ISankeyColorizer Interface

Declares the base functionality for Sankey diagram colorizers.

Namespace: DevExpress.XtraCharts.Sankey

Assembly: DevExpress.XtraCharts.v20.2.dll

NuGet Packages: DevExpress.Charts, DevExpress.WindowsDesktop.Charts

Declaration

C#

public interface ISankeyColorizer

VB.NET

Public Interface ISankeyColorizer

Related API Members

The following members return ISankeyColorizer objects:

• SankeyDiagramControl.Colorizer

Remarks

Example

This example implements a custom algorithm that paints diagram nodes and links.

To do this, create a class that implements the ISankeyColorizer interface. Then, assign an object of this class to the Colorizer property.

The following code implements a colorizer that applies random colors to nodes and specifies colors used to apply a gradient fill to links:

C#

private void Form1_Load(object sender, EventArgs e) {
    sankeyDiagramControl1.Colorizer = new MyColorizer {
        LinkSourceColor = Color.Red,
        LinkTargetColor = Color.Yellow
    };

public class MyColorizer : ISankeyColorizer {
    public event EventHandler ColorizerChanged;
    Random rand = new Random();
    Dictionary<string, Color> KeyColorPairs = new Dictionary<string, Color>();
    public Color LinkSourceColor { get; set; }
    public Color LinkTargetColor { get; set; }
    public Color GetLinkSourceColor(SankeyLink link) {
        return LinkSourceColor;
    }
    public Color GetLinkTargetColor(SankeyLink link) {
        return LinkTargetColor;
    }
    public 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.FromArgb(rand.Next(256), rand.Next(256), rand.Next(256));
    }
}

VB.NET

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
    sankeyDiagramControl1.Colorizer = New MyColorizer With {
        .LinkSourceColor = Color.Red,
        .LinkTargetColor = Color.Yellow
    }
End Sub

Public Class MyColorizer
    Inherits ISankeyColorizer

    Public Event ColorizerChanged As EventHandler
    Private rand As Random = New Random()
    Private KeyColorPairs As Dictionary(Of String, Color) = New Dictionary(Of String, Color)()
    Public Property LinkSourceColor As Color
    Public Property LinkTargetColor As Color

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

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

    Public 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.FromArgb(rand.Next(256), rand.Next(256), rand.Next(256))
    End Function
End Class