在Pygame中绘制半圆

import pygame
import math

# 初始化Pygame
pygame.init()

# 设置窗口尺寸
width, height = 800, 600
screen = pygame.display.set_mode((width, height))

# 设置背景颜色
bg_color = (255, 255, 255)
screen.fill(bg_color)

# 设置圆心坐标和半径
center_x, center_y = width // 2, height // 2
radius = 100

# 设置起始角度和终止角度
start_angle = 0
end_angle = math.pi

# 设置线条颜色和宽度
line_color = (0, 0, 0)
line_width = 2

# 绘制半圆
pygame.draw.arc(screen, line_color, (center_x - radius, center_y - radius, radius * 2, radius * 2), start_angle, end_angle, line_width)

# 刷新屏幕
pygame.display.flip()

# 游戏主循环
running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

# 退出Pygame
pygame.quit()