TreeMapItemGroupInfo.GroupIndex Property

Returns the index of the group in the descending sorted item collection of the group’s parent.

Namespace: DevExpress.Xpf.TreeMap

Assembly: DevExpress.Xpf.TreeMap.v18.2.dll

Declaration

C#

public int GroupIndex { get; }

VB.NET

Public ReadOnly Property GroupIndex As Integer

Property Value

Type	Description
Int32	A Int32 value.

Example

To customize the layout algorithm, do the following.

• Assign a newly created TreeMapLayoutAlgorithmBase class descendant object to the TreeMapControl.LayoutAlgorithm property.
• Optionally, for all predefined layout algorithms, it is possible to specify a layout’s fill direction using the TreeMapLayoutAlgorithm.Direction property.
• In addition to the layout direction, for the SliceAndDiceLayoutAlgorithm you can change its mode using the SliceAndDiceLayoutAlgorithm.LayoutMode property.

Note

A complete sample project is available at https://github.com/DevExpress-Examples/how-to-change-the-layout-algorithm-used-by-treemap-t308988.

MainWindow.xaml

<dxtm:TreeMapControl x:Name="treeMap"
                     LayoutAlgorithm="{Binding ElementName=lbLayoutAlgorithm, Path=SelectedValue}">
    <!-- endregion #LayoutAlgorithm-->
    <dxtm:TreeMapControl.Colorizer>
        <dxtm:TreeMapPaletteColorizer/>
    </dxtm:TreeMapControl.Colorizer>
    <dxtm:TreeMapItemStorage>
        <dxtm:TreeMapItem Label="Americas">
            <dxtm:TreeMapItem Label="United States" Value="17.418"/>
            <dxtm:TreeMapItem Label="Brazil" Value="2.353"/>
        </dxtm:TreeMapItem>
        <dxtm:TreeMapItem Label="Europe">
            <dxtm:TreeMapItem Label="Germany" Value="3.859"/>
            <dxtm:TreeMapItem Label="United Kingdom" Value="2.945"/>
            <dxtm:TreeMapItem Label="France" Value="2.846"/>
            <dxtm:TreeMapItem Label="Italy" Value="2.147"/>
            <dxtm:TreeMapItem Label="Russia" Value="1.857"/>
        </dxtm:TreeMapItem>
        <dxtm:TreeMapItem Label="Asia">
            <dxtm:TreeMapItem Label="China" Value="10.380"/>
            <dxtm:TreeMapItem Label="Japan" Value="4.616"/>
            <dxtm:TreeMapItem Label="India" Value="2.049"/>
        </dxtm:TreeMapItem>
    </dxtm:TreeMapItemStorage>
    <!--region #CloseTag-->
</dxtm:TreeMapControl>
<!--endregion #CloseTag-->
<Grid Grid.Column="1" Margin="4">
    <Grid.RowDefinitions>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="Auto"/>
        <RowDefinition Height="Auto"/>
    </Grid.RowDefinitions>
    <TextBlock Grid.Row="0" 
               Margin="0,0,0,4"
               Text="Layout Algorithm:"/>
    <!--region #LayoutAlgorithmList-->
    <ListBox x:Name="lbLayoutAlgorithm"
             Grid.Row="1"
             DisplayMemberPath="LayoutAlgorithmName"
             SelectedValuePath="LayoutAlgorithm"
             SelectedIndex="0">
        <local:LayoutAlgorithmWarapper LayoutAlgorithmName="Slice and Dice">
            <dxtm:SliceAndDiceLayoutAlgorithm/>
        </local:LayoutAlgorithmWarapper>
        <local:LayoutAlgorithmWarapper LayoutAlgorithmName="Squarified">
            <dxtm:SquarifiedLayoutAlgorithm/>
        </local:LayoutAlgorithmWarapper>
        <local:LayoutAlgorithmWarapper LayoutAlgorithmName="Striped">
            <dxtm:StripedLayoutAlgorithm/>
        </local:LayoutAlgorithmWarapper>
    </ListBox>

Related GitHub Examples

The following code snippet (auto-collected from DevExpress Examples) contains a reference to the GroupIndex 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.

C#

how-to-implement-the-custom-tree-map-colorizer-t309141/CS/CustomColorizerSample/CustomColorizer.cs#L10

Color itemColor = Palette[group.ItemIndex % Palette.Count];
Color groupColor = Palette[group.GroupIndex % Palette.Count];
double proportion = (item.Value - group.MinValue) /

VB.NET

how-to-implement-the-custom-tree-map-colorizer-t309141/VB/CustomColorizerSample/CustomColorizer.vb#L12

Dim itemColor As Color = Palette(group.ItemIndex Mod Palette.Count)
Dim groupColor As Color = Palette(group.GroupIndex Mod Palette.Count)
Dim proportion As Double = (item.Value - group.MinValue) / (group.MaxValue - group.MinValue)