QT GUI Time Raster Sink

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This is a QT-based graphical sink that takes in numerical streams and plots a time_raster (spectrogram) plot.

This sink can plot messages that contain either uniform vectors of float 32 values (pmt::is_f32vector) or PDUs where the data is a uniform vector of float 32 values.

Note: This block does not limit the items per second it consumes, even though it has an "Update Rate" parameter; it will drop samples if the incoming data rate is higher than the product of the number of columns and the update rate. It is up to the user to choose an update rate that represents his processing needs.


(R): Run-time adjustable

Title for the plot
Sample Rate
Sample rate of signal
Num. Rows (R)
Number of rows to plot
Num. Cols (R)
Number of cols to plot
Int. min
Int. max
Multiplier (R)
Vector of floats as a scaling multiplier for each input stream
Offset (R)
Vector of floats as an offset for each input stream
Number of Inputs
Number of streams connected
Update Period (R)
GUI Hint
See GUI Hint for info about how to organize multiple QT GUIs
Axis Labels
Line Label
Line Color
Line Alpha
X-Axis Label, X-Axis Start Value, X-Axis End Value, Y-Axis Label, Y-Axis Start Value, Y-Axis End Value (New as of 3.9)
Allows the Time Raster to be able to look like a QT GUI Waterfall Sink if desired

Example Flowgraph

This flowgraph and output show a QT GUI Time Raster Sink.

Time raster.png

Interactive Demo

This flowgraph shows how to adjust processing rate in a pure simulation flow graph using the new-style Throttle block.

GRC Flowgraph

Demonstrate qt gui raster sink.png


Source Files

C++ files
Float input
Bit input
Header files
Float input
Bit input
Public header files
Float input
Bit input
Block definition