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but_track.H

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#ifndef GLUE_BUT_TRACK_H
#define GLUE_BUT_TRACK_H

#include "event/event.H"
#include "dev/dev.H"
#include "dev/room6d.H"
#include "dev/buttons.H"
#include "mlib/points.H"
#include "mlib/math_translate.H"

extern DllImpExp cWtransf &Identity;

class DEVbtn_tracker_agg: public EVENTfilter {
     str_ptr        _hname, _tname, _bname;
     DEVice_room6d *_head;
     DEVice_room6d *_tkr;
     DEVice        *_btn;     // possible real source of button events
     EVENTsource    _btn_src; // cached description of button event source

     bool     button_evt(cEVENTptr &evt) { 
           if (!_btn && !(_btn = DEVice::lookup(_bname)) && evt->debug_on())
          cerr <<"DEVbtn_tracker_agg: can't find button device "
               << _bname << endl;
           return _btn_src.test(*evt->source()) && EVENTbtn::isa(evt); }
     cWtransf &cur_tracker(bool dbg) { 
               if (!_tkr&&!(_tkr=(DEVice_room6d*)DEVice::lookup(_tname))&&dbg)
                  cerr << "DEVbtn_tracker_agg: can't find tracker device "
                   << _tname << endl; 
           return _tkr ? _tkr->cur() : Identity; }
     cWtransf &cur_head(bool dbg) { 
               if(!_head &&!(_head=(DEVice_room6d*)DEVice::lookup(_hname))&&dbg)
              cerr<<"DEVbtn_tracker_agg: can't find head device "
              << _hname << endl; 
           return _head ? _head->cur() : Identity; }
   public:
      DEVbtn_tracker_agg(Cstr_ptr &h, Cstr_ptr &t, Cstr_ptr &b):
                 _hname(h),_tname(t),_bname(b),_head(0),_tkr(0),_btn(0),
         _btn_src(_bname,0)    { }
      virtual ~DEVbtn_tracker_agg()    { }

      EVENTptr filter(cEVENTptr &evt) {
     if (button_evt(evt)) {
        EVENTbtnptr btn = EVENTbtn::cast(evt);
            Wtransf r2w(MathTranslate::instance() ? 
                         MathTranslate::instance()->ROOM_TO_WORLD() : Identity);
            if (!MathTranslate::instance())
               cerr << "DEVbtn_tracker_agg::filter - Warning, no MathTranslate instance is available" << endl;

            // XXX: This isn't really very safe...
            // we need to make static variables out of the head and tracker
            // world matrices because EVENTbtn_vr receives its parameters as 
            // references.   
            static Wtransf world_head_xf;
            static Wtransf world_tkr_xf;
            world_head_xf = r2w * cur_head(evt->debug_on());
            world_tkr_xf  = r2w * cur_tracker(evt->debug_on());
            return new EVENTbtn_vr(btn->source(), 
                   world_head_xf,
                   world_tkr_xf,
                                   btn->transition());
     }
     return evt;
      }
};

#endif

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