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: G4CircularCurve.cc,v 2.4 1998/10/20 16:33:43 broglia Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+
+#include "G4CircularCurve.hh"
+#include "G4Ellipse.hh"
+
+// G4CircularCurve
+G4CircularCurve::G4CircularCurve() {}
+G4CircularCurve::~G4CircularCurve() {}
+
+//////////////////////////////////////////////////////////////////////////////
+
+void G4CircularCurve::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 u = atan2(position.GetPY()(i), position.GetPX()(i));
+    
+    if (IsPOn(u)) 
+      bBox.Extend(GetPoint(u));
+    
+    if (IsPOn(u+pi)) 
+      bBox.Extend(GetPoint(u+pi));
+  }
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
+G4Curve* G4CircularCurve::Project(const G4Transform3D& tr)
+{
+  G4Ellipse e;
+  e.Init(position, radius, radius);
+  e.SetBounds(GetPStart(), GetPEnd());
+ 
+  return e.Project(tr);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
+G4bool G4CircularCurve::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() + p.x()*pos.GetPY();
+  return true;
+}
+