EnvelopeIndicator.PointsCount Property

Gets or sets the number of data points used to calculate the simple moving average.

Namespace: DevExpress.XamarinForms.Charts

Assembly: DevExpress.XamarinForms.Charts.dll

NuGet Package: DevExpress.XamarinForms.Charts

Declaration

public int PointsCount { get; set; }

Property Value

Type	Description
Int32	The number of points.

Example

This example demonstrates how to build a simple moving average envelope for Close values of a stock series.

1. Add the EnvelopeIndicator object to the chart’s collection of series (ChartView.Series).
2. Set the indicator’s Data property to a CalculatedSeriesDataAdapter class instance. Use this object’s Series property to specify a series for which the moving average envelope should be built.
3. 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 moving average.
4. Set the Factor property to a double value from 0 to 1 to specify the distance (as a percentage) between the moving average and an envelope line.

Note

When you specify the envelope indicator, the moving average line is not visible. To build and show it on the chart, add the MovingAverageIndicator object to the chart’s collection of series.

Xaml

<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:EnvelopeIndicator ValueLevel="Close"
                               PointsCount="20"
                               Factor="0.04"
                               DisplayName="Moving Average Envelope">
            <dxc:EnvelopeIndicator.Data>
                <dxc:CalculatedSeriesDataAdapter Series="{Binding Series[0], Source={x:Reference chart}}"/>
            </dxc:EnvelopeIndicator.Data>
        </dxc:EnvelopeIndicator>
    </dxc:ChartView.Series>
</dxc:ChartView>