在Python中模拟重力的问题

import pygame
import random

# 初始化Pygame
pygame.init()

# 定义窗口尺寸
width, height = 800, 600
screen = pygame.display.set_mode((width, height))
pygame.display.set_caption("模拟重力")

# 定义物体类
class Object:
    def __init__(self, x, y, mass):
        self.x = x
        self.y = y
        self.mass = mass
        self.vx = 0
        self.vy = 0

    def update(self, dt):
        # 更新物体的速度和位置
        self.vy += 9.8 * dt  # 重力加速度为9.8 m/s^2
        self.x += self.vx * dt
        self.y += self.vy * dt

    def draw(self):
        # 在屏幕上绘制物体
        pygame.draw.circle(screen, (255, 0, 0), (int(self.x), int(self.y)), 10)

# 创建物体实例
object = Object(width/2, height/2, 1)

# 游戏循环
running = True
clock = pygame.time.Clock()
while running:
    dt = clock.tick(60) / 1000.0  # 控制帧率为60fps

    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False

    # 更新物体
    object.update(dt)

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

    # 绘制物体
    object.draw()

    # 刷新屏幕
    pygame.display.flip()

# 退出Pygame
pygame.quit()