// @(#)root/geom:$Name:  $:$Id: TGeoXtru.h,v 1.3 2004/03/15 12:11:51 brun Exp $
// Author: Mihaela Gheata   24/01/04

/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/

#ifndef ROOT_TGeoXtru
#define ROOT_TGeoXtru

#ifndef ROOT_TGeoBBox
#include "TGeoBBox.h"
#endif

  
/*************************************************************************
 * TGeoXtru - An extrusion with fixed outline shape in x-y and a sequence
 * of z extents (segments).  The overall scale of the outline scales
 * linearly between z points and the center can have an x-y offset.
 *
 * Based on the initial implementation of R. Hatcher
 *************************************************************************/

class TGeoPolygon;

class TGeoXtru : public TGeoBBox
{
protected:
   // data members
   Int_t                 fNvert; // number of vertices of the 2D polygon (at least 3)
   Int_t                 fNz;    // number of z planes (at least two)
   Double_t              fZcurrent; // current Z position
   TGeoPolygon          *fPoly;  // polygon defining section shape
   Double_t             *fX;     //[fNvert] X positions for polygon vertices
   Double_t             *fY;     //[fNvert] Y positions for polygon vertices
   Double_t             *fXc;    //[fNvert] current X positions for polygon vertices
   Double_t             *fYc;    //[fNvert] current Y positions for polygon vertices
   Double_t             *fZ;     //[fNz] array of Z planes positions 
   Double_t             *fScale; //[fNz] array of scale factors (for each Z)
   Double_t             *fX0;    //[fNz] array of X offsets (for each Z)
   Double_t             *fY0;    //[fNz] array of Y offsets (for each Z)

   Double_t              DistToPlane(Double_t *point, Double_t *dir, Int_t iz, Int_t ivert, Double_t stepmax) const;
   void                  GetPlaneVertices(Int_t iz, Int_t ivert, Double_t *vert) const;
   void                  GetPlaneNormal(const Double_t *vert, Double_t *norm) const;
   Bool_t                IsPointInsidePlane(Double_t *point, Double_t *vert, Double_t *norm) const;
public:
   // constructors
   TGeoXtru();
   TGeoXtru(Int_t nz);
   TGeoXtru(Double_t *param);
   // destructor
   virtual ~TGeoXtru();
   // methods
   virtual void          ComputeBBox();
   virtual void          ComputeNormal(Double_t *point, Double_t *dir, Double_t *norm);
   virtual Bool_t        Contains(Double_t *point) const;
   Bool_t                DefinePolygon(Int_t nvert, const Double_t *xv, const Double_t *yv);
   virtual void          DefineSection(Int_t snum, Double_t z, Double_t x0=0., Double_t y0=0., Double_t scale=1.);
   virtual Double_t      DistToOut(Double_t *point, Double_t *dir, Int_t iact=1, 
                                   Double_t step=TGeoShape::Big(), Double_t *safe=0) const;
   virtual Double_t      DistToIn(Double_t *point, Double_t *dir, Int_t iact=1, 
                                   Double_t step=TGeoShape::Big(), Double_t *safe=0) const;
   virtual Int_t         DistancetoPrimitive(Int_t px, Int_t py);
//   virtual Int_t         GetByteCount() const {return 60+12*fNz;}
   Int_t                 GetNz() const    {return fNz;}
   Int_t                 GetNvert() const {return fNvert;}
   Double_t             *GetZ() const     {return fZ;}
   Double_t              GetZ(Int_t ipl) const;
   virtual TGeoShape    *GetMakeRuntimeShape(TGeoShape * /*mother*/, TGeoMatrix * /*mat*/) const {return 0;}
   virtual void          InspectShape() const;
   virtual void         *Make3DBuffer(const TGeoVolume *vol) const;
   virtual void          Paint(Option_t *option);
   virtual void          PaintNext(TGeoHMatrix *glmat, Option_t *option);
   Double_t             &Z(Int_t ipl) {return fZ[ipl];}
   virtual Double_t      Safety(Double_t *point, Bool_t in=kTRUE) const;
   void                  SetCurrentZ(Double_t z, Int_t iz);
   void                  SetCurrentVertices(Double_t x0, Double_t y0, Double_t scale);
   virtual void          SetDimensions(Double_t *param);
   virtual void          SetPoints(Double_t *buff) const;
   virtual void          SetPoints(Float_t *buff) const;
   virtual void          Sizeof3D() const;

  ClassDef(TGeoXtru, 1)         // extruded polygon class 
};

#endif
