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diff --git a/demos/sub-attaq/torpedo.cpp b/demos/sub-attaq/torpedo.cpp
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+++ b/demos/sub-attaq/torpedo.cpp
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+/****************************************************************************
+**
+** 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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at http://www.qtsoftware.com/contact.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//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();
+}