def update_bbox(self, touch):
        '''Update gesture bbox from a touch coordinate'''
        x, y = touch.x, touch.y
        bb = self.bbox
        if x < bb['minx']:
            bb['minx'] = x
        if y < bb['miny']:
            bb['miny'] = y
        if x > bb['maxx']:
            bb['maxx'] = x
        if y > bb['maxy']:
            bb['maxy'] = y
        self.width = bb['minx'] - bb['maxx']
        self.height = bb['maxy'] - bb['miny']
        self._update_time = Clock.get_time()
dataset/ETHPy150Open kivy/kivy/kivy/uix/gesturesurface.py/GestureContainer.update_bbox/swapped operands of `-`