Hairlines

This article applies to P2 Explorer version 4.9 and later. For more, 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 shows:

  • 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 (note that for charts, this depends on whether the comments feature is enabled)

Note that hairlines on charts and embedded trends can be configured to hide some of these items (see Hairline Display Options).

When a 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.

The information box is coloured to match the colour of the trace/series.

Initially, the information box shows only 3 items: the data value, the value difference, and the comment icon.

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.

 

When you hover over the box, it expands to show the name of the data item.

 

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 information box will not appear.
  • For a chart, the comment icon is only visible when comments have been enabled in the configuration.

Hairline Display Options

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.

When configuring a chart or embedded trend in Studio, you can now select from the Hairline Display Option drop-down list:

  • Show Values And Timestamp
  • Show Timestamp Only
  • Show Values Only
  • None

This feature is especially useful if you want a small chart/trend for selecting the hairline 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.


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 add a 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.

 


Release History

One Comment:

  1. How does one set a hairline to an exact time date or set up the snap values

Comments are closed