MassIndexIndicator.SumPointsCount Property

Gets or sets the number of summable values.

Namespace: DevExpress.XamarinForms.Charts

Assembly: DevExpress.XamarinForms.Charts.dll

NuGet Package: DevExpress.XamarinForms.Charts

Declaration

public int SumPointsCount { get; set; }

Property Value

Type	Description
Int32	The number of summable ratios.

Remarks

The summable values are calculated as the ratio of EMA(i) (exponential moving average in the i-th point) to EMA(EMA(i)).

For more information about the mass index indicator parameters, refer to the Mass Index Wikipedia page.

Example

This example demonstrates how to build a mass index indicator for a stock series. Associate this indicator with a separate Y axis and place it below the stock series.

1. Add the MassIndexIndicator 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 indicator should be calculated.
3. Use the MovingAveragePointsCount and SumPointsCount properties to specify the number of points used to calculate the exponential moving average (EMA) and the number of summable values.

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:MassIndexIndicator DisplayName="Mass Index"
                                MovingAveragePointsCount="9"
                                SumPointsCount="25">
            <dxc:MassIndexIndicator.Data>
                <dxc:CalculatedSeriesDataAdapter Series="{Binding Series[0], Source={x:Reference chart}}"/>
            </dxc:MassIndexIndicator.Data>
            <dxc:MassIndexIndicator.AxisY>
                <dxc:NumericAxisY Position="Far" AlwaysShowZeroLevel="False" GridAlignment="1">
                    <dxc:NumericAxisY.Range>
                        <dxc:NumericRange Min="23" Max="26"/>
                    </dxc:NumericAxisY.Range>
                    <dxc:NumericAxisY.Layout>
                        <dxc:AxisLayout Anchor1="0" Anchor2="0.3"/>
                    </dxc:NumericAxisY.Layout>
                </dxc:NumericAxisY>
            </dxc:MassIndexIndicator.AxisY>
        </dxc:MassIndexIndicator>
    </dxc:ChartView.Series>

    <dxc:ChartView.AxisY>
        <dxc:NumericAxisY Position="Far" AlwaysShowZeroLevel="false" AutoRangeMode="VisibleValues">
            <dxc:NumericAxisY.Layout>
                <dxc:AxisLayout Anchor1="0.4" Anchor2="1"/>
            </dxc:NumericAxisY.Layout>
            <dxc:NumericAxisY.Label>
                <dxc:AxisLabel Position="Outside" TextFormat="$#"/>
            </dxc:NumericAxisY.Label>
        </dxc:NumericAxisY>
    </dxc:ChartView.AxisY>
</dxc:ChartView>