파이썬으로 포토샵 압력계를 만들고 싶은데 잘 안풀립니다..

import sys
from PyQt5.QtCore import *
from PyQt5.QtGui import *
from PyQt5.QtWidgets import *
 
 
class PressureBar(QWidget):
    def __init__(self, parent=None):
        super().__init__()
        self.pen_pressure = 0
        self.resize(100, 100)
        frame_rect = app.desktop().frameGeometry()
        self.progress = QProgressBar(self)
        self.progress.setGeometry(0, 0, 300, 25)
        self.progress.setMaximum(100)
 
    def tabletEvent(self, tabletEvent):
        self.pen_pressure = int(tabletEvent.pressure() * 100)
 
        if(tabletEvent.type() == QTabletEvent.TabletPress):
            self.penIsDown = True
 
        self.progress.setValue(self.pen_pressure)
        tabletEvent.accept()
        self.update()
 
app = QApplication(sys.argv)
myWindow = PressureBar()
myWindow.show()
app.exec()