Draw Line

[jr123]

I'm new with ninja script and try my first exercises ...
I will draw a line in the chart , but it does't work...

I use this code (the example from NT8 helpGuide) :

...
protected override void OnBarUpdate()
{
Draw.Line(this, "tag1", false, 10, 12000, 0, 12020, Brushes.LimeGreen, DashStyleHelper.Dot, 2);
}
....

but nothing hapens..
there is no line on the chart @ 12000

the example for a horizontal line :

Draw.HorizontalLine(this, "tag1", 1000, Brushes.Black);

works perfectly...

what is wrong ?
thanks for any answer...

[NinjaTrader_ChelseaB]

Hello jr123,

I'm seeing that you are referring to NinjaTrader 8 and I have moved your thread from the NinjaTrader 7 Indicator Development section on the forums over to the NinjaTrader 8 Indicator Development section of the forums.

I've added the line of code to a script and tested but I am not able to reproduce your results.

https://www.screencast.com/t/b2RrEFe8

[jr123]

still no line

Thank you for the answer...

but same Video from me :

https://www.screencast.com/t/iWTuaklZBrUi

but still there is no line ...

I have try this with Fdax and with ES like you...
no line

what is wrong ?

[jr123]

i have try the same thing with another PC. NT8 new installed.
Draw.Line still doesn't work. Why ?

#region Using declarations
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Input;
using System.Windows.Media;
using System.Xml.Serialization;
using NinjaTrader.Cbi;
using NinjaTrader.Gui;
using NinjaTrader.Gui.Chart;
using NinjaTrader.Gui.SuperDom;
using NinjaTrader.Gui.Tools;
using NinjaTrader.Data;
using NinjaTrader.NinjaScript;
using NinjaTrader.Core.FloatingPoint;
using NinjaTrader.NinjaScript.DrawingTools;
#endregion

//This namespace holds Indicators in this folder and is required. Do not change it. 
namespace NinjaTrader.NinjaScript.Indicators
{
	public class DrawLineTest : Indicator
	{
		protected override void OnStateChange()
		{
			if (State == State.SetDefaults)
			{
				Description									= @"Enter the description for your new custom Indicator here.";
				Name										= "DrawLineTest";
				Calculate									= Calculate.OnBarClose;
				IsOverlay									= true;
				DisplayInDataBox							= true;
				DrawOnPricePanel							= true;
				DrawHorizontalGridLines						= true;
				DrawVerticalGridLines						= true;
				PaintPriceMarkers							= true;
				ScaleJustification							= NinjaTrader.Gui.Chart.ScaleJustification.Right;
				//Disable this property if your indicator requires custom values that cumulate with each new market data event. 
				//See Help Guide for additional information.
				IsSuspendedWhileInactive					= true;
			}
			else if (State == State.Configure)
			{
			}
		}

		protected override void OnBarUpdate() 
		{
			Draw.Line(this, "tag1", false, 10, 12000, 0, 12020, Brushes.LimeGreen, DashStyleHelper.Dot, 2);
		}
	}
}

#region NinjaScript generated code. Neither change nor remove.

namespace NinjaTrader.NinjaScript.Indicators
{
	public partial class Indicator : NinjaTrader.Gui.NinjaScript.IndicatorRenderBase
	{
		private DrawLineTest[] cacheDrawLineTest;
		public DrawLineTest DrawLineTest()
		{
			return DrawLineTest(Input);
		}

		public DrawLineTest DrawLineTest(ISeries<double> input)
		{
			if (cacheDrawLineTest != null)
				for (int idx = 0; idx < cacheDrawLineTest.Length; idx++)
					if (cacheDrawLineTest[idx] != null &&  cacheDrawLineTest[idx].EqualsInput(input))
						return cacheDrawLineTest[idx];
			return CacheIndicator<DrawLineTest>(new DrawLineTest(), input, ref cacheDrawLineTest);
		}
	}
}

namespace NinjaTrader.NinjaScript.MarketAnalyzerColumns
{
	public partial class MarketAnalyzerColumn : MarketAnalyzerColumnBase
	{
		public Indicators.DrawLineTest DrawLineTest()
		{
			return indicator.DrawLineTest(Input);
		}

		public Indicators.DrawLineTest DrawLineTest(ISeries<double> input )
		{
			return indicator.DrawLineTest(input);
		}
	}
}

namespace NinjaTrader.NinjaScript.Strategies
{
	public partial class Strategy : NinjaTrader.Gui.NinjaScript.StrategyRenderBase
	{
		public Indicators.DrawLineTest DrawLineTest()
		{
			return indicator.DrawLineTest(Input);
		}

		public Indicators.DrawLineTest DrawLineTest(ISeries<double> input )
		{
			return indicator.DrawLineTest(input);
		}
	}
}

#endregion

[NinjaTrader_ChelseaB]

Hello jr123,

Please send an email to platformsupport [at] ninjatrader [dot] com so that I may test with you on your end.

[jr123]

the answer :

It appears the script is having an error based on the data being used.

You are currently using a 10 BarsAgo value but not checking if there are 10 Bars before calling this code. On Bars 0 — 9 this code would have an error but the script would just stop processing on bar 0 because of this.

To resolve the error, please add the following code into OnBarUpdate before drawing:


protected override void OnBarUpdate()
{
if(CurrentBar < 10) return;
Draw.Line(this, "tag1", false, 10, Close[0], 0, Close[0], Brushes.LimeGreen, DashStyleHelper.Dot, 2);
}


thanks to :
Jesse ... NinjaTrader Platform Customer Service
great service !

[NinjaTrader_ChelseaB]

Hi jr123,

I overlooked that when I didn't get an error when testing.

I've given Jesse a nudge and thanks.