Qt之FlappyBird游戏开发

Qt之FlappyBird游戏开发

简述

最近浏览网站的时候，忘记在哪里看的这个FlappyBird了，这个小游戏在之前小火了一段时间。今天用QT简单的实现了一把，然后在网上找了一些相关的切图，便进行了制作。难度不是很大，只是通过写这篇博客，能有点启发以及大家共同学习。

效果图

代码

主界面控制

MainWindow::MainWindow(QWidget *parent)
    : BasicWindow(parent)
    , m_startGame(false)
{
    ui.setupUi(this);
    setAttribute(Qt::WA_TranslucentBackground);
    initControl();
}

void MainWindow::initControl()
{
    loadStyleSheet("MainWindow");
    m_scene = new MainGraphicsScene(this, rect());
    QGraphicsView* view = new QGraphicsView(m_scene, this);

    view->setScene(m_scene);
    view->setStyleSheet("border:none; background:transparent;");
    view->setCacheMode(QGraphicsView::CacheBackground);
    startWelcome();
}

void MainWindow::startWelcome()
{
    //道路
    GraphicsRoadItem *roadItem = new GraphicsRoadItem(m_scene);

    //小鸟
    m_bird = new FlappyBird(m_scene);

    //管道
    GraphicsPipeitem *pipeItem = new GraphicsPipeitem(m_scene);

    //游戏状态检测，开启定时器，50ms检测一次
    m_checkGameStatus = new QTimer(this);
    connect(m_checkGameStatus, SIGNAL(timeout()), this, SLOT(onCheckGameStatus()));

    //flappybird字母
    static const int nLetters = 10;
    static struct {
        char const *pix;
        qreal initX, initY;
        qreal destX, destY;
    } letterData[nLetters] = {
        { "F", -1000, -1000, 150, 100 },
        { "L", -800, -1000, 200, 100 },
        { "A", -600, -1000, 250, 100 },
        { "P", -400, -1000, 300, 100 },
        { "P", 1000, 2000, 350, 100 },
        { "Y", 800, 2000, 400, 100 },
        { "B", 600, 2000, 260, 160 },
        { "I", 400, 2000, 310, 160 },
        { "R", 200, 2000, 360, 160 },
        { "D", 0, 2000, 410, 160 } };

    QSequentialAnimationGroup * lettersGroupMoving = new QSequentialAnimationGroup(this);
    m_lettersGroupFading = new QParallelAnimationGroup(this);

    for (int i = 0; i < nLetters; ++i) {
        QString& htmlText = QString("<span style=\"font-family:'Berlin Sans FB';font-size:48px;font-weight:600;color:#194819;\">%1</span>").arg(letterData[i].pix);
        QGraphicsTextItem *letter = new QGraphicsTextItem();
        letter->setHtml(htmlText);
        letter->setPos(letterData[i].initX, letterData[i].initY);

        QPropertyAnimation *moveAnim = new QPropertyAnimation(letter, "pos", lettersGroupMoving);
        moveAnim->setEndValue(QPointF(letterData[i].destX, letterData[i].destY));
        moveAnim->setDuration(200);
        moveAnim->setEasingCurve(QEasingCurve::OutElastic);
        lettersGroupMoving->addPause(50);

        QPropertyAnimation *fadeAnim = new QPropertyAnimation(letter, "opacity", m_lettersGroupFading);
        fadeAnim->setDuration(1000);
        fadeAnim->setEndValue(0);
        fadeAnim->setEasingCurve(QEasingCurve::OutQuad);

        m_scene->addItem(letter);
    }
    lettersGroupMoving->start(QAbstractAnimation::DeleteWhenStopped);

    //游戏开始按钮
    QPixmap&& pix = QPixmap(":/FlappyBird/Resources/texture/startButton.png").scaled(QSize(160, 48), Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
    GraphicsButtonItem* btnItem = new GraphicsButtonItem(pix, m_scene);
    btnItem->setPos(QPointF(220, 340));
    QPropertyAnimation *fadeAnim = new QPropertyAnimation(btnItem, "opacity", m_lettersGroupFading);
    fadeAnim->setDuration(600);
    fadeAnim->setEndValue(0);
    fadeAnim->setEasingCurve(QEasingCurve::OutQuad);
    connect(btnItem, SIGNAL(clicked()), this, SLOT(onStartBtnClicked()));
    connect(fadeAnim, &QPropertyAnimation::finished, [this](){
        m_startGame = true;
        m_checkGameStatus->start(50);
        m_bird->flyLandfallAnimation();
    });
}

void MainWindow::onCheckGameStatus()
{
    //检测小鸟是否与地面和管道发生碰撞
    if (m_bird->checkIsCollided())
    {
        GameOver();
    }
}

void MainWindow::GameOver()
{
    static const int nLetters = 8;
    static struct {
        char const *pix;
        qreal initX, initY;
        qreal destX, destY;
    } letterData[nLetters] = {
        { "G", -1000, -1000, 150, 100 },
        { "A", -800, -1000, 200, 100 },
        { "M", -600, -1000, 250, 100 },
        { "E", -400, -1000, 300, 100 },
        { "O", 600, 2000, 260, 160 },
        { "V", 400, 2000, 310, 160 },
        { "E", 200, 2000, 360, 160 },
        { "R", 0, 2000, 410, 160 } };

    QParallelAnimationGroup * lettersGroupMoving = new QParallelAnimationGroup(this);

    for (int i = 0; i < nLetters; ++i) {
        QString& htmlText = QString("<span style=\"font-family:'Berlin Sans FB';font-size:48px;font-weight:600;color:#194819;\">%1</span>").arg(letterData[i].pix);
        QGraphicsTextItem *letter = new QGraphicsTextItem();
        letter->setHtml(htmlText);
        letter->setPos(letterData[i].initX, letterData[i].initY);

        QPropertyAnimation *moveAnim = new QPropertyAnimation(letter, "pos", lettersGroupMoving);
        moveAnim->setEndValue(QPointF(letterData[i].destX, letterData[i].destY));
        moveAnim->setDuration(200);
        moveAnim->setEasingCurve(QEasingCurve::OutElastic);
        m_scene->addItem(letter);
    }
    lettersGroupMoving->start(QAbstractAnimation::DeleteWhenStopped);

    m_scene->removeItem(m_bird);
}

void MainWindow::onStartBtnClicked()
{
    m_lettersGroupFading->start(QAbstractAnimation::DeleteWhenStopped);
}

void MainWindow::keyPressEvent(QKeyEvent *event)
{
    if (m_startGame)
    {
        m_bird->keyPressEvent(event);
    }
}

小鸟组件绘制

FlappyBird::FlappyBird(QGraphicsScene *scene): m_curflyStatus(0)
          , m_IsLandFall(true)
          , m_IsRaise(true)
{
    scene->addItem(this);
    m_scene = scene;
    m_birdRefreashTime = new QTimer(this);
    connect(m_birdRefreashTime, SIGNAL(timeout()), this, SLOT(onRefreashBird()));
    m_birdRefreashTime->start(12);

    m_flyAnimation = new QPropertyAnimation(this, "pos");
}

void FlappyBird::onRefreashBird()
{
    update();
}

QRectF FlappyBird::boundingRect() const
{
    return QRectF(60, FLY_BIRD_SIZE * 5 , FLY_BIRD_SIZE, FLY_BIRD_SIZE);
}

void FlappyBird::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
{
    painter->save();
    if (m_curflyStatus < 10)
    {
        m_curflyStatus++;
        painter->drawImage(boundingRect(), QImage(":/FlappyBird/Resources/texture/bird1.png"));
    }
    else if (m_curflyStatus < 20)
    {
        m_curflyStatus++;
        painter->drawImage(boundingRect(), QImage(":/FlappyBird/Resources/texture/bird2.png"));
    }
    else if ( m_curflyStatus < 30)
    {
        m_curflyStatus++;
        painter->drawImage(boundingRect(), QImage(":/FlappyBird/Resources/texture/bird3.png"));
    }
    else
    {
        m_curflyStatus = 0;
    }
    painter->restore();
}

void FlappyBird::flyRaiseAnimation()
{
    if (m_IsRaise)
    {
        m_IsLandFall = false;
        m_IsRaise = false;
        m_flyAnimation->stop();

        if (pos().y() > -180)
        {
            m_flyAnimation->setDuration(300);
            m_flyAnimation->setEndValue(QPoint(pos().x(), pos().y() - FLY_BIRD_SIZE));
        }
        else
        {
            m_flyAnimation->setDuration(300);
            m_flyAnimation->setEndValue(pos());
        }
        m_flyAnimation->setEasingCurve(QEasingCurve::OutQuad);
        m_flyAnimation->start();
        connect(m_flyAnimation, SIGNAL(finished()), this, SLOT(onFlyRaiseAnimationFinished()));
    }
}

void FlappyBird::onFlyRaiseAnimationFinished()
{
    m_flyAnimation->disconnect(SIGNAL(finished()));
    m_IsRaise = true;
    m_IsLandFall = true;
    flyLandfallAnimation();
}

void FlappyBird::flyLandfallAnimation()
{
    if (m_birdRefreashTime->isActive())
    {
        m_birdRefreashTime->stop();
    }

    if (m_IsLandFall)
    {
        m_flyAnimation->stop();
        int fallHeight = m_scene->height() - pos().y();
        int time = 1000 * fallHeight / m_scene->height();
        m_flyAnimation->setDuration(time);
        m_flyAnimation->setEndValue(QPoint(pos().x(), pos().y() + fallHeight));
        m_flyAnimation->setEasingCurve(QEasingCurve::InQuad);
        m_flyAnimation->start();
        m_IsLandFall = false;
    }
}

bool FlappyBird::checkIsCollided()
{
    if (!collidingItems().isEmpty())
        return true;
    else
        return false;
}

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

游戏开始按钮

GraphicsButtonItem::GraphicsButtonItem(const QPixmap &pixmap, QGraphicsScene *scene) : pix(pixmap)
{
    scene->addItem(this);
    setCursor(QCursor(Qt::PointingHandCursor));
}

void GraphicsButtonItem::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    if (event->button() == Qt::LeftButton)
    {
        emit clicked();
    }
    __super::mousePressEvent(event);
}

QSizeF GraphicsButtonItem::size() const
{
    return pix.size();
}

QRectF GraphicsButtonItem::boundingRect() const
{
    return QRectF(QPointF(0, 0), pix.size());
}

void GraphicsButtonItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
{
    painter->drawPixmap(0, 0, pix);
}

管道组件绘制

#define PIPE_WIDTH 60

GraphicsPipeitem::GraphicsPipeitem(QGraphicsScene *scene)
{
    m_scene = scene;
    m_scene->addItem(this);

    createPipeHeight();
    startMove();
}
void GraphicsPipeitem::createPipeHeight()
{
    m_upPipeHeight = qrand() % 100 + 80;
    m_downPipeHeight = m_scene->height() - m_upPipeHeight - 178;
}

QRectF GraphicsPipeitem::boundingRect() const
{
    return QRectF(m_scene->width(), 0, PIPE_WIDTH, m_scene->height());
}

QPainterPath GraphicsPipeitem::shape() const
{
    QPainterPath path;
    path.addRect(QRectF(m_scene->width(), 0, PIPE_WIDTH, m_upPipeHeight));
    path.addRect(QRectF(m_scene->width(), m_upPipeHeight + 140, PIPE_WIDTH, m_downPipeHeight));
    return path;
}


void GraphicsPipeitem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    painter->save();
    painter->drawImage(QRectF(m_scene->width(), 0, PIPE_WIDTH, m_upPipeHeight), QImage(":/FlappyBird/Resources/texture/tubeup.png").scaled(PIPE_WIDTH, m_upPipeHeight));
    painter->drawImage(QRectF(m_scene->width(), m_upPipeHeight + 140, PIPE_WIDTH, m_downPipeHeight), QImage(":/FlappyBird/Resources/texture/tubedown.png").scaled(PIPE_WIDTH, m_downPipeHeight));
    painter->restore();
}

void GraphicsPipeitem::startMove()
{
    QPropertyAnimation* moveAnimation = new QPropertyAnimation(this, "pos");
    moveAnimation->setLoopCount(-1);
    moveAnimation->setDuration(3000);
    moveAnimation->setStartValue(QPoint(0, pos().y()));
    moveAnimation->setEndValue(QPoint(-1 * m_scene->width() - PIPE_WIDTH, pos().y()));
    moveAnimation->start();
    connect(moveAnimation, &QPropertyAnimation::currentLoopChanged, [this](int loopCount){
        createPipeHeight();
    });
}

地面绘制

#define ROAD_ITEM_HEIGHT 38

GraphicsRoadItem::GraphicsRoadItem(QGraphicsScene *scene) :m_scene(scene)
{
    scene->addItem(this);
    startMove();
}

QRectF GraphicsRoadItem::boundingRect() const
{
    return QRectF(0, m_scene->height() - ROAD_ITEM_HEIGHT, m_scene->width() * 2, ROAD_ITEM_HEIGHT);
}

void GraphicsRoadItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *, QWidget *)
{
    painter->drawImage(QRectF(0, m_scene->height() - ROAD_ITEM_HEIGHT, m_scene->width(), ROAD_ITEM_HEIGHT), QImage(":/FlappyBird/Resources/texture/road.png"));
    painter->drawImage(QRectF(m_scene->width(), m_scene->height() - ROAD_ITEM_HEIGHT, m_scene->width(), ROAD_ITEM_HEIGHT), QImage(":/FlappyBird/Resources/texture/road.png"));
}

void GraphicsRoadItem::startMove()
{
    QPropertyAnimation* moveAnimation = new QPropertyAnimation(this, "pos");
    moveAnimation->setLoopCount(-1);
    moveAnimation->setDuration(6000);
    moveAnimation->setStartValue(QPoint(0, pos().y()));
    moveAnimation->setEndValue(QPoint(0 - m_scene->width(), pos().y()));
    moveAnimation->setEasingCurve(QEasingCurve::Linear);
    moveAnimation->start();
}

结尾

全部代码，都在上面了，希望对大伙有所点启发和帮助，只为记录，只为分享! 愿所写能对你有所帮助。不忘记点个赞，谢谢~