Feature Request: Adding “Snap to Extreme” to Fibonacci Retracements Drawing Tool

[chrishyewll]

Hi, I'm transfering my working NT7 indicator to NT8. The indicator will create 2x buttons next to the chart. When click "Fib Up", it will use the most recent 2 completed bar to draw Fibonacci Retrancement up. vici-versal. But I have issue with High[0] and Low[0] that does not reflect the High and Low of the most recent completed bar. When check these two value in OnBarUpdate(), it will reflect correctly. But if check the same High[0] and Low[0] when software enter routine Button_Click(), the High[0] and Low[0] does not reflect the right value. When check the Bars.GetTime, it showed it was looking at bar at Sep instead of today's bar.
Can anyone advise how to get the righ High & Low of the most recent 3 buttons?

[NinjaTrader_ChrisL]

Hi chrishyewll, thanks for writing in.

You will need to use TriggerCustomEvent in the button event to sync the data on the instrument thread with the UI thread. See the documentation here for some examples:

https://ninjatrader.com/support/helpGuides/nt8/NT%20HelpGuide%20English.html?triggercustomevent.htm

Kind regards,
-ChrisL

[chrishyewll]

Thanks, ChrisL! I will try the method.

[chrishyewll]

Thanks, ChrisL! I will try the method.

Hi ChrisL, sorry for the late updates. Yes, your advice above worked well. Thanks!

-Chris

[chrishyewll]

Now I met a new problem on the same script (migrating from working NT7 to NT8). I use a customized button to start the entry-seeking process in a zone (evaluate inside 'OnBarUpdate'). When it found an entry, it will use ATM to park entry requests. Once parked (before market reach to take out the entry), it will clear the button color and text to show that the request already turned to actual entry request.

The problem now is that when it tries to change button color (inside routine ClearZoneFlags), the script crash with the error "Error on calling 'OnBarUpdate' method on bar 59561: The calling thread cannot access this object because a different thread owns it." Please see pic below. Any suggestion on how do I able to solve this? Thanks.

[NinjaTrader_ChrisL]

Hi, Its the same problem as the issue above. You need to use TriggerCustomEvent to access the buttons on the UI thread.

Best regards,
-ChrisL

[chrishyewll]

Noted, thanks, ChrisL!