中点bresenham算法画圆的python代码

以下是使用中点Bresenham算法在Python中绘制圆的代码示例：

import pygame
import math

def draw_circle(screen, x0, y0, radius):
    x = 0
    y = radius
    d = 1 - radius
    
    draw_points(screen, x0, y0, x, y)

    while(y > x):
        if(d < 0):
            d = d + 2 * x + 3
        else:
            d = d + 2 * (x - y) + 5
            y = y - 1
          
        x = x + 1
        draw_points(screen, x0, y0, x, y)

def draw_points(screen, x0, y0, x, y):
    pygame.draw.circle(screen, (255, 255, 255), (x0 + x, y0 + y), 2)
    pygame.draw.circle(screen, (255, 255, 255), (x0 - x, y0 + y), 2)
    pygame.draw.circle(screen, (255, 255, 255), (x0 + x, y0 - y), 2)
    pygame.draw.circle(screen, (255, 255, 255), (x0 - x, y0 - y), 2)
    pygame.draw.circle(screen, (255, 255, 255), (x0 + y, y0 + x), 2)
    pygame.draw.circle(screen, (255, 255, 255), (x0 - y, y0 + x), 2)
    pygame.draw.circle(screen, (255, 255, 255), (x0 + y, y0 - x), 2)
    pygame.draw.circle(screen, (255, 255, 255), (x0 - y, y0 - x), 2)

pygame.init()
screen = pygame.display.set_mode((800, 600))
pygame.display.set_caption("Mid-Point Bresenham Algorithm")

clock = pygame.time.Clock()
run = True

while run:
    clock.tick(60)

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

    screen.fill((0, 0, 0))

    draw_circle(screen, 400, 300, 100)

    pygame.display.flip()

pygame.quit()

这段代码使用pygame库来绘制一个圆。其中draw_circle函数采用中心点(x0, y0)和半径radius作为输入参数，并使用while循环和Bresenham算法来绘制圆上的各个点。最后，在主循环中使用pygame.display.flip()函数来更新窗口并显示圆。注意代码中的注释以及函数draw_points(draw circle的单个点)中的代码，以了解更多细节。