PHG4GDMLWriteDefine.cc

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// $Id: PHG4GDMLWriteDefine.cc 68053 2013-03-13 14:39:51Z gcosmo $
//
// class PHG4GDMLWriteDefine Implementation
//
// Original author: Zoltan Torzsok, November 2007
//
// --------------------------------------------------------------------

#include "PHG4GDMLWriteDefine.hh"
#include <Geant4/G4SystemOfUnits.hh>

const G4double PHG4GDMLWriteDefine::kRelativePrecision = DBL_EPSILON;
const G4double PHG4GDMLWriteDefine::kAngularPrecision = DBL_EPSILON;
const G4double PHG4GDMLWriteDefine::kLinearPrecision = DBL_EPSILON;

PHG4GDMLWriteDefine::PHG4GDMLWriteDefine()
  : PHG4GDMLWrite(), defineElement(0)
{
}

PHG4GDMLWriteDefine::~PHG4GDMLWriteDefine()
{
}

G4ThreeVector PHG4GDMLWriteDefine::GetAngles(const G4RotationMatrix& mtx)
{
   G4double x,y,z;
   G4RotationMatrix mat = mtx;
   mat.rectify();   // Rectify matrix from possible roundoff errors

   // Direction of rotation given by left-hand rule; clockwise rotation

   static const G4double kMatrixPrecision = 10E-10;
   const G4double cosb = std::sqrt(mtx.xx()*mtx.xx()+mtx.yx()*mtx.yx());

   if (cosb > kMatrixPrecision)
   {
      x = std::atan2(mtx.zy(),mtx.zz());
      y = std::atan2(-mtx.zx(),cosb);
      z = std::atan2(mtx.yx(),mtx.xx());
   }
   else
   {
      x = std::atan2(-mtx.yz(),mtx.yy());
      y = std::atan2(-mtx.zx(),cosb);
      z = 0.0;
   }

   return G4ThreeVector(x,y,z);
}

void PHG4GDMLWriteDefine::
Scale_vectorWrite(xercesc::DOMElement* element, const G4String& tag,
                  const G4String& name, const G4ThreeVector& scl)
{
   const G4double x = (std::fabs(scl.x()-1.0) < kRelativePrecision)
                    ? 1.0 : scl.x();
   const G4double y = (std::fabs(scl.y()-1.0) < kRelativePrecision)
                    ? 1.0 : scl.y();
   const G4double z = (std::fabs(scl.z()-1.0) < kRelativePrecision)
                    ? 1.0 : scl.z();

   xercesc::DOMElement* scaleElement = NewElement(tag);
   scaleElement->setAttributeNode(NewAttribute("name",name));
   scaleElement->setAttributeNode(NewAttribute("x",x));
   scaleElement->setAttributeNode(NewAttribute("y",y));
   scaleElement->setAttributeNode(NewAttribute("z",z));
   element->appendChild(scaleElement);
}

void PHG4GDMLWriteDefine::
Rotation_vectorWrite(xercesc::DOMElement* element, const G4String& tag,
                     const G4String& name, const G4ThreeVector& rot)
{
   const G4double x = (std::fabs(rot.x()) < kAngularPrecision) ? 0.0 : rot.x();
   const G4double y = (std::fabs(rot.y()) < kAngularPrecision) ? 0.0 : rot.y();
   const G4double z = (std::fabs(rot.z()) < kAngularPrecision) ? 0.0 : rot.z();

   xercesc::DOMElement* rotationElement = NewElement(tag);
   rotationElement->setAttributeNode(NewAttribute("name",name));
   rotationElement->setAttributeNode(NewAttribute("x",x/degree));
   rotationElement->setAttributeNode(NewAttribute("y",y/degree));
   rotationElement->setAttributeNode(NewAttribute("z",z/degree));
   rotationElement->setAttributeNode(NewAttribute("unit","deg"));
   element->appendChild(rotationElement);
}

void PHG4GDMLWriteDefine::
Position_vectorWrite(xercesc::DOMElement* element, const G4String& tag,
                     const G4String& name, const G4ThreeVector& pos)
{
   const G4double x = (std::fabs(pos.x()) < kLinearPrecision) ? 0.0 : pos.x();
   const G4double y = (std::fabs(pos.y()) < kLinearPrecision) ? 0.0 : pos.y();
   const G4double z = (std::fabs(pos.z()) < kLinearPrecision) ? 0.0 : pos.z();

   xercesc::DOMElement* positionElement = NewElement(tag);
   positionElement->setAttributeNode(NewAttribute("name",name));
   positionElement->setAttributeNode(NewAttribute("x",x/mm));
   positionElement->setAttributeNode(NewAttribute("y",y/mm));
   positionElement->setAttributeNode(NewAttribute("z",z/mm));
   positionElement->setAttributeNode(NewAttribute("unit","mm"));
   element->appendChild(positionElement);
}

void PHG4GDMLWriteDefine::DefineWrite(xercesc::DOMElement* element)
{
  std::cout << "PHG4GDML: Writing definitions..." << std::endl;

   defineElement = NewElement("define");
   element->appendChild(defineElement);
}