PyQt paintEvent

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'untitled.ui'
#
# Created by: PyQt5 UI code generator 5.15.9
#
# WARNING: Any manual changes made to this file will be lost when pyuic5 is
# run again.  Do not edit this file unless you know what you are doing.


from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtGui import QPainter
import serial
import time

import serial.tools.list_ports

#ser = serial.Serial("/dev/ttyACM0", 115200)

class Ui_MainWindow(object):
    def setupUi(self, MainWindow):
        MainWindow.setObjectName("MainWindow")
        MainWindow.setEnabled(True)
        MainWindow.resize(1023, 768)
        self.centralwidget = QtWidgets.QWidget(MainWindow)
        self.centralwidget.setObjectName("centralwidget")

        self.is_drawing = False

        self.detectGun = QtWidgets.QPushButton(self.centralwidget)
        self.detectGun.setGeometry(QtCore.QRect(5, 5, 130, 25))
        self.detectGun.setObjectName("detectGun")

        self.detectGun.clicked.connect(self.list_guns)

        self.listGun = QtWidgets.QComboBox(self.centralwidget)
        self.listGun.setGeometry(QtCore.QRect(5, 35, 130, 25))
        self.listGun.setObjectName("listGun")

        self.testRum = QtWidgets.QPushButton(self.centralwidget)
        self.testRum.setGeometry(QtCore.QRect(5, 65, 130, 25))
        self.testRum.setObjectName("testRum")

        self.testRum.clicked.connect(self.test_rum)

        self.testSol = QtWidgets.QPushButton(self.centralwidget)
        self.testSol.setGeometry(QtCore.QRect(5, 95, 130, 25))
        self.testSol.setObjectName("testSol")

        self.testSol.clicked.connect(self.test_sol)

        self.testCam = QtWidgets.QPushButton(self.centralwidget)
        self.testCam.setGeometry(QtCore.QRect(5, 125, 130, 25))
        self.testCam.setObjectName("testCam")

        self.testCam.clicked.connect(self.test_cam)

        MainWindow.setCentralWidget(self.centralwidget)
        self.statusbar = QtWidgets.QStatusBar(MainWindow)
        self.statusbar.setObjectName("statusbar")
        MainWindow.setStatusBar(self.statusbar)

        self.retranslateUi(MainWindow)
        QtCore.QMetaObject.connectSlotsByName(MainWindow)

    def retranslateUi(self, MainWindow):
        _translate = QtCore.QCoreApplication.translate
        MainWindow.setWindowTitle(_translate("MainWindow", "openFIR testing GUI"))
        self.detectGun.setText(_translate("MainWindow", "detect guns"))
        self.testRum.setText(_translate("MainWindow", "test rumble"))
        self.testSol.setText(_translate("MainWindow", "test solenoid"))
        self.testCam.setText(_translate("MainWindow", "test camera"))

    def list_guns(self, MainWindow):
        print("List serial connections: ")
        ports = serial.tools.list_ports.comports()
        self.listGun.clear()
        for p in ports:
            print(p.device)
            self.listGun.addItem(p.device)
        print(self.listGun.currentText())

    def test_rum(self, MainWindow):
        print("testing rumble")
        ser = serial.Serial(self.listGun.currentText(), 115200)
        rumStr = "rum"

        if ser.isOpen():
            ser.write(rumStr.encode('ascii'))


    def test_sol(self, MainWindow):
        print("testing solenoid")
        ser = serial.Serial(self.listGun.currentText(), 115200)
        solStr = "sol"

        if ser.isOpen():
            ser.write(solStr.encode('ascii'))

    def test_cam(self, MainWindow):

        ser = serial.Serial(self.listGun.currentText(), 115200)
        camStr = "cam"
        i = 0

        if ser.isOpen():

            while (i < 25):
                ser.write(camStr.encode('ascii')) #send the string 'cam' to arduino to get it to send back 12 position points
                line = ser.readline().decode('utf-8').rstrip() #receive bytes to end of line from arduino, strip out formatting data
                my_list = line.split(",") #split byte data based on comma, and put into list
                res = [eval(i) for i in my_list] #turn bytes into int
                #print(my_list)
                test_list = [300,300,500,300,300,600,500,600,500,300,300,500] #test list of 12 coordinates
                print(test_list)
                #print(test_list[5])

                #draw 6 circles

                #drawEllipse(test_list[0],test_list[1],35,35)
                #drawEllipse(test_list[2],test_list[3],35,35)
                #drawEllipse(test_list[4],test_list[5],35,35)
                #drawEllipse(test_list[6],test_list[7],35,35)
                #drawEllipse(test_list[8],test_list[9],35,35)
                #drawEllipse(test_list[10],test_list[11],35,35)

                #drawLine(test_list[0],test_list[1],test_list[2],test_list[3]) #connect 1 to 2
                #drawLine(test_list[0],test_list[1],test_list[4],test_list[5]) #connect 1 to 3
                #drawLine(test_list[4],test_list[5],test_list[6],test_list[7]) #connect 3 to 4
                #drawLine(test_list[2],test_list[3],test_list[6],test_list[7]) #connect 2 to 4

                time.sleep(0.2)
                i = i + 1

        print("camera test done")

if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    MainWindow = QtWidgets.QMainWindow()
    ui = Ui_MainWindow()
    ui.setupUi(MainWindow)
    MainWindow.show()
    sys.exit(app.exec_())