Indicator: drawing under "OnRender"

[artson]

Hi,

I'm trying to draw different geometries and text, which I cannot do properly with "Draw.Line" giving only price and bar coordinates.

I've learnt, that this can be done under "OnRender" using screen coordinates instead pirce and bar.
Please confirm me if there is another method or posibility to do it.

My question now is, when will be this "OnRender" be activated?
The indicator can be updated at the end of each bar, for example, but when will be updated this "OnRender".
I know that I should't use too many calculations inside OnRender, but thera are some variables, which I need from the screen, thus I have to do this calculations inside OnRender.

Maybe you can give some tips or examples in order to understand it better.

Thanks in advance!

[NinjaTrader_BrandonH]

Hello artson,

Thank you for your post.

That is correct. SharpDX methods could be used to render objects on a chart window with OnRender(). The OnRender() method frequently runs once the State has reached State.Realtime in response to market data updates or a user interacting with the chart (e.g., clicking, resizing, rescaling, etc.). For performance optimizations, the timing of the calls to OnRender() are buffered to at least 250ms, and re-renders once internal logic determines that values may be out-of-date.

Please see the help guide documentation below for more information about using SharpDX for custom chart rendering. Also, see the SampleCustomRender script that comes default with NinjaTrader for an example of how to use SharpDX and OnRender().

To view the SampleCustomRender script, open a New > NinjaScript Editor window, double-click the Indicators folder, then select SampleCustomRender to view the code.

Using SharpDX for Custom Chart Rendering - https://ninjatrader.com/support/help..._rendering.htm
OnRender() - https://ninjatrader.com/support/help...8/onrender.htm

Please let us know if we may assist further.

[artson]

Thanks Brandon,

So, it is not possible to "control" when or how often the OnRender will be processed?

[NinjaTrader_BrandonH]

Hello artson,

Thank you for your note.

That is correct, OnRender() is controlled by internal logic. OnRender is called on a 250ms timer on charts and additionally called anytime the visuals are invalidated e.g., resizing the screen or adding and removing indicators for example.

Please let us know if we may assist further.

[artson]

Perfect!
Thanks a lot!!