【TeeChart Pro ActiveX教程】（十三）：图表面板上的自定义绘图（下）

以与Canvas Lines类似的方式添加Canvas Shapes。以下示例在图表区域的中心添加一个Rectangle。

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添加2D形状

以与Canvas Lines类似的方式添加Canvas Shapes。以下示例在图表区域的中心添加一个Rectangle：

2D图表

2D图表仅支持2D形状。

[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图表

在3D图表上，您也可以在Z平面中移动矩形。请参阅RectangleWithZ方法。此示例将矩形放置在左侧墙壁上，但将其移向图表后部的中间位置（朝向后墙）。

[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 = TrueEnd SubPrivate 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形状

您可以将3D形状添加到3D图表中。此示例在Chart矩形的中间绘制一个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 = TrueEnd SubPrivate 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

将文本添加到最后一个矩形：

[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

通过使用带有az坐标的TextOut重载，可以将文本放置在不同的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 = 50End SubPrivate 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 

应用示例

此示例获取系列的第3和第10个值，在它们之间绘制一条直线，并告诉我们新线的第一个和最后一个点的值以及它们之间的差异：

[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 SubPrivate 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 IfEnd Sub

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