问题描述
当我尝试通过QThread进行自我更新QLineSeries时遇到问题。
from PySide2.QtCore import *
from PySide2 import *
from PySide2.QtWidgets import *
from PySide2.QtCharts import *
from PySide2.QtGui import *
import time
baseValuesList = [0,0]
randomValuesList = [256,14,89,100,150,500,50,34,67,90,102,12,19,145,71,4,47]
rangeList = list(range(len(baseValuesList)))
def listUpdatingFunction():
baseValuesList.pop(0)
baseValuesList.append(randomValuesList[0])
randomValuesList.pop(0)
class Worker(QObject):
def __init__(self,function,interval):
super(Worker,self).__init__()
self._step = 0
self._isRunning = True
self.function = function
self.interval = interval
def task(self):
if not self._isRunning:
self._isRunning = True
self._step = 0
while self._isRunning == True:
self.function()
time.sleep(self.interval)
def stop(self):
self._isRunning = False
class minimalMonitor(QtWidgets.QWidget):
def __init__(self):
QtWidgets.QWidget.__init__(self)
# Creating QChart
self.layout = QVBoxLayout()
self.setLayout(self.layout)
self.chart = QtCharts.QChart()
self.chart.setAnimationOptions(QtCharts.QChart.AllAnimations)
self.series = QtCharts.QLineSeries()
for i in rangeList:
self.series.append(i,baseValuesList[i])
self.chart.addSeries(self.series)
self.chart_view = QtCharts.QChartView(self.chart)
self.chart_view.setRenderHint(QPainter.Antialiasing)
self.layout.addWidget(self.chart_view)
self.axis_x = QtCharts.QValueAxis()
self.chart.addAxis(self.axis_x,Qt.AlignBottom)
self.axis_y = QtCharts.QValueAxis()
self.chart.addAxis(self.axis_y,Qt.AlignLeft)
self.axis_x.setRange(0,20)
self.axis_y.setRange(0,300)
self.series.attachAxis(self.axis_x)
self.series.attachAxis(self.axis_y)
self.thread = QThread()
self.thread.start()
self.worker = Worker(self.update,1)
self.worker.moveToThread(self.thread)
self.autoUpdateStart = QPushButton("Start Auto-Update")
self.autoUpdateStart.setCheckable(False)
self.autoUpdateStart.toggle()
self.autoUpdateStart.clicked.connect(self.worker.task)
self.autoUpdateStop = QPushButton("Stop Auto-Update")
self.autoUpdateStop.setCheckable(False)
self.autoUpdateStop.toggle()
self.autoUpdateStop.clicked.connect(lambda: self.worker.stop())
self.layout.addWidget(self.autoUpdateStart)
self.layout.addWidget(self.autoUpdateStop)
self.manualUpdateButton = QPushButton("Manual Update")
self.manualUpdateButton.setCheckable(False)
self.manualUpdateButton.toggle()
self.manualUpdateButton.clicked.connect(self.update)
self.layout.addWidget(self.manualUpdateButton)
def update(self):
listUpdatingFunction()
self.series.clear()
for i in rangeList:
self.series.append(i,baseValuesList[i])
self.chart_view.update()
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
widget = minimalMonitor()
widget.show()
sys.exit(app.exec_())
简而言之,如果我直接调用更新函数或按手动更新,则QLineSeries将正确追加,但是一旦我使用QThread或“自动更新”按钮,它就会变成麻烦,并且将始终尝试与Axis Origin联接。 。
有谁知道为什么要这么做吗?解决方法
在这种情况下,我看到以下错误:
- 由于QTImer就足够了,因此不必使用线程来执行重复的任务,例如,对于QThread,您不能并且不应该像现在那样从辅助线程更新GUI,这与QTimer允许的不同。 / li>
- 我不明白为什么要从randomValuesList中删除元素,因为在某一时刻该列表将为空,从而导致问题。
import random
from PySide2 import QtCore,QtGui,QtWidgets
from PySide2.QtCharts import QtCharts
baseValuesList = [0,0]
randomValuesList = [256,14,89,100,150,500,50,34,67,90,102,12,19,145,71,4,47]
def listUpdatingFunction():
baseValuesList.pop(0)
value = random.choice(randomValuesList)
baseValuesList.append(value)
class Worker(QtCore.QObject):
def __init__(self,function,interval):
super(Worker,self).__init__()
self._funcion = function
self._timer = QtCore.QTimer(self,interval=interval,timeout=self.execute)
@property
def running(self):
return self._timer.isActive()
def start(self):
self._timer.start()
def stop(self):
self._timer.stop()
def execute(self):
self._funcion()
class minimalMonitor(QtWidgets.QWidget):
def __init__(self):
QtWidgets.QWidget.__init__(self)
# Creating QChart
layout = QtWidgets.QVBoxLayout(self)
self.chart = QtCharts.QChart()
self.chart.setAnimationOptions(QtCharts.QChart.AllAnimations)
self.series = QtCharts.QLineSeries()
self.chart.addSeries(self.series)
self.chart_view = QtCharts.QChartView(self.chart)
self.chart_view.setRenderHint(QtGui.QPainter.Antialiasing)
layout.addWidget(self.chart_view)
self.axis_x = QtCharts.QValueAxis()
self.chart.addAxis(self.axis_x,QtCore.Qt.AlignBottom)
self.axis_y = QtCharts.QValueAxis()
self.chart.addAxis(self.axis_y,QtCore.Qt.AlignLeft)
self.axis_x.setRange(0,20)
self.axis_y.setRange(0,300)
self.series.attachAxis(self.axis_x)
self.series.attachAxis(self.axis_y)
self.worker = Worker(self.update_chart,1000)
self.autoUpdateStart = QtWidgets.QPushButton("Start Auto-Update")
self.autoUpdateStart.setCheckable(False)
self.autoUpdateStart.toggle()
self.autoUpdateStart.clicked.connect(self.worker.start)
self.autoUpdateStop = QtWidgets.QPushButton("Stop Auto-Update")
self.autoUpdateStop.setCheckable(False)
self.autoUpdateStop.toggle()
self.autoUpdateStop.clicked.connect(self.worker.stop)
layout.addWidget(self.autoUpdateStart)
layout.addWidget(self.autoUpdateStop)
self.manualUpdateButton = QtWidgets.QPushButton("Manual Update")
self.manualUpdateButton.setCheckable(False)
self.manualUpdateButton.toggle()
self.manualUpdateButton.clicked.connect(self.update_chart)
layout.addWidget(self.manualUpdateButton)
self.update_chart()
def update_chart(self):
listUpdatingFunction()
self.series.clear()
for i,value in enumerate(baseValuesList):
self.series.append(i,value)
self.chart_view.update()
if __name__ == "__main__":
import sys
app = QtWidgets.QApplication(sys.argv)
widget = minimalMonitor()
widget.show()
sys.exit(app.exec_())