Multi-Instrument help

[Json]

I want to create a ratio spread chart. ie (ZN*3)-(ZB*2).

As a strategy,
I can access both instruments with Add() but can't seem to plot.

As an Indicator,
I can plot but can't access both instuments to set ratio value.

Any ideas or direction I should look?

[NinjaTrader_JoshP]

Some people have gotten around the plotting in strategies by using Draw methods. I've seen users use DrawLine() and just draw line segments for every bar. This is not the best for efficiency and is not officially supported as a workaround either, but thought I would just throw you that idea.

[ATI user]

Plotting on strategy chart

Josh

I also want to plot on a strategy chart and have used the DrawLine workaround in the past.

This time I want to calculate the difference between $UVOL and $DVOL and draw that value as a line on the $UVOL chart somehow....or...plot both and fill the region between them (which I assume is impossible in a strategy).

So far I have not been able to pick up the value of $DVOL...which I assume I will need to subtract from the $UVOL value (close I suppose) and then store the difference in an array.

Such a simple task seems impossible. I am a little frustrated with this in NT as in eSignal I could add 2 instruments to a chart, plot one on the left vertical axis and one on the right and plot the difference also....not so here.

Any direction here would be most appreciated. Thanks

[NinjaTrader_JoshP]

Add the instruments into the strategy and then use Closes to do the subtraction and then plot that difference.

Closes[0][0] - Closes[1][0]

http://www.ninjatrader-support.com/H...V6/Closes.html

I don't think you even need to create an array. Just do the calculation and draw a line on every bar. Place the strategy on the $UVOL chart and it will do the lines there.

[ATI user]

thanks Josh

that worked fine

[ATI user]

Josh

Is there a way in a Strategy to show the price of those plots?

i.e. something like PaintPriceMarkers = true;

I did use DrawTextFixed, however would prefer the price at the plot

thanks

[NinjaTrader_JoshP]

Unfortunately this is not supported since you cannot add new plots from within the scope of a NinjaScript strategy.

[zoltran]

ATI user,
would you mind posting your uvol/dvol strategy for others to use as an example?

[ATI user]

no worries...here it is...

protected override void Initialize()
{
// Add 1 minute Bars object to the strategy
Add("^DVOL", PeriodType.Minute, 1);

}

protected override void OnBarUpdate()
{
if ( Bars.FirstBarOfSession )
DrawHorizontalLine("center", true, 0, Color.Yellow, DashStyle.Solid, 1) ;

if ( FirstTickOfBar ) {
LastUpDnVolDiff = UpDnVolDiff;
UpDnVolDiff = Closes[0][0] - Closes[1][0];
DrawLine("diff"+CurrentBar,1,LastUpDnVolDiff,0,UpD nVolDiff,Color.Blue,DashStyle.Solid,3);
DrawLine("dvol"+CurrentBar,1,-Closes[1][1],0,-Closes[1][0],Color.Red,DashStyle.Solid,1);
}
// if ( PlotVolValues == "yes" )
DrawTextFixed("volvalues", "UVOL: " + Closes[0][0] + "\nDVOL1: " + Closes[1][0] + "\nSPRD: " + UpDnVolDiff ,
TextPosition.BottomRight, Color.DimGray, new Font("Arial",8), Color.Transparent, Color.Black, 1);

}

[timmyb]

In looking at the code for the "strategyplot" sample provided i am not seeing the difference between it being an indicator or a strategy. i understand it is a indicator from a strategy, but is the only thing that accesses the strategy be the
privateint id = 1


I am still looking at it, so maybe it will dawn on me.

[NinjaTrader_JoshP]

Hi timmyb,

The StrategyPlot is an indicator. The strategy accesses the indicator and sets values to the indicator. The indicator takes those values and plots them. The ID is just to differentiate the indicator from its own instances. This allows you to use multiple plots as opposed to only one.

[timmyb]

Got ya thanks again Josh, i am sure i have been a pain to most here with my constant questions, but i have come a long way