SFML如何让各种形状在随机方向上移动？

#include <SFML/Graphics.hpp>
#include <random>

int main()
{
    sf::RenderWindow window(sf::VideoMode(800, 600), "SFML Shapes Moving");

    // 创建形状对象
    sf::RectangleShape rectangle(sf::Vector2f(100, 50));
    rectangle.setFillColor(sf::Color::Red);
    rectangle.setPosition(100, 100);

    sf::CircleShape circle(50);
    circle.setFillColor(sf::Color::Blue);
    circle.setPosition(400, 300);

    // 创建随机数生成器
    std::random_device rd;
    std::mt19937 gen(rd());
    std::uniform_real_distribution<float> dis(-1.0f, 1.0f);

    sf::Vector2f rectangleDirection(dis(gen), dis(gen));
    sf::Vector2f circleDirection(dis(gen), dis(gen));

    while (window.isOpen())
    {
        sf::Event event;
        while (window.pollEvent(event))
        {
            if (event.type == sf::Event::Closed)
                window.close();
        }

        // 更新形状位置
        rectangle.move(rectangleDirection);
        circle.move(circleDirection);

        // 处理边界碰撞
        if (rectangle.getPosition().x < 0 || rectangle.getPosition().x + rectangle.getSize().x > window.getSize().x)
            rectangleDirection.x = -rectangleDirection.x;
        if (rectangle.getPosition().y < 0 || rectangle.getPosition().y + rectangle.getSize().y > window.getSize().y)
            rectangleDirection.y = -rectangleDirection.y;

        if (circle.getPosition().x - circle.getRadius() < 0 || circle.getPosition().x + circle.getRadius() > window.getSize().x)
            circleDirection.x = -circleDirection.x;
        if (circle.getPosition().y - circle.getRadius() < 0 || circle.getPosition().y + circle.getRadius() > window.getSize().y)
            circleDirection.y = -circleDirection.y;

        window.clear();
        // 渲染形状
        window.draw(rectangle);
        window.draw(circle);
        window.display();
    }

    return 0;
}