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diff --git a/demos/sub-attaq/torpedo.cpp b/demos/sub-attaq/torpedo.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** 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() : PixmapItem(QString::fromLatin1("torpedo"),GraphicsScene::Big),
+    currentSpeed(0)
+{
+    setZValue(2);
+}
+
+void Torpedo::launch()
+{
+    QPropertyAnimation *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(QVariant)),this,SLOT(onAnimationLaunchValueChanged(QVariant)));
+    connect(this,SIGNAL(torpedoExploded()), launchAnimation, SLOT(stop()));
+
+    //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(torpedoExploded()),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 (Boat *b = qgraphicsitem_cast<Boat*>(item))
+            b->destroy();
+    }
+}
+
+void Torpedo::destroy()
+{
+    emit torpedoExploded();
+}