- Qt 5.5
- Qt Widgets
- Animated Tiles Example
- main.cpp Example File
- Qt 5.5.1 Reference Documentation

# main.cpp Example File

animation/animatedtiles/main.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** 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.
    **   * Neither the name of The Qt Company Ltd nor the names of its
    **     contributors may be used to endorse or promote products derived
    **     from this software without specific prior written permission.
    **
    **
    ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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    ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
    ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
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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 Q_DECL_OVERRIDE
        {
            return QRectF(-65, -65, 130, 130);
        }

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

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

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

    private:
        QPixmap _pix;
    };

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

    protected:
        void resizeEvent(QResizeEvent *event) Q_DECL_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"