本文主要介紹TeeChart for .NET使用教程中關(guān)于附加軸的相關(guān)介紹。

復(fù)制軸

TeeChart for .NET提供 5 個(gè)與數(shù)據(jù)系列相關(guān)聯(lián)的軸：左、上、下、右和深度。當(dāng)您將新系列添加到圖表時(shí)，您可以定義系列應(yīng)該與哪個(gè)軸相關(guān)（轉(zhuǎn)到系列選項(xiàng)卡，常規(guī)頁面）。您可以使用 Axis Customdraw 方法在圖表上的任何位置重復(fù)前面 4 個(gè)軸中的任何一個(gè)（或全部）。請(qǐng)注意，此方法會(huì)復(fù)制您的軸，它不會(huì)添加新的自定義軸。有關(guān)詳細(xì)信息，請(qǐng)參閱下一部分“多個(gè)自定義軸”。 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 Sub 
 
Private 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 If 
End Sub 

上面的示例代碼將生成下圖：

自定義軸：在此示例中，TeeChart 將在圖表中心繪制新軸，一個(gè)水平軸和一個(gè)垂直軸。當(dāng)您滾動(dòng)圖表（用鼠標(biāo)右鍵拖動(dòng)）時(shí)，新的垂直軸將始終保持在圖表的中心，新的水平軸將隨著垂直滾動(dòng)上下移動(dòng)。新軸是默認(rèn)軸的精確副本。

多個(gè)自定義軸

與 PositionPercent 和拉伸屬性一起，可以在圖表上的任何位置浮動(dòng)無限的軸。滾動(dòng)、縮放和軸命中檢測也適用于自定義創(chuàng)建的軸。現(xiàn)在可以在設(shè)計(jì)時(shí)通過 TeeChart 編輯器和在運(yùn)行時(shí)通過幾行代碼創(chuàng)建額外的軸：

通過圖表編輯器

TeeChart 使您能夠在設(shè)計(jì)時(shí)創(chuàng)建自定義軸，從而使它們能夠以 TeeChart 的 tee 文件格式保存。為此，打開圖表編輯器并單擊軸選項(xiàng)卡，然后選擇“+”按鈕添加自定義軸。然后選擇位置選項(xiàng)卡，確保突出顯示新的自定義軸。此頁面上的水平復(fù)選框允許您將新的自定義軸定義為水平軸或?qū)⑵浔Ａ魹槟J(rèn)垂直軸。此頁面的其余部分和軸頁面中的其他選項(xiàng)卡可用于更改自定義軸的比例、增量、標(biāo)題、標(biāo)簽、刻度、次刻度和位置，如上所述。要將這個(gè)新的自定義軸與您想要的數(shù)據(jù)系列相關(guān)聯(lián)，請(qǐng)選擇“系列”選項(xiàng)卡并轉(zhuǎn)到“常規(guī)”頁面，其中下拉組合框“水平軸”和“垂直軸”將使您能夠根據(jù)您之前是否定義選擇新的自定義軸它是垂直的或水平的。

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 = 20 
End Sub 

上面的編碼示例將顯示以下圖表：

多軸：選擇是無限的！我們建議在使用自定義軸時(shí)要小心，因?yàn)楹苋菀组_始用新軸填充屏幕并忘記要管理哪個(gè)軸！

本次關(guān)于.NET圖表控件TeeChart for .NET的教程就介紹到這里了，下一篇將介紹圖例設(shè)計(jì)的相關(guān)內(nèi)容。

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TeeChart for .NET 是優(yōu)秀的工業(yè)4.0 WinForm圖表控件，官方獨(dú)家授權(quán)漢化，集功能全面、性能穩(wěn)定、價(jià)格實(shí)惠等優(yōu)勢(shì)于一體。