main.cpp Example File

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  #include <QtWidgets>
  #include <QtCore/qmath.h>
  #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 override
      {
          return QRectF(-65, -65, 130, 130);
      }

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

      void paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *) override
      {
          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 *) override
      {
          emit pressed();
          update();
      }

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

  private:
      QPixmap _pix;
  };

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

  protected:
      void resizeEvent(QResizeEvent *event) override
      {
          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->setTransform(QTransform::fromScale(0.75, 0.75), true);
      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(qCos((i / 63.0) * 6.28) * 250,
                                                   qSin((i / 63.0) * 6.28) * 250));

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