Updating PlotBrushes

[rokups]

Hi,
How do i correctly update PlotBrushes? Samples indicate that i can just set them in OnbarUpdate, however this does not always work. For example, if i use my indicator as an input to another indicator then i get "Indicator 'MyIndicator': Error on calling 'OnBarUpdate' method on bar 0: The calling thread cannot access this object because a different thread owns it." error. Using Dispatcher.Invoke makes things very slow. Using Dispatcher.InvokeAsync seems to apply color to the wrong bar, no matter how i try to do it (probably my mistake, but still it is not clear how to do it correctly).

[NinjaTrader_Jesse]

Hello rokups,

What specific code are you trying to execute and where is it being executed from in that use case? Do you have a sample that you can provide?

[rokups]

I modified MACD indicator to display a colored histogram. See attached file.

[NinjaTrader_Jesse]

Hello rokups,

You need to freeze the brushes you are making. You can read about using brushes in the link below, from that link:

Warning: If you do not call .Freeze() on a custom defined brush WILL eventually result in threading errors should you try to modify or access that brush after it is defined.

Note: Anytime you create a custom brush that will be used by NinjaTrader rendering it must be frozen using the .Freeze() method due to the multi-threaded nature of NinjaTrader.

https://ninjatrader.com/support/helpGuides/nt8/working_with_brushes.htm

[rokups]

Seems to work. Thank you.