Gabriele Cosmo
68 lines
1.8 KiB
C++
68 lines
1.8 KiB
C++
// This code implementation is the intellectual property of
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// the RD44 GEANT4 collaboration.
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//
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// By copying, distributing or modifying the Program (or any work
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// based on the Program) you indicate your acceptance of this statement,
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// and all its terms.
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//
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// $Id: G4CircularCurve.cc,v 2.4 1998/10/20 16:33:43 broglia Exp $
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// GEANT4 tag $Name: geant4-00 $
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//
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#include "G4CircularCurve.hh"
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#include "G4Ellipse.hh"
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// G4CircularCurve
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G4CircularCurve::G4CircularCurve() {}
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G4CircularCurve::~G4CircularCurve() {}
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//////////////////////////////////////////////////////////////////////////////
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void G4CircularCurve::InitBounded()
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{
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// the bbox must include the start and endpoints as well as the
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// extreme points if they lie on the curve
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bBox.Init(GetStart(), GetEnd());
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// the parameter values
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// belonging to the points with an extreme x, y and z coordinate
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for (G4int i=0; i<3; i++)
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{
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G4double u = atan2(position.GetPY()(i), position.GetPX()(i));
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if (IsPOn(u))
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bBox.Extend(GetPoint(u));
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if (IsPOn(u+pi))
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bBox.Extend(GetPoint(u+pi));
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}
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}
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//////////////////////////////////////////////////////////////////////////////
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G4Curve* G4CircularCurve::Project(const G4Transform3D& tr)
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{
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G4Ellipse e;
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e.Init(position, radius, radius);
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e.SetBounds(GetPStart(), GetPEnd());
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return e.Project(tr);
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}
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//////////////////////////////////////////////////////////////////////////////
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G4bool G4CircularCurve::Tangent(G4CurvePoint& cp, G4Vector3D& v)
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{
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// The tangent is computed from the 3D point representation
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// for all conics. An alternaive implementation (based on
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// the parametric point) might be worthwhile adding
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// for efficiency.
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const G4Axis2Placement3D& pos= *(GetPosition());
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G4Point3D p= pos.GetToPlacementCoordinates() * cp.GetPoint();
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v= -p.y()*pos.GetPX() + p.x()*pos.GetPY();
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return true;
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}
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