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<h1 class="title">torpedo.cpp Example File</h1>
<span class="subtitle">animation/sub-attaq/torpedo.cpp</span>
<!-- $$$animation/sub-attaq/torpedo.cpp-description -->
<div class="descr"> <a name="details"></a>
<pre class="cpp">

  <span class="comment">/****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the QtCore module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
  ** 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 https://www.qt.io/terms-conditions. For further
  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, you may use this file under the terms of the BSD license
  ** as follows:
  **
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  ** modification, are permitted provided that the following conditions are
  ** met:
  **   * Redistributions of source code must retain the above copyright
  **     notice, this list of conditions and the following disclaimer.
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  ** $QT_END_LICENSE$
  **
  ****************************************************************************/</span>

  <span class="comment">//Own</span>
  <span class="preprocessor">#include &quot;torpedo.h&quot;</span>
  <span class="preprocessor">#include &quot;pixmapitem.h&quot;</span>
  <span class="preprocessor">#include &quot;boat.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>

  Torpedo<span class="operator">::</span>Torpedo() : PixmapItem(<span class="type"><a href="../qtcore/qstring.html">QString</a></span><span class="operator">::</span>fromLatin1(<span class="string">&quot;torpedo&quot;</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="../qtcore/qpropertyanimation.html">QPropertyAnimation</a></span> <span class="operator">*</span>launchAnimation <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/qpropertyanimation.html">QPropertyAnimation</a></span>(<span class="keyword">this</span><span class="operator">,</span> <span class="string">&quot;pos&quot;</span>);
      AnimationManager<span class="operator">::</span>self()<span class="operator">-</span><span class="operator">&gt;</span>registerAnimation(launchAnimation);
      launchAnimation<span class="operator">-</span><span class="operator">&gt;</span>setEndValue(<span class="type"><a href="../qtcore/qpointf.html">QPointF</a></span>(x()<span class="operator">,</span>qobject_cast<span class="operator">&lt;</span>GraphicsScene <span class="operator">*</span><span class="operator">&gt;</span>(scene())<span class="operator">-</span><span class="operator">&gt;</span>sealLevel() <span class="operator">-</span> <span class="number">15</span>));
      launchAnimation<span class="operator">-</span><span class="operator">&gt;</span>setEasingCurve(<span class="type"><a href="../qtcore/qeasingcurve.html">QEasingCurve</a></span><span class="operator">::</span>InQuad);
      launchAnimation<span class="operator">-</span><span class="operator">&gt;</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="../qtcore/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="../qtcore/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="../qtcore/qstatemachine.html">QStateMachine</a></span> <span class="operator">*</span>machine <span class="operator">=</span> <span class="keyword">new</span> <span class="type"><a href="../qtcore/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">&gt;</span>setAnimation(launchAnimation);

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

      machine<span class="operator">-</span><span class="operator">&gt;</span>setInitialState(launched);

      <span class="comment">//### Add a nice animation when the torpedo is destroyed</span>
      launched<span class="operator">-</span><span class="operator">&gt;</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">&gt;</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">&gt;</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">&lt;</span> <span class="number">0</span>) {
          <a href="../qtcore/qtglobal.html#qWarning">qWarning</a>(<span class="string">&quot;Torpedo::setCurrentSpeed : The speed is invalid&quot;</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="../qtcore/qvariant.html">QVariant</a></span> <span class="operator">&amp;</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="../qtcore/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">&lt;</span>Boat<span class="operator">*</span><span class="operator">&gt;</span>(item))
              b<span class="operator">-</span><span class="operator">&gt;</span>destroy();
      }
  }

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

</pre>
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<!-- @@@animation/sub-attaq/torpedo.cpp -->
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