Import Geant4 0.0.0 source tree

2016-06-01 15:25:35 +02:00
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+// This code implementation is the intellectual property of
+// the RD44 GEANT4 collaboration.
+//
+// By copying, distributing or modifying the Program (or any work
+// based on the Program) you indicate your acceptance of this statement,
+// and all its terms.
+//
+// $Id: G4Parabola.cc,v 2.8 1998/10/29 17:49:38 broglia Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+#include "G4Parabola.hh"
+
+G4Parabola::G4Parabola(){}
+G4Parabola::~G4Parabola(){}
+
+G4Curve* G4Parabola::Project(const G4Transform3D& tr)
+{
+  G4double axisZ= (tr*position.GetPZ()).unit().z();
+
+  if (abs(axisZ)<kAngTolerance) 
+    return 0;
+  
+  
+  G4Vector3D newAxis(0, 0, axisZ>0? +1: -1);
+
+  G4Vector3D xPrime= tr*position.GetPX();
+  xPrime.setZ(0);
+  G4Vector3D yPrime= tr*position.GetPY();
+  yPrime.setZ(0);
+  G4double u= -(xPrime*yPrime)/xPrime.mag2();
+
+  G4Point3D newLocation= tr*position.GetLocation()+
+    focalDist*(u*u*xPrime+2*u*yPrime);
+  
+  newLocation.setZ(0);
+  G4Vector3D newRefDirection= xPrime;
+  G4double newFocalDist= (focalDist*((2*u+1)*xPrime+2*yPrime)).mag()/sqrt(5.);
+			  
+  // create the new parabola
+  G4Axis2Placement3D newPosition;
+  newPosition.Init(newRefDirection, newAxis, newLocation);
+  G4Parabola* r= new G4Parabola;
+  r->Init(newPosition, newFocalDist);
+
+  // introduce the shift in the parametrization
+  // maybe the Sign must be changed?
+  r->SetPShift(u);
+
+  // set the bounds when necessary
+  if (IsBounded()) 
+    r->SetBounds(GetPStart(), GetPEnd());
+  
+  return r;
+}
+
+
+void G4Parabola::InitBounded()
+{
+  // the bbox must include the start and endpoints as well as the
+  // extreme points if they lie on the curve
+  bBox.Init(GetStart(), GetEnd());
+
+  // the parameter values
+  // belonging to the points with an extreme x, y and z coordinate
+  for (G4int i=0; i<3; i++) 
+  {
+    G4double x_i= position.GetPX()(i);
+    
+    if (abs(x_i) <= kAngTolerance) 
+    {
+      G4double u= - position.GetPY()(i) / x_i;
+      if (IsPOn(u)) 
+	bBox.Extend(GetPoint(u));
+    }
+  }
+}
+
+
+G4bool G4Parabola::Tangent(G4CurvePoint& cp, G4Vector3D& v)
+{
+  // The tangent is computed from the 3D point representation
+  // for all conics. An alternaive implementation (based on
+  // the parametric point) might be worthwhile adding
+  // for efficiency.
+  
+  const G4Axis2Placement3D& pos= *(GetPosition());
+  G4Point3D p= pos.GetToPlacementCoordinates() * cp.GetPoint();
+
+  v= p.y()*pos.GetPX() + (2*focalDist)*pos.GetPY();
+  return true;
+}
+