Plotter

The plotter allows to print measurement results using matplotlib.pyplot. It provides the class NBPlot that is decorated as a singleton, which means that it will be only initialized once and new initializations will refer to already existing object. NBPlot has two functions: * plot(data,title,xaxis-title,yaxis-title): It allows plotting the measured data * set_clear(clear): if set clear receives a ‘1’ every new data received will clean the chart before plotting the data, if set clear receives a ‘0’ data is added to the already existing charts.

Matplotlib is not thread save in order to allow a function to plot data while running multiprocessing is used. Splitting a program under windows means to run the entire code again until the split. Therefore, the first command line in ProberControl.py is the first initialization of the NBPlot() that split the program and starts one instance of ProcessPlotter() as a daemon with a pipe in between those two objects. rocessPlotter() enters a ‘while 1’ loop in __call__ constantly checking whether new data is ready in the pipe.