8.9. The “Plots” Window
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## 8.9. The “Plots” Window

Lets you plot display filter field values over time.

Figure 8.8. The “Plots” window

As shown above, this window contains a plot drawing area along with a customizable list of plots. Plots are saved in your current profile. Each plot shows the value of the specified field (see Y Field below) at each point in time. Hovering over the plot shows the packet number of the selected plot at any given time. Clicking on the plot takes you to the corresponding packet in the packet list. You can drag the plots around with a left click and zoom on a specific area with a right click.

Individual plots can be configured using the following options:

Enabled
  Draw or don’t draw this plot.
Group #
  If you don’t want all plots on the same graph, you can use this field to group them. Each one will be shown in a distinct graph.
Plot Name
  The name of this plot.
Display Filter
  Limits the plot to packets that match this filter.
Color
  The color to use for plotting the plot’s lines or points.
Style
  How to visually represent the plot’s data, e.g., by drawing a line, circle, plus, etc.
Y Field
  The display filter field from which to extract values for the Y axis.
Y Axis Factor
  Scale the Y axis for this plot by multiplying by a constant factor, e.g. to present multiple plots at a similar scale.

The plot as a whole can be configured using the controls under the plot list:

+
  Add a new plot.
-
  Remove the selected plot(s).
Copy
  Copy the selected plot(s).
⌃
  Move the selected plot(s) up in the list.
⌄
  Move the selected plot(s) down in the list.
Clear
  Remove all plots.
Automatic updates
  Redraw each plot automatically.
Time origin
  Switch between showing the time relative to first data point and time relative to capture start (not available in pcapng).
Log scale
  Switch between linear and logarithmic Y axis.
Crosshairs
  Enable/disable the crosshairs cursor.
Top axis
  Show the axis scale also on top of the plot.
Enable legend
  Show a plot legend.
Multiple Value Axes
  Use multiple Y-axes for displaying data on different scales.
Enable auto scroll
  Goes automatically to the last drawn points.
Add Marker
  Add marker with x-axis of current mouse position.
Move Marker
  Moves the selected marker to a specific x-axis position provided by the user.
Show Pos Marker
  Show or hide the pos marker, you can then change it to the desired position by dragging and dropping it or left click.
Show Differences
  User can show or hide the difference between markers.
Show Data Point Marker
  User can show or hide data point marker.
Delete Marker
  Delete the selected marker.
Delete All
  Delete all markers, including the Pos Marker "P".

The main dialog buttons along the bottom let you do the following:

Help will take you to this section of the User’s Guide.

Reset will autoscale the axes to fully display all plots.

Copy will copy values from selected plot to the clipboard in CSV (Comma Separated Values) format.

Copy from will let you copy plots from another profile to the current dialog.

Close will close this dialog.

Save As…​ will save the currently displayed plot as an image.

| Tip
You can see a list of useful keyboard shortcuts by right-clicking on the plot.

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