Hi Alina,

You can use axis cursors instead of const lines - they are faster and do not affect the HiTest. You can check the following example:

All Examples\Interactivity\Tools\Data Cursor Tool

Hope this helps - let us know if you meet any problems.

Hi Alina,

In general you need to two more things to make this work:

1. Add a NDataCursorTool to the chart controller.
2. Specify active chart.

The following code shows how to achieve this:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using Nevron.Chart;
using Nevron.GraphicsCore;
using Nevron.Chart.WinForm;

namespace WindowsFormsApplication7
{
 public partial class Form1 : Form
 {
  public Form1()
  {
   InitializeComponent();
  }

  NChart _cartesianChart;

  private void Form1_Load(object sender, EventArgs e)
  {
   _cartesianChart = (NCartesianChart)nChartControl1.Charts[0];

   NBarSeries bar = new NBarSeries();

   bar.Values.Add(10);
   bar.Values.Add(20);
   bar.Values.Add(30);

   _cartesianChart.Series.Add(bar);

   nChartControl1.MouseMove +=new MouseEventHandler(nChartControl1_MouseMove);
   nChartControl1.MouseLeave +=new EventHandler(nChartControl1_MouseLeave);

   nChartControl1.Controller.Selection.SelectedObjects.Add(_cartesianChart);
   nChartControl1.Controller.Tools.Add(new NDataCursorTool());
  }

  public void nChartControl1_MouseMove(object sender, MouseEventArgs e)
  {
   NAxis xAxis = _cartesianChart.Axis((int)StandardAxis.PrimaryX);
   if (xAxis.Cursors.Count == 0)
   {
    NAxisCursor cursor = new NAxisCursor();
    cursor.BeginEndAxis = (int)StandardAxis.PrimaryY;
    cursor.StrokeStyle = new NStrokeStyle(1, Color.Red);
    cursor.SynchronizeOnMouseAction = MouseAction.Move;
    cursor.ValueSnapper = new NAxisRulerClampSnapper();
    xAxis.Cursors.Add(cursor);
   }
   NAxis yAxis = _cartesianChart.Axis((int)StandardAxis.PrimaryY);
   if (yAxis.Cursors.Count == 0)
   {
    NAxisCursor cursor = new NAxisCursor();
    cursor.BeginEndAxis = (int)StandardAxis.PrimaryX;
    cursor.StrokeStyle = new NStrokeStyle(1, Color.Red);
    cursor.SynchronizeOnMouseAction = MouseAction.Move;
    cursor.ValueSnapper = new NAxisRulerClampSnapper();
    yAxis.Cursors.Add(cursor);
   }
   _cartesianChart.Refresh();
  }
  public void nChartControl1_MouseLeave(object sender, EventArgs e)
  {
   _cartesianChart.Axis(StandardAxis.PrimaryX).Cursors.Clear();
   _cartesianChart.Axis(StandardAxis.PrimaryY).Cursors.Clear();
   nChartControl1.Invalidate();
  }
 }
}

Let us know if you meet any problems.

Hi Ereona,

You cannot paint the data point over the cursor as cursors are painted in overlay mode for performance reasons. Regarding the stop of the cursor update - the cursors will follow the mouse only when the current selection contains the chart that defines them. When you click outside the chart the current selection does not contain it and therefore the cursors stop to update (notice in the that the code above the current selection is configured via code:

nChartControl1.Controller.Selection.SelectedObjects.Add(_cartesianChart);

We recommend to use this approach and remove the selector tool from the controller.

Hope this helps - let us know if you meet any problems.