Overlapping and interconnected Regions

[ryanswood]

Hello,

I am working on building an indicator to plot zones for a given day that are read from a file that matches the instrument + date stamp. See attached screenshot of the general idea of how I would imagine the plots to look.

I planned on using Draw.Region since it seemed to handle historical and future plots. Each day is expected to be a separate region. I don't want any interconnected lines between different days zones. My understanding of the documentation for Region is that if I supplied a unique tag a new region would be created otherwise the existing region with the same tag would be modified.

I am seeing behavior that leads me to think my understanding of the above is incorrect or my usage is incorrect (See overlapping_zones.png):
- Subsequent day's zones all start from the first day's zones. Note that the opacity increases and that Day 2's zones have a red border and start from Day 1.
- Zones connect in the midst a missing day (Day 3)

I now suspect that using ISeries to store the data is what is causing all the regions to start from the first bar plotted.

Code here for syntax highlighting: https://pastebin.com/Lb7Y5wP1

--Ryan

[ryanswood]

Resetting zone1a through zone12b to a new Series after line 179 made it work, but still feel like I am using the wrong drawing tool. I see how Drawing.Line takes doubles as arguments, but I want a shaded region since it is visually more obvious.

Is there any performance harm to re-initializing a new Series once a new day is encountered?

[NinjaTrader_Jim]

Hello ryanswood,

Thanks for opening the thread.

Draw.Region() takes a Series<double> as input to create an amorphous shape that fills the region between the bounds of the Series<double>'s. For example, a region can be used to create a cloud over the region between the High and Low values of a chart.

Looking at your code, you are loading some data and adding it to the current bar for the associated Series<double>. This creates a Series<double> with all of the necessary points with each iterating OBU. Without breaking off the previous data from a previous day by resetting the Series<double>, you will include the previous region in your shape.

If you want to use Draw.Region(), resetting the Series<double> will be necessary to break off a new shape. If you only want to focus on rectangles, and not consider any amorphous shapes, I would suggest to use Draw.Rectangle() instead. This way, so you can manage your shapes using a fixed number of doubles rather than Series<double>'s to reduce memory footprint.

Draw.Rectangle() - https://ninjatrader.com/support/help..._rectangle.htm

Please let me know if I can be of further assistance.

[ryanswood]

Thank you for the background on Region. It makes total sense and is now obvious. I was able to use Rectangle instead after a few attempts of the various method signatures. The code is much cleaner and shorter. Thank you.