/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_13_patch3/src/Geometry/TrackerCommonData/plugins/DDTrackerPhiAltAlgo.cc

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// File: DDTrackerPhiAltAlgo.cc
// Description: Position n copies inside and outside at alternate phi values

#include <cmath>
#include <algorithm>

#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "DetectorDescription/Base/interface/DDutils.h"
#include "DetectorDescription/Core/interface/DDCurrentNamespace.h"
#include "DetectorDescription/Core/interface/DDSplit.h"
#include "Geometry/TrackerCommonData/plugins/DDTrackerPhiAltAlgo.h"
#include "CLHEP/Units/GlobalPhysicalConstants.h"
#include "CLHEP/Units/GlobalSystemOfUnits.h"


DDTrackerPhiAltAlgo::DDTrackerPhiAltAlgo() {
  LogDebug("TrackerGeom") << "DDTrackerPhiAltAlgo info: Creating an instance";
}

DDTrackerPhiAltAlgo::~DDTrackerPhiAltAlgo() {}

void DDTrackerPhiAltAlgo::initialize(const DDNumericArguments & nArgs,
                                     const DDVectorArguments & ,
                                     const DDMapArguments & ,
                                     const DDStringArguments & sArgs,
                                     const DDStringVectorArguments & ) {

  tilt       = nArgs["Tilt"];
  startAngle = nArgs["StartAngle"];
  rangeAngle = nArgs["RangeAngle"];
  radiusIn   = nArgs["RadiusIn"];
  radiusOut  = nArgs["RadiusOut"];
  zpos       = nArgs["ZPosition"];
  number     = int (nArgs["Number"]);
  startCopyNo= int (nArgs["StartCopyNo"]);
  incrCopyNo = int (nArgs["IncrCopyNo"]);

  LogDebug("TrackerGeom") << "DDTrackerPhiAltAlgo debug: Parameters for "
                          << "positioning--" << " Tilt " << tilt 
                          << "\tStartAngle " << startAngle/CLHEP::deg 
                          << "\tRangeAngle " << rangeAngle/CLHEP::deg 
                          << "\tRin " << radiusIn << "\tRout " << radiusOut 
                          << "\t ZPos " << zpos << "\tCopy Numbers " << number 
                          << " Start/Increment " << startCopyNo << ", " 
                          << incrCopyNo;

  idNameSpace = DDCurrentNamespace::ns();
  childName   = sArgs["ChildName"]; 
  DDName parentName = parent().name();
  LogDebug("TrackerGeom") << "DDTrackerPhiAltAlgo debug: Parent " << parentName
                          << "\tChild " << childName << " NameSpace " 
                          << idNameSpace;
}

void DDTrackerPhiAltAlgo::execute(DDCompactView& cpv) {

  if (number > 0) {
    double theta  = 90.*CLHEP::deg;
    double dphi;
    if (number == 1 || fabs(rangeAngle-360.0*CLHEP::deg)<0.001*CLHEP::deg) 
      dphi = rangeAngle/number;
    else
      dphi = rangeAngle/(number-1);
    int copyNo = startCopyNo;

    DDName mother = parent().name();
    DDName child(DDSplit(childName).first, DDSplit(childName).second);
    for (int i=0; i<number; i++) {
      double phi  = startAngle + i*dphi;
      double phix = phi - tilt + 90.*CLHEP::deg;
      double phiy = phix + 90.*CLHEP::deg;
      double phideg = phix/CLHEP::deg;
  
      DDRotation rotation;
      if (phideg != 0) {
        std::string rotstr =DDSplit(childName).first+dbl_to_string(phideg*10.);
        rotation = DDRotation(DDName(rotstr, idNameSpace));
        if (!rotation) {
          LogDebug("TrackerGeom") << "DDTrackerPhiAltAlgo test: Creating a new"
                                  << " rotation " << rotstr << "\t" << "90., "
                                  << phix/CLHEP::deg << ", 90.," 
                                  << phiy/CLHEP::deg << ", 0, 0";
          rotation = DDrot(DDName(rotstr, idNameSpace), theta, phix, theta,
                           phiy, 0., 0.);
        }
      }
        
      double xpos, ypos;
      if (i%2 == 0) {
        xpos = radiusIn*cos(phi);
        ypos = radiusIn*sin(phi);
      } else {
        xpos = radiusOut*cos(phi);
        ypos = radiusOut*sin(phi);
      }
      DDTranslation tran(xpos, ypos, zpos);
  
     cpv.position(child, mother, copyNo, tran, rotation);
      LogDebug("TrackerGeom") << "DDTrackerPhiAltAlgo test: " << child 
                              << " number " << copyNo << " positioned in " 
                              << mother << " at " << tran << " with " 
                              << rotation;
      copyNo += incrCopyNo;
    }
  }
}