Qt实现Flappy Bird游戏

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);
 }
}

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();
 }
}

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);
}

#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();
 });
}

#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();
}