Hairlines

This article applies to version 4.16 and later of IFS OI Explorer. Note, some screenshots on this page may be of earlier versions. For help on earlier versions, see Release History.

The hairline allows you to see the data values on a chart, embedded trend or trend, at a particular point in time.

Hairline Features

The hairline can show:

• The timestamp of the data point
• The current value of the trace or series
• The name of the trace or series
• The difference between hairline values (for two or more hairlines)
• Comments button
• Time Windows button (only available on a trend hairline)

Note that hairlines can be configured to hide some of these items (see Hairline Display Options).

When a trend or embedded trend, has Dual hairlines selected, and there are two hairlines on the trend, then Dual Hairline Statistics options (e.g. 'Max', 'Min', 'Standard Deviation') are available in the trend's Trace Table, allowing you to make further comparisons between data at the points marked by the two hairlines.

A hairline:

1.   Time stamp 2.   Pill - hairline information selected in the configuration; the background color matches the trace/series color 3.   Hairline 4.   Pill - additional information is available on hover

A hairline pill:

1.   Value - trace value at this point 2.   Value difference 3.   Time Windows - opens the time windows panel 4.   Comments - opens the explore panel comments view 5.   Trace name

Note: The Value Difference is only displayed when there are two or more hairlines. The value difference applies to a hairline's values, and those of the hairline immediately to its left.

Hairline Behaviour

• For dot series, interpolation for values in hairlines is Last Known Value.
• If a series/trace contains no value (or a null value), the pill will not appear.

Hairline Display Options

By selecting different configuration options, you can determine what is displayed on the hairline pill.

Chart	Trend	Embedded Trend
		Page configuration: Toolbar configuration:

When a chart or embedded trend is configured to allow hairlines, the hairline information boxes (pills) are sometimes unnecessary and can obscure other information, especially if the chart is small.

If you want a small chart/trend to be used in conjunction with one or more larger charts, for example, you could configure the hairlines on the smaller chart to show values only, and the hairlines on the larger charts to show values and timestamp.

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Interacting with a Hairline

Add a hairline

• Click on a hairline-enabled chart or trend. The hairline is added where you click.

  

Move a hairline

• To move a hairline left or right, click the hairline and drag it to the left or right.
• When you move hairlines so that they approach each other, the information boxes flip so that the values are not obscured.

  

Hover

• Hover over a data item's information box to see more information on the data item.

  

Select an axis

• When both Y-axes are enabled, hovering over one of the axes causes the hairline on the non-selected axis to fade.

  

Add comments

• Click the comment icon to view or add comments for the data item.

  

Read more: Using Comments for Collaboration

Close a hairline

• Click the Close button at the end of the timestamp box.

  

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Legacy Hairline

Administrators can enable the legacy hairline, in the web.config file, for users who prefer that style.

In this mode, the hairline information is shown together in one box, with the tag name always visible and displayed on the same line as the value. The order of the values follows the order of the traces.

When hovering over the information box, truncated names are fully displayed. An up/down arrow also appears to allow the box to be moved up or down along the hairline.

This setting affects hairlines for all users, and in all chart components, embedded trends, and trends.

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Release History

• Hairlines 4.16 (this release)
  • Legacy hairline pill

• Hairlines 4.12
  • Name on hairline pill

• Hairlines 4.9
• Hairlines 4.6.2
• Hairlines 4.5.5