#ifndef ALISEGMENTATION_H
#define ALISEGMENTATION_H
/* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
 * See cxx source for full Copyright notice                               */

/* $Id$ */

#include "TObject.h"

class TF1;

//----------------------------------------------
//
// Chamber segmentation virtual base class
//
class AliSegmentation :
public TObject {
 public:
    // Set Chamber Segmentation Parameters
    //
    virtual ~AliSegmentation() {}
    // Pad size Dx*Dy 
    virtual void    SetPadSize(Float_t p1, Float_t p2)                                 = 0;
    // Anod Pitch
    virtual void    SetDAnod(Float_t D)                                                = 0;
    // Transform from pad (wire) to real coordinates and vice versa
    //
    // Anod wire coordinate closest to xhit
    virtual Float_t GetAnod(Float_t xhit) const                                        = 0;
    // Transform from pad to real coordinates
    virtual void    GetPadI(Float_t x, Float_t y, Float_t  z, Int_t   &ix, Int_t  &iy) = 0;
    // Transform from real to pad coordinatesi
    virtual void    GetPadC(Int_t  ix, Int_t  iy, Float_t &x, Float_t  &y, Float_t &z) = 0;
    //
    // Initialisation
    virtual void Init(Int_t chamber)                                                   = 0;
    //
    // Get member data
    //
    // Pad size in x
    virtual Float_t Dpx() const                                                         = 0;
    // Pad size in y 
    virtual Float_t Dpy() const                                                         = 0;
    // Pad size in x by Sector 
    virtual Float_t Dpx(Int_t) const                                                    = 0;
    // Pad size in y by Sector 
    virtual Float_t Dpy(Int_t) const                                                    = 0;
    // Maximum number of Pads in x
    virtual Int_t    Npx() const                                                        = 0;
    // Maximum number of Pads in y
    virtual Int_t    Npy() const                                                        = 0;
    // Set pad position
    virtual void     SetPad(Int_t, Int_t)                                               = 0;
    // Set hit position
    virtual void     SetHit(Float_t, Float_t, Float_t )                                 = 0;
    
    //
    // Iterate over pads
    // Initialiser
    virtual void  FirstPad(Float_t xhit, Float_t yhit, Float_t zhit, Float_t dx, Float_t dy)   = 0;
    // Stepper
    virtual void  NextPad()                                                             = 0;
    // Condition
    virtual Int_t MorePads()                                                            = 0;
    //
    // Distance between 1 pad and a position
    virtual Float_t Distance2AndOffset(Int_t iX, Int_t iY, Float_t X, Float_t Y, Int_t *dummy) = 0;
    // Number of pads read in parallel and offset to add to x 
    // (specific to LYON, but mandatory for display)
    virtual void GetNParallelAndOffset(Int_t iX, Int_t iY,
				       Int_t *Nparallel, Int_t *Offset)                 = 0;
    // Get next neighbours 
    virtual void Neighbours
	(Int_t iX, Int_t iY, Int_t* Nlist, Int_t Xlist[10], Int_t Ylist[10])            = 0;
    //
    // Current pad cursor during disintegration
    // x-coordinate
    virtual Int_t  Ix()                                                           = 0;
    // y-coordinate
    virtual Int_t  Iy()                                                           = 0;
    // current sector
    virtual Int_t  ISector()                                                      = 0;
    // calculate sector from pad coordinates
    virtual Int_t  Sector(Int_t ix, Int_t iy)                                     = 0;
    virtual Int_t  Sector(Float_t x, Float_t y)                                   = 0;
    //
    // Signal Generation Condition during Stepping
    virtual Int_t SigGenCond(Float_t x, Float_t y, Float_t z)                           = 0;
    // Initialise signal generation at coord (x,y,z)
    virtual void  SigGenInit(Float_t x, Float_t y, Float_t z)                           = 0;
    // Current integration limits 
    virtual void  IntegrationLimits
	(Float_t& x1, Float_t& x2, Float_t& y1, Float_t& y2)                            = 0;
    // Test points for auto calibration
    virtual void GiveTestPoints(Int_t &n, Float_t *x, Float_t *y) const                 = 0;
    // Draw the segmentation zones
    virtual void Draw(const char *opt = "")  const                                  = 0;
    // Function for systematic corrections
    // Set the correction function
    virtual void SetCorrFunc(Int_t,  TF1*)                                               = 0;
    // Get the correction Function
    virtual TF1* CorrFunc(Int_t)  const                                                 = 0;
	    
    ClassDef(AliSegmentation,1) //Segmentation abstract base class 
};
#endif