用qt编写代码：恐龙小游戏

以下是一个简单的恐龙小游戏的Qt代码示例，您可以根据需要进行修改和扩展。

#include <QApplication>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QTimer>
#include <QKeyEvent>
#include <QLabel>
#include <QFont>

class Dinosaur : public QObject, public QGraphicsRectItem
{
    Q_OBJECT

public:
    Dinosaur()
    {
        setRect(0, 0, 30, 30);
    }

    void keyPressEvent(QKeyEvent *event)
    {
        if (event->key() == Qt::Key_Space)
        {
            jump();
        }
    }

public slots:
    void move()
    {
        setPos(x() + 10, y());
    }

private:
    void jump()
    {
        if (onGround)
        {
            onGround = false;
            QTimer *timer = new QTimer(this);
            connect(timer, SIGNAL(timeout()), this, SLOT(fall()));
            timer->start(25);
        }
    }

    void fall()
    {
        setPos(x(), y() + 10);

        if (y() >= groundY)
        {
            setPos(x(), groundY);
            onGround = true;
            QObject::sender()->deleteLater();
        }
    }

    bool onGround = true;
    int groundY = 250;
};

class Obstacle : public QObject, public QGraphicsRectItem
{
    Q_OBJECT

public:
    Obstacle()
    {
        setRect(0, 0, 20, 20);
        setPos(400, 250);
    }

public slots:
    void move()
    {
        setPos(x() - 10, y());

        if (x() < -20)
        {
            QObject::sender()->deleteLater();
        }
    }
};

class Game : public QGraphicsView
{
public:
    Game(QWidget *parent = 0)
        : QGraphicsView(parent)
    {
        scene = new QGraphicsScene(this);
        setScene(scene);
        setFixedSize(800, 600);
        setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
        setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
    }

    void start()
    {
        scene->setBackgroundBrush(Qt::white);

        dinosaur = new Dinosaur();
        dinosaur->setPos(50, 250);
        scene->addItem(dinosaur);

        QTimer *dinoTimer = new QTimer(this);
        connect(dinoTimer, SIGNAL(timeout()), dinosaur, SLOT(move()));
        dinoTimer->start(50);

        QTimer *obstacleTimer = new QTimer(this);
        connect(obstacleTimer, SIGNAL(timeout()), this, SLOT(spawnObstacle()));
        obstacleTimer->start(2000);

        scoreLabel = new QLabel("Score: 0", this);
        scoreLabel->setFont(QFont("Arial", 20));
        scoreLabel->setGeometry(10, 10, 200, 50);
        score = 0;
    }

public slots:
    void spawnObstacle()
    {
        Obstacle *obstacle = new Obstacle();
        scene->addItem(obstacle);

        QTimer *timer = new QTimer(this);
        connect(timer, SIGNAL(timeout()), obstacle, SLOT(move()));
        timer->start(50);

        connect(timer, SIGNAL(timeout()), this, SLOT(updateScore()));
    }

    void updateScore()
    {
        score++;
        scoreLabel->setText("Score: " + QString::number(score));
    }

private:
    QGraphicsScene *scene;
    Dinosaur *dinosaur;
    QLabel *scoreLabel;
    int score;
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    Game game;
    game.show();
    game.start();

    return a.exec();
}

#include "main.moc"

在该示例中，我们创建了一个名为Game的类，它继承自QGraphicsView，它将用于显示游戏场景。在start()函数中，我们为游戏场景添加了一个白色背景、恐龙、定时器和障碍物。恐龙可以通过按下空格键来跳跃，定时器会定期移动恐龙和障碍物，障碍物超出屏幕后会被删除，玩家每成功避开一个障碍物，得分就会增加，分数会显示在屏幕上。

请注意，这只是一个简单的示例，您可以根据需要进行修改和扩展，例如添加更多的障碍物、动画、声音和游戏结束的逻辑。