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();
 }