#ifndef TFndDisplay_H
#define TFndDisplay_H

///////////////////////////////////////////////////////////////////////////
//                                                                       //
//    TFndDisplay                                                        //
//                                                                       //
//    Utility class for the FINUDA  Event display (Hits & Tracks)        //
//                                                                       //
///////////////////////////////////////////////////////////////////////////

#ifndef ROOT_TObject
#include <TObject.h>
#endif

class TCanvas;
class TPad;
class TList;
class TSlider;
class TButton;
class TArc;
class TGeometry;
class TFile;
class TFndHdt;

const Int_t kMAXZOOMS = 20;

class TFndDisplay : public TObject {

 private:

  Int_t       fZoomMode;                // = 1 if in zoom mode
  Bool_t      fDrawAllViews;            // True if AllViews selected
  Bool_t      fDrawTracks;              // True if tracks are drawn
  Bool_t      fDrawHits;                // True if hits are drawn
  Float_t     fPTcut;                   // PT cut to select drawn objects
  Float_t     fTheta;                   // viewing angle
  Float_t     fPhi;                     // viewing angle
  Float_t     fPsi;                     // viewing angle
  Float_t     fRrange;                  // view size along Radius
  Float_t     fZrange;                  // view size along beam direction
  Float_t     fZoomX0[kMAXZOOMS];       // Low  x-range for i-th zoom
  Float_t     fZoomX1[kMAXZOOMS];       // High x-range for i-th zoom
  Float_t     fZoomY0[kMAXZOOMS];       // Low  y-range for i-th zoom
  Float_t     fZoomY1[kMAXZOOMS];       // High y-range for i-th zoom
  Int_t       fZooms;                   // Zooming order
  Int_t       fHitsCuts;                // Number of hits surviving cuts
  TCanvas    *fCanvas;                  // pointer to display canvas
  TPad       *fTrigPad;                 // pointer to trigger pad;
  TPad       *fMomPad;                  // pointer to momentum cut pad
  TPad       *fEtaPad;                  // pointer to rapidity cut pad
  TPad       *fButtons;                 // pointer to buttons pad
  TPad       *fPad;                     // pointer to event display main pad
  /*
  TSlider    *fMomSlider;               // pointer to momentum cut slider
  TSlider    *fEtaSlider;               // pointer to rapidity cut slider
  */
  TSlider    *fRangeSlider;             // pointer to Range slider
  TButton    *fPickButton;              // button to activate "pick" mode
  TButton    *fZoomButton;              // button to activate "zoom" mode
  TArc       *fArcButton;               // Green/Red button to show pick/zoom mode
  TList     *fFruits;                  // List of fruits
  TGeometry  *fnd_geom;                 // FINUDA Mther Volume
  Char_t     *fHDT;                     // Hdt input file name
  TFile      *fHdtFile;                 // Hdt input file
  TFndHdt    *fev;                      // Hdt Event

 public:

                    TFndDisplay();            
		    TFndDisplay(Int_t size,Char_t *fHDT = "$FND_DATA/HDT/onl.hdt");
  virtual          ~TFndDisplay();
  virtual Bool_t    AllViews() { return fDrawAllViews; }
  virtual void      Clear(Option_t *option="");
  virtual void      DisableDetector(const char *name);
  virtual void      DisplayButtons();
  virtual Int_t     DistanceToPrimitive(Int_t px, Int_t py);
  virtual void      Draw(Option_t *option="");
  virtual void      DrawAllViews();
  virtual void      DrawHits();
  virtual void      DrawTitle(Option_t *option=""); 
  virtual void      DrawView(Float_t theta, Float_t phi, Float_t psi);
  virtual void      DrawViewGL();
  virtual void      DrawViewX3D();
  virtual void      EnableDetector(const char *name);
  /*
  TSlider          *EtaSlider() { return fEtaSlider; }
  TSlider          *MomSlider() { return fMomSlider; }
  */
  virtual void      ExecuteEvent(Int_t event, Int_t px, Int_t py);
  Int_t             GetZoomMode() { return fZoomMode; }
  virtual void      LoadPoints();
  TPad             *Pad() { return fPad; }
  virtual void      Paint(Option_t *option="");
  Float_t           PTCut() { return fPTcut; }
  virtual void      SetDrawHits(Bool_t draw=kTRUE) { fDrawHits = draw; }
  virtual void      SetDrawTracks(Bool_t draw=kTRUE) { fDrawTracks = draw; }
  virtual void      SetPTcut(Float_t ptcut = 1.5);
  virtual void      SetRange(Float_t rrange = 150., Float_t zrange = 150.);
  virtual void      SetView(Float_t theta, Float_t phi, Float_t psi);
  virtual void      SetPickMode();
  virtual void      SetZoomMode();
  virtual void      ShowNextEvent(Int_t delta = 1);
  virtual void      UnZoom();

  ClassDef(TFndDisplay,0)  //  Utility class for the FINUDA  Event display (Hits & Tracks)

};

#endif