使用第三方Steema的TeeChart控件，设置鼠标放在某一线条点上，显示某一点的数据标签问题（虚线型十字光标基准线，放在线上显示对应点的二维坐标轴数据数据），调用InitTeeChartTipTools方法即可：

/// <summary>/// TeeChart线条的指示工具/// </summary>Steema.TeeChart.Tools.CursorTool cursorTool;/// <summary>/// 鼠标指示显示的文本/// </summary>private Steema.TeeChart.Tools.Annotation annotation;/// <summary>/// 初始化线条的提示工具信息/// </summary>private void InitTeeChartTipTools(Steema.TeeChart.TChart tChart){ //以线形式对标坐标轴 cursorTool = new Steema.TeeChart.Tools.CursorTool(tChart.Chart); cursorTool.Style = Steema.TeeChart.Tools.CursorToolStyles.Both; cursorTool.Pen.Style = System.Drawing.Drawing2D.DashStyle.Dash; cursorTool.Pen.Color = Color.Black; cursorTool.FollowMouse = true; cursorTool.Change += CursorTool_Change; //设置提示文本的信息 annotation = new Steema.TeeChart.Tools.Annotation(tChart.Chart); annotation.Shape.Font.Name = "Arial"; annotation.Shape.Font.Size = 12; annotation.Shape.Pen.Visible = true; annotation.Shape.Shadow.Visible = false; annotation.Shape.ShapeStyle = Steema.TeeChart.Drawing.TextShapeStyle.Rectangle; annotation.Position = Steema.TeeChart.Tools.AnnotationPositions.LeftBottom; annotation.TextAlign = StringAlignment.Center; for (int i = 0; i < tChart.Series.Count; i++) { tChart.Series[i].MouseEnter += Line_MouseEnter; tChart.Series[i].MouseLeave += Line_MouseLeave; } tChart.MouseLeave += TChart_MouseLeave; tChart.MouseEnter += TChart_MouseEnter;}/// <summary>/// 鼠标进入TeeChart的事件/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void TChart_MouseEnter(object sender, EventArgs e){ cursorTool.Chart=tChartCurve.Chart;}/// <summary>/// 鼠标离开TeeChart的事件/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void TChart_MouseLeave(object sender, EventArgs e){ cursorTool.Chart = null;}/// <summary>/// 当鼠标进入线条时，将TeeChart的cursorTool工具指示的线条设置为对应的线条/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void Line_MouseEnter(object sender, EventArgs e){ cursorTool.Series = sender as Steema.TeeChart.Styles.Series;}/// <summary>/// 当鼠标离开线条时，将TeeChart的cursorTool工具指示的线条设置为null/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void Line_MouseLeave(object sender, EventArgs e){ cursorTool.Series = null;}/// <summary>/// 鼠标指示工具改变事件/// </summary>/// <param name="sender"></param>/// <param name="e"></param>private void CursorTool_Change(object sender, Steema.TeeChart.Tools.CursorChangeEventArgs e){ try { Steema.TeeChart.Tools.CursorTool cursor = sender as Steema.TeeChart.Tools.CursorTool; if (cursor != null && cursor.Series != null) { annotation.Text = string.Format("({0}，{1})", cursor.XValue.ToString("f1"), cursor.YValue.ToString("f1")); annotation.Top = cursor.Series.GetVertAxis.CalcYPosValue(InterpolateLineSeries(cursor.Series, cursor.XValue)); annotation.Left = tChartCurve.Axes.Bottom.CalcXPosValue(cursor.XValue); annotation.Top -= 20;//将文本放在鼠标上方 SizeF size = this.CreateGraphics().MeasureString(annotation.Text, new Font(annotation.Shape.Font.Name, annotation.Shape.Font.Size)); if (annotation.Left + size.Width + 12 >= annotation.Chart.Width) { annotation.Left -= (int)size.Width + 12;//防止文本标签超出右边界而看不全 } } else { //将其设置到控件外部 annotation.Text = ""; annotation.Top = annotation.Chart.Height + 5; annotation.Left = annotation.Chart.Width + 5; } } catch (Exception ex) { annotation.Text = ex.Message; annotation.Top = 5; annotation.Left = 5; }}/// <summary>/// 计算某一点的Y值坐标/// </summary>/// <param name="series">曲线</param>/// <param name="xvalue">对应的X轴的值</param>/// <returns>计算得到的对应的Y轴的值</returns>private double InterpolateLineSeries(Steema.TeeChart.Styles.Series series, double xvalue){ try { int index; for (index = series.FirstVisibleIndex; index <= series.LastVisibleIndex; index++) { if (index == -1 || series.XValues.Value[index] > xvalue) break; } // safeguard if (index < 1) { index = 1; } else if (index >= series.Count) { index = series.Count - 1; } // y=(y2-y1)/(x2-x1)*(x-x1)+y1 double dx = series.XValues[index] - series.XValues[index - 1]; double dy = series.YValues[index] - series.YValues[index - 1]; if (dx != 0.0) { return dy * (xvalue - series.XValues[index - 1]) / dx + series.YValues[index - 1]; } else { return 0.0; } } catch (Exception ex) { Console.WriteLine(ex.Message); return 0.0; }}

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