根据鼠标位置添加一个力。

处理鼠标位置：

mouse_pos = Vector2(pygame.mouse.get_pos())

在游戏循环中，可以创建一个事件来对鼠标位置进行更新：

for event in pygame.event.get():
    if event.type == pygame.MOUSEMOTION:
        mouse_pos = Vector2(pygame.mouse.get_pos())

为对象添加一个力：

force_direction = mouse_pos - object_position
force_direction.normalize() # 应该总是规范化（标准化）
object.add_force(force_direction)

在这里，force_direction 表示从对象位置到鼠标位置的向量，normalize() 函数可以将其规范化为长度为 1 的向量，然后将其与对象的添加力进行合并。

完整代码示例：

import pygame
from pygame.math import Vector2

class GameObject:
    def __init__(self, x, y):
        self.position = Vector2(x, y)
        self.velocity = Vector2(0, 0)
        self.acceleration = Vector2(0, 0)

    def add_force(self, force):
        self.acceleration += force

    def update(self):
        self.velocity += self.acceleration
        self.position += self.velocity
        self.acceleration *= 0

pygame.init()
screen = pygame.display.set_mode((640, 480))
clock = pygame.time.Clock()

objects = []
for i in range(20):
    position = Vector2(pygame.math.Vector2(random.randrange(0, 640), random.randrange(0, 480)))
    object = GameObject(*position)
    objects.append(object)

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        if event.type == pygame.MOUSEMOTION:
            mouse_pos = Vector2(pygame.mouse.get_pos())
            for object in objects:
                force_direction = mouse_pos - object.position
                force_direction.normalize() # 极其重要的规范化
                object.add_force(force_direction)

    screen.fill((255, 255, 255))
    for object in objects:
        object.update()
        pygame.draw.circle(screen, (0, 0, 0), object.position, 10)
    pygame.display.flip()

    clock.tick(60)