Drawing a line in strategy at the value of an indicator

[AgriTrdr]

Hi,

I would like to draw a line in my Strategy, but the value of the line should be the value of the indicator.

Are there examples out there or this would be a good place for it?

Thanks

[NinjaTrader_ChelseaB]

Hello AgriTrdr,

This would be possible using Draw.Line() or Draw.HorizontalLine().

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

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

For example to draw at the price of a 14 SMA:

if (CurrentBar > 10) // we'll draw the line over the last 10 bars.
Draw.Line(this, "tag1", false, 10, SMA(14)[0], 0, SMA(14)[0], Brushes.LimeGreen, DashStyleHelper.Dot, 2);

Also, below is a link to a forum post with helpful resources on getting started with NinjaScript and C#.

https://support.ninjatrader.com/s/article/Developer-Guide-Getting-Started-with-NinjaScript

[AgriTrdr]

So where you call "SMA(14)[0]", is the place where the indicator setting from what would be in a strategy State.Dataloaded would go?

[NinjaTrader_ChelseaB]

Hello AgriTrdr,

This is correct, calling the indicator would return the price for the plot as a double for that barsAgo index.

This would be the startY and EndY parameters.

Draw.Line(NinjaScriptBase owner, string tag, int startBarsAgo, double startY, int endBarsAgo, double endY, Brush brush)

[AgriTrdr]

If this was on a secondary data series, would it be:

if (CurrentBars[1] > 10) // we'll draw the line over the last 10 bars.
Draw.Line(this, "tag1", false, 10, [B]SMA(BarrsArray[1], 14)[0][/B], 0, [B]SMA(BarrsArray[1], 14)[0][/B], Brushes.LimeGreen, DashStyleHelper.Dot, 2);​

[NinjaTrader_ChelseaB]

Hello AgriTrdr,

Drawing objects can only be drawn on the primary series, but you can use data from other series.

The code you've suggested should work.

[bobperez]

Hi Chelsea,

Once a line is drawn how can any point of the line be accessed? For example, if Close[0] >= the equivalent to Line[0], do something. So, how can Line[0] be called?

Thanks,

Bob Perez

[NinjaTrader_ChelseaB]

Hello Bob,

You can assign the drawing object to a variable and then access this from the variable. The help guide has sample code.

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

Line myLine = Draw.Line(this, "tag1", false, 10, SMA(14)[0], 0, SMA(14)[0], Brushes.LimeGreen, DashStyleHelper.Dot, 2);

Print(myLine.StartAnchor.Price);

[bobperez]

Chelsea,

Can the line be accessed from the script if drawn manually by the user?

[NinjaTrader_ChelseaB]

Hello bobperez,

Yes, you can loop through the DrawObjects collection. The help guide provides sample code.

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

[bobperez]

Thank you.

[bobperez]

Hello bobperez,

Yes, you can loop through the DrawObjects collection. The help guide provides sample code.
https://ninjatrader.com/support/help...rawobjects.htm

Chelsea,

How can I programmatically detect when a user-drawn line has been crossed over, either above or below it?

Bob

[NinjaTrader_ChelseaB]

Hello Bob,

From a script, you would need to calculate the y-intercept of the object and use this to determine if the price is greater or less than the y-intercept on this bar and is less than or greater on the previous bar.

There is an example of calculating the y-intercept.

https://forum.ninjatrader.com/forum/ninjatrader-8/add-on-development/107312-price-crossing-a-line#post828663

[bobperez]

Thank you

Bob