Qt 4.6: torpedo.cpp Example File (demos/sub-attaq/torpedo.cpp)

|  | Home · All Classes · Overviews |

# torpedo.cpp Example File
demos/sub-attaq/torpedo.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the QtCore module of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
     ** No Commercial Usage
     ** This file contains pre-release code and may not be distributed.
     ** You may use this file in accordance with the terms and conditions
     ** contained in the Technology Preview License Agreement accompanying
     ** this package.
     **
     ** 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 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.LGPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU Lesser General Public License version 2.1 requirements
     ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
     **
     ** In addition, as a special exception, Nokia gives you certain
     ** additional rights.  These rights are described in the Nokia Qt LGPL
     ** Exception version 1.1, included in the file LGPL_EXCEPTION.txt in this
     ** package.
     **
     ** If you have questions regarding the use of this file, please contact
     ** Nokia at qt-info@nokia.com.
     **
     **
     **
     **
     **
     **
     **
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     //Own
     #include "torpedo.h"
     #include "pixmapitem.h"
     #include "boat.h"
     #include "graphicsscene.h"
     #include "animationmanager.h"
     #include "qanimationstate.h"

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

     Torpedo::Torpedo(QGraphicsItem * parent, Qt::WindowFlags wFlags)
         : QGraphicsWidget(parent,wFlags), currentSpeed(0), launchAnimation(0)
     {
         pixmapItem = new PixmapItem(QString::fromLatin1("torpedo"),GraphicsScene::Big, this);
         setZValue(2);
         setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Fixed);
         setFlags(QGraphicsItem::ItemIsMovable);
         resize(pixmapItem->boundingRect().size());
     }

     void Torpedo::launch()
     {
         launchAnimation = new QPropertyAnimation(this, "pos");
         AnimationManager::self()->registerAnimation(launchAnimation);
         launchAnimation->setEndValue(QPointF(x(),qobject_cast<GraphicsScene *>(scene())->sealLevel() - 15));
         launchAnimation->setEasingCurve(QEasingCurve::InQuad);
         launchAnimation->setDuration(y()/currentSpeed*10);
         connect(launchAnimation,SIGNAL(valueChanged(const QVariant &)),this,SLOT(onAnimationLaunchValueChanged(const QVariant &)));

         //We setup the state machine of the torpedo
         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 torpedo is destroyed
         launched->addTransition(this, SIGNAL(torpedoExplosed()),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(torpedoExecutionFinished()));

         machine->start();
     }

     void Torpedo::setCurrentSpeed(int speed)
     {
         if (speed < 0) {
             qWarning("Torpedo::setCurrentSpeed : The speed is invalid");
             return;
         }
         currentSpeed = speed;
     }

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

     void Torpedo::destroy()
     {
         launchAnimation->stop();
         emit torpedoExplosed();
     }