A newer version of this page is available. Switch to the current version.

TreeMapItemGroupInfo.GroupIndex Property

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

Namespace: DevExpress.XtraTreeMap

Assembly: DevExpress.XtraTreeMap.v18.2.dll

Declaration

public int GroupIndex { get; }
Public ReadOnly Property GroupIndex As Integer

Property Value

Type Description
Int32

A Int32 value.

Examples

To implement a custom colorizer, design a class implementing the ITreeMapColorizer interface and implement the interface ITreeMapColorizer.GetItemColor method. After that, an instance of the class can be assigned to the TreeMapControl.Colorizer property.

using DevExpress.TreeMap;
using DevExpress.XtraTreeMap;
using System;
using System.Drawing;

namespace CustomColorizerSample {
    class CustomColorizer : ITreeMapColorizer {
        Palette palette = Palette.Office2016Palette;

        public Palette Palette {
            get { return palette; }
            set {
                if(palette.Equals(value)) return;
                palette = value;
                RaiseColorizerChanged();
            }
        }

        public event ColorizerChangedEventHandler ColorizerChanged;

        public Color GetItemColor(ITreeMapItem item, TreeMapItemGroupInfo group) {
            if(item.Children.Count == 0) {
                Color itemColor = Palette[group.ItemIndex % Palette.Count];
                double itemWeight = (item.Value - group.MinValue) / (group.MaxValue - group.MinValue);
                if(Double.IsNaN(itemWeight)) itemWeight = 1;

                return Color.FromArgb(
                    (int)(itemWeight * 255),
                    itemColor.R,
                    itemColor.G,
                    itemColor.B
                );
            }
            else
                return Palette[Palette.Count - 1 - (group.GroupIndex + group.GroupLevel + group.ItemIndex) % Palette.Count];

        }

        void RaiseColorizerChanged() {
            if(ColorizerChanged == null) return;
            ColorizerChanged.Invoke(this, new ColorizerChangedEventArgs());
        }
    }
}

Implements

DevExpress.XtraTreeMap.Native.IItemGroupInfo.GroupIndex
See Also