board.cpp Example File

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 #include "board.h"

 #include <QGraphicsItem>
 #include <QGraphicsScene>
 #include <QDebug>
 #include <QTextDocument>
 #include <QFontMetrics>
 #include <QPropertyAnimation>

 const QColor fg = Qt::white;
 const QColor bg = Qt::black;

 Board::Board(QWidget *parent) :
     QGraphicsView(parent)
 {
     scene = new QGraphicsScene(QRect(0, 0, 640, 360), this);

     scene->setBackgroundBrush(QBrush(bg));

     ball = scene->addRect(-6, -6, 12, 12, QPen(Qt::SolidLine), QBrush(fg));
     ball->setPos(Width/2-6, Height/2-6);

     // why is y -1...otherwise we have a gap...
     topWall = scene->addRect(0, -1, Width, 12, QPen(Qt::SolidLine), QBrush(fg));
     bottomWall = scene->addRect(0, Height-12, Width, 12, QPen(Qt::SolidLine), QBrush(fg));

     leftPaddle = scene->addRect(0, 12, 12, Paddle, QPen(Qt::SolidLine), QBrush(fg));
     rightPaddle = scene->addRect(Width-12, 12, 12, Paddle, QPen(Qt::SolidLine), QBrush(fg));

     QPen p;
     p.setWidth(2);
     p.setStyle(Qt::DotLine);
     p.setBrush(QBrush(fg));
     scene->addLine(Width/2, 0, Width/2, Height, p);

     QFont f;
     f.setStyleHint(QFont::OldEnglish);
     f.setPixelSize(50);
     f.setBold(true);
     leftScore = scene->addText(QString("0"), f);
     leftScore->setDefaultTextColor(fg);
 //    leftScore->setPos(120, 50);

     rightScore = scene->addText(QString("0"), f);
 //    rightScore->setPos(Width-140, 50);
     rightScore->setDefaultTextColor(fg);
     setScore(0, 0);

     f.setPixelSize(25);
     status = scene->addText(QString(), f);
     status->setDefaultTextColor(fg);

     ball->setCacheMode(QGraphicsItem::DeviceCoordinateCache);
     leftPaddle->setCacheMode(QGraphicsItem::DeviceCoordinateCache);
     rightPaddle->setCacheMode(QGraphicsItem::DeviceCoordinateCache);

     icon.load(QString(":/icons/connect.png"));
     icon = icon.scaled(100, 100, Qt::IgnoreAspectRatio, Qt::SmoothTransformation);
     qDebug() << "icon" << icon.isNull();
     connectIcon = scene->addPixmap(icon);
     connectIcon->setPos(440,200);
     connectIcon->setAcceptTouchEvents(true);
     connectIcon->setTransformOriginPoint(50,50);
     connectIcon->setTransformationMode(Qt::SmoothTransformation);

     connectAnimation = new QPropertyAnimation(this, "connectRotation");
     connectAnimation->setDuration(1000);
     connectAnimation->setLoopCount(-1);
     connectAnimation->setStartValue(0);
     connectAnimation->setEndValue(360);

     setCacheMode(QGraphicsView::CacheBackground);
     setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);

 //    connect(scene, SIGNAL(changed(QList<QRectF>)), this, SLOT(sceneChanged(QList<QRectF>)));

 }
 void Board::setBall(int x, int y)
 {
     ball->setPos(x, y);
     checkBall(x, y);
 }

 void Board::setLeftPaddle(int y)
 {
     leftPaddle->setPos(0, y);
 }

 void Board::setRightPaddle(int y)
 {
     rightPaddle->setPos(0, y);
 }

 void Board::sceneChanged(const QList<QRectF> &region)
 {
     Q_UNUSED(region);

     QList<QGraphicsItem *>items = scene->collidingItems(ball);
     while (!items.empty()) {
         QGraphicsItem *i = items.takeFirst();
         if (i == topWall)
             emit ballCollision(Top);
         if (i == bottomWall)
             emit ballCollision(Bottom);
         if (i == leftPaddle)
             emit ballCollision(Left);
         if (i == rightPaddle)
             emit ballCollision(Right);
     }

 }

 void Board::checkBall(int x, int y)
 {
   int ly = leftPaddle->y();
   int ry = rightPaddle->y();

   if (x > 646)
       emit scored(Right);
   else if (x < -6)
       emit scored(Left);

   if (y < 18)
       emit ballCollision(Top);
   else if (y > 360-18)
       emit ballCollision(Bottom);

   if ((x < 18) &&
       (y > ly-6) &&
       (y < ly+Paddle+6))
       emit ballCollision(Left);

   if ((x > 640-18) &&
       (y > ry-6) &&
       (y < ry+Paddle+6))
       emit ballCollision(Right);
 }

 void Board::setScore(int l, int r)
 {
     QString left = QString("%1").arg(l);
     QString right = QString("%1").arg(r);
     leftScore->document()->setPlainText(left);
     rightScore->document()->setPlainText(right);
     QFontMetrics fm(leftScore->font());
     leftScore->setPos(Width/4 - fm.width(left)/2, 50);
     rightScore->setPos(3*Width/4 - fm.width(right)/2, 50);

 }

 void Board::setStatus(QString text, int opacity_start, int opacity_end)
 {

     status->document()->setPlainText(text);
     status->setPos(24, Height-25-25);
     QPropertyAnimation *a = new QPropertyAnimation(status, "opacity");
     a->setDuration(2000);
     a->setStartValue(opacity_start/100.0);
     a->setEndValue(opacity_end/100.0);
     a->start(QAbstractAnimation::DeleteWhenStopped);
 }

 void Board::setConnectRotation(int rot)
 {
     connectIcon->setRotation(rot);
 //    QTransform t;
 //    t.rotate(rot);
 //    connectIcon->setPixmap(icon.scaled(100, 100).transformed(t, Qt::SmoothTransformation));
 }

 void Board::setConnectOpacity(qreal op)
 {
     connectIcon->setOpacity(op);
 }

 void Board::animateConnect(bool start)
 {
     if (start) {
         connectAnimation->start();
     }
     else {
         connectAnimation->stop();
         QPropertyAnimation *a = new QPropertyAnimation(this, "connectRotation");
 //        qDebug() << "currentTime" << connectAnimation->currentLoopTime() << "rotation" << connectAnimation->currentValue();
         a->setDuration(connectAnimation->currentLoopTime()/2);
         a->setStartValue(connectAnimation->currentValue().toInt( ));
         a->setEndValue(0);
 //        a->setDirection(QAbstractAnimation::Backward);
         a->start(QAbstractAnimation::DeleteWhenStopped);
     }
 }

 void Board::fadeConnect(bool out)
 {
     qreal start = 100.0;
     qreal end = 0.0;

     if (!out) {
         start = 0.0;
         end = 100.0;
     }

     QPropertyAnimation *a = new QPropertyAnimation(this, "connectOpacity");
     a->setDuration(2000);
     a->setStartValue(start);
     a->setEndValue(end);
     a->start(QAbstractAnimation::DeleteWhenStopped);
 }