python - 如何将参数从 PyQt5 QSpinBox 传输到 Matplotlib?
问题描述
原代码来自: https ://github.com/boxcontrol/matplotlibPyQt5/blob/master/matplotlibPyQt5.py
我对代码做了一些修改,现在的代码如下。
import sys
import random
import matplotlib
matplotlib.use("Qt5Agg")
from PyQt5 import QtCore
from PyQt5.QtWidgets import QApplication, QMainWindow, QMenu, QVBoxLayout, QSizePolicy, QMessageBox, QWidget, QSpinBox
from numpy import arange, sin, pi
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
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):
fig = Figure(figsize=(width, height), dpi=dpi)
self.axes = fig.add_subplot(111)
# 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) # by clicking the QSpinBox, this line should be like s = sin(value_from_QSpinBox * pi * t)
self.axes.plot(t, s)
class ApplicationWindow(QMainWindow):
def __init__(self):
QMainWindow.__init__(self)
self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
self.setWindowTitle("application main window")
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.main_widget = QWidget(self)
self.sb = QSpinBox(self)
self.sb.setMinimum(1)
self.sb.setMaximum(10)
self.sb.setSingleStep(1)
self.sb.setValue(1)
self.sb.resize(self.sb.sizeHint())
l = QVBoxLayout(self.main_widget)
sc = MyStaticMplCanvas(self.main_widget, width=5, height=4, dpi=100)
l.addWidget(self.sb)
l.addWidget(sc)
self.main_widget.setFocus()
self.setCentralWidget(self.main_widget)
self.statusBar().showMessage("All hail matplotlib!", 2000)
def fileQuit(self):
self.close()
def closeEvent(self, ce):
self.fileQuit()
if __name__ == '__main__':
app = QApplication(sys.argv)
aw = ApplicationWindow()
aw.setWindowTitle("PyQt5 Matplot Example")
aw.show()
app.exec_()
窗口中有一个 QSpinBox 和一个 matplotlib 图。通过更改 QSpinBox 的值,我想更改 matplotlib-diagram。
确切地说,以下行应该从 QSpinBox 中获取参数,并且应该相应地更新 sin-diagram。
s = sin(2*pi*t) # by clicking the QSpinBox, this line should be like s = sin(value_from_QSpinBox * pi * t)
我自己尝试了很多,但都失败了。有人可以帮我吗?非常感谢!
解决方案
您必须使用 的valueChanged
信号QSpinBox
,为此您必须按照我向您展示的那样修改绘图执行的功能:
import sys
import matplotlib
matplotlib.use("Qt5Agg")
from PyQt5 import QtCore, QtWidgets
import numpy as np
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
class MyMplCanvas(FigureCanvas):
def __init__(self, parent=None, width=5, height=4, dpi=100):
fig = Figure(figsize=(width, height), dpi=dpi)
self.axes = fig.add_subplot(111)
FigureCanvas.__init__(self, fig)
self.setParent(parent)
self.axes.plot()
FigureCanvas.setSizePolicy(self,
QtWidgets.QSizePolicy.Expanding,
QtWidgets.QSizePolicy.Expanding)
FigureCanvas.updateGeometry(self)
class MyStaticMplCanvas(MyMplCanvas):
"""Simple canvas with a sine plot."""
def update_figure(self, f):
self.axes.cla()
t = np.arange(0.0, 3.0, 0.01)
s = np.sin(f*np.pi*t)
self.axes.plot(t, s)
self.draw()
class ApplicationWindow(QtWidgets.QMainWindow):
def __init__(self):
QtWidgets.QMainWindow.__init__(self)
self.setAttribute(QtCore.Qt.WA_DeleteOnClose)
self.setWindowTitle("application main window")
self.file_menu = QtWidgets.QMenu('&File', self)
self.file_menu.addAction('&Quit', self.close,QtCore.Qt.CTRL + QtCore.Qt.Key_Q)
self.menuBar().addMenu(self.file_menu)
self.main_widget = QtWidgets.QWidget()
l = QtWidgets.QVBoxLayout(self.main_widget)
self.sb = QtWidgets.QSpinBox(minimum=1, maximum=10, singleStep=1, value=1)
sc = MyStaticMplCanvas(self.main_widget, width=5, height=4, dpi=100)
self.sb.valueChanged.connect(sc.update_figure)
sc.update_figure(self.sb.value())
l.addWidget(self.sb)
l.addWidget(sc)
self.main_widget.setFocus()
self.setCentralWidget(self.main_widget)
self.statusBar().showMessage("All hail matplotlib!", 2000)
if __name__ == '__main__':
app = QtWidgets.QApplication(sys.argv)
aw = ApplicationWindow()
aw.setWindowTitle("PyQt5 Matplot Example")
aw.show()
sys.exit(app.exec_())
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