How to embed matplotlib in pyqt - for Dummies

Question

I am currently trying to embed a graph I want to plot in a pyqt4 user interface I designed  As I am almost completely new to programming - I do not get how people did the embedding in the examples I found - this one  at the bottom   and that one   It would be awesome if anybody could post a step-by-step explanation or at least a very small  very simple code only creating e g  a graph and a button in one pyqt4 GUI

User · Answer

For those looking for a dynamic solution to embed Matplotlib in PyQt5 (even plot data using drag and drop). In PyQt5 you need to use super on the main window class to accept the drops. The dropevent function can be used to get the filename and rest is simple:

def dropEvent(self,e):
        """
        This function will enable the drop file directly on to the 
        main window. The file location will be stored in the self.filename
        """
        if e.mimeData().hasUrls:
            e.setDropAction(QtCore.Qt.CopyAction)
            e.accept()
            for url in e.mimeData().urls():
                if op_sys == 'Darwin':
                    fname = str(NSURL.URLWithString_(str(url.toString())).filePathURL().path())
                else:
                    fname = str(url.toLocalFile())
            self.filename = fname
            print("GOT ADDRESS:",self.filename)
            self.readData()
        else:
            e.ignore() # just like above functions

For starters the reference complete code gives this output:

User · Answer

It is not that complicated actually  Relevant Qt widgets are in matplotlib backends backend qt4agg  FigureCanvasQTAgg and NavigationToolbar2QT are usually what you need  These are regular Qt widgets  You treat them as any other widget  Below is a very simple example with a Figure  Navigation and a single button that draws some random data  I ve added comments to explain things   import sys from PyQt4 import QtGui  from matplotlib backends backend qt4agg import FigureCanvasQTAgg as FigureCanvas from matplotlib backends backend qt4agg import NavigationToolbar2QT as NavigationToolbar from matplotlib figure import Figure  import random  class Window QtGui QDialog       def   init   self  parent None           super Window  self    init   parent             a figure instance to plot on         self figure   Figure              this is the Canvas Widget that displays the  figure            it takes the  figure  instance as a parameter to   init           self canvas   FigureCanvas self figure             this is the Navigation widget           it takes the Canvas widget and a parent         self toolbar   NavigationToolbar self canvas  self             Just some button connected to  plot  method         self button   QtGui QPushButton  Plot           self button clicked connect self plot             set the layout         layout   QtGui QVBoxLayout           layout addWidget self toolbar          layout addWidget self canvas          layout addWidget self button          self setLayout layout       def plot self               plot some random stuff               random data         data    random random   for i in range 10              create an axis         ax   self figure add subplot 111             discards the old graph         ax clear              plot data         ax plot data    -              refresh canvas         self canvas draw    if   name         main         app   QtGui QApplication sys argv       main   Window       main show        sys exit app exec       Edit   Updated to reflect comments and API changes    NavigationToolbar2QTAgg changed with NavigationToolbar2QT   Directly import Figure instead of pyplot   Replace deprecated ax hold False  with ax clear

User · Answer

Below is an adaptation of previous code for using under PyQt5 and Matplotlib 2 0  There are a number of small changes  structure of PyQt submodules  other submodule from matplotlib  deprecated method has been replaced      import sys from PyQt5 QtWidgets import QDialog  QApplication  QPushButton  QVBoxLayout  from matplotlib backends backend qt5agg import FigureCanvasQTAgg as FigureCanvas from matplotlib backends backend qt5agg import NavigationToolbar2QT as NavigationToolbar import matplotlib pyplot as plt  import random  class Window QDialog       def   init   self  parent None           super Window  self    init   parent             a figure instance to plot on         self figure   plt figure              this is the Canvas Widget that displays the  figure            it takes the  figure  instance as a parameter to   init           self canvas   FigureCanvas self figure             this is the Navigation widget           it takes the Canvas widget and a parent         self toolbar   NavigationToolbar self canvas  self             Just some button connected to  plot  method         self button   QPushButton  Plot           self button clicked connect self plot             set the layout         layout   QVBoxLayout           layout addWidget self toolbar          layout addWidget self canvas          layout addWidget self button          self setLayout layout       def plot self               plot some random stuff               random data         data    random random   for i in range 10              instead of ax hold False          self figure clear              create an axis         ax   self figure add subplot 111             discards the old graph           ax hold False    deprecated  see above            plot data         ax plot data    -              refresh canvas         self canvas draw    if   name         main         app   QApplication sys argv       main   Window       main show        sys exit app exec

[python] How to embed matplotlib in pyqt - for Dummies

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