Background color (backBrush) of future bar

[cutzpr]

Can you change the color of the backbrush of a future bar as such. I would like to use the back brush as a signal on a future bar.

BackBrushes[-1] = backBrush; 

[NinjaTrader_Jesse]

Hello cutzpr,

There is no ability to affect future bars, are you trying to color the building bar?

[cutzpr]

No not the building bar, but future bar. I assumed it could but it makes sense since the bar isnt created yet. But cant you draw objects at locations where future bars can be located useing -1?

[NinjaTrader_Jesse]

Hello cutzpr,

Drawing objects use slots in the chart which is a little different of a concept so technically those can draw to a certain extent into the future although that is not supported in NinjaScript and has issues with rendering in certain use cases. In general there is no ability to reference future bars because they have not been processed yet. All scripts are intended to process bars as they come in and reference bars in the past that are available at the time of processing.

[cutzpr]

Could you give me an example where I could use a draw.region to mimic that of drawing a backbrush in of a future bar.

[NinjaTrader_Jesse]

Hello cutzpr,

No there is no support for drawing into the future with NinjaScript, you can with some objects technically use negative bars ago but that can also cause problems. I wouldn't be able to assist with that type of logic. If you want to draw into the future with a drawing object you can use a Ray which does a rendering projection with the chart coordinates rather than using bars. That renders to the edge of the chart so if you scroll ahead its still visible. In that use case you would use 1 bars ago as the start anchor and 0 bars ago as the end anchor to point the ray to the right.

[cutzpr]

So after some test, I noticed that if paint a future backbrush with an index in the future

BackBrushes[-1] = backBrush; 

, eventually when I get to that bar, the background is painted once that bar actually completes. Which works well for testing atleast. Could you please confirm that what I am seeing is correct?

[NinjaTrader_Jesse]

Hello cutzpr,

As mentioned there is no support for using negative bars ago in NinjaScript so that is not something I could confirm. We don't have any guidelines on that topic and that is known to produce problems by using the barsago field in unsupported ways.