Qt实现Flappy Bird游戏

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();
 }
}