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Annotations

Reference for all annotation types, their features, and management.

Looking for a walkthrough?

See Analysing a Recording for step-by-step annotation during analysis, or Creating Report-Ready Plots for using annotations in professional output.

Annotation Types

Horizontal Lines

  • Mark reference levels, thresholds, or target values
  • Span the entire subplot width
  • Automatic intersection detection with plotted series
  • Constrained to vertical movement when dragged

Vertical Lines

  • Mark specific time points or events
  • Span the entire subplot height
  • Constrained to horizontal movement when dragged

Linked Vertical Lines

  • Mark a time point across all subplots simultaneously
  • Moving the line in any subplot moves it everywhere
  • Same color and style across all subplots

Text Annotations

  • Add explanatory text, labels, or callouts
  • Free movement in both directions when dragged
  • Editable text content

Creating Annotations

Right-click in any subplot → Add Annotations:

  1. Add horizontal line — created at cursor Y position
  2. Add vertical line — created at cursor X position
  3. Add linked vertical line — created at cursor X position in all subplots
  4. Add draggable text label — created at cursor position with editable text

Interaction

Dragging

Hover over an annotation until the cursor changes, then click and drag to reposition.

  • Horizontal lines: vertical movement only
  • Vertical lines: horizontal movement only
  • Text annotations: free movement
  • All constrained within the plot area

Context Menu

Right-click an annotation for options: - Delete: Remove the annotation - Edit text: Modify content (text annotations only)

Deletion

  • Right-click → Delete, or
  • Select annotation and press Delete key

Color System

Annotations use an automatic color assignment system with 10 colors:

Orange, Green, Red, Purple, Brown,
Pink, Gray, Olive, Teal, Magenta

Each new annotation of the same type gets the next color in the cycle.

Intersection Detection

Horizontal lines automatically detect intersections with plotted series:

  • Intersections calculated dynamically as lines are moved
  • Intersection points visually highlighted
  • Coordinates (time and value) displayed at each intersection
  • Works with all series in the subplot

Intersection detection on horizontal line

Linked Vertical Line Details

  • Synchronized across all subplots in the current plot tab
  • Axis tags update dynamically to show the current time value
  • Tags update in real time during drag operations

Persistence

  • Annotations are maintained during the session
  • Each annotation is tied to a specific subplot (except linked vertical lines, which span all subplots)
  • Annotations can be included in template definitions

Troubleshooting

Annotations Not Appearing

  1. Check if the annotation is outside the visible plot range (zoom out)
  2. Verify the annotation color contrasts with the background
  3. Try zooming in/out to refresh the display

Dragging Not Working

  1. Hover directly over the annotation line/text
  2. Ensure you click and hold before dragging
  3. Remember constraints: horizontal lines move vertically only, vertical lines move horizontally only