PyQt5使用pyqtgraph绘图时UI卡顿的解决
Posted first_code
tags:
篇首语：本文由小常识网(cha138.com)小编为大家整理，主要介绍了PyQt5使用pyqtgraph绘图时UI卡顿的解决相关的知识，希望对你有一定的参考价值。
思路是把所有数据处理计算的过程放在主线程之外的子线程内
问题，如果不对数据进行剪裁，长时间过后主线程内的绘图会消耗比较多的时间
from PyQt5.QtWidgets import * from PyQt5.QtCore import * from PyQt5.QtGui import * from PyQt5 import QtWidgets,QtGui,QtCore import pyqtgraph as pg import sys,os,random,time,psutil class UI_MainWindow(QMainWindow): def __init__(self): super(UI_MainWindow, self).__init__() self.setWindowTitle(‘CPUinfo‘) self.setWindowIcon(QIcon(‘./CPU.png‘)) self.resize(600,480) self.main_widget = QWidget() self.main_layout = QGridLayout() self.main_widget.setLayout(self.main_layout) self.setCentralWidget(self.main_widget) self.plot_widget = QWidget() self.plot_layout = QGridLayout() self.plot_widget.setLayout(self.plot_layout) self.plot_plt = pg.PlotWidget() self.plot_plt.setYRange(max=100,min=0) self.plot_layout.addWidget(self.plot_plt) self.plot_plt.setYRange(max=100,min=0) self.main_layout.addWidget(self.plot_widget) self.setCentralWidget(self.main_widget) class NewThread(QThread): trigger = pyqtSignal(list) def __init__(self): super(NewThread, self).__init__() self.dataList = [] def run(self): print(‘NewThread start!‘) timelist = [] while True: time.sleep(1) # Xtime = time.strftime("%H%M%S") Ycpu = "%0.2f" % psutil.cpu_percent(interval=1) self.dataList.append(float(Ycpu)) # timelist.append(float(Xtime)) # print(Xtime, Ycpu) self.trigger.emit(self.dataList) class showMainWindow(UI_MainWindow): def __init__(self): super(showMainWindow, self).__init__() self.Thread1 = NewThread() self.Thread1.trigger.connect(self.Plot) self.Thread1.start() def Plot(self,list1): self.plot_plt.plot().setData(list1) if __name__ == ‘__main__‘: app = QApplication(sys.argv) gui = showMainWindow() gui.show() sys.exit(app.exec_())
更新：解决一次时间长了之后一次绘制太多点导致卡顿问题
from PyQt5.QtWidgets import * from PyQt5.QtCore import * from PyQt5.QtGui import * from PyQt5 import QtWidgets,QtGui,QtCore import pyqtgraph as pg import sys,os,random,time,psutil # from UI import UI_MainWindow class UI_MainWindow(QMainWindow): def __init__(self): super(UI_MainWindow, self).__init__() self.setWindowTitle(‘CPUinfo‘) self.setWindowIcon(QIcon(‘./CPU.png‘)) self.resize(600,480) self.main_widget = QWidget() self.main_layout = QGridLayout() self.main_widget.setLayout(self.main_layout) self.setCentralWidget(self.main_widget) self.plot_widget = QWidget() self.plot_layout = QGridLayout() self.plot_widget.setLayout(self.plot_layout) self.plot_plt = pg.PlotWidget() self.plot_plt.setYRange(max=100,min=0) self.plot_layout.addWidget(self.plot_plt) self.plot_plt.setYRange(max=100,min=0) self.main_layout.addWidget(self.plot_widget) self.setCentralWidget(self.main_widget) class NewThread(QThread): trigger = pyqtSignal(list,list) def __init__(self): super(NewThread, self).__init__() self.dataList = [] self.timeList = [] self.a = 0 def run(self): print(‘NewThread start!‘) while True: # time.sleep(1) # Xtime = time.strftime("%H%M%S") Ycpu = "%0.2f" % psutil.cpu_percent(interval=1) self.dataList.append(float(Ycpu)) self.timeList.append(self.a) # timelist.append(float(Xtime)) # print(Xtime, Ycpu) self.a += 1 self.trigger.emit(self.dataList,self.timeList) class showMainWindow(UI_MainWindow): def __init__(self): super(showMainWindow, self).__init__() self.Thread1 = NewThread() self.Thread1.trigger.connect(self.Plot) self.Thread1.start() def Plot(self,list,list1): self.plot_plt.plot().setData(list1[len(list1)-2:],list[len(list)-2:],pen=‘g‘,symbol=‘o‘) if __name__ == ‘__main__‘: app = QApplication(sys.argv) gui = showMainWindow() gui.show() sys.exit(app.exec_())
以上是关于PyQt5使用pyqtgraph绘图时UI卡顿的解决的主要内容，如果未能解决你的问题，请参考以下文章