QGraphicscene animation problem



  • i wana to work with animation , based on "animatedtiles" example .
    i write a seprate class for creating QGraphicscene , like this :

    class First_win
    {
     public :
      First_win(){
    
          Q_INIT_RESOURCE(animatedtiles);
    
    
    
          QPixmap kineticPix(":/images/kinetic.png");
    
    
          scene.setSceneRect(-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(0.5, 0.5), true);
          buttonParent->setPos(0, 0);
          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", QPoint(0,0));
          }
    
          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->setDuration(1000);
              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();
    
    
      }
    
    
    QGraphicsScene scene ;
    
    
    };
    
    #endif // MAINWINDOW_H
     
    

    and use this class on main :

     QPixmap bgPix(":/images/Time-For-Lunch-2.jpg");
    
        First_win fw ;
    
        View *view = new View(&(fw.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();
    
    

    bye this codes , the aplication window are shown but animations not work


  • Lifetime Qt Champion

    Hi,

    Your state machine and timer are destroyed at the end of the constructor of First_win thus what's related to them won't execute.


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