我在嘗試理解視窗物件的作業方式時遇到了麻煩。我通過 matplotlib 在輔助視窗上有一個實時繪圖。該圖每秒更新一次新的計算值。我期望的是每當我關閉第二個視窗時停止運行并在我重新打開它時重新啟動的方法。當我關閉第二個視窗時，我可以重置陣列值，但如上所述，計算值的這種方法仍在運行。
這是我的代碼（最初使用傳感器，我對其進行了修改以生成亂數）：
from PyQt5 import QtCore
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QVBoxLayout
import sys
import random
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
# The main window
class Window(QWidget):
def __init__(self):
super().__init__()
self.setGeometry(200,200, 400,300)
self.setWindowTitle('Test')
self.demo = None
self.create_buttons()
def create_buttons(self):
btn1 = QPushButton('Open window', self)
btn1.setGeometry(100,100, 100,100)
btn1.clicked.connect(self.open_w)
def open_w(self):
if self.demo is None:
self.demo = AppDemo()
self.demo.show()
# Second window, where I plot the data
class AppDemo(QWidget):
def __init__(self):
super().__init__()
self.resize(650, 500)
self.plotwidget = QWidget(self)
self.chart = Matplotlibwidget()
self.chart.plot_widget(self.plotwidget, self.chart)
def closeEvent(self, event):
event.accept()
func.start_lists()
print('Window closed')
# My widget for my graph
class Matplotlibwidget(FigureCanvas):
def __init__(self, parent=None):
fig = Figure()
self.axes = fig.add_subplot(111)
FigureCanvas.__init__(self, fig)
self.setParent(parent)
FigureCanvas.updateGeometry(self)
def plot_widget(self, canvasWidget, graph):
self.layoutvertical = QVBoxLayout(canvasWidget)
self.layoutvertical.addWidget(graph)
timer = QtCore.QTimer(self)
timer.timeout.connect(self.plotting)
timer.start(1000)
def plotting(self):
self.y = func.calculate()
func.appends(self.y)
self.axes.cla()
self.axes.plot(func.x, func.y)
self.draw()
# This is a generic class I use to calculate the data, originally this is a class for my sensor
class FuncTime ():
def __init__(self):
self.start_lists()
def start_lists(self):
self.x, self.y = [0], [1]
def calculate(self):
return self.y[-1] self.y[-1] * random.uniform(-0.1, 0.1)
def appends(self, y):
print(self.x[-1], ', ', self.y[-1])
self.x.append(self.x[-1] 1)
self.y.append(y)
app = QApplication(sys.argv)
func = FuncTime()
window = Window()
window.show()
sys.exit(app.exec_())
uj5u.com熱心網友回復：
視窗關閉并不意味著計時器停止，您必須使用 QTimer 的 stop 方法來實作它。
from functools import cached_property
import random
import sys
from PyQt5.QtCore import QTimer
from PyQt5.QtWidgets import QApplication, QWidget, QPushButton, QVBoxLayout
from matplotlib.backends.backend_qt5agg import FigureCanvasQTAgg as FigureCanvas
from matplotlib.figure import Figure
class Window(QWidget):
def __init__(self):
super().__init__()
self.setGeometry(200, 200, 400, 300)
self.setWindowTitle("Test")
self.create_buttons()
@cached_property
def demo(self):
return AppDemo()
def create_buttons(self):
btn1 = QPushButton("Open window", self)
btn1.setGeometry(100, 100, 100, 100)
btn1.clicked.connect(self.open_w)
def open_w(self):
self.demo.chart.start()
self.demo.show()
class AppDemo(QWidget):
def __init__(self):
super().__init__()
self.resize(650, 500)
self.chart = Matplotlibwidget()
lay = QVBoxLayout(self)
lay.addWidget(self.chart)
def closeEvent(self, event):
super().closeEvent(event)
self.chart.stop()
class Matplotlibwidget(FigureCanvas):
def __init__(self, parent=None):
fig = Figure()
self.axes = fig.add_subplot(111)
FigureCanvas.__init__(self, fig)
self.setParent(parent)
self.updateGeometry()
@cached_property
def timer(self):
return QTimer(interval=1000, timeout=self.handle_timeout)
@cached_property
def func_time(self):
return FuncTime()
def start(self):
self.timer.start()
def stop(self):
self.timer.stop()
self.func_time.reset()
def handle_timeout(self):
self.plotting()
def plotting(self):
self.y = self.func_time.calculate()
self.func_time.appends(self.y)
self.axes.cla()
self.axes.plot(self.func_time.x, self.func_time.y)
self.draw()
class FuncTime:
def __init__(self):
self.reset()
def reset(self):
self.x, self.y = [0], [1]
def calculate(self):
return self.y[-1] self.y[-1] * random.uniform(-0.1, 0.1)
def appends(self, y):
print(self.x[-1], ", ", self.y[-1])
self.x.append(self.x[-1] 1)
self.y.append(y)
app = QApplication(sys.argv)
window = Window()
window.show()
sys.exit(app.exec_())
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