python的pybox2d示例代码

你好，以下是pybox2d示例代码：

import pygame
import Box2D

# 创建世界
world = Box2D.b2World(gravity=(0, -10), doSleep=True)

# 创建地面
ground_body = world.CreateStaticBody(
    position=(0, -10),
    shapes=Box2D.b2PolygonShape(box=(50, 10)),
)

# 创建盒子
box_body = world.CreateDynamicBody(position=(0, 4))
box_shape = Box2D.b2PolygonShape(box=(1, 1))
box_fixture = box_body.CreateFixture(shape=box_shape, density=1)

# 创建屏幕
screen = pygame.display.set_mode((640, 480))

# 渲染循环
clock = pygame.time.Clock()
running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    # 更新世界
    world.Step(1/60, 6, 2)

    # 清空屏幕
    screen.fill((255, 255, 255))

    # 绘制地面
    for fixture in ground_body.fixtures:
        shape = fixture.shape
        vertices = [(ground_body.transform * v) * 10 for v in shape.vertices]
        vertices = [(v[0], 480 - v[1]) for v in vertices]
        pygame.draw.polygon(screen, (0, 0, 255), vertices)

    # 绘制盒子
    for fixture in box_body.fixtures:
        shape = fixture.shape
        vertices = [(box_body.transform * v) * 10 for v in shape.vertices]
        vertices = [(v[0], 480 - v[1]) for v in vertices]
        pygame.draw.polygon(screen, (255, 0, 0), vertices)

    # 刷新屏幕
    pygame.display.flip()

    # 控制帧率
    clock.tick(60)

# 退出程序
pygame.quit()