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4.2.3.1 Minimal Base Code

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 LoadMap() function. This results in the following for ‘simpmap.h’:

 
#ifndef __SIMPMAP_H__
#define __SIMPMAP_H__

#include <crystalspace.h>

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

public:
  Simple ();
  ~Simple ();

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

  CS_EVENTHANDLER_NAMES("application.simpmap")
  CS_EVENTHANDLER_NIL_CONSTRAINTS
};

#endif // __SIMPMAP_H__

Similarly, for ‘simpmap.cpp’:

 
#include "simpmap.h"

CS_IMPLEMENT_APPLICATION

Simple::Simple ()
{
  SetApplicationName ("CrystalSpace.SimpleMap");
}

Simple::~Simple ()
{
}

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

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

  if (kbd->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->GetKeyState (CSKEY_RIGHT))
      obj_move = CS_VEC_RIGHT * 3.0f;
    if (kbd->GetKeyState (CSKEY_LEFT))
      obj_move = CS_VEC_LEFT * 3.0f;
    if (kbd->GetKeyState (CSKEY_UP))
      obj_move = CS_VEC_UP * 3.0f;
    if (kbd->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->GetKeyState (CSKEY_RIGHT))
      obj_rotate.Set (0, 1, 0);
    if (kbd->GetKeyState (CSKEY_LEFT))
      obj_rotate.Set (0, -1, 0);
    if (kbd->GetKeyState (CSKEY_PGUP))
      obj_rotate.Set (1, 0, 0);
    if (kbd->GetKeyState (CSKEY_PGDN))
      obj_rotate.Set (-1, 0, 0);
    if (kbd->GetKeyState (CSKEY_UP))
      obj_move = CS_VEC_FORWARD * 3.0f;
    if (kbd->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->BeginDraw (engine->GetBeginDrawFlags () | CSDRAW_3DGRAPHICS))
    return;

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

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

bool Simple::OnKeyboard(iEvent& ev)
{
  csKeyEventType eventtype = csKeyEventHelper::GetEventType(&ev);
  if (eventtype == csKeyEventTypeDown)
  {
    utf32_char code = csKeyEventHelper::GetCookedCode(&ev);
    if (code == CSKEY_ESC)
    {
      csRef<iEventQueue> q = 
        csQueryRegistry<iEventQueue> (GetObjectRegistry());
      if (q.IsValid()) 
	q->GetEventOutlet()->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("crystalspace.collisiondetection.opcode",
		iCollideSystem),
    CS_REQUEST_END))
    return ReportError("Failed to initialize plugins!");

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

  return true;
}

void Simple::OnExit()
{
}

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

  g3d = csQueryRegistry<iGraphics3D> (GetObjectRegistry());
  if (!g3d) return ReportError("Failed to locate 3D renderer!");

  engine = csQueryRegistry<iEngine> (GetObjectRegistry());
  if (!engine) return ReportError("Failed to locate 3D engine!");

  vc = csQueryRegistry<iVirtualClock> (GetObjectRegistry());
  if (!vc) return ReportError("Failed to locate Virtual Clock!");

  kbd = csQueryRegistry<iKeyboardDriver> (GetObjectRegistry());
  if (!kbd) return ReportError("Failed to locate Keyboard Driver!");

  loader = csQueryRegistry<iLoader> (GetObjectRegistry());
  if (!loader) return ReportError("Failed to locate Loader!");

  cdsys = csQueryRegistry<iCollideSystem> (GetObjectRegistry());
  if (!cdsys) return ReportError ("Failed to locate CD system!");

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

  Run();

  return true;
}

/*---------------*
 * Main function
 *---------------*/
int main (int argc, char* argv[])
{
  return csApplicationRunner<Simple>::Run (argc, argv);
}

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