/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_6_2_5/src/Alignment/CommonAlignment/src/SurveyDet.cc

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#include "Alignment/CommonAlignment/interface/SurveyDet.h"

SurveyDet::SurveyDet(const AlignableSurface& surface,
                     const align::ErrorMatrix& errors):
  theSurface(surface),
  theErrors(errors)
{
  const align::Scalar W3 = surface.width()  / 3.;
  const align::Scalar L3 = surface.length() / 3.;

  thePoints.reserve(4); // 4 survey points

//   thePoints.push_back( align::LocalPoint( 0.,  0., 0.) );
  thePoints.push_back( align::LocalPoint( W3,  0., 0.) );
//   thePoints.push_back( align::LocalPoint( W3,  L3, 0.) );
  thePoints.push_back( align::LocalPoint( 0.,  L3, 0.) );
//   thePoints.push_back( align::LocalPoint(-W3,  L3, 0.) );
  thePoints.push_back( align::LocalPoint(-W3,  0., 0.) );
//   thePoints.push_back( align::LocalPoint(-W3, -L3, 0.) );
  thePoints.push_back( align::LocalPoint( 0., -L3, 0.) );
//   thePoints.push_back( align::LocalPoint( W3, -L3, 0.) );
}

AlgebraicMatrix SurveyDet::derivatives(unsigned int index) const
{
  AlgebraicMatrix jac(6, 3, 0); // 6 by 3 Jacobian init to 0

//   jac(1, 1) = S11; jac(1, 2) = S12; jac(1, 3) = S13;
//   jac(2, 1) = S21; jac(2, 2) = S22; jac(2, 3) = S23;
//   jac(3, 1) = S31; jac(3, 2) = S32; jac(3, 3) = S33;

//   jac(4, 1) = u2 * S31;
//   jac(4, 2) = u2 * S32;
//   jac(4, 3) = u2 * S33;

//   jac(5, 1) = -u1 * S31;
//   jac(5, 2) = -u1 * S32;
//   jac(5, 3) = -u1 * S33;

//   jac(6, 1) = u1 * S21 - u2 * S11;
//   jac(6, 2) = u1 * S22 - u2 * S12;
//   jac(6, 3) = u1 * S23 - u2 * S13;

  jac(1, 1) = 1.; jac(2, 2) = 1.; jac(3, 3) = 1.;

  jac(5, 3) -= jac(6, 2) = thePoints[index].x();
  jac(6, 1) -= jac(4, 3) = thePoints[index].y();

  return jac;
}