SankeyDiagramControl.Colorizer Property

Gets or sets the colorizer used to colorize Sankey items.

Namespace: DevExpress.Xpf.Charts.Sankey

Assembly: DevExpress.Xpf.Charts.v23.2.dll

NuGet Package: DevExpress.Wpf.Charts

Declaration

C#

public SankeyColorizerBase Colorizer { get; set; }

VB.NET

Public Property Colorizer As SankeyColorizerBase

Property Value

Type	Description
SankeyColorizerBase	The colorizer object.

Remarks

The Sankey diagram control uses the SankeyPaletteColorizer to color nodes. A new color from the palette is applied to each node with a unique label. Specify the SankeyPaletteColorizer.Palette property to change colors that are used to paint nodes. You can select one of predefined palettes.

XAML

xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/charts"
<!--...-->
<dxsa:SankeyDiagramControl.Colorizer>
    <dxsa:SankeyPaletteColorizer LinkBrush="Gray">
        <dxsa:SankeyPaletteColorizer.Palette>
            <dxc:NorthernLightsPalette/>
        </dxsa:SankeyPaletteColorizer.Palette>
    </dxsa:SankeyPaletteColorizer>
</dxsa:SankeyDiagramControl.Colorizer>

You can also create a new palette as follows:

XAML

xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/charts"
<!--...-->
<dxsa:SankeyDiagramControl.Colorizer>
    <dxsa:SankeyPaletteColorizer LinkBrush="Gray">
        <dxsa:SankeyPaletteColorizer.Palette>
            <dxc:CustomPalette>
                <dxc:CustomPalette.Colors>
                    <Color>Red</Color>
                    <Color>Green</Color>
                    <Color>Magenta</Color>
                </dxc:CustomPalette.Colors>
            </dxc:CustomPalette>
        </dxsa:SankeyPaletteColorizer.Palette>
    </dxsa:SankeyPaletteColorizer>
</dxsa:SankeyDiagramControl.Colorizer>

To paint links and nodes based on a custom algorithm, create a class derived from the SankeyColorizerBase class. Then, assign an object of this class to the SankeyDiagramControl.Colorizer property.

The following example implements a colorizer that applies random colors to nodes and applies a gradient fill to links.

XAML

<dxsa:SankeyDiagramControl.Colorizer>
    <local:MyColorizer LinkSourceColor="Yellow" LinkTargetColor="Red" />
</dxsa:SankeyDiagramControl.Colorizer>

C#

public class MyColorizer : SankeyColorizerBase {
    readonly Random rand = new Random();
    readonly Dictionary<string, Color> KeyColorPairs = new Dictionary<string, Color>();
    public Color LinkSourceColor { get; set; }
    public Color LinkTargetColor { get; set; }
    public override Color GetLinkSourceColor(SankeyLink link) {
        return LinkSourceColor;
    }
    public override Color GetLinkTargetColor(SankeyLink link) {
        return LinkTargetColor;
    }
    public override Color GetNodeColor(SankeyNode info) {
        if (!KeyColorPairs.TryGetValue((string)info.Tag, out Color nodeColor)) {
            nodeColor = GenerateColor();
            KeyColorPairs.Add((string)info.Tag, nodeColor);
        }
        return nodeColor;
    }
    private Color GenerateColor() {
        return Color.FromRgb((byte)rand.Next(256), (byte)rand.Next(256), (byte)rand.Next(256));
    }
}

VB.NET

Public Class MyColorizer
    Inherits SankeyColorizerBase
    Private ReadOnly rand As Random = New Random()
    Private ReadOnly KeyColorPairs As Dictionary(Of String, Color) = New Dictionary(Of String, Color)()
    Public Property LinkSourceColor As Color
    Public Property LinkTargetColor As Color

    Public Overrides Function GetLinkSourceColor(ByVal link As SankeyLink) As Color
        Return LinkSourceColor
    End Function

    Public Overrides Function GetLinkTargetColor(ByVal link As SankeyLink) As Color
        Return LinkTargetColor
    End Function

    Public Overrides Function GetNodeColor(ByVal info As SankeyNode) As Color
        Dim nodeColor As Color = Nothing

        If Not KeyColorPairs.TryGetValue(CStr(info.Tag), nodeColor) Then
            nodeColor = GenerateColor()
            KeyColorPairs.Add(CStr(info.Tag), nodeColor)
        End If

        Return nodeColor
    End Function

    Private Function GenerateColor() As Color
        Return Color.FromRgb(rand.Next(256), rand.Next(256), rand.Next(256))
    End Function
End Class