如何让 FigureCanvas 在嵌入在 pyqt GUI 中的 matplotlib 小部件中填充整个图形？

Question

I have attempted to make a GUI with embedded matplotlib widget in it. I just need the figure to be completely filled by the FigureCanvas, I have tried about 100 different things and nothing has changed the size of the canvas one bit. I left a few of my attempts in the code denoted by "#useless" to let you know that I tried it and it had no impact. Please help.

import sys
from PyQt4 import QtGui
from matplotlib import pyplot as plt
from matplotlib.figure import Figure
from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas

class Terminal(QtGui.QDialog):
def __init__(self, parent=None):
    try:        
        super(Terminal, self).__init__(parent)

        self.resize(1000,800)
        self.figure = plt.figure(facecolor='black')
        self.canvas = FigureCanvas(self.figure)
        self.canvas.autoFillBackground()#useless
        self.myComboBox = QtGui.QComboBox()
        self.plotButton = QtGui.QPushButton('Plot')      
        self.xMplWidget = MatplotlibWidget(self.canvas)         
        self.plotButton.clicked.connect(self.plotCircles)

        layout = QtGui.QVBoxLayout()
        layout.addWidget(self.canvas)
        layout.addWidget(self.myComboBox)
        layout.addWidget(self.plotButton)
        policy = QtGui.QSizePolicy(QtGui.QSizePolicy.Expanding,QtGui.QSizePolicy.Expanding)#useless
        self.canvas.setSizePolicy = policy#useless
        layout.setStretchFactor(self.canvas, 1)#useless
        self.setLayout(layout)
        self.canvas.autoFillBackground()#useless
    except Exception as err:
        print("Error in Terminal.init: Other - ", err)


def createDashboard(self,oDashboard):
    print("DoStuff")

def plotCircles(self):
    print("DoStuff")        




class MatplotlibWidget(FigureCanvas):
    def __init__(self, parent=None, title='Title', xlabel='x label', ylabel='y label', dpi=100, hold=False):
    super(MatplotlibWidget, self).__init__(Figure())       
    self.setParent(parent)
    self.figure = Figure(dpi=dpi)
    self.canvas = FigureCanvas(self.figure)

    self.theplot = self.figure.add_subplot(111)
    self.theplot.set_title(title)
    self.theplot.set_xlabel(xlabel)
    self.theplot.set_ylabel(ylabel)


def plotChart(self,oOxyName):
    print("DoStuff")     


if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    main = Terminal()
    main.show()

    app.exec_()

Answer 1

I figured it out after continued studying. I had made a mess early on in the project and had failed to carefully reread my code when changing the initial design. The issue was that I was creating a canvas widget and passing that widget to the MplWidget. The MplWidget correctly had its own canvas, and therefor did not need an additional one passed to it. Essentially I was making the MplWidget within the canvas widget, rather than the MplWidget within the main form.

Here is the corrected code with notes on the corrections.

import sys
from PyQt4 import QtGui
from PyQt4.QtCore import Qt
from matplotlib import pyplot as plt
from matplotlib.figure import Figure
from matplotlib.backends.backend_qt4agg import (
    FigureCanvasQTAgg as FigureCanvas)

class Terminal(QtGui.QDialog):
    def __init__(self, parent=None):
        try:        
            super(Terminal, self).__init__(parent)

            self.resize(1000,800)
            self.figure = plt.figure(facecolor='black')
#This was creating a canvas which I was adding my widget to (bad idea)
#            self.canvas = FigureCanvas(self.figure)

            self.myComboBox = QtGui.QComboBox()
            self.plotButton = QtGui.QPushButton('Plot')      
            self.xMplWidget = MatplotlibWidget()         
            self.plotButton.clicked.connect(self.plotCircles)

            layout = QtGui.QVBoxLayout()
            #Needed to add my MatplotlibWidget, not a canvas widget, because the MPLWidget has its own canvas
            #layout.addWidget(self.canvas)
            layout.addWidget(self.xMplWidget) #This was added

            layout.addWidget(self.myComboBox)
            layout.addWidget(self.plotButton)
            self.setLayout(layout)
        except Exception as err:
            print("Error in Terminal.init: Other - ", err)


    def createDashboard(self,oDashboard):
        print("DoStuff")

    def plotCircles(self):
        print("DoStuff")        


class MatplotlibWidget(FigureCanvas):
    def __init__(self, parent=None, title='Title', xlabel='x label', ylabel='y label', dpi=100, hold=False):
        super(MatplotlibWidget, self).__init__(Figure())       
        self.setParent(parent)
        self.figure = Figure(dpi=dpi)
        self.canvas = FigureCanvas(self.figure)

        self.theplot = self.figure.add_subplot(111)
        self.theplot.set_title(title)
        self.theplot.set_xlabel(xlabel)
        self.theplot.set_ylabel(ylabel)


    def plotChart(self,oOxyName):
        print("DoStuff")     


if __name__ == '__main__':
    app = QtGui.QApplication(sys.argv)
    main = Terminal()
    main.show()

    app.exec_()