How to get a series from a drawobject

[learningnt]

I'm currently working on an indicator. As a part of that indicator, I have a Line and a TrendChannel being drawn. I want to use CrossAbove and CrossBelow to play a sound to alert the user of a specific change. However, I can't seem to figure out how to get a series from Line or TrendChannel in order to use CrossAbove and CrossBelow. Any help would be greatly appreciated.

[NinjaTrader_ChelseaB]

Hello learningnt,

Drawing objects don't have series and don't have plots. They have anchors. These are the same anchors you see in the Draw Objects window in the Data section.

The DrawObjects() page in the help guide has an example.

https://ninjatrader.com/support/helpGuides/nt8/en-us/drawingtools_drawobjects.htm

[learningnt]

Thanks for the info, Chelsea. However, if that's the case, how am I supposed to do something like this:

...
if (CrossAbove(High, <Line or TrendChannel>, 1)) { <do something>; }
else if (CrossBelow(Low, <Line or TrendChannel>, 1)) { <do something else>; }
...

I do see from the documentation that there are two choices for arguments with CrossAbove and CrossBelow:

CrossAbove(ISeries<double> series1, ISeries<double> series2, int lookBackPeriod)
CrossAbove(ISeries<double> series1, double value, int lookBackPeriod)

CrossBelow(ISeries<double> series1, ISeries<double> series2, int lookBackPeriod)
CrossBelow(ISeries<double> series1, double value, int lookBackPeriod)

Since I can't get a series from the Draw Object, how do I get the value of that draw object at the same point in time of X bars ago?

[NinjaTrader_ChelseaB]

Hello learningnt,

CrossAbove()/CrossBelow() could check when the price is crossing a specific anchor but not a point along the line.

The Alerts for manually drawn lines indicator for NinjaTrader 7 had custom logic to figure out when the price was crossing diagonal lines that are not horizontal.

https://ninjatraderecosystem.com/user-app-share-download/alert-for-manually-drawn-lines/

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[learningnt]

So, when creating a Line or TrendChannel, we choose anchor points on either end, and it draws a line between those anchor points. This then makes it impossible to tell if we have crossed above or below that Line or TrendChannel as we're talking about some point between anchors and not the anchors themselves. Am I interpreting that correctly? Also, I'm using NT8, not NT7.

[NinjaTrader_ChelseaB]

Hello learningnt,

That would be correct.

You have the anchors and you would need to determine the slope and intercept as demonstrated in the logic of the LineAlert indicator I have linked you.

Its possible to do but requires custom logic.