tChart光标捕捉

   #region 光标捕捉
    /// 

    /// 点击鼠标保存文本
    /// 
    private Dictionary DicAnnotation = new Dictionary();
    /// 

    /// TeeChart线条的指示工具
    /// 
    Steema.TeeChart.Tools.CursorTool cursorTool;
    /// 

    /// 鼠标指示显示的文本
    /// 
    private Steema.TeeChart.Tools.Annotation annotation;
    /// 

    /// 初始化线条的提示工具信息
    /// 
    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.Active = false;
        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 = 9;
        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;
        annotation.Active = false;

        for (int i = 0; i < tChart.Series.Count; i++)
        {
            tChart.Series[i].MouseEnter += Line_MouseEnter;
            tChart.Series[i].MouseLeave += Line_MouseLeave;
            tChart.Series[i].Click += Line_Click;
        }

        tChart.MouseLeave += TChart_MouseLeave;
        tChart.MouseEnter += TChart_MouseEnter;
    }

    private void Line_Click(object sender, MouseEventArgs e)
    {
        Point p = new Point(e.X, e.Y);
        foreach (var item in DicAnnotation)
        {
            if (e.X - item.Key.X > -20 && e.X - item.Key.X < 20 && e.Y - item.Key.Y > -20 && e.Y - item.Key.Y < 20)
            {
                p = item.Key;
                break;
            }
        }
        if (DicAnnotation.ContainsKey(p))
        {
            var anno = DicAnnotation[p];
            DicAnnotation.Remove(p);
            anno.Dispose();
        }
        else
        {
            var anno = annotation.Clone() as Steema.TeeChart.Tools.Annotation;
            DicAnnotation.Add(p, anno);
        }
    }

    /// 

    /// 鼠标进入TeeChart的事件
    /// 
    /// 
    /// 
    private void TChart_MouseEnter(object sender, EventArgs e)
    {
        cursorTool.Chart = this.tChartMinddle.Chart;
    }

    /// 

    /// 鼠标离开TeeChart的事件
    /// 
    /// 
    /// 
    private void TChart_MouseLeave(object sender, EventArgs e)
    {
        cursorTool.Chart = null;
    }

    /// 

    /// 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
    /// 
    /// 
    /// 
    private void Line_MouseEnter(object sender, EventArgs e)
    {
        cursorTool.Series = sender as Steema.TeeChart.Styles.Series;
    }

    /// 

    /// 当鼠标离开线条时，将TeeChart的cursorTool工具指示的线条设置为null
    /// 
    /// 
    /// 
    private void Line_MouseLeave(object sender, EventArgs e)
    {
        cursorTool.Series = null;
    }
    /// 

    /// 鼠标指示工具改变事件
    /// 
    /// 
    /// 
    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 = tChartMinddle.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;
        }
    }
    /// 

    /// 计算某一点的Y值坐标
    /// 
    /// 曲线
    /// 对应的X轴的值
    /// 计算得到的对应的Y轴的值
    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)
        {
            Log.Error(ex.Message);
            return 0.0;
        }
    }

    private void tChartMinddle_UndoneZoom(object sender, EventArgs e)
    {
        DicAnnotation.Clear();
    }

    private void tChartMinddle_Zoomed(object sender, EventArgs e)
    {
        DicAnnotation.Clear();
    }

    #endregion