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系列活动

TeeChart for .NET制图控件提供了一套出色的通用组件套件，可满足无数的制图要求，也针对重要的垂直领域，例如金融，科学和统计领域。制图控件提供了一套出色的通用组件套件，可满足无数的制图要求，也针对重要的垂直领域，例如金融，科学和统计领域。

前一节介绍了系列事件的一些用法。本节将展示一些其他用途。

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OnClickSeries

你可以使用OnClickSeries事件来获取关于一个序列的几乎任何信息(参见章节，访问序列值)。

这些示例适用于具有日期时间数据的系列，例如这些测试值可用于以下事件示例:

[C#]

private void button1_Click(object sender, System.EventArgs e)
{
Random rnd = new Random();
line1.XValues.DateTime = true;
line1.Pointer.Visible = true;
line1.Add(DateTime.Parse("25/12/2002 10:30:00"),rnd.Next(100),"", Color.Red);
line1.Add(DateTime.Parse("25/12/2002 22:30:00"),rnd.Next(100),"", Color.Red);
line1.Add(DateTime.Parse("26/12/2002 09:20:00"),rnd.Next(100),"", Color.Red);
line1.Add(DateTime.Parse("26/12/2002 23:30:00"),rnd.Next(100),"", Color.Red);
line1.Add(DateTime.Parse("27/12/2002 11:10:00"),rnd.Next(100),"", Color.Red);
line1.Add(DateTime.Parse("27/12/2002 20:15:00"),rnd.Next(100),"", Color.Red);
line1.Add(DateTime.Parse("28/12/2002 08:15:00"),rnd.Next(100),"", Color.Red);
line1.Add(DateTime.Parse("28/12/2002 21:45:00"),rnd.Next(100),"", Color.Red);
line1.Add(DateTime.Parse("29/12/2002 12:45:00"),rnd.Next(100),"", Color.Red);
line1.Add(DateTime.Parse("29/12/2002 22:05:00"),rnd.Next(100),"", Color.Red);

line1.HorizAxis = Steema.TeeChart.Styles.HorizontalAxis.Top;
}

private void tChart1_ClickSeries(object sender, Steema.TeeChart.Styles.Series s, int valueIndex, System.Windows.Forms.MouseEventArgs e)
{
//The below will show the Value of the nearest Point, not the exact Axis value at the clicked X and Y.
MessageBox.Show("Date is: " + DateTime.FromOADate(line1.XValues[valueIndex])
+ " Value is: " + line1.YValues[valueIndex]);
}

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[VB.Net]

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim rnd As New Random()
Line1.XValues.DateTime = True
Line1.Pointer.Visible = True
Line1.Add(DateTime.Parse("25/12/2002 10:30:00"), rnd.Next(100), "", Color.Red)
Line1.Add(DateTime.Parse("25/12/2002 22:30:00"), rnd.Next(100), "", Color.Red)
Line1.Add(DateTime.Parse("26/12/2002 09:20:00"), rnd.Next(100), "", Color.Red)
Line1.Add(DateTime.Parse("26/12/2002 23:30:00"), rnd.Next(100), "", Color.Red)
Line1.Add(DateTime.Parse("27/12/2002 11:10:00"), rnd.Next(100), "", Color.Red)
Line1.Add(DateTime.Parse("27/12/2002 20:15:00"), rnd.Next(100), "", Color.Red)
Line1.Add(DateTime.Parse("28/12/2002 08:15:00"), rnd.Next(100), "", Color.Red)
Line1.Add(DateTime.Parse("28/12/2002 21:45:00"), rnd.Next(100), "", Color.Red)
Line1.Add(DateTime.Parse("29/12/2002 12:45:00"), rnd.Next(100), "", Color.Red)
Line1.Add(DateTime.Parse("29/12/2002 22:05:00"), rnd.Next(100), "", Color.Red)

Line1.HorizAxis = Steema.TeeChart.Styles.HorizontalAxis.Top
End Sub

Private Sub TChart1_ClickSeries(ByVal sender As Object, ByVal s As Steema.TeeChart.Styles.Series, ByVal valueIndex As Integer, ByVal e As System.Windows.Forms.MouseEventArgs) Handles TChart1.ClickSeries
'The below will show the Value of the nearest Point, not the exact Axis value at the clicked X and Y.
MsgBox("Date is: " & DateTime.FromOADate(Line1.XValues(valueIndex)) _
& " Value is: " & Line1.YValues(valueIndex))
End Sub

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OnGetSeriesPointerStyle

对于那些使用TChart指针的系列，你可以使用OnGetSeriesPointer事件访问和修改指针:

如果该点高于上一个三角形，则绘制上一个三角形;如果该点低于上一个三角形，则绘制下一个三角形，以此类推。

[C#]

private void line1_GetPointerStyle(Steema.TeeChart.Styles.CustomPoint series, Steema.TeeChart.Styles.GetPointerStyleEventArgs e)
{
if(e.ValueIndex > 0)
{
if(line1.YValues[e.ValueIndex] > line1.YValues[e.ValueIndex - 1])
{
e.Style = Steema.TeeChart.Styles.PointerStyles.Triangle;
}
else if(line1.YValues[e.ValueIndex] < line1.YValues[e.ValueIndex - 1])
{
e.Style = Steema.TeeChart.Styles.PointerStyles.DownTriangle;
}
else
{
e.Style = Steema.TeeChart.Styles.PointerStyles.Diamond;
}
}
else
{
e.Style = Steema.TeeChart.Styles.PointerStyles.Diamond;
}
}

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[VB.Net]

Private Sub Line1_GetPointerStyle(ByVal series As Steema.TeeChart.Styles.CustomPoint, ByVal e As Steema.TeeChart.Styles.GetPointerStyleEventArgs) Handles Line1.GetPointerStyle
If e.ValueIndex > 0 Then
If (Line1.YValues(e.ValueIndex) > Line1.YValues(e.ValueIndex - 1)) Then
e.Style = Steema.TeeChart.PointerStyles.Triangle
ElseIf (Line1.YValues(e.ValueIndex) < Line1.YValues(e.ValueIndex - 1)) Then
e.Style = Steema.TeeChart.Styles.PointerStyles.DownTriangle
Else
e.Style = Steema.TeeChart.Styles.PointerStyles.Diamond
End If
Else
e.Style = Steema.TeeChart.Styles.PointerStyles.Diamond
End If
End Sub

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OnGetSeriesMark

使用OnGetSeriesMark事件在运行时修改标记内容。以下代码根据相对于最后一个的值改变MarkText;
TeeChart支持通过DragMarks工具拖动重叠的标记:

[C#]

private void line1_GetSeriesMark(Steema.TeeChart.Styles.Series series, Steema.TeeChart.Styles.GetSeriesMarkEventArgs e)
{
if(e.ValueIndex > 0)
{
if(line1.YValues[e.ValueIndex] > line1.YValues[e.ValueIndex - 1])
{
e.MarkText = e.MarkText + " (Up)";
}
else if(line1.YValues[e.ValueIndex] < line1.YValues[e.ValueIndex - 1])
{
e.MarkText = e.MarkText + " (Down)";
}
else
{
e.MarkText = e.MarkText + " (No Change)";
}
}
}

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[VB.Net]

Private Sub Line1_GetSeriesMark(ByVal series As Steema.TeeChart.Styles.Series, ByVal e As Steema.TeeChart.Styles.GetSeriesMarkEventArgs) Handles Line1.GetSeriesMark
If (e.ValueIndex > 0) Then
If (Line1.YValues(e.ValueIndex) > Line1.YValues(e.ValueIndex - 1)) Then
e.MarkText = e.MarkText + " (Up)"
ElseIf (Line1.YValues(e.ValueIndex) < Line1.YValues(e.ValueIndex - 1)) Then
e.MarkText = e.MarkText + " (Down)"
End If
Else
e.MarkText = e.MarkText + " (No Change)"
End If
End Sub

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最后两个事件所产生的图表外观如下:

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系列活动

OnClickSeries

OnGetSeriesPointerStyle

OnGetSeriesMark

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