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CustomAggregateFunction.Calculate(GroupInfo) Method

Calculates the aggregated values of the specified series point value group.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v24.2.dll

NuGet Package: DevExpress.Charts

#Declaration

public abstract double[] Calculate(
    GroupInfo groupInfo
)

#Parameters

Name Type Description
groupInfo GroupInfo

Information about values that should be aggregated.

#Returns

Type Description
Double[]

The array of data point values.

#Remarks

The group info stores the following value collections in its properties:

Property Value Levels
GroupInfo.Values1 Value (for common and the bubble series), Value_1 (for range series), High (for financial series)
GroupInfo.Values2 Weight (for the bubble series), Value_2 (for range series), Low (for financial series)
GroupInfo.Values3 Open (for financial series)
GroupInfo.Values4 Close (for financial series)

#Example

Follow the steps below to create an aggregate function.

private void Form1_Load(object sender, EventArgs e) {
    Series series = chartControl.Series["Random Data"];
    series.DataSource = GenerateData(100_000);
    series.ArgumentDataMember = "Argument";
    series.ValueDataMembers.AddRange("Value", "Value", "Value", "Value");

    XYDiagram diagram = chartControl.Diagram as XYDiagram;
    diagram.AxisX.DateTimeScaleOptions.AggregateFunction = AggregateFunction.Custom;
    diagram.AxisX.DateTimeScaleOptions.CustomAggregateFunction = new OhlcAggregateFunction();
}

class OhlcAggregateFunction : CustomAggregateFunction {
    public override double[] Calculate(GroupInfo groupInfo) {
        double open = groupInfo.Values1.First();
        double close = groupInfo.Values1.Last();
        double high = Double.MinValue;
        double low = Double.MaxValue;
        foreach (double value in groupInfo.Values1) {
            if (high < value) high = value;
            if (low > value) low = value;
        }

        return new double[] { high, low, open, close };
    }
}
See Also