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<h1 class="title">submarine.cpp Example File</h1>
<span class="small-subtitle">demos/sub-attaq/submarine.cpp</span>
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<pre class="cpp"> <span class="comment">/****************************************************************************
 **
 ** Copyright (C) 2012 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.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** GNU Lesser General Public License Usage
 ** 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.
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 ** 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.
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 ** Public License version 3.0 as published by the Free Software Foundation
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 ** conditions contained in a signed written agreement between you and Nokia.
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 ****************************************************************************/</span>

 <span class="comment">//Own</span>
 <span class="preprocessor">#include &quot;submarine.h&quot;</span>
 <span class="preprocessor">#include &quot;submarine_p.h&quot;</span>
 <span class="preprocessor">#include &quot;torpedo.h&quot;</span>
 <span class="preprocessor">#include &quot;pixmapitem.h&quot;</span>
 <span class="preprocessor">#include &quot;graphicsscene.h&quot;</span>
 <span class="preprocessor">#include &quot;animationmanager.h&quot;</span>
 <span class="preprocessor">#include &quot;qanimationstate.h&quot;</span>

 <span class="preprocessor">#include &lt;QtCore/QPropertyAnimation&gt;</span>
 <span class="preprocessor">#include &lt;QtCore/QStateMachine&gt;</span>
 <span class="preprocessor">#include &lt;QtCore/QFinalState&gt;</span>
 <span class="preprocessor">#include &lt;QtCore/QSequentialAnimationGroup&gt;</span>

 <span class="keyword">static</span> <span class="type"><a href="qabstractanimation.html">QAbstractAnimation</a></span> <span class="operator">*</span>setupDestroyAnimation(SubMarine <span class="operator">*</span>sub)
 {
     <span class="type"><a href="qsequentialanimationgroup.html">QSequentialAnimationGroup</a></span> <span class="operator">*</span>group <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qsequentialanimationgroup.html">QSequentialAnimationGroup</a></span>(sub);
     <span class="keyword">for</span> (<span class="type">int</span> i <span class="operator">=</span> <span class="number">1</span>; i <span class="operator">&lt;</span><span class="operator">=</span> <span class="number">4</span>; <span class="operator">+</span><span class="operator">+</span>i) {
         PixmapItem <span class="operator">*</span>step <span class="operator">=</span> <span class="keyword">new</span> PixmapItem(<span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>fromLatin1(<span class="string">&quot;explosion/submarine/step%1&quot;</span>)<span class="operator">.</span>arg(i)<span class="operator">,</span> GraphicsScene<span class="operator">::</span>Big<span class="operator">,</span> sub);
         step<span class="operator">-</span><span class="operator">&gt;</span>setZValue(<span class="number">6</span>);
         step<span class="operator">-</span><span class="operator">&gt;</span>setOpacity(<span class="number">0</span>);
         <span class="type"><a href="qpropertyanimation.html">QPropertyAnimation</a></span> <span class="operator">*</span>anim <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpropertyanimation.html">QPropertyAnimation</a></span>(step<span class="operator">,</span> <span class="string">&quot;opacity&quot;</span><span class="operator">,</span> group);
         anim<span class="operator">-</span><span class="operator">&gt;</span>setDuration(<span class="number">100</span>);
         anim<span class="operator">-</span><span class="operator">&gt;</span>setEndValue(<span class="number">1</span>);
     }
     AnimationManager<span class="operator">::</span>self()<span class="operator">-</span><span class="operator">&gt;</span>registerAnimation(group);
     <span class="keyword">return</span> group;
 }

 SubMarine<span class="operator">::</span>SubMarine(<span class="type">int</span> type<span class="operator">,</span> <span class="keyword">const</span> <span class="type"><a href="qstring.html">QString</a></span> <span class="operator">&amp;</span>name<span class="operator">,</span> <span class="type">int</span> points) : PixmapItem(<span class="type"><a href="qstring.html">QString</a></span>(<span class="string">&quot;submarine&quot;</span>)<span class="operator">,</span> GraphicsScene<span class="operator">::</span>Big)<span class="operator">,</span>
     subType(type)<span class="operator">,</span> subName(name)<span class="operator">,</span> subPoints(points)<span class="operator">,</span> speed(<span class="number">0</span>)<span class="operator">,</span> direction(SubMarine<span class="operator">::</span>None)
 {
     setZValue(<span class="number">5</span>);
     setTransformOriginPoint(boundingRect()<span class="operator">.</span>center());

     graphicsRotation <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qgraphicsrotation.html">QGraphicsRotation</a></span>(<span class="keyword">this</span>);
     graphicsRotation<span class="operator">-</span><span class="operator">&gt;</span>setAxis(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>YAxis);
     graphicsRotation<span class="operator">-</span><span class="operator">&gt;</span>setOrigin(QVector3D(size()<span class="operator">.</span>width()<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> size()<span class="operator">.</span>height()<span class="operator">/</span><span class="number">2</span><span class="operator">,</span> <span class="number">0</span>));
     <span class="type"><a href="qlist.html">QList</a></span><span class="operator">&lt;</span><span class="type"><a href="qgraphicstransform.html">QGraphicsTransform</a></span> <span class="operator">*</span><span class="operator">&gt;</span> r;
     r<span class="operator">.</span>append(graphicsRotation);
     setTransformations(r);

     <span class="comment">//We setup the state machine of the submarine</span>
     <span class="type"><a href="qstatemachine.html">QStateMachine</a></span> <span class="operator">*</span>machine <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qstatemachine.html">QStateMachine</a></span>(<span class="keyword">this</span>);

     <span class="comment">//This state is when the boat is moving/rotating</span>
     <span class="type"><a href="qstate.html">QState</a></span> <span class="operator">*</span>moving <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qstate.html">QState</a></span>(machine);

     <span class="comment">//This state is when the boat is moving from left to right</span>
     MovementState <span class="operator">*</span>movement <span class="operator">=</span> <span class="keyword">new</span> MovementState(<span class="keyword">this</span><span class="operator">,</span> moving);

     <span class="comment">//This state is when the boat is moving from left to right</span>
     ReturnState <span class="operator">*</span>rotation <span class="operator">=</span> <span class="keyword">new</span> ReturnState(<span class="keyword">this</span><span class="operator">,</span> moving);

     <span class="comment">//This is the initial state of the moving root state</span>
     moving<span class="operator">-</span><span class="operator">&gt;</span>setInitialState(movement);

     movement<span class="operator">-</span><span class="operator">&gt;</span>addTransition(<span class="keyword">this</span><span class="operator">,</span> SIGNAL(subMarineStateChanged())<span class="operator">,</span> moving);

     <span class="comment">//This is the initial state of the machine</span>
     machine<span class="operator">-</span><span class="operator">&gt;</span>setInitialState(moving);

     <span class="comment">//End</span>
     <span class="type"><a href="qfinalstate.html">QFinalState</a></span> <span class="operator">*</span>final <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qfinalstate.html">QFinalState</a></span>(machine);

     <span class="comment">//If the moving animation is finished we move to the return state</span>
     movement<span class="operator">-</span><span class="operator">&gt;</span>addTransition(movement<span class="operator">,</span> SIGNAL(animationFinished())<span class="operator">,</span> rotation);

     <span class="comment">//If the return animation is finished we move to the moving state</span>
     rotation<span class="operator">-</span><span class="operator">&gt;</span>addTransition(rotation<span class="operator">,</span> SIGNAL(animationFinished())<span class="operator">,</span> movement);

     <span class="comment">//This state play the destroyed animation</span>
     <span class="type">QAnimationState</span> <span class="operator">*</span>destroyedState <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QAnimationState</span>(machine);
     destroyedState<span class="operator">-</span><span class="operator">&gt;</span>setAnimation(setupDestroyAnimation(<span class="keyword">this</span>));

     <span class="comment">//Play a nice animation when the submarine is destroyed</span>
     moving<span class="operator">-</span><span class="operator">&gt;</span>addTransition(<span class="keyword">this</span><span class="operator">,</span> SIGNAL(subMarineDestroyed())<span class="operator">,</span> destroyedState);

     <span class="comment">//Transition to final state when the destroyed animation is finished</span>
     destroyedState<span class="operator">-</span><span class="operator">&gt;</span>addTransition(destroyedState<span class="operator">,</span> SIGNAL(animationFinished())<span class="operator">,</span> final);

     <span class="comment">//The machine has finished to be executed, then the submarine is dead</span>
     connect(machine<span class="operator">,</span>SIGNAL(finished())<span class="operator">,</span><span class="keyword">this</span><span class="operator">,</span> SIGNAL(subMarineExecutionFinished()));

     machine<span class="operator">-</span><span class="operator">&gt;</span>start();
 }

 <span class="type">int</span> SubMarine<span class="operator">::</span>points() <span class="keyword">const</span>
 {
     <span class="keyword">return</span> subPoints;
 }

 <span class="type">void</span> SubMarine<span class="operator">::</span>setCurrentDirection(SubMarine<span class="operator">::</span>Movement direction)
 {
     <span class="keyword">if</span> (<span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>direction <span class="operator">=</span><span class="operator">=</span> direction)
         <span class="keyword">return</span>;
     <span class="keyword">if</span> (direction <span class="operator">=</span><span class="operator">=</span> SubMarine<span class="operator">::</span>Right <span class="operator">&amp;</span><span class="operator">&amp;</span> <span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>direction <span class="operator">=</span><span class="operator">=</span> SubMarine<span class="operator">::</span>None) {
           graphicsRotation<span class="operator">-</span><span class="operator">&gt;</span>setAngle(<span class="number">180</span>);
     }
     <span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>direction <span class="operator">=</span> direction;
 }

 <span class="keyword">enum</span> SubMarine<span class="operator">::</span>Movement SubMarine<span class="operator">::</span>currentDirection() <span class="keyword">const</span>
 {
     <span class="keyword">return</span> direction;
 }

 <span class="type">void</span> SubMarine<span class="operator">::</span>setCurrentSpeed(<span class="type">int</span> speed)
 {
     <span class="keyword">if</span> (speed <span class="operator">&lt;</span> <span class="number">0</span> <span class="operator">|</span><span class="operator">|</span> speed <span class="operator">&gt;</span> <span class="number">3</span>) {
         <a href="qtglobal.html#qWarning">qWarning</a>(<span class="string">&quot;SubMarine::setCurrentSpeed : The speed is invalid&quot;</span>);
     }
     <span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>speed <span class="operator">=</span> speed;
     <span class="keyword">emit</span> subMarineStateChanged();
 }

 <span class="type">int</span> SubMarine<span class="operator">::</span>currentSpeed() <span class="keyword">const</span>
 {
     <span class="keyword">return</span> speed;
 }

 <span class="type">void</span> SubMarine<span class="operator">::</span>launchTorpedo(<span class="type">int</span> speed)
 {
     Torpedo <span class="operator">*</span> torp <span class="operator">=</span> <span class="keyword">new</span> Torpedo();
     GraphicsScene <span class="operator">*</span>scene <span class="operator">=</span> <span class="keyword">static_cast</span><span class="operator">&lt;</span>GraphicsScene <span class="operator">*</span><span class="operator">&gt;</span>(<span class="keyword">this</span><span class="operator">-</span><span class="operator">&gt;</span>scene());
     scene<span class="operator">-</span><span class="operator">&gt;</span>addItem(torp);
     torp<span class="operator">-</span><span class="operator">&gt;</span>setPos(pos());
     torp<span class="operator">-</span><span class="operator">&gt;</span>setCurrentSpeed(speed);
     torp<span class="operator">-</span><span class="operator">&gt;</span>launch();
 }

 <span class="type">void</span> SubMarine<span class="operator">::</span>destroy()
 {
     <span class="keyword">emit</span> subMarineDestroyed();
 }

 <span class="type">int</span> SubMarine<span class="operator">::</span>type() <span class="keyword">const</span>
 {
     <span class="keyword">return</span> Type;
 }</pre>
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