g4simulation/g4gdml/PHG4GDMLWriteDefine.cc

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0026 //
0027 // $Id: PHG4GDMLWriteDefine.cc 68053 2013-03-13 14:39:51Z gcosmo $
0028 //
0029 // class PHG4GDMLWriteDefine Implementation
0030 //
0031 // Original author: Zoltan Torzsok, November 2007
0032 //
0033 // --------------------------------------------------------------------
0034
0035 #include "PHG4GDMLWriteDefine.hh"
0036 #include <Geant4/G4SystemOfUnits.hh>
0037
0038 const G4double PHG4GDMLWriteDefine::kRelativePrecision = DBL_EPSILON;
0039 const G4double PHG4GDMLWriteDefine::kAngularPrecision = DBL_EPSILON;
0040 const G4double PHG4GDMLWriteDefine::kLinearPrecision = DBL_EPSILON;
0041
0042 PHG4GDMLWriteDefine::PHG4GDMLWriteDefine()
0043   :  defineElement(nullptr)
0044 {
0045 }
0046
0047 G4ThreeVector PHG4GDMLWriteDefine::GetAngles(const G4RotationMatrix& mtx)
0048 {
0049    G4double x;
0050    G4double y;
0051    G4double z;
0052    G4RotationMatrix mat = mtx;
0053    mat.rectify();   // Rectify matrix from possible roundoff errors
0054
0055    // Direction of rotation given by left-hand rule; clockwise rotation
0056
0057    static const G4double kMatrixPrecision = 10E-10;
0058    const G4double cosb = std::sqrt(mtx.xx()*mtx.xx()+mtx.yx()*mtx.yx());
0059
0060    if (cosb > kMatrixPrecision)
0061    {
0062       x = std::atan2(mtx.zy(),mtx.zz());
0063       y = std::atan2(-mtx.zx(),cosb);
0064       z = std::atan2(mtx.yx(),mtx.xx());
0065    }
0066    else
0067    {
0068       x = std::atan2(-mtx.yz(),mtx.yy());
0069       y = std::atan2(-mtx.zx(),cosb);
0070       z = 0.0;
0071    }
0072
0073    return G4ThreeVector(x,y,z);
0074 }
0075
0076 void PHG4GDMLWriteDefine::
0077 Scale_vectorWrite(xercesc::DOMElement* element, const G4String& tag,
0078                   const G4String& name, const G4ThreeVector& scl)
0079 {
0080    const G4double x = (std::fabs(scl.x()-1.0) < kRelativePrecision)
0081                     ? 1.0 : scl.x();
0082    const G4double y = (std::fabs(scl.y()-1.0) < kRelativePrecision)
0083                     ? 1.0 : scl.y();
0084    const G4double z = (std::fabs(scl.z()-1.0) < kRelativePrecision)
0085                     ? 1.0 : scl.z();
0086
0087    xercesc::DOMElement* scaleElement = NewElement(tag);
0088    scaleElement->setAttributeNode(NewAttribute("name",name));
0089    scaleElement->setAttributeNode(NewAttribute("x",x));
0090    scaleElement->setAttributeNode(NewAttribute("y",y));
0091    scaleElement->setAttributeNode(NewAttribute("z",z));
0092    element->appendChild(scaleElement);
0093 }
0094
0095 void PHG4GDMLWriteDefine::
0096 Rotation_vectorWrite(xercesc::DOMElement* element, const G4String& tag,
0097                      const G4String& name, const G4ThreeVector& rot)
0098 {
0099    const G4double x = (std::fabs(rot.x()) < kAngularPrecision) ? 0.0 : rot.x();
0100    const G4double y = (std::fabs(rot.y()) < kAngularPrecision) ? 0.0 : rot.y();
0101    const G4double z = (std::fabs(rot.z()) < kAngularPrecision) ? 0.0 : rot.z();
0102
0103    xercesc::DOMElement* rotationElement = NewElement(tag);
0104    rotationElement->setAttributeNode(NewAttribute("name",name));
0105    rotationElement->setAttributeNode(NewAttribute("x",x/degree));
0106    rotationElement->setAttributeNode(NewAttribute("y",y/degree));
0107    rotationElement->setAttributeNode(NewAttribute("z",z/degree));
0108    rotationElement->setAttributeNode(NewAttribute("unit","deg"));
0109    element->appendChild(rotationElement);
0110 }
0111
0112 void PHG4GDMLWriteDefine::
0113 Position_vectorWrite(xercesc::DOMElement* element, const G4String& tag,
0114                      const G4String& name, const G4ThreeVector& pos)
0115 {
0116    const G4double x = (std::fabs(pos.x()) < kLinearPrecision) ? 0.0 : pos.x();
0117    const G4double y = (std::fabs(pos.y()) < kLinearPrecision) ? 0.0 : pos.y();
0118    const G4double z = (std::fabs(pos.z()) < kLinearPrecision) ? 0.0 : pos.z();
0119
0120    xercesc::DOMElement* positionElement = NewElement(tag);
0121    positionElement->setAttributeNode(NewAttribute("name",name));
0122    positionElement->setAttributeNode(NewAttribute("x",x/mm));
0123    positionElement->setAttributeNode(NewAttribute("y",y/mm));
0124    positionElement->setAttributeNode(NewAttribute("z",z/mm));
0125    positionElement->setAttributeNode(NewAttribute("unit","mm"));
0126    element->appendChild(positionElement);
0127 }
0128
0129 void PHG4GDMLWriteDefine::DefineWrite(xercesc::DOMElement* element)
0130 {
0131   std::cout << "PHG4GDML: Writing definitions..." << std::endl;
0132
0133    defineElement = NewElement("define");
0134    element->appendChild(defineElement);
0135 }