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自定义节点
应用 SankeyDiagramControl.NodeLabel 属性拜访节点标签设置，以下选项使您能够配置节点标签的文本：
- TextOrientation – 标签文字方向。
- MaxWidth – 标签宽度（以像素为单位）。
- MaxLineCount – 多行文字能够占用的行数。
- TextAlignment – 文字对齐。
- Font – 字体参数。
C#
`sankeyDiagramControl1.NodeLabel.TextOrientation = TextOrientation.TopToBottom;
sankeyDiagramControl1.NodeLabel.MaxWidth = 200;
sankeyDiagramControl1.NodeLabel.MaxLineCount = 1;
sankeyDiagramControl1.NodeLabel.TextAlignment = StringAlignment.Center;
sankeyDiagramControl1.NodeLabel.Font = new Font(FontFamily.GenericSerif, 10);`
VB.NET
`sankeyDiagramControl1.NodeLabel.TextOrientation = TextOrientation.TopToBottom
sankeyDiagramControl1.NodeLabel.MaxWidth = 200
sankeyDiagramControl1.NodeLabel.MaxLineCount = 1
sankeyDiagramControl1.NodeLabel.TextAlignment = StringAlignment.Center
sankeyDiagramControl1.NodeLabel.Font = New Font(FontFamily.GenericSerif, 10)`
您还能够解决 CustomizeNode 事件来拜访特定节点并依据特定条件对其进行自定义：
C#
`sankeyDiagramControl1.CustomizeNode += OnCustomizeNode;
//…
private void OnCustomizeNode(object sender, CustomizeSankeyNodeEventArgs e) {
if (e.Label.Text == “France” && e.Node.Level == 0) {
e.Label.Font = new Font(“Tahoma”, 16);
e.Label.Text = “France (Source)”;
}
}`
VB.NET
`Private Sub OnCustomizeNode(ByVal sender As Object, ByVal e As CustomizeSankeyNodeEventArgs)
If e.Label.Text Is “France” AndAlso e.Node.Level = 0 Then
e.Label.Font = New Font(“Tahoma”, 16)
e.Label.Text = “France (Source)”
End If
End Sub`
节点排序
该控件依据根底数据主动排列节点，如果心愿重新排列节点或指定自定义排序程序，请创立一个实现 IComparer <SankeyNode> 的类。而后，将此类的对象调配给 NodeComparer 属性。
以下代码按节点的 TotalWeight 值降序排列它们：
C#
`private void Form1_Load(object sender, EventArgs e) {
sankeyDiagramControl1.NodeComparer = new MyNodeComparer();
}
public class MyNodeComparer : IComparer<SankeyNode> {
public int Compare(SankeyNode x, SankeyNode y) {
return y.TotalWeight.CompareTo(x.TotalWeight);
}
}`
VB.NET
`Friend Class SurroundingClass
Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
sankeyDiagramControl1.NodeComparer = New MyNodeComparer()
End Sub
Public Class MyNodeComparer
Inherits IComparer(Of SankeyNode)
Public Function Compare(ByVal x As SankeyNode, ByVal y As SankeyNode) As Integer
Return y.TotalWeight.CompareTo(x.TotalWeight)
End Function
End Class
End Class`
指定节点和链接色彩
Sankey diagram 控件应用 SankeyPaletteColorizer 为节点着色，应用惟一标签将调色板中的新色彩利用于每个节点。如果惟一标签的数量超过调色板色彩的数量，则色彩会反复。要将突变填充利用于链接，控件将利用源和指标节点色彩。指定 SankeyPaletteColorizer.Palette 属性来更改用于绘制 Sankey diagram 的色彩，您能够抉择预约义的调色板。
C#
`sankeyDiagramControl1.Colorizer = new SankeyPaletteColorizer {Palette = Palettes.NorthernLights};
`
VB.NET
`sankeyDiagramControl1.Colorizer = New SankeyPaletteColorizer With {
.Palette = Palettes.NorthernLights
}`
您还能够如下创立新的调色板：
C#
`using System.Drawing;
//…
Palette palette = new Palette(“Custom”) {
Color.Red,
Color.Green,
Color.Blue
};
sankeyDiagramControl1.Colorizer = new SankeyPaletteColorizer {Palette = palette};
`
VB.NET
`Imports System.Drawing
‘…
Dim palette As Palette = New Palette(“Custom”) From {
Color.Red,
Color.Green,
Color.Blue
}
sankeyDiagramControl1.Colorizer = New SankeyPaletteColorizer With {
palette
}`
自定义着色器
要基于自定义算法绘制链接和节点，请创立一个实现 ISankeyColorizer 接口的类。而后，将此类的对象调配给 Colorizer 属性。
以下代码实现了一个着色器，该着色器将随机色彩利用于节点，并指定用于将突变填充利用于链接的色彩：
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`
