【TeeChart Pro ActiveX教程】（十三）：圖表面板上的自定義繪圖（下）

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下載TeeChart Pro ActiveX最新版本

添加2D形狀

以與Canvas Lines類似的方式添加Canvas Shapes。以下示例在圖表區(qū)域的中心添加一個Rectangle：

2D圖表

2D圖表僅支持2D形狀。

[C＃]

private void tChart1_AfterDraw（object sender，Steema.TeeChart.Drawing.Graphics3D g）{ 
        Size s = new Size（100,100）; 
        Point l = new Point（g.ChartXCenter  - （s.Width / 2），g.ChartYCenter  - （s.Height / 2））; 
        Rectangle r = new Rectangle（l，s）; 
        g.Pen.Color = Color.Aquamarine; 
        g.Brush.Color = Color.Blue; 
        g.Rectangle（R）; 
} 

[VB.Net]

Private Sub TChart1_AfterDraw(ByVal sender As Object, ByVal g As Steema.TeeChart.Drawing.Graphics3D) Handles TChart1.AfterDraw 
        Dim S As New Size(100, 100) 
        Dim L As New Point(g.ChartXCenter - (S.Width / 2), g.ChartYCenter - (S.Height / 2)) 
        Dim R As New Rectangle(L, S) 
        g.Pen.Color = Color.Aquamarine 
        g.Brush.Color = Color.Blue 
        g.Rectangle(R) 
End Sub 

3D圖表

在3D圖表上，您也可以在Z平面中移動矩形。請參閱RectangleWithZ方法。此示例將矩形放置在左側(cè)墻壁上，但將其移向圖表后部的中間位置（朝向后墻）。

[C#]

private void Form1_Load(object sender, System.EventArgs e) { 
        point3DSeries1.LinePen.Visible = false; 
        point3DSeries1.FillSampleValues(20); 
        point3DSeries1.VertAxis = VerticalAxis.Both; 
        point3DSeries1.HorizAxis = HorizontalAxis.Both; 
        tChart1.Aspect.Chart3DPercent = 50; 
        tChart1.Axes.Depth.Visible = true; 
} 
 
private void tChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g) { 
        Size s = new Size(100,100); 
        Point l = new Point(tChart1.Axes.Left.Position, g.ChartYCenter - (s.Height / 2)); 
        Rectangle r = new Rectangle(l,s); 
        g.Pen.Color = Color.Aquamarine; 
        g.Brush.Color = Color.Blue; 
        g.Rectangle(r, tChart1.Aspect.Width3D/2); 
} 

[VB.Net]

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 
        Point3DSeries1.LinePen.Visible = False 
        Point3DSeries1.FillSampleValues(20) 
        Point3DSeries1.VertAxis = Steema.TeeChart.VerticalAxis.Both 
        Point3DSeries1.HorizAxis = Steema.TeeChart.HorizontalAxis.Both 
        TChart1.Aspect.Chart3DPercent = 50 
        TChart1.Axes.Depth.Visible = True 
End Sub 
 
Private Sub TChart1_AfterDraw(ByVal sender As Object, ByVal g As Steema.TeeChart.Drawing.Graphics3D) Handles TChart1.AfterDraw 
        Dim S As New Size(100, 100) 
        Dim L As New Point(TChart1.Axes.Left.Position, g.ChartYCenter - (S.Height / 2)) 
        Dim R As New Rectangle(L, S) 
        g.Pen.Color = Color.Aquamarine 
        g.Brush.Color = Color.Blue 
        g.Rectangle(R, TChart1.Aspect.Width3D / 2) 
End Sub 

添加3D形狀

您可以將3D形狀添加到3D圖表中。此示例在Chart矩形的中間繪制一個Cube：

[C＃]

private void Form1_Load(object sender, System.EventArgs e) { 
        point3DSeries1.LinePen.Visible = false; 
        point3DSeries1.FillSampleValues(20); 
        tChart1.Aspect.Chart3DPercent = 50; 
        tChart1.Legend.Visible = false; 
        tChart1.Axes.Depth.Visible = true; 
} 
 
private void tChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g) { 
        Size s = new Size(50,50); 
        Point p = new Point(g.ChartXCenter - (s.Width/2), g.ChartYCenter - (s.Height/2)); 
        Rectangle r = new Rectangle(p,s); 
        g.Cube(r, 0, 20, true); 
} 

[VB.Net]

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 
        Point3DSeries1.LinePen.Visible = False 
        Point3DSeries1.FillSampleValues(20) 
        TChart1.Aspect.Chart3DPercent = 50 
        TChart1.Legend.Visible = False 
        TChart1.Axes.Depth.Visible = True 
End Sub 
 
Private Sub TChart1_AfterDraw(ByVal sender As Object, ByVal g As Steema.TeeChart.Drawing.Graphics3D) Handles TChart1.AfterDraw 
        Dim S As New Size(50, 50) 
        Dim P As New Point(g.ChartXCenter - (S.Width / 2), g.ChartYCenter - (S.Height / 2)) 
        Dim R As New Rectangle(P, S) 
        g.Cube(R, 0, 20, True) 
End Sub 

添加文字

2D文本位置

將文本添加到最后一個矩形：

[C＃]

private void tChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g) { 
        string text = "My Text"; 
        Size s = new Size(150, 50); 
        Point p = new Point(g.ChartXCenter - (s.Width/2), g.ChartYCenter - (s.Height/2)); 
        Rectangle r = new Rectangle(p,s); 
        g.Pen.Color = Color.Blue; 
        g.Rectangle(r); 
 
        g.TextOut(Convert.ToInt32(g.ChartXCenter - (g.TextWidth(text)/2)), Convert.ToInt32(g.ChartYCenter - (g.TextHeight(text)/2)), text); 
} 

[VB.Net]

Private Sub TChart1_AfterDraw(ByVal sender As Object, ByVal g As Steema.TeeChart.Drawing.Graphics3D) Handles TChart1.AfterDraw 
        Dim Text As String = "My Text" 
        Dim S As New Size(50, 50) 
        Dim P As New Point(g.ChartXCenter - (S.Width / 2), g.ChartYCenter - (S.Height / 2)) 
        Dim R As New Rectangle(P, S) 
        g.Pen.Color = Color.Blue 
        g.Rectangle(R) 
 
        g.TextOut(Convert.ToInt32(g.ChartXCenter - (g.TextWidth(Text) / 2)), Convert.ToInt32(g.ChartYCenter - (g.TextHeight(Text) / 2)), Text) 
End Sub 

3D文字位置

通過使用帶有az坐標的TextOut重載，可以將文本放置在不同的3D平面中。

[c#]

private void Form1_Load(object sender, System.EventArgs e) { 
        point3DSeries1.FillSampleValues(20); 
        point3DSeries1.LinePen.Visible = false; 
        tChart1.Aspect.Chart3DPercent = 50; 
} 
 
private void tChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g) { 
        string text = "My Text"; 
        g.TextOut(g.ChartXCenter, g.ChartYCenter, tChart1.Aspect.Width3D / 2, text); 
} 

[VB.Net]

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 
        Point3DSeries1.FillSampleValues(20) 
        Point3DSeries1.LinePen.Visible = False 
        TChart1.Aspect.Chart3DPercent = 50 
End Sub 
 
Private Sub TChart1_AfterDraw(ByVal sender As Object, ByVal g As Steema.TeeChart.Drawing.Graphics3D) Handles TChart1.AfterDraw 
        Dim Text As String = "My Text" 
        g.TextOut(g.ChartXCenter, g.ChartYCenter, TChart1.Aspect.Width3D / 2, Text) 
End Sub 

應用示例

此示例獲取系列的第3和第10個值，在它們之間繪制一條直線，并告訴我們新線的第一個和最后一個點的值以及它們之間的差異：

[c#]

private void Form1_Load(object sender, System.EventArgs e) { 
        tChart1.Aspect.View3D = false; 
        line1.FillSampleValues(20); 
} 
 
private void tChart1_AfterDraw(object sender, Steema.TeeChart.Drawing.Graphics3D g) { 
        if(tChart1.Series.Count > 0){ 
            if(tChart1.Series[0].Count > 10) { 
                Series s = tChart1.Series[0]; 
                int h = Convert.ToInt32(g.TextHeight("H")); 
                Point p1 = new Point(s.CalcXPos(3), s.CalcYPos(3)); 
                Point p2 = new Point(s.CalcXPos(10), s.CalcYPos(10)); 
                g.Pen.Color = Color.Blue; 
                g.Pen.Width = 2; 
                g.Pen.Style = System.Drawing.Drawing2D.DashStyle.Dash; 
                g.MoveTo(p1); 
                g.LineTo(p2, 0); 
                g.TextOut(p1.X, p1.Y - h, "Point value: " + s.YValues[3].ToString()); 
                g.TextOut(p2.X, p2.Y, "Point value: " + s.YValues[10].ToString()); 
                g.TextOut(p2.X, p2.Y + h, "Change is: " + Convert.ToString(s.YValues[3] - s.YValues[10])); 
            } 
        } 
} 

[VB.Net]

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 
        TChart1.Aspect.View3D = False 
        Line1.FillSampleValues(20) 
End Sub 
 
Private Sub TChart1_AfterDraw(ByVal sender As Object, ByVal g As Steema.TeeChart.Drawing.Graphics3D) Handles TChart1.AfterDraw 
        If TChart1.Series.Count > 0 Then 
            If TChart1.Series(0).Count > 10 Then 
                Dim S As Steema.TeeChart.Series = TChart1.Series(0) 
                Dim H As Integer = Convert.ToInt32(g.TextHeight("H")) 
                Dim P1 As New Point(S.CalcXPos(3), S.CalcYPos(3)) 
                Dim P2 As New Point(S.CalcXPos(10), S.CalcYPos(10)) 
                g.Pen.Color = Color.Blue 
                g.Pen.Width = 2 
                g.Pen.Style = System.Drawing.Drawing2D.DashStyle.Dash 
                g.MoveTo(P1) 
                g.LineTo(P2, 0) 
                g.TextOut(P1.X, P1.Y - H, "Point value: " & S.YValues(3)) 
                g.TextOut(P2.X, P2.Y, "Point value: " & S.YValues(10)) 
                g.TextOut(P2.X, P2.Y + H, "Change is: " & (S.YValues(3) - S.YValues(10))) 
            End If 
        End If 
End Sub

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