/// <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;}// safeguardif (index < 1){index = 1;}else if (index >= series.Count){index = series.Count - 1;}// y=(y2-y1)/(x2-x1)*(x-x1)+y1double 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;}
}