ScaleGridOptionsBase.CustomAggregateFunction Property
Gets or sets the custom aggregate function callback that calculates the aggregated values.
Namespace: DevExpress.XtraCharts
Assembly: DevExpress.XtraCharts.v19.1.dll
Declaration
[NonTestableProperty]
[Browsable(false)]
[XtraSerializableProperty(XtraSerializationVisibility.Hidden)]
public CustomAggregateFunction CustomAggregateFunction { get; set; }
Property Value
Type | Description |
---|---|
CustomAggregateFunction | The custom aggregate function callback. |
Property Paths
You can access this nested property as listed below:
Example
Set the CustomAggregateFunction class descendant object to the ScaleGridOptionsBase.CustomAggregateFunction
property to use the custom aggregate function. Note that the ScaleGridOptionsBase.AggregateFunction property should be set to Custom.
Note
A complete sample project is available at https://github.com/DevExpress-Examples/how-to-implement-a-custom-aggregate-function-t625114
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 };
}
}
Related GitHub Examples
The following code snippet (auto-collected from DevExpress Examples) contains a reference to the CustomAggregateFunction property.
Note
The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.