MS Chart Control 中需要垂直光标提示

Question

我有一个显示一些时间序列数据的折线图控件。我想在线图上放置几个垂直光标，显示该图的重要点。据我所知，控件中有两个可用的光标，一个是垂直的，一个是水平的。我不需要光标可移动，我只想精确定位特定位置。在 MS Chart Control 中实现这一目标的首选方法是什么？

Answer 1

使用垂直线注释。

double xPosition1 = 5;
chart.VerticalLineAnnotation annotationVerticalLine1 = new chart.VerticalLineAnnotation();
            annotationVerticalLine1.AxisX = chart1.ChartAreas["ChartArea1"].AxisX;
            annotationVerticalLine1.AxisY = chart1.ChartAreas["ChartArea1"].AxisY;
            annotationVerticalLine1.IsSizeAlwaysRelative = false;
            annotationVerticalLine1.AnchorX = xPosition1;
            annotationVerticalLine1.IsInfinitive = true;
            annotationVerticalLine1.ClipToChartArea = chart1.ChartAreas["ChartArea1"].Name;
            annotationVerticalLine1.LineColor = Color.Red; 
            annotationVerticalLine1.LineWidth = 1;
            chart1.Annotations.Add(annotationVerticalLine1);

            double xPosition2 = 10;
            chart.VerticalLineAnnotation annotationVerticalLine2 = new chart.VerticalLineAnnotation();
            annotationVerticalLine2.AxisX = chart1.ChartAreas["ChartArea1"].AxisX;
            annotationVerticalLine2.AxisY = chart1.ChartAreas["ChartArea1"].AxisY;
            annotationVerticalLine2.IsSizeAlwaysRelative = false;
            annotationVerticalLine2.AnchorX = xPosition2;
            annotationVerticalLine2.IsInfinitive = true;
            annotationVerticalLine2.ClipToChartArea = chart1.ChartAreas["ChartArea1"].Name;
            annotationVerticalLine2.LineColor = Color.Red;
            annotationVerticalLine2.LineWidth = 1;
            chart1.Annotations.Add(annotationVerticalLine2);

Answer 2

尝试这样：

using System.Windows.Forms.DataVisualization.Charting;
...

this.chart1.CursorPositionChanging += new System.Windows.Forms.DataVisualization.Charting.Chart.CursorEventHandler(this.chart1_CursorPositionChanging);
...

// Edit Controls
private System.Windows.Forms.TextBox CursorX;
private System.Windows.Forms.TextBox CursorY;

// Cursor Position Changing Event
private void chart1_CursorPositionChanging(object sender, System.Windows.Forms.DataVisualization.Charting.CursorEventArgs e)
{
    SetPosition( e.Axis, e.NewPosition );
}

// Set Cursor Position to Edit control.
private void SetPosition( Axis axis, double position )
{
    if( double.IsNaN( position ) )
        return;

    if( axis.AxisName == AxisName.X )
    {
        // Convert Double to DateTime.
        DateTime dateTimeX = DateTime.FromOADate( position );

        // Set X cursor position to edit Control
        CursorX.Text = dateTimeX.ToLongDateString();
    }
    else
    {
        // Set Y cursor position to edit Control
        CursorY.Text = position.ToString();
    }
}
...