跨类的变量以在 PyQt GUI 中缩放绘图

How can I get the apply button to send the 3 variables across to the main class and to the plotting class? Would it be possible to have all of this happen within one class to simplify how my variables will work?

import sys
import matplotlib
matplotlib.use("Qt5Agg")
from PyQt5 import QtCore
from PyQt5.QtCore import pyqtSlot, pyqtSignal, QObject
from PyQt5.QtWidgets import *
from numpy import arange, sin, pi
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure

class AppForm(QWidget):

    def __init__(self):
        # Initialize the object as a QWidget and
        # set its title and minimum width
        QWidget.__init__(self)
        self.setWindowTitle('Input')
        self.setMinimumWidth(400)

        # Create the QVBoxLayout that lays out the whole form
        self.layout = QVBoxLayout()

        # Create the form layout that manages the labeled controls
        self.form_layout = QFormLayout()

        self.aFactor = QLineEdit(self)
        self.mFactor = QLineEdit(self)
        self.cZone = QLineEdit(self)

        self.form_layout.addRow('AFactor', self.aFactor)
        self.form_layout.addRow('MFactor', self.mFactor)
        self.form_layout.addRow('CZone', self.cZone)

        self.layout.addLayout(self.form_layout)
        self.button_box = QHBoxLayout()
        self.button_box.addStretch(1)

        self.apply_button = QPushButton("Apply", self)
        self.output_button = QPushButton("Output", self)

        self.button_box.addWidget(self.apply_button)
        self.button_box.addWidget(self.output_button)
        self.layout.addLayout(self.button_box)
        self.setLayout(self.layout)

        self.apply_button.clicked.connect(self.applyButton)

    def applyButton(self):
        self.af = self.aFactor
        self.mf = self.mFactor
        self.cz = self.cZone

        print self.af.text(), self.mf.text(), self.cz.text()

class MyMplCanvas(FigureCanvas):
    """Ultimately, this is a QWidget (as well as a FigureCanvasAgg, etc.)."""
    def __init__(self, parent=None, width=5, height=4, dpi=100, title='title'):
        self.title = title
        fig = Figure(figsize=(width, height), dpi=dpi)
        self.axes = fig.add_subplot(111)
        fig.suptitle(title)

        # We want the axes cleared every time plot() is called
        self.axes.hold(False)

        self.compute_initial_figure()


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

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

    def compute_initial_figure(self):
        pass


class MyStaticMplCanvas(MyMplCanvas):
    """Simple canvas with a sine plot."""
    def compute_initial_figure(self):
        t = arange(0.0, 3.0, 0.01)
        s = sin(2*pi*t)
        self.axes.plot(t, s)
        self.axes.set_ylabel('label1')
        self.axes.set_xlabel('label')
        self.axes.grid(True)



class ApplicationWindow(QMainWindow):
    def __init__(self):
        QMainWindow.__init__(self)
        self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
        self.setWindowTitle("application main window")
        self.setMinimumWidth(800)
        self.setMinimumHeight(600)

        self.file_menu = QMenu('&File', self)
        self.file_menu.addAction('&Quit', self.fileQuit,
                QtCore.Qt.CTRL + QtCore.Qt.Key_Q)
        self.menuBar().addMenu(self.file_menu)

        self.help_menu = QMenu('&Help', self)
        self.menuBar().addSeparator()
        self.menuBar().addMenu(self.help_menu)

        self.help_menu.addAction('&About', self.about)

        self.main_widget = QWidget(self)

        l = QVBoxLayout(self.main_widget)
        form = AppForm()
        sc = MyStaticMplCanvas(self.main_widget, width=5, height=4, dpi=100, title='Title 1')
        l.addWidget(form)
        l.addWidget(sc)

        self.main_widget.setFocus()
        self.setCentralWidget(self.main_widget)

        #self.statusBar().showMessage("Cool", 2000

    def fileQuit(self):
        self.close()

    def closeEvent(self, ce):
        self.fileQuit()

    def about(self):
        QMessageBox.about(self, "About",)


if __name__ == '__main__':
    app = QApplication(sys.argv)

    aw = ApplicationWindow()
    aw.setWindowTitle("PyQt5 Matplot Example")
    aw.show()
    #sys.exit(qApp.exec_())
    app.exec_()

解决方案

这里有几个选项:

(a) 在主课中完成工作:不要将 AppForm 中的按钮连接到 AppForm 中的方法，而是在 ApplicationWindow 中执行相同操作.

self.form = AppForm()
self.sc = MyStaticMplCanvas(....)
self.form.apply_button.clicked.connect(self.applyButton)

def applyButton(self):
    tx = self.form.aFactor.text()
    # do something with tx
    # e.g. call a method from MplCanvas
    self.sc.someMethod(tx)

class AppForm(QWidget):
    mysignal = pyqtSignal(object)
    def __init__(self):
        ....
        self.apply_button.clicked.connect(self.applyButton)

    def applyButton(self):
        self.mysignalemit((self.aFactor.text(),self.mFactor.text(), self.cZone()) )

class ApplicationWindow(QMainWindow):
    def __init__(self):
        ....
        self.form = AppForm()
        self.sc = MyStaticMplCanvas(....)
        self.form.mysignal.connect(self.useButtonResults)
        self.form.mysignal.connect(self.sc.someMethod)

    def useButtonResults(self, obj):
        a,b,c = obj
        # do something with a, b, c