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DXRelativeStrengthIndexIndicator Class

The Relative Strength Index oscillator indicator.

Namespace: DevExpress.Xamarin.iOS.Charts

Assembly: DevExpress.Xamarin.iOS.Charts.dll

NuGet Package: DevExpress.XamarinForms.Charts

Declaration

public class DXRelativeStrengthIndexIndicator :
    DXCalculatedSeries

Remarks

This indicator looks as follows:

Relative Strength Index Indicator Sample

How to: Specify Indicator Data

This example demonstrates how to implement the calculated series’ data source:

// In the ViewDidLoad method.
DXStockSeries stockSeries = InitStock();
this.chart.AddSeries(stockSeries);
this.indicatorChart.AddSeries(
    new DXRelativeStrengthIndexIndicator {
        Data = new CalculatedSeriesData(stockSeries),
        PointsCount = 14,
        DisplayName = "RSI",
        ValueLevel = DXValueLevel.Close,
        LegendTextPattern = "{S} (14)",
        ShowInLegend = true
    }
);
// ...

public class CalculatedSeriesData: DXCalculatedSeriesData {
    DXSeries series;    
    public CalculatedSeriesData(DXSeries series) {
        this.series = series;
    }
    public override DXSeries Source => series;
}

The code above uses the classes and members below:

Symbol

Description

DXRelativeStrengthIndexIndicator

The Relative Strength Index oscillator indicator.

DXSeries.Data

Gets or sets data the series display on the Chart.

DXRelativeStrengthIndexIndicator.PointsCount

DXRelativeStrengthIndexIndicator.ValueLevel

Note

The indicator does not require any specific type of source series’ data. The only limitation is the number of source data points should be larger than or equal to PointsCount.

How to: Configure Indicator Hint Options

The chart Hint interacts with series to request values to display, to ask series what axis lines the Crosshair should display, etc:

Hint Options Sample

The following code specifies how the hint displays the series:

series.HintOptions = new DXSeriesCrosshairOptions {
    PointTextPattern = "{S}: {V$#.#}",
    ShowInLabel = true,
    AxisLineHidden = false,
    AxisLabelHidden = false,
};

The series can utilize the classes and properties below to configure how the hint displays it:

Symbol

Description

HintOptions

DXSeriesCrosshairOptions

DXSeriesHintOptionsBase.PointTextPattern

DXSeriesCrosshairOptions.ShowInLabel

DXSeriesCrosshairOptions.AxisLineHidden

DXSeriesCrosshairOptions.AxisLabelHidden

Note

Properties the DXSeriesCrosshairOptions class introduces do not affect the hint when the hint’s Behavior is set to DXTooltipHintBehavior. At the same time, all properties the class inherits from its parent influence the hint.

How to: Manage the Indicator Appearance

The series style provides the following parameters that specify a series’ appearance:

Area Series Appearance

The code below customizes the Relative Strength Index indicator’s appearance:

indicator.Style = new DXLineIndicatorStyle {
    Stroke = UIColor.FromRGB(0.898f, 0.224f, 0.208f),
    StrokeThickness = 3,
};

This code utilizes the following classes and members:

Symbol

Description

DXRelativeStrengthIndexIndicator.Style

DXLineIndicatorStyle

DXLineIndicatorStyle.Stroke

DXLineIndicatorStyle.StrokeThickness

Implements

IEquatable<Foundation.NSObject>
Foundation.INSObjectProtocol
ObjCRuntime.INativeObject

Inheritance

Object
Foundation.NSObject
See Also