G4NURBScylinder.cc

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// $Id$
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// Olivier Crumeyrolle  12 September 1996

// Cylinder builder implementation
// OC 090796

#include "G4NURBScylinder.hh"

// the cylinder constructor use the first G4NURBS constructor
// look in G4NURBStube if you want to see how to use the second one.

G4NURBScylinder::G4NURBScylinder(G4double R, G4double DZ)
  : G4NURBS  ( 2, 3,  // linear along U, quadratic along V
               4, 9,  // half rectangle along U, circle along V
               (new t_CtrlPt [ 4 * 9 ]),  // the array for CtrlPts
               0,     // the knot vector along U will be generated
               (new t_Knot [ 3 + 9 ]) )   // knot vector for the circle
{
  // define the V knot vector
  m[V].pKnots[ 0] = 0;
  m[V].pKnots[ 1] = 0;
  m[V].pKnots[ 2] = 0;
  m[V].pKnots[ 3] = 0.25;
  m[V].pKnots[ 4] = 0.25;
  m[V].pKnots[ 5] = 0.5;
  m[V].pKnots[ 6] = 0.5;
  m[V].pKnots[ 7] = 0.75;
  m[V].pKnots[ 8] = 0.75;
  m[V].pKnots[ 9] = 1;
  m[V].pKnots[10] = 1;
  m[V].pKnots[11] = 1;

  // define control points

  const G4double sr2o2 = std::sqrt(2.)/2. ;

  CP(mpCtrlPts[ 0] ,  0,  0,  DZ, 1 );
  CP(mpCtrlPts[ 1] ,  R, 0,  DZ, 1 );
  CP(mpCtrlPts[ 2] ,  R, 0, -DZ, 1 );
  CP(mpCtrlPts[ 3] ,  0,  0, -DZ, 1 );

  CP(mpCtrlPts[ 4] ,  0,  0,  DZ, 1 );
  CP(mpCtrlPts[ 5] ,  R, R, DZ, 1 , sr2o2);
  CP(mpCtrlPts[ 6] ,  R, R,-DZ, 1 , sr2o2);
  CP(mpCtrlPts[ 7] ,  0,  0, -DZ, 1 );

  CP(mpCtrlPts[ 8] ,  0,  0,  DZ, 1 );
  CP(mpCtrlPts[ 9] ,  0, R,  DZ, 1 );
  CP(mpCtrlPts[10] ,  0, R, -DZ, 1 );
  CP(mpCtrlPts[11] ,  0,  0, -DZ, 1 );

  CP(mpCtrlPts[12] ,  0,  0,  DZ, 1 );
  CP(mpCtrlPts[13] , -R, R, DZ, 1 , sr2o2);
  CP(mpCtrlPts[14] , -R, R,-DZ, 1 , sr2o2);
  CP(mpCtrlPts[15] ,  0,  0, -DZ, 1 );

  CP(mpCtrlPts[16] ,  0,  0,  DZ, 1 );
  CP(mpCtrlPts[17] , -R, 0,  DZ, 1 );
  CP(mpCtrlPts[18] , -R, 0, -DZ, 1 );
  CP(mpCtrlPts[19] ,  0,  0, -DZ, 1 );

  CP(mpCtrlPts[20] ,  0,  0,  DZ, 1 );
  CP(mpCtrlPts[21] , -R,-R, DZ, 1 , sr2o2);
  CP(mpCtrlPts[22] , -R,-R,-DZ, 1 , sr2o2);
  CP(mpCtrlPts[23] ,  0,  0, -DZ, 1 );

  CP(mpCtrlPts[24] ,  0,  0,  DZ, 1 );
  CP(mpCtrlPts[25] ,  0, -R, DZ, 1 );
  CP(mpCtrlPts[26] ,  0, -R,-DZ, 1 );
  CP(mpCtrlPts[27] ,  0,  0, -DZ, 1 );

  CP(mpCtrlPts[28] ,  0,  0,  DZ, 1 );
  CP(mpCtrlPts[29] ,  R,-R, DZ, 1 , sr2o2);
  CP(mpCtrlPts[30] ,  R,-R,-DZ, 1 , sr2o2);
  CP(mpCtrlPts[31] ,  0,  0, -DZ, 1 );

  CP(mpCtrlPts[32] ,  0,  0,  DZ, 1 );
  CP(mpCtrlPts[33] ,  R, 0,  DZ, 1 );
  CP(mpCtrlPts[34] ,  R, 0, -DZ, 1 );
  CP(mpCtrlPts[35] ,  0,  0, -DZ, 1 );
}

const char* G4NURBScylinder::Whoami() const
{
  return "Cylinder";
}