Qt 4.8: bomb.cpp Example File (demos/sub-attaq/bomb.cpp)

Qt Reference Documentation

- Qt 4.8
- ALL VERSIONS

- A
- A
- A
- Print

# bomb.cpp Example File

demos/sub-attaq/bomb.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.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
     ** Commercial License Usage
     ** Licensees holding valid commercial Qt licenses may use this file in
     ** accordance with the commercial license agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
     ** a written agreement between you and The Qt Company. For licensing terms
     ** and conditions see http://www.qt.io/terms-conditions. For further
     ** information use the contact form at http://www.qt.io/contact-us.
     **
     ** GNU Lesser General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU Lesser
     ** General Public License version 2.1 or version 3 as published by the Free
     ** Software Foundation and appearing in the file LICENSE.LGPLv21 and
     ** LICENSE.LGPLv3 included in the packaging of this file. Please review the
     ** following information to ensure the GNU Lesser General Public License
     ** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
     ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
     **
     ** As a special exception, The Qt Company gives you certain additional
     ** rights. These rights are described in The Qt Company LGPL Exception
     ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
     **
     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.GPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU General Public License version 3.0 requirements will be
     ** met: http://www.gnu.org/copyleft/gpl.html.
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     //Own
     #include "bomb.h"
     #include "submarine.h"
     #include "pixmapitem.h"
     #include "animationmanager.h"
     #include "qanimationstate.h"

     //Qt
     #include <QtCore/QSequentialAnimationGroup>
     #include <QtCore/QPropertyAnimation>
     #include <QtCore/QStateMachine>
     #include <QtCore/QFinalState>

     Bomb::Bomb() : PixmapItem(QString("bomb"), GraphicsScene::Big)
     {
         setZValue(2);
     }

     void Bomb::launch(Bomb::Direction direction)
     {
         QSequentialAnimationGroup *launchAnimation = new QSequentialAnimationGroup;
         AnimationManager::self()->registerAnimation(launchAnimation);
         qreal delta = direction == Right ? 20 : - 20;
         QPropertyAnimation *anim = new QPropertyAnimation(this, "pos");
         anim->setEndValue(QPointF(x() + delta,y() - 20));
         anim->setDuration(150);
         launchAnimation->addAnimation(anim);
         anim = new QPropertyAnimation(this, "pos");
         anim->setEndValue(QPointF(x() + delta*2, y() ));
         anim->setDuration(150);
         launchAnimation->addAnimation(anim);
         anim = new QPropertyAnimation(this, "pos");
         anim->setEndValue(QPointF(x() + delta*2,scene()->height()));
         anim->setDuration(y()/2*60);
         launchAnimation->addAnimation(anim);
         connect(anim,SIGNAL(valueChanged(QVariant)),this,SLOT(onAnimationLaunchValueChanged(QVariant)));
         connect(this, SIGNAL(bombExploded()), launchAnimation, SLOT(stop()));
         //We setup the state machine of the bomb
         QStateMachine *machine = new QStateMachine(this);

         //This state is when the launch animation is playing
         QAnimationState *launched = new QAnimationState(machine);
         launched->setAnimation(launchAnimation);

         //End
         QFinalState *final = new QFinalState(machine);

         machine->setInitialState(launched);

         //### Add a nice animation when the bomb is destroyed
         launched->addTransition(this, SIGNAL(bombExploded()),final);

         //If the animation is finished, then we move to the final state
         launched->addTransition(launched, SIGNAL(animationFinished()), final);

         //The machine has finished to be executed, then the boat is dead
         connect(machine,SIGNAL(finished()),this, SIGNAL(bombExecutionFinished()));

         machine->start();

     }

     void Bomb::onAnimationLaunchValueChanged(const QVariant &)
     {
         foreach (QGraphicsItem * item , collidingItems(Qt::IntersectsItemBoundingRect)) {
             if (item->type() == SubMarine::Type) {
                 SubMarine *s = static_cast<SubMarine *>(item);
                 destroy();
                 s->destroy();
             }
         }
     }

     void Bomb::destroy()
     {
         emit bombExploded();
     }