Delta change in script

[f.saeidi]

hi
i want to see delta change amount in candle 0 and candle 1 as below script:

double deltachange0=(barsType.Volumes[CurrentBar].BarDelta) - (barsType.Volumes[CurrentBar-1].BarDelta); //for candle 0 close
double deltachange1=(barsType.Volumes[CurrentBar].BarDelta) - (barsType.Volumes[CurrentBar-2].BarDelta); // for candle 1 close

Draw.TextFixed(this, "", "deltachange0: "+ deltachange0 + "\ndeltachange1: " + deltachange1, TextPosition.TopLeft);


problem is delta change 1 amount is not displayed and script dont know CurrentBar-2

how can i solve it?

Best regard.

[NinjaTrader_ChelseaB]

Hello f.saeidi,

Ensure CurrentBar is greater than 2. Use an index of CurrentBar-1 for the previous bar with assigning deltachange1.

In the scope of the class:

private double deltachange0, deltachange1;
private NinjaTrader.NinjaScript.BarsTypes.VolumetricBarsType barsType;​

In OnStateChange():

barsType = Bars.BarsSeries.BarsType as NinjaTrader.NinjaScript.BarsTypes.VolumetricBarsType;
if (barsType == null)
    Draw.TextFixed(this, "myTextFixed", "barsType is null", TextPosition.TopLeft);​

In OnBarUpdate():

if (barsType == null || CurrentBar < 3)
    return;

try
{
    deltachange0 = barsType.Volumes[CurrentBar].BarDelta - barsType.Volumes[CurrentBar - 1].BarDelta;
    deltachange1 = barsType.Volumes[CurrentBar - 1].BarDelta - barsType.Volumes[CurrentBar - 2].BarDelta;
    
    Print(string.Format("{0} | barsType.Volumes[CurrentBar].BarDelta: {1} - barsType.Volumes[CurrentBar-1].BarDelta: {2} = {3}\r\nbarsType.Volumes[CurrentBar-1].BarDelta: {3} - barsType.Volumes[CurrentBar-2].BarDelta: {4} = {5}",
        Time[0], barsType.Volumes[CurrentBar].BarDelta, barsType.Volumes[CurrentBar - 1].BarDelta, barsType.Volumes[CurrentBar].BarDelta - barsType.Volumes[CurrentBar - 1].BarDelta, barsType.Volumes[CurrentBar - 2].BarDelta, barsType.Volumes[CurrentBar - 1].BarDelta - barsType.Volumes[CurrentBar - 2].BarDelta));
    
    Draw.TextFixed(this, "myTextFixed", "deltachange0: " + deltachange0 + "\ndeltachange1: " + deltachange1, TextPosition.TopLeft);
}
catch (Exception exception)
{
    Print(exception.ToString());
}​