the current move being up - so its a downwards move retracement.
Good luck - and let me know if you need me to help more =)