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PyQt5 Matplotlib

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Matplotlib plots can be included in a PyQt5 application.
Several imports need to be added:


from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
import matplotlib.pyplot as plt

We create a widget called PlotCanvas that includes the Matplotlib plot.

pyqt5-matplotlib Matplot plot in PyQt5 window

PyQt5 Matplotlib example
The example below embeds a matplotlib plot in a PyQt5 window.


import sys

from PyQt5.QtWidgets import QApplication, QMainWindow, QMenu, QVBoxLayout, QSizePolicy, QMessageBox, QWidget, QPushButton
from PyQt5.QtGui import QIcon


from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
import matplotlib.pyplot as plt

import random

class App(QMainWindow):

def __init__(self):
super().__init__()
self.left = 10
self.top = 10
self.title = 'PyQt5 matplotlib example - pythonspot.com'
self.width = 640
self.height = 400
self.initUI()

def initUI(self):
self.setWindowTitle(self.title)
self.setGeometry(self.left, self.top, self.width, self.height)

m = PlotCanvas(self, width=5, height=4)
m.move(0,0)

button = QPushButton('PyQt5 button', self)
button.setToolTip('This s an example button')
button.move(500,0)
button.resize(140,100)

self.show()


class PlotCanvas(FigureCanvas):

def __init__(self, parent=None, width=5, height=4, dpi=100):
fig = Figure(figsize=(width, height), dpi=dpi)
self.axes = fig.add_subplot(111)

FigureCanvas.__init__(self, fig)
self.setParent(parent)

FigureCanvas.setSizePolicy(self,
QSizePolicy.Expanding,
QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)
self.plot()


def plot(self):
data = [random.random() for i in range(25)]
ax = self.figure.add_subplot(111)
ax.plot(data, 'r-')
ax.set_title('PyQt Matplotlib Example')
self.draw()

if __name__ == '__main__':
app = QApplication(sys.argv)
ex = App()
sys.exit(app.exec_())

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Leave a Reply:




hasjalilg . Sun, 12 Feb 2017

The example works well if we change the import instructions as:


import sys
from PyQt5.QtWidgets import QApplication, QMainWindow, QMenu, QVBoxLayout, QSizePolicy, QMessageBox, QWidget, QPushButton
from PyQt5.QtGui import QIcon
#******************************************************************
import matplotlib
matplotlib.use("Qt5Agg")
#******************************************************************
from PyQt5 import QtCore
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
import matplotlib.pyplot as plt
import random
#******************************************************************

Stuart Walsh Wed, 14 Jun 2017

Hmm, it doesn't work. Comes up with this problem:

ImportError: No module named 'matplotlib'

Does anyone have a fix for this please?

Stuart

Frank Thu, 15 Jun 2017

The module matplotlib is missing.
Installation instructions for this module can be found here: https://matplotlib.org/users/installing.html