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4.3.3.1 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<iView> view;
  iSector* room;
  csVector3 pos;
  float rotX, rotY;
 
  bool OnKeyboard (iEvent&);
  void ProcessFrame ();
  void FinishFrame ();
  bool LoadMap ();

public:
  Simple (iObjectRegistry* object_reg);
  ~Simple ();

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

#endif // __SIMPMAP_H__

Similarly, for `simpmap.cpp':

 
#include "simpmap.h"

CS_IMPLEMENT_APPLICATION

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

Simple::~Simple ()
{
}

void Simple::ProcessFrame ()
{
  // First get elapsed time from the virtual clock.
  csTicks elapsed_time = vc->GetElapsedTicks ();
  
  // Now rotate the camera according to keyboard state
  float speed = (elapsed_time / 1000.0) * (0.03 * 20);

  iCamera* c = view->GetCamera();

  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))
      c->Move (CS_VEC_RIGHT * 4 * speed);
    if (kbd->GetKeyState (CSKEY_LEFT))
      c->Move (CS_VEC_LEFT * 4 * speed);
    if (kbd->GetKeyState (CSKEY_UP))
      c->Move (CS_VEC_UP * 4 * speed);
    if (kbd->GetKeyState (CSKEY_DOWN))
      c->Move (CS_VEC_DOWN * 4 * speed);
  }
  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 and up and downarrows cause the camera to
    // go forwards and backwards.
    if (kbd->GetKeyState (CSKEY_RIGHT))
      rotY += speed;
    if (kbd->GetKeyState (CSKEY_LEFT))
      rotY -= speed;
    if (kbd->GetKeyState (CSKEY_PGUP))
      rotX += speed;
    if (kbd->GetKeyState (CSKEY_PGDN))
      rotX -= speed;
    if (kbd->GetKeyState (CSKEY_UP))
      c->Move (CS_VEC_FORWARD * 4 * speed);
    if (kbd->GetKeyState (CSKEY_DOWN))
      c->Move (CS_VEC_BACKWARD * 4 * speed);
  }

  // We now assign a new rotation transformation to the camera.
  csMatrix3 rot = csXRotMatrix3 (rotX) * csYRotMatrix3 (rotY);
  csOrthoTransform ot (rot, c->GetTransform().GetOrigin ());
  c->SetTransform (ot);

  // 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 = 
        CS_QUERY_REGISTRY(GetObjectRegistry(), iEventQueue);
      if (q.IsValid()) q->GetEventOutlet()->Broadcast(cscmdQuit);
    }
  }
  return false;
}

bool Simple::Initialize ()
{
  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_END))
    return ReportError("Failed to initialize plugins!");

  if (!RegisterQueue(GetObjectRegistry()))
    return ReportError("Failed to set up event handler!");

  return true;
}

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

  g3d = CS_QUERY_REGISTRY(GetObjectRegistry(), iGraphics3D);
  if (!g3d) return ReportError("Failed to locate 3D renderer!");

  engine = CS_QUERY_REGISTRY(GetObjectRegistry(), iEngine);
  if (!engine) return ReportError("Failed to locate 3D engine!");

  vc = CS_QUERY_REGISTRY(GetObjectRegistry(), iVirtualClock);
  if (!vc) return ReportError("Failed to locate Virtual Clock!");

  kbd = CS_QUERY_REGISTRY(GetObjectRegistry(), iKeyboardDriver);
  if (!kbd) return ReportError("Failed to locate Keyboard Driver!");

  loader = CS_QUERY_REGISTRY(GetObjectRegistry(), iLoader);
  if (!loader) return ReportError("Failed to locate Loader!");

  view = csPtr<iView> (new csView (engine, g3d));
  iGraphics2D* g2d = g3d->GetDriver2D ();
  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);
}

One important note in the code above: we removed the following line:

 
engine->SetLightingCacheMode (0);

That's 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.

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