import pygame

class Knob:
    
    def __init__(self, screen):
        self.screen = screen
        self.radius = screen.get_width()/20
        self.fill_color = (255,0,255)
        self.position = (screen.get_width()/2, screen.get_height()/2)

    def display(self):
        pygame.draw.circle(self.screen, self.fill_color , self.position, self.radius)