Embedding the matplotlib toolbar in pyqt4 using matplotlib custom widget

Question

I have been following this chapter to embed a matplotlib Figure into a QTdesigner generated GUI. So far it works, but I need to also embed the toolbar within the GUI to manipulate the plot and save it. How can I modify the example code to add the toolbar? I have googled many sources and they all have their own custom code that does not work with the example given in the book.

I believe I need to modify the custom widget class. The code for the widget class is here:

Original code (from book):

from PyQt4 import QtGui
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas

from matplotlib.figure import Figure

class MplCanvas(FigureCanvas):
    def __init__(self):
        self.fig = Figure()       
        self.ax = self.fig.add_subplot(111)
        FigureCanvas.__init__(self, self.fig)
        FigureCanvas.setSizePolicy(self,
        QtGui.QSizePolicy.Expanding,
        QtGui.QSizePolicy.Expanding)
        FigureCanvas.updateGeometry(self)

class MplWidget(QtGui.QWidget):
    def __init__(self, parent = None):
        QtGui.QWidget.__init__(self, parent)
        self.canvas = MplCanvas()      
        self.vbl = QtGui.QVBoxLayout()
        self.vbl.addWidget(self.canvas)     
        self.setLayout(self.vbl)

My question is how can I add code such that the toolbar will display with the canvas?

I know I must import the api using:

from matplotlib.backends.backend_qt4agg import NavigationToolbar2QTAgg as NavigationToolbar

Do I need to create a new class and/or custom widget to put it in?

Ok, after more fiddling around and looking at link, I modified the class MplWidget to: class MplWidget(QtGui.QWidget): def __init__(self, parent = None): QtGui.QWidget.__init__(self, parent) self.canvas = MplCanvas() self.mpl_toolbar = NavigationToolbar(self.canvas, self) self.vbl = QtGui.QVBoxLayout() self.vbl.addWidget(self.canvas) self.vbl.addWidget(self.mpl_toolbar) self.setLayout(self.vbl) And now it works. Thanks! — railsnoob123
– railsnoob123, Commented Aug 30, 2013 at 19:04

tacaswell · Accepted Answer · 2014-03-17 15:24:33Z

2

Ok, after more fiddling around and looking at link, I modified the class MplWidget to:

class MplWidget(QtGui.QWidget):
     def __init__(self, parent = None):
        QtGui.QWidget.__init__(self, parent)
        self.canvas = MplCanvas()
        self.mpl_toolbar = NavigationToolbar(self.canvas, self)
        self.vbl = QtGui.QVBoxLayout()
        self.vbl.addWidget(self.canvas)
        self.vbl.addWidget(self.mpl_toolbar)
        self.setLayout(self.vbl)

And now it works. Thanks!

edited Mar 17, 2014 at 15:24

tacaswell

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answered Sep 1, 2013 at 23:23

railsnoob123

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