def initUI(self): # Instantiate classes self.ui = Ui_MainWindow() self.ui.setupUi(self) self.ui.img.mousePressEvent = self.pixelSelect # Register actions (buttons) self.ui.dirSearch.clicked.connect(self.browseDir) self.ui.nxtImg.clicked.connect(self.advanceImg) self.ui.skip.clicked.connect(self.skip) # Data members self.pointsToDraw = [] self.img = None self.allImages = None self.ix = None self.numPoints = 0 self.pointsLeft = NP