In order to add horizontal lines, it is necessary to create a LineSeries object and add LineSeries into its collection.
Example of use in the RSI indicator
public class RSI : Indicator
{
private readonly SMMA _negative;
private readonly SMMA _positive;
public int Period
{
get => _positive.Period;
set
{
if (value <= 0)
return;
_positive.Period = _negative.Period = value;
RecalculateValues();
}
}
public RSI()
{
Panel = IndicatorDataProvider.NewPanel;
LineSeries.Add(new LineSeries("Down")
{
Color = Colors.Orange,
LineDashStyle = LineDashStyle.Dash,
Value = 30,
Width = 1
});
LineSeries.Add(new LineSeries("Up")
{
Color = Colors.Orange,
LineDashStyle = LineDashStyle.Dash,
Value = 70,
Width = 1
});
_positive = new SMMA();
_negative = new SMMA();
Period = 10;
}
protected override void OnCalculate(int bar, decimal value)
{
if (bar == 0)
{
this[bar] = 0;
}
else
{
var diff = (decimal)SourceDataSeries[bar] - (decimal)SourceDataSeries[bar - 1];
var pos = _positive.Calculate(bar, diff > 0 ? diff : 0);
var neg = _negative.Calculate(bar, diff < 0 ? -diff : 0);
if (neg != 0)
{
var div = pos / neg;
this[bar] = div == 1
? 0m
: 100m - 100m / (1m + div);
}
else
{
this[bar] = 100m;
}
}
}
}
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