Autoscale question

[ETFVoyageur]

I would like autoscale to include the indicator's plots, but not its lines. How do I do that, both programmatically and as a chart user?

--EV

[NinjaTrader_Matthew]

The default behavior of IsAutoScale = true of an indicator is to include the plots, but not the lines.. Are you seeing something different?

At any rate, you can override the OnCalculateMinMax() method from an indicator

 //only called when IsAutoScale is set to true
public override void OnCalculateMinMax()
{				
	int		barsFromIndex	= ChartBars.FromIndex;
	int		barsToIndex		= ChartBars.ToIndex;
	double	tmpMin			= double.MaxValue;
	double	tmpMax			= double.MinValue;
	int		loopToIndex		= Calculate == Calculate.OnBarClose ? Math.Min(barsToIndex, ChartBars.Count - 2) : barsToIndex;
	
	// loop through visible bars on the chart (if desired)
	for (int barIndex = Math.Max(barsFromIndex, BarsRequiredToPlot + 1); barIndex <= loopToIndex; barIndex++)
	{		
		// loop through each Plot "Values"
		foreach (Series<double> valueSeries in Values)
		{
			double plotValue = valueSeries.GetValueAt(barIndex);
			
			// save a tmp min/max value for each plot
			tmpMin = Math.Min(tmpMin, plotValue);
			tmpMax = Math.Max(tmpMax, plotValue);
		}
	}
	// set final max/minvalue
	MaxValue = tmpMax;
	MinValue = tmpMin;
}

[ETFVoyageur]

The default behavior of IsAutoScale = true of an indicator is to include the plots, but not the lines.. Are you seeing something different?

At any rate, you can override the OnCalculateMinMax() method from an indicator

 //only called when IsAutoScale is set to true
public override void OnCalculateMinMax()
{                
    int        barsFromIndex    = ChartBars.FromIndex;
    int        barsToIndex        = ChartBars.ToIndex;
    double    tmpMin            = double.MaxValue;
    double    tmpMax            = double.MinValue;
    int        loopToIndex        = Calculate == Calculate.OnBarClose ? Math.Min(barsToIndex, ChartBars.Count - 2) : barsToIndex;
    
    // loop through visible bars on the chart (if desired)
    for (int barIndex = Math.Max(barsFromIndex, BarsRequiredToPlot + 1); barIndex <= loopToIndex; barIndex++)
    {        
        // loop through each Plot "Values"
        foreach (Series<double> valueSeries in Values)
        {
            double plotValue = valueSeries.GetValueAt(barIndex);
            
            // save a tmp min/max value for each plot
            tmpMin = Math.Min(tmpMin, plotValue);
            tmpMax = Math.Max(tmpMax, plotValue);
        }
    }
    // set final max/minvalue
    MaxValue = tmpMax;
    MinValue = tmpMin;
}

Yes, I am seeing something different, bu I do not understand it well enough to discuss. For example, it was showing the issue on my chart. I turned away and did some Internet reading. When I looked back the lines were no longer visible (values below the panel bottom). I have no idea what changed.

This sort of thing is not really new. It happens from time to time, but not usually. I do not know how to characterize when it happens. If I get something substantial I'll update this. For now, what you said is fine and I'll just keep an eye on it.

--EV

[ETFVoyageur]

Just happened again, but still not enough info to be helpful to you. I brought up a chart and the lines were included in the autoscale. I double clicked the indicator to bring up the Indicators dialog and now the chart is autoscaling the indicator on just the plots, as it should.

I do not know whether my clicks fixed it, or whether they were coincidence and it is just time-based as has sometimes seemed the case in the past.

I do not know enough to reproduce it, but I doubt it is random. Probably something more like an initial state issue, or perhaps an uninitialized variable. I'm assuming this is another NT bug, because I have no idea what the indicator itself could be doing to cause that behavior.

--EV