connection of Pyside QPushButton and matplotlib

问题:

I'm trying to develop a very simple pyside/Qt program using matplotlib. I want that a graph is draw when a button is pressed. So far, I can draw something on the constructor, but I can't connect the Pyside event with matplotlib. Is there a way to do that?

import sys import platform  import numpy as np import PySide from PySide.QtGui import QApplication, QMainWindow, QTextEdit,\                          QPushButton,  QMessageBox, QWidget, QVBoxLayout from PySide import QtCore    __version__ = '0.0.1'   import matplotlib  matplotlib.use('Qt4Agg') matplotlib.rcParams['backend.qt4']='PySide'  from matplotlib.figure import Figure from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas   class MainWindow(QMainWindow):       def __init__(self, parent=None):          super(MainWindow, self).__init__(parent)          self.main_frame = QWidget()         self.figure = Figure()         self.canvas = FigureCanvas(self.figure)         self.canvas.setParent( self.main_frame )         self.axes = self.figure.add_subplot(111)         vbox = QVBoxLayout( )         vbox.addWidget( self.canvas )         self.main_frame.setLayout( vbox )         self.setCentralWidget( self.main_frame )         self.button = QPushButton('Run')      def button_pressed(self):         data1 = np.loadtxt('FStream.dat')         data2 = np.loadtxt('FShield.dat')         self.axes.plot(data1[0],data1[1],data2[0],data2[1])         print 'pressed'         self.canvas.draw()   if __name__ == '__main__':     app = QApplication(sys.argv)     frame = MainWindow()      frame.button.clicked.connect(frame.button_pressed)     frame.button.show()         frame.show()     app.exec_() 

Thanks a lot!

EDIT: edited the code to put the draw().

EDIT 2: Separating in different functions is now looking like this:

import sys import platform  import numpy as np import PySide from PySide.QtGui import QApplication, QMainWindow, QTextEdit,\                          QPushButton,  QMessageBox, QWidget, QVBoxLayout from PySide import QtCore    __version__ = '0.0.1'  from ui_pygradient_uni import Ui_MainWindow import matplotlib import widgets.matplotlibwidget  matplotlib.use('Qt4Agg') matplotlib.rcParams['backend.qt4']='PySide'  #from matplotlib.figure import Figure #from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas   class MainWindow(QMainWindow):       def __init__(self, parent=None):          super(MainWindow, self).__init__(parent)          self.main_frame = widgets.matplotlibwidget.MatplotlibWidget()          self.button = QPushButton('Run')          vbox = QVBoxLayout( )         vbox.addWidget( self.main_frame.canvas )         self.main_frame.setLayout( vbox )         self.setCentralWidget( self.main_frame )      def button_pressed(self):         data1 = np.loadtxt('FStream.dat')         data2 = np.loadtxt('FShield.dat')         self.axes.plot(data1[0],data1[1],data2[0],data2[1])         self.canvas.draw()         print 'pressed'   if __name__ == '__main__':     app = QApplication(sys.argv)     frame = MainWindow()      frame.button.clicked.connect(frame.main_frame.Plot)     frame.button.show()         frame.show()     app.exec_() 

And the matplotlibwidget is like this:

import matplotlib import numpy as np   matplotlib.use('Qt4Agg') matplotlib.rcParams['backend.qt4']='PySide'   from matplotlib.figure import Figure from matplotlib.backends.backend_qt4agg import FigureCanvasQTAgg as FigureCanvas    class MatplotlibWidget(FigureCanvas):      def __init__(self, parent=None):         super(MatplotlibWidget, self).__init__(Figure())          self.setParent(parent)         self.figure = Figure()         self.canvas = FigureCanvas(self.figure)         self.axes = self.figure.add_subplot(111)       def Plot(self):           data1 = np.loadtxt('FStream.dat')         data2 = np.loadtxt('FShield.dat')          self.axes.plot(data1[0],data1[1],data2[0],data2[1])         self.canvas.draw() 

回答1:

Try putting in

self.canvas.draw() 

after

self.axes.plot(data1[0],data1[1],data2[0],data2[1]) 

Your GUI code looks ok and button_pressed is being called correctly but the graph isn't being redrawn.

文章来源: connection of Pyside QPushButton and matplotlib