QT GUI Time Sink

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A graphical sink to display multiple signals in time.

This block does not support C++ output, so it cannot be used when the output language of a flowgraph in GRC is C++.

This is a QT-based graphical sink that takes sets of float or complex streams and plots them in the time domain. Each signal is plotted with a different color, and options of the block can be used to change the label and color for a given input number.

The sink supports plotting streaming float data, complex data or messages. The message port is named "in". The two modes cannot be used simultaneously, and should be set to 0 when using the message mode. GRC handles this issue by providing the "Float Message" type that removes the streaming port(s).

There are many parameters, across three different tabs of General, Trigger and Config, most of which are self-explanatory.


(R): Run-time adjustable


  • Complex
  • Float
  • Complex Message
  • Float Message
The name of the plot. It is shown on the top of the plot in the output window.
Y Axis Label
The Y Axis Label to be added to the plot. The x-axis label is 'Time', which is added automatically to the plot.
Y Axis Unit
The unit of data to be shown infront of the Y Axis Label. It is shown in round brackets.
Number of Points
Sample Rate (R)
  • Yes: Adds a grid to the plot
  • No: No grid added to the plot
  • Yes: Automatically adjust the maximum and minimum y axis values of the plot to contain the entire plot along y axis. Choosing this option overrides the values specified in Y min and Y max input parameters.
  • No: Does not automatically adjust the plot. The values of Y min and Y max are used to create the plot.
Y min (R)
The minimum y axis value to be automatically shown in the plot
Y max (R)
The maximum y axis value to be automatically shown in the plot
Number of Inputs
Total number of input ports to be created on this block
Update Period (R)
The period after which the plot data will be updated
Disp. Tags
  • Yes: Display the tags in the plot
  • No: Do not display the tags in the plot
GUI Hint
This parameter controls the placement of the plot in the output window. See GUI Hint for info about how to organize multiple QT GUIs.

Example Flowgraph[edit]


Control Panel & Triggering[edit]

Qt GUI Time Sink showing its control panel, with trigger settings.


Source Files[edit]

C++ files
Header files
Public header files
Block definition