重新启动实时绘图时，pyqtgraph实时绘图中断

Posted 2023-03-25

【中文标题】重新启动实时绘图时，pyqtgraph实时绘图中断

【英文标题】：pyqtgraph realtime plot broke when re-start the realtime plot

【发布时间】：2019-02-13 09:20:33

【问题描述】：

所以，在这个程序中，我可以通过更改切片器值来启动 Qthread 实时绘图，当我将滑块值设置为零时，QThread 实时绘图会停止绘图。 但有时当我尝试再次重新启动实时绘图时，情节看起来像这张图片一样在短时间内被破坏了。

在这张图片中，实际折线图下方有一个单线斜线

这是我的代码：

ui.py

    from pyqtgraph.Qt import QtCore, QtGui
from PyQt4 import QtCore,QtGui,uic
import sys
import time
from collections import deque
from DynamicThread import DynamicThread
from ThreadRun import ThreadRun

from GUI_ui import Ui_home

class ui(QtGui.QTabWidget):
    akselerasi = 0
    curve = None
    dataGraph = deque(maxlen=20)
    x1 = []
    y1 = []
    aa = False

    def __init__(self,parent = None):
        super(ui,self).__init__(parent = parent)

        self.UiMeja = Ui_home()
        self.UiMeja.setupUi(self)

        self.UiMeja.akselerasi.setMinimum(0)
        self.UiMeja.akselerasi.setMaximum(50)
        self.UiMeja.akselerasi.setValue(0)
        self.UiMeja.akselerasi.valueChanged.connect(self.valueAkselerasi)
        self.UiMeja.akselerasi.sliderReleased.connect(self.getThread)

        self.threadDinamis = DynamicThread()
        self.threadDinamis.dataThread.connect(self.runningDynamic)
        ui.curve = self.UiMejaGetar.graph1.plot(pen=(255,0,0))
        self.UiMeja.graph1.setRange(xRange=None, yRange=[-1, 1 ])
        self.UiMeja.graph1.showGrid(x=True, y=True)
        self.UiMeja.graph1.setMouseEnabled(x=False, y=False)
        self.UiMejaGetar.l1.setText(str(self.UiMejaGetar.akselerasi.value()))

    def getThread(self):

        if self.sender() == self.UiMeja.akselerasi:
            ui.akselerasii = int(self.UiMeja.akselerasi.value())

        if GUI_MejaGetar.akselerasii > 0:
            if ui.aa == True:
                print("second")
                minRange = int(self.UiMeja.akselerasi.value()) * -1
                self.UiMeja.graph1.setRange(xRange=None, yRange=[minRange, int(self.UiMeja.akselerasi.value()) ])
                self.threadDinamis.trigrer(ui.akselerasii)

            else:
                minRange = int(self.UiMeja.akselerasi.value()) * -1
                self.UiMeja.graph1.setRange(xRange=None, yRange=[minRange, int(self.UiMeja.akselerasi.value()) ])
                GUI_MejaGetar.aa = True

                print("first")
                self.threadDinamis.trigrer(GUI_MejaGetar.akselerasii)
                self.threadDinamis.start()
        else:
            self.threadDinamis.stop()
            GUI_MejaGetar.aa = False
            GUI_MejaGetar.dataGraph.clear()
            GUI_MejaGetar.x1 = []
            GUI_MejaGetar.y1 = []

    def runningDynamic(self,generateData):
        #print(generateData['x'])
        GUI_MejaGetar.dataGraph.append('x': generateData['x'], 'y': generateData['y'])
        GUI_MejaGetar.x1 = [item['x'] for item in GUI_MejaGetar.dataGraph]
        GUI_MejaGetar.y1 = [item['y'] for item in GUI_MejaGetar.dataGraph]
        GUI_MejaGetar.curve.setData(x=GUI_MejaGetar.x1, y=GUI_MejaGetar.y1)


if __name__ == '__main__':

    app = QtGui.QApplication([])
    widget = GUI_MejaGetar()

    widget.show()
    app.exec_()

这是我的线程代码：

动态线程.py

    import time
import sys
from PyQt4 import QtGui, QtCore
from PyQt4.QtCore import QTime, QTimer
from randomMethod import randomMethod

class DynamicThread(QtCore.QThread):
    dataThread = QtCore.pyqtSignal(object)
    dynamicGenerator = randomMethod()
    status = False
    intAkselerasi = 0
    def __init__(self, parent=None):
        QtCore.QThread.__init__(self,parent)
        #self.gui_text = None

    def trigrer(self,num):
        DynamicThread.intAkselerasi = num

    def do_work(self):
        i = 0
        listData = []
        count = 0
        test = 0
        #t = QTime()
        #t.start()
        print("starting.....")

        while DynamicThread.status == True:
            if DynamicThread.intAkselerasi > 0:
                if not listData:
                    value = int(DynamicThread.dynamicGenerator.bits(), 2)
                    dat = value % DynamicThread.intAkselerasi
                    listData.append(dat)
                    count = dat
                else:
                    value = int(DynamicThread.dynamicGenerator.bits(), 2)
                    dat = value % DynamicThread.intAkselerasi

                    if listData[i - 1] < 0:
                        dat = dat * -1
                    test = 0
                    test = count + dat
                    lowLimit = DynamicThread.intAkselerasi * -1
                    if DynamicThread.intAkselerasi > test > lowLimit:
                        count = count + dat
                        listData.append(count)
                    else:
                        if dat < lowLimit:
                            temp = abs(dat)
                            count = count + temp
                            listData.append(temp)
                        else:
                            temp = dat * -1
                            count = count + temp
                            listData.append(temp)
                print(listData[i])
                print("test: ",test)
                print("count: ",count)
                self.dataThread.emit('x': i,'y':count)
                i = i + 1
                time.sleep(0.1)
            else:
                DynamicThread.status = False
                print("stop")
                break
        print("stoping the process....")

    def run(self):
        self.do_work()

    def start(self):
        DynamicThread.status = True
        super(DynamicThread, self).start()

    def stop(self):
        DynamicThread.status = False

那么，我的代码有什么问题？知道如何解决吗？谢谢 （注：我在树莓派 3 上运行此代码）

【参考方案1】：

为了解决这个问题，我添加了

GUI_MejaGetar.dataGraph.clear()
GUI_MejaGetar.x1 = []
GUI_MejaGetar.y1 = []

每次我开始第一次或结束实时循环时