IColorizerValueProvider.GetValue(IHierarchicalItem, Int32) Method

Returns a value based on an item and its index.

Namespace: DevExpress.XtraTreeMap

Assembly: DevExpress.XtraTreeMap.v23.2.dll

NuGet Package: DevExpress.TreeMap

Declaration

C#

double GetValue(
    IHierarchicalItem item,
    int itemIndex
)

VB.NET

Function GetValue(
    item As IHierarchicalItem,
    itemIndex As Integer
) As Double

Parameters

Name	Type	Description
item	IHierarchicalItem	A treemap/sunburst item.
itemIndex	Int32	An item index.

Returns

Type	Description
Double	A value that the colorizer uses to determine an item color.

Example

The following example shows how to make a treemap colorizer determine item colors based on the bound data source’s “HPI” row values:

C#

((TreeMapColorizerBase)treeMapControl1.Colorizer).ValueProvider = new ColorizerValueProvider();
//...
public class ColorizerValueProvider : IColorizerValueProvider {
    double IColorizerValueProvider.GetValue(IHierarchicalItem item, int itemIndex) {
        DataRowView row = item.Tag as DataRowView;
        if (row != null)
            return (double)row["HPI"];
        return 0;
    }
}

VB.NET

CType(treeMapControl1.Colorizer, TreeMapColorizerBase).ValueProvider = New ColorizerValueProvider()
'...
Public Class ColorizerValueProvider
    Inherits IColorizerValueProvider

    Private Function GetValue(ByVal item As IHierarchicalItem, ByVal itemIndex As Integer) As Double
        Dim row As DataRowView = TryCast(item.Tag, DataRowView)
        If row IsNot Nothing Then Return CDbl(row("HPI"))
        Return 0
    End Function
End Class