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<a name="Simple-Base-Code"></a>
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<h4 class="subsubsection"> 4.2.3.1 Minimal Base Code </h4>

<p>To start, we first take the code of tutorial one
and remove the code that creates geometry and initializes
the default camera position. In addition we add a new <code>LoadMap()</code>
function. This results in the following for <tt>&lsquo;simpmap.h&rsquo;</tt>:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">#ifndef __SIMPMAP_H__
#define __SIMPMAP_H__

#include &lt;crystalspace.h&gt;

class Simple
  : public csApplicationFramework, public csBaseEventHandler
{
private:
  csRef&lt;iEngine&gt; engine;
  csRef&lt;iLoader&gt; loader;
  csRef&lt;iGraphics3D&gt; g3d;
  csRef&lt;iKeyboardDriver&gt; kbd;
  csRef&lt;iVirtualClock&gt; vc;
  csRef&lt;iCollideSystem&gt; cdsys;
  csRef&lt;iView&gt; view;
  iSector* room;
  csColliderActor collider_actor;
 
  bool OnKeyboard (iEvent&amp;);
  void ProcessFrame ();
  void FinishFrame ();
  bool LoadMap ();

public:
  Simple ();
  ~Simple ();

  void OnExit ();
  bool OnInitialize (int argc, char* argv[]);
  bool Application ();

  CS_EVENTHANDLER_NAMES(&quot;application.simpmap&quot;)
  CS_EVENTHANDLER_NIL_CONSTRAINTS
};

#endif // __SIMPMAP_H__
</pre></td></tr></table>
<p>Similarly, for <tt>&lsquo;simpmap.cpp&rsquo;</tt>:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">#include &quot;simpmap.h&quot;

CS_IMPLEMENT_APPLICATION

Simple::Simple ()
{
  SetApplicationName (&quot;CrystalSpace.SimpleMap&quot;);
}

Simple::~Simple ()
{
}

void Simple::ProcessFrame ()
{
  // First get elapsed time from the virtual clock.
  csTicks elapsed_time = vc-&gt;GetElapsedTicks ();

  csVector3 obj_move (0);
  csVector3 obj_rotate (0);

  if (kbd-&gt;GetKeyState (CSKEY_SHIFT))
  {
    // If the user is holding down shift, the arrow keys will cause
    // the camera to strafe up, down, left or right from it's
    // current position.
    if (kbd-&gt;GetKeyState (CSKEY_RIGHT))
      obj_move = CS_VEC_RIGHT * 3.0f;
    if (kbd-&gt;GetKeyState (CSKEY_LEFT))
      obj_move = CS_VEC_LEFT * 3.0f;
    if (kbd-&gt;GetKeyState (CSKEY_UP))
      obj_move = CS_VEC_UP * 3.0f;
    if (kbd-&gt;GetKeyState (CSKEY_DOWN))
      obj_move = CS_VEC_DOWN * 3.0f;
  }
  else
  {
    // left and right cause the camera to rotate on the global Y
    // axis; page up and page down cause the camera to rotate on the
    // _camera's_ X axis (more on this in a second) and up and down
    // arrows cause the camera to go forwards and backwards.
    if (kbd-&gt;GetKeyState (CSKEY_RIGHT))
      obj_rotate.Set (0, 1, 0);
    if (kbd-&gt;GetKeyState (CSKEY_LEFT))
      obj_rotate.Set (0, -1, 0);
    if (kbd-&gt;GetKeyState (CSKEY_PGUP))
      obj_rotate.Set (1, 0, 0);
    if (kbd-&gt;GetKeyState (CSKEY_PGDN))
      obj_rotate.Set (-1, 0, 0);
    if (kbd-&gt;GetKeyState (CSKEY_UP))
      obj_move = CS_VEC_FORWARD * 3.0f;
    if (kbd-&gt;GetKeyState (CSKEY_DOWN))
      obj_move = CS_VEC_BACKWARD * 3.0f;
  }

  collider_actor.Move (float (elapsed_time) / 1000.0f, 1.0f,
    	obj_move, obj_rotate);

  // Tell 3D driver we're going to display 3D things.
  if (!g3d-&gt;BeginDraw (engine-&gt;GetBeginDrawFlags () | CSDRAW_3DGRAPHICS))
    return;

  // Tell the camera to render into the frame buffer.
  view-&gt;Draw ();
}

void Simple::FinishFrame ()
{
  g3d-&gt;FinishDraw ();
  g3d-&gt;Print (0);
}

bool Simple::OnKeyboard(iEvent&amp; ev)
{
  csKeyEventType eventtype = csKeyEventHelper::GetEventType(&amp;ev);
  if (eventtype == csKeyEventTypeDown)
  {
    utf32_char code = csKeyEventHelper::GetCookedCode(&amp;ev);
    if (code == CSKEY_ESC)
    {
      csRef&lt;iEventQueue&gt; q = 
        csQueryRegistry&lt;iEventQueue&gt; (GetObjectRegistry());
      if (q.IsValid()) 
	q-&gt;GetEventOutlet()-&gt;Broadcast(csevQuit (GetObjectRegistry ()));
    }
  }
  return false;
}

bool Simple::OnInitialize(int argc, char* argv[])
{
  if (!csInitializer::RequestPlugins(GetObjectRegistry(),
    CS_REQUEST_VFS,
    CS_REQUEST_OPENGL3D,
    CS_REQUEST_ENGINE,
    CS_REQUEST_FONTSERVER,
    CS_REQUEST_IMAGELOADER,
    CS_REQUEST_LEVELLOADER,
    CS_REQUEST_REPORTER,
    CS_REQUEST_REPORTERLISTENER,
    CS_REQUEST_PLUGIN(&quot;crystalspace.collisiondetection.opcode&quot;,
		iCollideSystem),
    CS_REQUEST_END))
    return ReportError(&quot;Failed to initialize plugins!&quot;);

  csBaseEventHandler::Initialize(GetObjectRegistry());
  if (!RegisterQueue(GetObjectRegistry(), csevAllEvents(GetObjectRegistry())))
    return ReportError(&quot;Failed to set up event handler!&quot;);

  return true;
}

void Simple::OnExit()
{
}

bool Simple::Application()
{
  if (!OpenApplication(GetObjectRegistry()))
    return ReportError(&quot;Error opening system!&quot;);

  g3d = csQueryRegistry&lt;iGraphics3D&gt; (GetObjectRegistry());
  if (!g3d) return ReportError(&quot;Failed to locate 3D renderer!&quot;);

  engine = csQueryRegistry&lt;iEngine&gt; (GetObjectRegistry());
  if (!engine) return ReportError(&quot;Failed to locate 3D engine!&quot;);

  vc = csQueryRegistry&lt;iVirtualClock&gt; (GetObjectRegistry());
  if (!vc) return ReportError(&quot;Failed to locate Virtual Clock!&quot;);

  kbd = csQueryRegistry&lt;iKeyboardDriver&gt; (GetObjectRegistry());
  if (!kbd) return ReportError(&quot;Failed to locate Keyboard Driver!&quot;);

  loader = csQueryRegistry&lt;iLoader&gt; (GetObjectRegistry());
  if (!loader) return ReportError(&quot;Failed to locate Loader!&quot;);

  cdsys = csQueryRegistry&lt;iCollideSystem&gt; (GetObjectRegistry());
  if (!cdsys) return ReportError (&quot;Failed to locate CD system!&quot;);

  view.AttachNew(new csView (engine, g3d));
  iGraphics2D* g2d = g3d-&gt;GetDriver2D ();
  // We use the full window to draw the world.
  view-&gt;SetRectangle (0, 0, g2d-&gt;GetWidth (), g2d-&gt;GetHeight ());

  Run();

  return true;
}

/*---------------*
 * Main function
 *---------------*/
int main (int argc, char* argv[])
{
  return csApplicationRunner&lt;Simple&gt;::Run (argc, argv);
}
</pre></td></tr></table>
<p>One important note in the code above which differs from the earlier tutorials
is that we removed the following line:
</p>
<table><tr><td>&nbsp;</td><td><pre class="example">engine-&gt;SetLightingCacheMode (0);
</pre></td></tr></table>
<p>This is because, when we are loading from map file, we actually want
the lighting information to be read from the cache (if present).
We do so because relighting a map can be a time-consuming process.
</p>
<hr size="1">
<table cellpadding="1" cellspacing="1" border="0">
<tr><td valign="middle" align="left">[<a href="Tutorial-Simple-Map.html#0" title="Previous section in reading order"> &lt; </a>]</td>
<td valign="middle" align="left">[<a href="Simple-Loading-The-Map.html#0" title="Next section in reading order"> &gt; </a>]</td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left">[<a href="Using-Crystal-Space.html#0" title="Beginning of this chapter or previous chapter"> &lt;&lt; </a>]</td>
<td valign="middle" align="left">[<a href="Tutorial-Simple-Map.html#0" title="Up section"> Up </a>]</td>
<td valign="middle" align="left">[<a href="Working-with-Engine-Content.html#0" title="Next chapter"> &gt;&gt; </a>]</td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left"> &nbsp; </td>
<td valign="middle" align="left">[<a href="index.html#SEC_Top" title="Cover (top) of document">Top</a>]</td>
<td valign="middle" align="left">[<a href="cs_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
<td valign="middle" align="left">[<a href="cs_Index.html#0" title="Index">Index</a>]</td>
<td valign="middle" align="left">[<a href="cs_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
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