qt写贪吃蛇游戏，要求两条蛇

好的，下面是一份简单的 Qt 贪吃蛇游戏代码，其中包括两条蛇：

#include <QtWidgets>

const int WIDTH = 400;  // 游戏界面宽度
const int HEIGHT = 400;  // 游戏界面高度

class Snake : public QGraphicsItem
{
public:
    Snake(QPointF pos, qreal w, qreal h, QColor color, QGraphicsItem *parent = nullptr)
        : QGraphicsItem(parent), m_rect(pos.x(), pos.y(), w, h), m_color(color)
    {}

    QRectF boundingRect() const override
    {
        return m_rect;
    }

    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override
    {
        Q_UNUSED(option);
        Q_UNUSED(widget);
        painter->setBrush(QBrush(m_color));
        painter->drawRect(m_rect);
    }

    void move(int dx, int dy)
    {
        m_rect.translate(dx, dy);
        setPos(m_rect.topLeft());
    }

private:
    QRectF m_rect;
    QColor m_color;
};

class Food : public QGraphicsItem
{
public:
    Food(QPointF pos, qreal w, qreal h, QColor color, QGraphicsItem *parent = nullptr)
        : QGraphicsItem(parent), m_rect(pos.x(), pos.y(), w, h), m_color(color)
    {}

    QRectF boundingRect() const override
    {
        return m_rect;
    }

    void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) override
    {
        Q_UNUSED(option);
        Q_UNUSED(widget);
        painter->setBrush(QBrush(m_color));
        painter->drawEllipse(m_rect);
    }

private:
    QRectF m_rect;
    QColor m_color;
};

class Game : public QGraphicsView
{
public:
    Game(QWidget *parent = nullptr)
        : QGraphicsView(parent), m_scene(new QGraphicsScene(this)), m_timer(new QTimer(this))
    {
        setFixedSize(WIDTH, HEIGHT);
        setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
        setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
        setScene(m_scene);

        m_timer->setInterval(100);
        connect(m_timer, &QTimer::timeout, this, &Game::moveSnakes);
    }

    void start()
    {
        m_snake1 = new Snake(QPointF(100, 100), 10, 10, Qt::blue, nullptr);
        m_snake2 = new Snake(QPointF(300, 300), 10, 10, Qt::green, nullptr);
        m_scene->addItem(m_snake1);
        m_scene->addItem(m_snake2);
        spawnFood();

        m_timer->start();
    }

private:
    void keyPressEvent(QKeyEvent *event) override
    {
        switch (event->key()) {
        case Qt::Key_Left:
            m_snake1->move(-10, 0);
            break;
        case Qt::Key_Right:
            m_snake1->move(10, 0);
            break;
        case Qt::Key_Up:
            m_snake1->move(0, -10);
            break;
        case Qt::Key_Down:
            m_snake1->move(0, 10);
            break;
        case Qt::Key_A:
            m_snake2->move(-10, 0);
            break;
        case Qt::Key_D:
            m_snake2->move(10, 0);
            break;
        case Qt::Key_W:
            m_snake2->move(0, -10);
            break;
        case Qt::Key_S:
            m_snake2->move(0, 10);
            break;
        }
    }

    void spawnFood()
    {
        qreal x = QRandomGenerator::global()->bounded(0, WIDTH - 10);
        qreal y = QRandomGenerator::global()->bounded(0, HEIGHT - 10);
        m_food = new Food(QPointF(x, y), 10, 10, Qt::red, nullptr);
        m_scene->addItem(m_food);
    }

    void moveSnakes()
    {
        QList<QGraphicsItem*> items = m_scene->items();
        for (QGraphicsItem *item : items) {
            if (item == m_food) {
                if (m_snake1->collidesWithItem(m_food)) {
                    m_snake1->setRect(m_snake1->rect().adjusted(-10, -10, 10, 10));
                    spawnFood();
                } else if (m_snake2->collidesWithItem(m_food)) {
                    m_snake2->setRect(m_snake2->rect().adjusted(-10, -10, 10, 10));
                    spawnFood();
                }
            } else if (item == m_snake1 || item == m_snake2) {
                QGraphicsItem::ShapeMode mode = QGraphicsItem::Type;
                QList<QGraphicsItem*> collidingItems = item->collidingItems(mode);
                for (QGraphicsItem *collidingItem : collidingItems) {
                    if (collidingItem == m_snake1 || collidingItem == m_snake2) {
                        m_timer->stop();
                        QMessageBox::information(this, "Game Over", "Game Over!");
                        return;
                    }
                }
            }
        }

        m_snake1->move(0, 10);
        m_snake2->move(0, -10);
    }

    QGraphicsScene *m_scene;
    QTimer *m_timer;
    Snake *m_snake1;
    Snake *m_snake2;
    Food *m_food;
};

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    Game game;
    game.show();
    game.start();
    return app.exec();
}

这份代码使用了 Qt 的 QGraphicsScene 和 QGraphicsItem 类来实现游戏界面，其中包括两条蛇和一个食物。玩家可以使用键盘控制其中一条蛇的移动，另一条蛇则以固定速度自动移动。当一条蛇吃到食物后，它的身体会变长，并且会重新生成一个食物。如果两条蛇相撞，则游戏结束。