BollingerBandsIndicator Class
A Bollinger Bands indicator.
Namespace: DevExpress.XamarinForms.Charts
Assembly: DevExpress.XamarinForms.Charts.dll
NuGet Package: DevExpress.XamarinForms.Charts
Declaration
public class BollingerBandsIndicator :
CalculatedSeries
Remarks
This indicator looks as follows:
ChartView also supports the StandardDeviationIndicator and MassIndexIndicator trend indicators for financial series.
Add an Indicator to a Series
This example demonstrates how to build a Bollinger Bands indicator for Close prices of a stock series.
- Add the
BollingerBandsIndicator
object to the chart’s collection of series (ChartView.Series). - Set the indicator’s Data property to a CalculatedSeriesDataAdapter class instance. Use this object’s Series property to specify a series for which the indicator should be calculated.
- Use the ValueLevel and PointsCount properties to specify the price level of a financial series point and the number of data points used to calculate the simple moving average and standard deviation.
- Use the StandardDeviationMultiplier property to specify the number of standard deviations that define the distance between the moving average (middle band) and the upper/lower band.
<dxc:ChartView x:Name="chart">
<dxc:ChartView.Series>
<dxc:StockSeries>
<dxc:StockSeries.Data>
<dxc:SeriesDataAdapter DataSource="{Binding StockPrices}" ArgumentDataMember="Date">
<dxc:ValueDataMember Type="High" Member="High" />
<dxc:ValueDataMember Type="Low" Member="Low" />
<dxc:ValueDataMember Type="Open" Member="Open" />
<dxc:ValueDataMember Type="Close" Member="Close" />
</dxc:SeriesDataAdapter>
</dxc:StockSeries.Data>
</dxc:StockSeries>
<dxc:BollingerBandsIndicator ValueLevel="Close"
PointsCount="20"
StandardDeviationMultiplier="2"
DisplayName="Bollinger Bands 20">
<dxc:BollingerBandsIndicator.Data>
<dxc:CalculatedSeriesDataAdapter Series="{Binding Series[0], Source={x:Reference chart}}"/>
</dxc:BollingerBandsIndicator.Data>
</dxc:BollingerBandsIndicator>
</dxc:ChartView.Series>
</dxc:ChartView>
Customize Indicator Appearance
To change the line appearance of the Bollinger Bands indicator, set its Style property to the BollingerBandsIndicatorStyle object with the specified settings.
<dxc:BollingerBandsIndicator>
<dxc:BollingerBandsIndicator.Style>
<dxc:BollingerBandsIndicatorStyle Stroke="#ff1ceb" StrokeThickness="2"
UpperStroke="#ff1ceb" LowerStroke="#ff1ceb" />
</dxc:BollingerBandsIndicator.Style>
<!--Indicator Data-->
</dxc:BollingerBandsIndicator>
Implements
Inheritance
Object
ChartSeriesElement
SeriesBase
Series
CalculatedSeries
BollingerBandsIndicator
See Also