main.cpp Example File

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 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: http://www.qt-project.org/
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 ** This file is part of the QtCore module of the Qt Toolkit.
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 #include <QtWidgets>
 #include <QtCore/qstate.h>

 class Pixmap : public QObject, public QGraphicsPixmapItem
 {
     Q_OBJECT
     Q_PROPERTY(QPointF pos READ pos WRITE setPos)
 public:
     Pixmap(const QPixmap &pix)
         : QObject(), QGraphicsPixmapItem(pix)
     {
         setCacheMode(DeviceCoordinateCache);
     }
 };

 class Button : public QGraphicsWidget
 {
     Q_OBJECT
 public:
     Button(const QPixmap &pixmap, QGraphicsItem *parent = 0)
         : QGraphicsWidget(parent), _pix(pixmap)
     {
         setAcceptHoverEvents(true);
         setCacheMode(DeviceCoordinateCache);
     }

     QRectF boundingRect() const
     {
         return QRectF(-65, -65, 130, 130);
     }

     QPainterPath shape() const
     {
         QPainterPath path;
         path.addEllipse(boundingRect());
         return path;
     }

     void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *)
     {
         bool down = option->state & QStyle::State_Sunken;
         QRectF r = boundingRect();
         QLinearGradient grad(r.topLeft(), r.bottomRight());
         grad.setColorAt(down ? 1 : 0, option->state & QStyle::State_MouseOver ? Qt::white : Qt::lightGray);
         grad.setColorAt(down ? 0 : 1, Qt::darkGray);
         painter->setPen(Qt::darkGray);
         painter->setBrush(grad);
         painter->drawEllipse(r);
         QLinearGradient grad2(r.topLeft(), r.bottomRight());
         grad.setColorAt(down ? 1 : 0, Qt::darkGray);
         grad.setColorAt(down ? 0 : 1, Qt::lightGray);
         painter->setPen(Qt::NoPen);
         painter->setBrush(grad);
         if (down)
             painter->translate(2, 2);
         painter->drawEllipse(r.adjusted(5, 5, -5, -5));
         painter->drawPixmap(-_pix.width()/2, -_pix.height()/2, _pix);
     }

 signals:
     void pressed();

 protected:
     void mousePressEvent(QGraphicsSceneMouseEvent *)
     {
         emit pressed();
         update();
     }

     void mouseReleaseEvent(QGraphicsSceneMouseEvent *)
     {
         update();
     }

 private:
     QPixmap _pix;
 };

 class View : public QGraphicsView
 {
 public:
     View(QGraphicsScene *scene) : QGraphicsView(scene) { }

 protected:
     void resizeEvent(QResizeEvent *event)
     {
         QGraphicsView::resizeEvent(event);
         fitInView(sceneRect(), Qt::KeepAspectRatio);
     }
 };

 int main(int argc, char **argv)
 {
     Q_INIT_RESOURCE(animatedtiles);

     QApplication app(argc, argv);

     QPixmap kineticPix(":/images/kinetic.png");
     QPixmap bgPix(":/images/Time-For-Lunch-2.jpg");

     QGraphicsScene scene(-350, -350, 700, 700);

     QList<Pixmap *> items;
     for (int i = 0; i < 64; ++i) {
         Pixmap *item = new Pixmap(kineticPix);
         item->setOffset(-kineticPix.width()/2, -kineticPix.height()/2);
         item->setZValue(i);
         items << item;
         scene.addItem(item);
     }

     // Buttons
     QGraphicsItem *buttonParent = new QGraphicsRectItem;
     Button *ellipseButton = new Button(QPixmap(":/images/ellipse.png"), buttonParent);
     Button *figure8Button = new Button(QPixmap(":/images/figure8.png"), buttonParent);
     Button *randomButton = new Button(QPixmap(":/images/random.png"), buttonParent);
     Button *tiledButton = new Button(QPixmap(":/images/tile.png"), buttonParent);
     Button *centeredButton = new Button(QPixmap(":/images/centered.png"), buttonParent);

     ellipseButton->setPos(-100, -100);
     figure8Button->setPos(100, -100);
     randomButton->setPos(0, 0);
     tiledButton->setPos(-100, 100);
     centeredButton->setPos(100, 100);

     scene.addItem(buttonParent);
     buttonParent->scale(0.75, 0.75);
     buttonParent->setPos(200, 200);
     buttonParent->setZValue(65);

     // States
     QState *rootState = new QState;
     QState *ellipseState = new QState(rootState);
     QState *figure8State = new QState(rootState);
     QState *randomState = new QState(rootState);
     QState *tiledState = new QState(rootState);
     QState *centeredState = new QState(rootState);

     // Values
     for (int i = 0; i < items.count(); ++i) {
         Pixmap *item = items.at(i);
         // Ellipse
         ellipseState->assignProperty(item, "pos",
                                          QPointF(cos((i / 63.0) * 6.28) * 250,
                                                  sin((i / 63.0) * 6.28) * 250));

         // Figure 8
         figure8State->assignProperty(item, "pos",
                                          QPointF(sin((i / 63.0) * 6.28) * 250,
                                                  sin(((i * 2)/63.0) * 6.28) * 250));

         // Random
         randomState->assignProperty(item, "pos",
                                         QPointF(-250 + qrand() % 500,
                                                 -250 + qrand() % 500));

         // Tiled
         tiledState->assignProperty(item, "pos",
                                        QPointF(((i % 8) - 4) * kineticPix.width() + kineticPix.width() / 2,
                                                ((i / 8) - 4) * kineticPix.height() + kineticPix.height() / 2));

         // Centered
         centeredState->assignProperty(item, "pos", QPointF());
     }

     // Ui
     View *view = new View(&scene);
     view->setWindowTitle(QT_TRANSLATE_NOOP(QGraphicsView, "Animated Tiles"));
     view->setViewportUpdateMode(QGraphicsView::BoundingRectViewportUpdate);
     view->setBackgroundBrush(bgPix);
     view->setCacheMode(QGraphicsView::CacheBackground);
     view->setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);
     view->show();

     QStateMachine states;
     states.addState(rootState);
     states.setInitialState(rootState);
     rootState->setInitialState(centeredState);

     QParallelAnimationGroup *group = new QParallelAnimationGroup;
     for (int i = 0; i < items.count(); ++i) {
         QPropertyAnimation *anim = new QPropertyAnimation(items[i], "pos");
         anim->setDuration(750 + i * 25);
         anim->setEasingCurve(QEasingCurve::InOutBack);
         group->addAnimation(anim);
     }
     QAbstractTransition *trans = rootState->addTransition(ellipseButton, SIGNAL(pressed()), ellipseState);
     trans->addAnimation(group);

     trans = rootState->addTransition(figure8Button, SIGNAL(pressed()), figure8State);
     trans->addAnimation(group);

     trans = rootState->addTransition(randomButton, SIGNAL(pressed()), randomState);
     trans->addAnimation(group);

     trans = rootState->addTransition(tiledButton, SIGNAL(pressed()), tiledState);
     trans->addAnimation(group);

     trans = rootState->addTransition(centeredButton, SIGNAL(pressed()), centeredState);
     trans->addAnimation(group);

     QTimer timer;
     timer.start(125);
     timer.setSingleShot(true);
     trans = rootState->addTransition(&timer, SIGNAL(timeout()), ellipseState);
     trans->addAnimation(group);

     states.start();

 #ifdef QT_KEYPAD_NAVIGATION
     QApplication::setNavigationMode(Qt::NavigationModeCursorAuto);
 #endif
     return app.exec();
 }

 #include "main.moc"