Add QT GUI to Python for plotting graphics

Qt framework (with QT Creator IDE) can be used to create a fancy interfaces for Python GUI application. Plotting graphics on a GUI is possible with pyqtgraph library.

Installing pyqtgraph –
There are several ways of installing pyqtgraph depending on your needs.

If you are using Anaconda you can install with:

conda install -c anaconda pyqtgraph

Or with pip command:

pip install pyqtgraph

Creation of plot widgets with QT Creator –

Add the buttons, text areas and other stuffs as usually done with QT Creator. To create a plot area you need to follow the steps:

1. Add widget to UI and give it a proper name like “widgetSignal”
2. Promote the widget to pyqtgraph

Load UI to Python –

1. In your python code call the UI you created with QT Creator.
2. Create a sin wave for plotting
3. Draw the graph on UI

from PyQt5 import QtWidgets, uic
import sys
import numpy as np

class MainWindow(QtWidgets.QMainWindow):

    def __init__(self, *args, **kwargs):
        super(MainWindow, self).__init__(*args, **kwargs)
         # Load the UI Page
        self. ui = uic.loadUi('mainwindow.ui', self)
        # Create a sin wave
        x_time = np.arange(0, 100, 0.1);
        y_amplitude = np.sin(x_time)

        pltSignal = self.widgetSignal
        pltSignal.clear()
        pltSignal.setLabel('left', 'Signal Sin Wave', units ='(V)')
        pltSignal.setLabel('bottom', 'Time', units ='(sec)')
        pltSignal.plot(x_time, y_amplitude, clear = True)

        self.ui.show()

def main():
    app = QtWidgets.QApplication(sys.argv)
    window = MainWindow()
    sys.exit(app.exec_())

if __name__ == '__main__':
    main()

Output: