Qt 5.6 | Qt Widgets | Animated Tiles Example | main.cpp Example File

Qt 5.6.2 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:
      **
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      ** modification, are permitted provided that the following conditions are
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      **   * Redistributions of source code must retain the above copyright
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      **     contributors may be used to endorse or promote products derived
      **     from this software without specific prior written permission.
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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"