Python 从pygame中的opencv生成的椭圆中删除边框

我已经设置了这个窗口，在这个窗口中，我在屏幕上画一个椭圆.我希望椭圆形是全白的，边框光滑.它看起来可以接受，但当我将椭圆添加到白色背景时，椭圆的边框就会显示出来.

import pygame
import cv2
import numpy as np

pygame.init()

# Set up the Pygame window
screen_width = 640
screen_height = 480
screen = pygame.display.set_mode((screen_width, screen_height))

def drawAACircle(surf, color, center, radius, width, angle):
    circle_image = np.zeros((radius*2, radius*2, 4), dtype = np.uint8)
    circle_image = cv2.ellipse(circle_image, (radius, radius), (radius-width, radius-width), (angle*-.5)-90 , 0, angle, (*color, 255), width, lineType=cv2.LINE_AA)  
    #draw it on the surface
    surf.blit(pygame.image.frombuffer(circle_image.tobytes(), circle_image.shape[1::-1], "RGBA").convert_alpha(), (center[0]-radius, center[1]-radius))

# Wait for the user to close the window
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            quit()
    
    screen.fill((255,255,255))

    drawAACircle(screen, (255,255,255), (screen_width/2,screen_height/2), 200, 20, 360)

    # Update the display
    pygame.display.flip()

当我将背景更改为全白时，我注意到了边框:

我目前正在开发一个贴花工具，可以将多个椭圆堆叠在一起.我用copy()刷新背景屏幕，如下所示:

def takeSnapshot():
    global snapshot
    snapshot = screen.copy()

def clearSnapshot():
    global snapshot
    snapshot = None

----
# Run the main loop
running = True
while running:
    events = pygame.event.get()
    for event in events:
        if event.type == pygame.QUIT:
            running = False      

    
    # Clear the screen
    if snapshot is None:
        screen.fill((0,0,0))
         
    else:
        screen.blit(snapshot, (0,0))

我已经使用填充的多边形try 了gfx.aapolygon ICM.但我就是不能把它弄得像OpenCV椭圆一样干净利落.

如果有人知道另一种 Select ，我会很高兴听到的，或者我可能忽略了一些我可以只得到完全白色的OpenCV椭圆的地方.

编辑:为了清楚起见，我 Select 了OpenCV椭圆作为厚度选项，可以做出一个弧形，看起来很流畅.