.NET图表控件TeeChart for .NET使用教程：附加轴

复制轴

TeeChart for .NET提供 5 个与数据系列相关联的轴：左、上、下、右和深度。当您将新系列添加到图表时，您可以定义系列应该与哪个轴相关（转到系列选项卡，常规页面）。您可以使用 Axis Customdraw 方法在图表上的任何位置重复前面 4 个轴中的任何一个（或全部）。请注意，此方法会复制您的轴，它不会添加新的自定义轴。有关详细信息，请参阅下一部分“多个自定义轴”。例子：

[C#.Net]private void Form1_Load(object sender, System.EventArgs e)             Random Rnd = new Random();            tChart1.Aspect.View3D = false;            tChart1.Panel.Gradient.Visible = true;            for(int t = 0; t <= 20; ++t) line1.Add(t, ((Rnd.Next(100)) + 1) - ((Rnd.Next(70)) + 1), Color.Red); private void line1_BeforeDrawValues(object sender, Steema.TeeChart.Drawing.Graphics3D g) int posAxis = 0; if(tChart1.Axes.Left.Maximum > 0)                     tChart1.Axes.Left.Draw(g.ChartXCenter - 10,g.ChartXCenter - 20,g.ChartXCenter,true);                posAxis = tChart1.Axes.Left.CalcYPosValue(10);                tChart1.Axes.Bottom.Draw(posAxis + 10, posAxis + 40, posAxis, true);  [VB.Net]Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load        Dim t As Integer        TChart1.Aspect.View3D = False        TChart1.Panel.Gradient.Visible = True        For t = 0 To 20            Line1.Add(t, ((Rnd() * 100) + 1) - ((Rnd() * 70) + 1), Color.Red)        Next    End SubPrivate Sub Line1_BeforeDrawValues(ByVal sender As Object, ByVal g As Steema.TeeChart.Drawing.Graphics3D) Handles Line1.BeforeDrawValues        Dim posAxis As Integer        If TChart1.Axes.Left.Maximum > 0 Then            TChart1.Axes.Left.Draw(g.ChartXCenter - 10, g.ChartXCenter - 20, g.ChartXCenter, True)            posAxis = TChart1.Axes.Left.CalcYPosValue(10)            TChart1.Axes.Bottom.Draw(posAxis + 10, posAxis + 40, posAxis, True)        End IfEnd Sub 

上面的示例代码将生成下图：

自定义轴：在此示例中，TeeChart 将在图表中心绘制新轴，一个水平轴和一个垂直轴。当您滚动图表（用鼠标右键拖动）时，新的垂直轴将始终保持在图表的中心，新的水平轴将随着垂直滚动上下移动。新轴是默认轴的精确副本。

多个自定义轴

Via Code[C#.Net]private void Form1_Load(object sender, System.EventArgs e)             Line line1 = new Line();            Line line2 = new Line();             tChart1.Aspect.View3D = false;            tChart1.Panel.Gradient.Visible = true;            tChart1.Header.Text = "TeeChart Multiple Axes";            tChart1.Series.Add(line1);            tChart1.Series.Add(line2);            for(int t = 0; t <= 10; ++t) line1.Add(Convert.ToDouble(t), Convert.ToDouble(10 + t), Color.Red); if(t > 1)                line2.Add(Convert.ToDouble(t), Convert.ToDouble(t), Color.Green);             Axis leftAxis = tChart1.Axes.Left;            leftAxis.StartPosition = 0;            leftAxis.EndPosition = 50;            leftAxis.AxisPen.Color = Color.Red;            leftAxis.Title.Font.Color = Color.Red;            leftAxis.Title.Font.Bold = true;            leftAxis.Title.Text = "1st Left Axis";//            You are able to then position the new Axis in overall relation to the Chart //            by using the StartPosition and EndPosition  properties.////            StartPosition=50//            EndPosition=100////            These figures are expressed as percentages of the Chart Rectangle with 0 (zero)//            (in the case of a vertical Axis) being Top. These properties can be applied to //            the Standard Axes to create completely partitioned 'SubCharts' within the Chart.            Axis axis1 = new Axis(false, false, tChart1.Chart);            tChart1.Axes.Custom.Add(axis1);            line2.CustomVertAxis = axis1;            axis1.StartPosition = 50;            axis1.EndPosition = 100;            axis1.AxisPen.Color = Color.Green;            axis1.Title.Font.Color = Color.Green;            axis1.Title.Font.Bold = true;            axis1.Title.Text = "Extra Axis";            axis1.PositionUnits= PositionUnits.Percent;                                                axis1.RelativePosition = 20; [VB.Net]Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load        Dim Line1 As New Steema.TeeChart.Styles.Line()        Dim Line2 As New Steema.TeeChart.Styles.Line()        Dim t As Integer        TChart1.Aspect.View3D = False        TChart1.Panel.Gradient.Visible = True        TChart1.Header.Text = "TeeChart Multiple Axes"        TChart1.Series.Add(Line1)        TChart1.Series.Add(Line2)        For t = 0 To 10            Line1.Add(t, 10 + t, Color.Red)            If (t > 1) Then                Line2.Add(t, t, Color.Green)            End If        Next        With TChart1.Axes.Left            .StartPosition = 0            .EndPosition = 50            .AxisPen.Color = Color.Red            .Title.Font.Color = Color.Red            .Title.Font.Bold = True            .Title.Text = "1st Left Axis"        End With        'You are able to then position the new Axis in overall relation to the Chart         'by using the StartPosition and EndPosition  properties.        '      StartPosition = 50        '      EndPosition = 100        'These figures are expressed as percentages of the Chart Rectangle with 0 (zero)        '(in the case of a vertical Axis) being Top. These properties can be applied to         'the Standard Axes to create completely partitioned 'SubCharts' within the Chart.        Dim Axis1 As New Steema.TeeChart.Axis(False, False, TChart1.Chart)        TChart1.Axes.Custom.Add(Axis1)        Line2.CustomVertAxis = Axis1        Axis1.StartPosition = 50        Axis1.EndPosition = 100        Axis1.AxisPen.Color = Color.Green        Axis1.Title.Font.Color = Color.Green        Axis1.Title.Font.Bold = True        Axis1.Title.Text = "Extra Axis"        Axis1.PositionUnits.=  PositionUnits.Percent;        Axis1.RelativePosition = 20End Sub 

上面的编码示例将显示以下图表：

多轴：选择是无限的！我们建议在使用自定义轴时要小心，因为很容易开始用新轴填充屏幕并忘记要管理哪个轴！

本次关于.NET图表控件TeeChart for .NET的教程就介绍到这里了，下一篇将介绍图例设计的相关内容。

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TeeChart for .NET 是优秀的工业4.0 WinForm图表控件，官方独家授权汉化，集功能全面、性能稳定、价格实惠等优势于一体。

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