Mouseover Series Labels

[Numaan]

While mouseovers show tooltips on series' points, I'd like to be able to show the details of the series point in a separate label on the graph somewhere.

How can I attach an event to the line of the graph to show the tooltip/data in the label on mouseover?

Thank you in advance.

[Evgenia]

Hi Numaan,

You can handle the ItemToolTipOpening event of the ChartArea and set your Label's Content to the Tooltip's content. To get the X and Y values of the cursor's current position - the ConvertPhysicalUnitsToData method is used:

void ItemToolTipOpening(ItemToolTip2D tooltip, ItemToolTipEventArgs e)

   {
     ChartArea chartArea = RadChart1.DefaultView.ChartArea;

     Point physical = e.MouseData.GetPosition(RadChart1.DefaultView.ChartArea.ChildrenOfType<ClipPanel>()[0] as Panel);

     double x = chartArea.AxisX.ConvertPhysicalUnitsToData(physical.X);

     double y = chartArea.AxisY.ConvertPhysicalUnitsToData(physical.Y);

     tooltip.Content = string.Format("X: {0:0.0} Y={1:0.0}", x, y);
     label1.Content = tooltip.Content;
   }

For more information about the ItemTooltipOpening event - refer to our help topic.

Best wishes, Evgenia
the Telerik team