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<h1 class="title">torpedo.cpp Example File</h1>
<span class="small-subtitle">demos/sub-attaq/torpedo.cpp</span>
<!-- $$$demos/sub-attaq/torpedo.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** information use the contact form at http://www.qt.io/contact-us.
**
** 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, 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
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****************************************************************************/</span>
<span class="comment">//Own</span>
<span class="preprocessor">#include "torpedo.h"</span>
<span class="preprocessor">#include "pixmapitem.h"</span>
<span class="preprocessor">#include "boat.h"</span>
<span class="preprocessor">#include "graphicsscene.h"</span>
<span class="preprocessor">#include "animationmanager.h"</span>
<span class="preprocessor">#include "qanimationstate.h"</span>
<span class="preprocessor">#include <QtCore/QPropertyAnimation></span>
<span class="preprocessor">#include <QtCore/QStateMachine></span>
<span class="preprocessor">#include <QtCore/QFinalState></span>
Torpedo<span class="operator">::</span>Torpedo() : PixmapItem(<span class="type"><a href="qstring.html">QString</a></span><span class="operator">::</span>fromLatin1(<span class="string">"torpedo"</span>)<span class="operator">,</span>GraphicsScene<span class="operator">::</span>Big)<span class="operator">,</span>
currentSpeed(<span class="number">0</span>)
{
setZValue(<span class="number">2</span>);
}
<span class="type">void</span> Torpedo<span class="operator">::</span>launch()
{
<span class="type"><a href="qpropertyanimation.html">QPropertyAnimation</a></span> <span class="operator">*</span>launchAnimation <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="qpropertyanimation.html">QPropertyAnimation</a></span>(<span class="keyword">this</span><span class="operator">,</span> <span class="string">"pos"</span>);
AnimationManager<span class="operator">::</span>self()<span class="operator">-</span><span class="operator">></span>registerAnimation(launchAnimation);
launchAnimation<span class="operator">-</span><span class="operator">></span>setEndValue(<span class="type"><a href="qpointf.html">QPointF</a></span>(x()<span class="operator">,</span>qobject_cast<span class="operator"><</span>GraphicsScene <span class="operator">*</span><span class="operator">></span>(scene())<span class="operator">-</span><span class="operator">></span>sealLevel() <span class="operator">-</span> <span class="number">15</span>));
launchAnimation<span class="operator">-</span><span class="operator">></span>setEasingCurve(<span class="type"><a href="qeasingcurve.html">QEasingCurve</a></span><span class="operator">::</span>InQuad);
launchAnimation<span class="operator">-</span><span class="operator">></span>setDuration(y()<span class="operator">/</span>currentSpeed<span class="operator">*</span><span class="number">10</span>);
connect(launchAnimation<span class="operator">,</span>SIGNAL(valueChanged(<span class="type"><a href="qvariant.html">QVariant</a></span>))<span class="operator">,</span><span class="keyword">this</span><span class="operator">,</span>SLOT(onAnimationLaunchValueChanged(<span class="type"><a href="qvariant.html">QVariant</a></span>)));
connect(<span class="keyword">this</span><span class="operator">,</span>SIGNAL(torpedoExploded())<span class="operator">,</span> launchAnimation<span class="operator">,</span> SLOT(stop()));
<span class="comment">//We setup the state machine of the torpedo</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 launch animation is playing</span>
<span class="type">QAnimationState</span> <span class="operator">*</span>launched <span class="operator">=</span> <span class="keyword">new</span> <span class="type">QAnimationState</span>(machine);
launched<span class="operator">-</span><span class="operator">></span>setAnimation(launchAnimation);
<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);
machine<span class="operator">-</span><span class="operator">></span>setInitialState(launched);
<span class="comment">//### Add a nice animation when the torpedo is destroyed</span>
launched<span class="operator">-</span><span class="operator">></span>addTransition(<span class="keyword">this</span><span class="operator">,</span> SIGNAL(torpedoExploded())<span class="operator">,</span>final);
<span class="comment">//If the animation is finished, then we move to the final state</span>
launched<span class="operator">-</span><span class="operator">></span>addTransition(launched<span class="operator">,</span> SIGNAL(animationFinished())<span class="operator">,</span> final);
<span class="comment">//The machine has finished to be executed, then the boat 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(torpedoExecutionFinished()));
machine<span class="operator">-</span><span class="operator">></span>start();
}
<span class="type">void</span> Torpedo<span class="operator">::</span>setCurrentSpeed(<span class="type">int</span> speed)
{
<span class="keyword">if</span> (speed <span class="operator"><</span> <span class="number">0</span>) {
<a href="qtglobal.html#qWarning">qWarning</a>(<span class="string">"Torpedo::setCurrentSpeed : The speed is invalid"</span>);
<span class="keyword">return</span>;
}
currentSpeed <span class="operator">=</span> speed;
}
<span class="type">void</span> Torpedo<span class="operator">::</span>onAnimationLaunchValueChanged(<span class="keyword">const</span> <span class="type"><a href="qvariant.html">QVariant</a></span> <span class="operator">&</span>)
{
foreach (<span class="type"><a href="qgraphicsitem.html">QGraphicsItem</a></span> <span class="operator">*</span>item <span class="operator">,</span> collidingItems(<span class="type"><a href="qt.html">Qt</a></span><span class="operator">::</span>IntersectsItemBoundingRect)) {
<span class="keyword">if</span> (Boat <span class="operator">*</span>b <span class="operator">=</span> qgraphicsitem_cast<span class="operator"><</span>Boat<span class="operator">*</span><span class="operator">></span>(item))
b<span class="operator">-</span><span class="operator">></span>destroy();
}
}
<span class="type">void</span> Torpedo<span class="operator">::</span>destroy()
{
<span class="keyword">emit</span> torpedoExploded();
}</pre>
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<!-- @@@demos/sub-attaq/torpedo.cpp -->
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