Qt Reference Documentation

# main.cpp Example File

animation/animatedtiles/main.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the QtCore module of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
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     **     the names of its contributors may be used to endorse or promote
     **     products derived from this software without specific prior written
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     #include <QtGui>
     #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);
     #ifdef Q_OS_SYMBIAN
         view->showMaximized();
     #else
         view->show();
     #endif

         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"