/data/refman/pasoursint/CMSSW_4_1_8_patch13/src/DetectorDescription/Core/src/Polycone.cc

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#include "DetectorDescription/Core/src/Polycone.h" 

#include <string>
#include <assert.h>
#include "DetectorDescription/Base/interface/DDdebug.h"

#include "DetectorDescription/Base/interface/DDException.h"
#include "CLHEP/Units/GlobalSystemOfUnits.h"
#include "CLHEP/Units/GlobalPhysicalConstants.h"
#include<cmath>

using DDI::Polycone;



Polycone::Polycone ( double startPhi, double deltaPhi,
              const std::vector<double> & z,
              const std::vector<double> & rmin,
              const std::vector<double> & rmax)
 : Solid(ddpolycone_rrz)              
{
  p_.push_back(startPhi);
  p_.push_back(deltaPhi);
  if((z.size()!=rmin.size()) || (z.size()!=rmax.size()) )
  {
    std::string s=std::string("Polycone(..): std::vectors z,rmin,rmax not of same length");
    throw DDException(s);
  } 
  else
  {
    for(unsigned int i=0;i<z.size(); ++i)
    {
      p_.push_back(z[i]);
      p_.push_back(rmin[i]);
      p_.push_back(rmax[i]);
    }
  }
}             


Polycone::Polycone ( double startPhi, double deltaPhi,
              const std::vector<double> & z,
              const std::vector<double> & r)
 : Solid(ddpolycone_rz)       
{
  p_.push_back(startPhi);
  p_.push_back(deltaPhi);
  if(z.size()!=r.size())
  {
    std::string s=std::string("Polycone(..): std::vectors z,rmin,rmax not of same length");
    throw DDException(s);
  } 
  else
  {
    for(unsigned int i=0;i<z.size(); ++i)
    {
      p_.push_back(z[i]);
      p_.push_back(r[i]);
    }
  }
}            
 
 
double Polycone::volume() const 
{
  double result = -1.;
  if (shape_==ddpolycone_rrz) {
   int loop = (p_.size()-2)/3 -1;
   assert(loop>0);
   double sec=0;
   DCOUT('V',"Polycone::volume(), loop=" << loop);
   int i=2;
   for (int j=2; j<(loop+2); ++j) {
     double dz= std::fabs(p_[i]-p_[i+3]);
      DCOUT('v', "   dz=" << dz/cm << "cm zi=" << p_[i] << " zii=" << p_[i+3] );
      double v_min = dz * pi/3. *(  p_[i+1]*p_[i+1] + p_[i+4]*p_[i+4]
                            + p_[i+1]*p_[i+4] );
      DCOUT('v', "   v_min" << v_min/cm3 << "cm3 rmi=" << p_[i+1]);                 
      double v_max = dz * pi/3. *(  p_[i+2]*p_[i+2] + p_[i+5]*p_[i+5]
                            + p_[i+2]*p_[i+5] );
      DCOUT('v', "   v_max" << v_max/cm3 << "cm3");                 
      double s = v_max - v_min;
      //assert(s>=0);
      sec += s;
      i += 3;                                                                                      
   }  
   result = sec * std::fabs(p_[1])/rad/(2.*pi);
  }
  
  if (shape_==ddpolycone_rz) {
    double volume=0;
    double phiFrom=p_[0]/rad;
    double phiTo=(p_[0]+p_[1])/rad;
    double slice=(std::fabs(phiFrom-phiTo))/(2*pi);
    double zBegin=0;
    double zEnd=0;
    double rBegin=0;
    double rEnd=0;
    double z=0;
    unsigned int i=2;
 
    while(i<(p_.size()-2))
    {
      zBegin=p_[i];
      zEnd=p_[i+2];
      rBegin=p_[i+1];
      rEnd=p_[i+3];
      z=zBegin-zEnd;

     /* for calculation of volume1 look at calculation of DDConsImpl of a volume1. Furthermore z can be smaller than zero. This makes sense since volumes we have to substract */

      double volume1=(rEnd*rEnd+rBegin*rBegin+rBegin*rEnd)*z/3;

      volume=volume+volume1;

      i=i+2;
    }

    /* last line (goes from last z/r value to first */
    i=p_.size()-2;
    zBegin=p_[i];
    zEnd=p_[2];
    rBegin=p_[i+1];
    rEnd=p_[3];
    z=zBegin-zEnd;

    double volume2=(rEnd*rEnd+rBegin*rBegin+rBegin*rEnd)*z/3;


    volume=volume+volume2;
  
    volume=std::fabs(slice*pi*volume);

    result = volume;

  }
  return result;
}