Python - PyQt Matplotlib plot positioning

Question

I am currently making a GUI where I want to have some sliders, some buttons and some plots. I am struggling to position the Matplotlib plot where I want it. The plot is in a QVBoxLayout and I have tried putting this inside a Widget without success. I want to be able to choose the position and size of the plot

Here is what I have now:

Current plot

And here is what I want, where I can define position and size so I have space for the other controls:

What I am looking for, where I can define position and size

Here is basic code:

import sys
import numpy as np
from PyQt4 import QtGui, QtCore
# import inspect
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.backends.backend_qt4agg import NavigationToolbar2QTAgg as NavigationToolbar
import matplotlib.pyplot as plt

class Example(QtGui.QWidget):

    def __init__(self):
        super(Example, self).__init__()

        self.initUI()

    def initUI(self):

        #PLOTTING
        self.figure = plt.figure()
        self.canvas = FigureCanvas(self.figure)
        self.toolbar = NavigationToolbar(self.canvas, self)
        self.plot()

        # set the layout
        layout = QtGui.QVBoxLayout()
        layout.addWidget(self.toolbar)
        layout.addWidget(self.canvas)
        self.setLayout(layout)

        #WINDOW PROPERTIES
        self.resize(800,800)
        self.setWindowTitle('Waveguide Array')
        self.setWindowIcon(QtGui.QIcon('flavicon.png'))
        self.show()

    def plot(self):
        ''' plot some random stuff '''
        data = [np.random.random() for i in range(10)]
        ax = self.figure.add_subplot(111)
        ax.hold(False)
        ax.plot(data, '*-')
        self.canvas.draw()

    # def update_plot(self):

def main():

    app = QtGui.QApplication(sys.argv)
    ex = Example()
    sys.exit(app.exec_())


if __name__ == '__main__':
    main()

Thanks for the help!

Why not use a QGridLayout as the layout, add the canvas to a widget, and add the widget to the GridLayout? Just remember to set the widget either to have a maximumSize() that's roughly a quarter of your view size, or add other widgets and make sure all scale proportionally. — Alex Huszagh
– Alex Huszagh, Commented Apr 27, 2016 at 0:33

Robert Chapman · Accepted Answer · 2016-04-28 02:06:09Z

2

Here is a solution. Make a plot widget inside of the main widget, seems to work and can control position with setGeometry.

self.main_widget = QtGui.QWidget(self)
self.plot_widget = QtGui.QWidget(self.main_widget)
self.plot_widget.setGeometry(250,180,500,600)
self.figure = plt.figure()
self.plotting = FigureCanvas(self.figure)
self.plot()
plot_box = QtGui.QVBoxLayout()
plot_box.addWidget(self.plotting)
self.plot_widget.setLayout(plot_box)

answered Apr 28, 2016 at 2:06

Robert Chapman

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