FairGeoPgon.cxx

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//*-- AUTHOR : Ilse Koenig
//*-- Modified : 11/11/2003 by Ilse Koenig
//*-- Modified : 26/11/2001 by Ilse Koenig

//
// FairGeoPgon
//
// class for the GEANT shape PGON
//
// The size of a PGON is defined by a variable number of 'points'.
//   point 0:   number of planes perpendicular to the z axis where the
//              dimension of the section is given;
//   point 1:   azimutal angle phi at which the volume begins,
//              opening angle dphi of the volume,
//              number of sides of the cross section between the phi-limits;
//   point 2ff: z coordinate of the section,
//              inner radius at position z,
//              outer radius at position z;
//
// The intrinsic coordinate system of a PGON, which sits in the CAVE and is
// not rotated, is identical with the laboratory system.
//

#include "FairGeoPgon.h"

#include "FairGeoVolume.h"
#include "FairGeoVector.h"

#include "TArrayD.h"

ClassImp(FairGeoPgon)

FairGeoPgon::FairGeoPgon()
  :FairGeoBasicShape()
{
  // constructor
  fName="PGON";
  nPoints=0;
  nParam=0;
}


FairGeoPgon::~FairGeoPgon()
{
  // default destructor
  if (param) {
    delete param;
    param=0;
  }
  if (center) {
    delete center;
    center=0;
  }
  if (position) {
    delete position;
    position=0;
  }
}


Int_t FairGeoPgon::readPoints(std::fstream* pFile,FairGeoVolume* volu)
{
  // reads the 'points' decribed above from ascii file and stores them in the
  // array 'points' of the volume
  // returns the number of points
  if (!pFile) { return 0; }
  Double_t x,y,z;
  const Int_t maxbuf=155;
  Text_t buf[maxbuf];
  pFile->getline(buf,maxbuf);
  Int_t n;
  sscanf(buf,"%i",&n);
  if (n<=0) { return 0; }
  nPoints=n+2;
  if (volu->getNumPoints()!=nPoints) { volu->createPoints(nPoints); }
  volu->setPoint(0,(Double_t)n,0.0,0.0);
  for(Int_t i=1; i<nPoints; i++) {
    pFile->getline(buf,maxbuf);
    sscanf(buf,"%lf%lf%lf",&x,&y,&z);
    volu->setPoint(i,x,y,z);
  }
  return nPoints;
}


Bool_t FairGeoPgon::writePoints(std::fstream* pFile,FairGeoVolume* volu)
{
  // writes the 'points' decribed above to ascii file
  if (!pFile) { return kFALSE; }
  Text_t buf[155];
  for(Int_t i=0; i<volu->getNumPoints(); i++) {
    FairGeoVector& v=*(volu->getPoint(i));
    if (i!=0) { sprintf(buf,"%9.3f%10.3f%10.3f\n",v(0),v(1),v(2)); }
    else { sprintf(buf,"%3i\n",(Int_t)v(0)); }
    pFile->write(buf,strlen(buf));
  }
  return kTRUE;
}


void FairGeoPgon::printPoints(FairGeoVolume* volu)
{
  // prints volume points to screen
  for(Int_t i=0; i<volu->getNumPoints(); i++) {
    FairGeoVector& v=*(volu->getPoint(i));
    if (i!=0) { printf("%9.3f%10.3f%10.3f\n",v(0),v(1),v(2)); }
    else { printf("%3i\n",(Int_t)v(0)); }
  }
}


TArrayD* FairGeoPgon::calcVoluParam(FairGeoVolume* volu)
{
  // calculates the parameters needed to create the shape PGON
  Double_t fac=10.;
  nPoints=volu->getNumPoints();
  nParam=nPoints*3-2;
  if (param && param->GetSize()!=nParam) {
    delete param;
    param=0;
  }
  if (!param) { param=new TArrayD(nParam); }
  FairGeoVector& v1=*(volu->getPoint(1));
  Int_t k=0;
  param->AddAt(v1(0),k++);
  param->AddAt(v1(1),k++);
  param->AddAt(v1(2),k++);
  param->AddAt((nPoints-2),k++);
  for(Int_t i=2; i<nPoints; i++) {
    FairGeoVector& v=*(volu->getPoint(i));
    param->AddAt(v(0)/fac,k++);
    param->AddAt(v(1)/fac,k++);
    param->AddAt(v(2)/fac,k++);
  }
  return param;
}


void FairGeoPgon::calcVoluPosition(FairGeoVolume*,
                                   const FairGeoTransform& dTC,const FairGeoTransform& mTR)
{
  // calls the function posInMother(...) to calculate the position of the
  // volume in its mother
  center->clear();
  posInMother(dTC,mTR);
}