Indicator Plot Goes Blank

[symbol]

My indicator will plot initially, but then goes blank when the parameters are changed.

To replicate this error.

1) import attached indicator.

2) add the indicator to a chart with 3 data series. press the apply button. the indicator automatically detects all 3 series and adds them to the barsarray.

3) remove the 3rd indicator name from parameters. press Apply/OK. in the initialize method, the 3rd instrumnt is no longer added to the bars array.

Result: The chart fails to plot. Is this by design? How can I update the number of instruments used by the indicator?

Thanks

Code:

protected override void Initialize()
{
int barValue;

DrawOnPricePanel = false; // TRUE - Draw objects paint on price panel; FALSE - indicator panel.
Overlay = false; // TRUE - Indicator plots drawn on top of price; FALSE - Indicator drawn separate panel

Add(new Plot(Color.Black, PlotStyle.Line, "MyClose"));

barValue = Math.Max(1,base.BarsPeriod.Value);
Add(symbol2, BarsPeriod.Id, barValue);
if (symbol3!="" && symbol3!=null)
Add(symbol3, BarsPeriod.Id, barValue);

}

protected override void OnBarUpdate()
{
MyClose.Set(Close[0]);
}

#region Properties
[Browsable(false)] // this line prevents the data series from being displayed in the indicator properties dialog, do not remove
[XmlIgnore] // this line ensures that the indicator can be saved/recovered as part of a chart template, do not remove
public DataSeries MyClose
{
get { return Values[0]; }
}

private string symbol1="";
[Description("")]
[GridCategory("\t\t\t\t\tInstrument 1 Parameters")]
[Gui.Design.DisplayName ("\t\t\t\tSymbol")]
public string Symbol1
{
get
{
if (((symbol1 == "") || (symbol1 == null)) && (ChartControl != null) && (Instruments != null))
{
symbol1=ChartControl.BarsArray[0].Instrument.FullName;
}
return symbol1;
}
set
{
if((symbol1 == "") || (symbol1 == null))
{
symbol1=value;
}
}
}
private string symbol2 = @"";
[Description("")]
[GridCategory("\t\t\t\tInstrument 2 Parameters")]
[Gui.Design.DisplayName ("\t\t\t\tSymbol")]
public string Symbol2
{
get
{ // symbol2 defaults to secondary chart data series
if (((symbol2 == "") || (symbol2 == null)) && (ChartControl != null) && (Instruments != null))
{
symbol2 = ChartControl.BarsArray[1].Instrument.FullName;
}
return symbol2;
}
set { symbol2 = value; }
}

private string symbol3 = @"";
[Description("")]
[GridCategory("\t\t\t\tInstrument 3 Parameters")]
[Gui.Design.DisplayName ("\t\t\t\tSymbol")]
public string Symbol3
{
get
{ // symbol3 defaults to secondary chart data series
if (((symbol3 == "") || (symbol3 == null)) && (ChartControl != null) && (Instruments != null))
{
symbol3 = ChartControl.BarsArray[2].Instrument.FullName;
}
return symbol3;
}
set
{
// check for update Symbol3Units default...
symbol3 = value;
}
}
#endregion

[NinjaTrader_PatrickH]

Hello symbol,

Thank you for your post.

I will test this on my end, however can you advise if any error messages are seen on the Log tab of the NinjaTrader Control Center when this occurs? And if so, what do they report?

I look forward to your response.

[symbol]

Hi Patrick

Thanks for your reply. I do not get any error messages on the log prior to the chart going blank.

Nick

[NinjaTrader_PatrickH]

Hello Nick,

Thank you for your response.

I have corrected this item in your script, you can find a corrected version attached to this response.

Key items here are the following:

• Using NinjaTrader_AdamP's SpreadCandlesticks indicator you can see a few differences that needed to be applied to your indicator: http://www.ninjatrader.com/support/f...d=4&linkid=512
• I removed your null checks on several items including the Add() method for the third bar series in Initialize():
  

  barValue = Math.Max(1,base.BarsPeriod.Value);			
              Add(symbol2, BarsPeriod.Id, barValue);
  			Add(symbol3, BarsPeriod.Id, barValue);

• Each symbol except for the first one has been edited in the properties to reflect the following:
  

  get
              {   // symbol# defaults to secondary chart data series
                  if ((symbol# == "") && (ChartControl != null) && (Instruments != null))
                  {
  	                for(int i=0; i<ChartControl.BarsArray.Length; i++)
  						if (ChartControl.BarsArray[i].Instrument.FullName != Instruments[0].FullName)
  						{
  							symbol# = ChartControl.BarsArray[i].Instrument.FullName;
  							break;
  						}
                  }
                  return symbol#;
              }
              set { symbol# = value.ToUpper(); }

Please let me know if you have any questions.

[symbol]

Thanks Patrick. That has corrected the issue.
Nick