Import Geant4 0.0.0 source tree

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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: G4LineSection.hh,v 2.1 1998/07/12 02:54:56 urbi Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+//
+//  A utility class that calculates the distance of a point from a 
+//   line section.
+//
+//  
+
+#include "globals.hh" 
+#include "G4ThreeVector.hh"
+
+typedef G4ThreeVector  POINT;
+typedef POINT          Vector;
+
+
+class G4LineSection {
+  public:
+     G4LineSection( const POINT& PntA, const POINT& PntB );
+
+     G4double Dist( POINT OtherPnt ) const;
+     G4double InvsqDistAB() const { return inverse_square_distAB; }  
+
+     //
+     static G4double Distline( const POINT& OtherPnt, 
+			       const POINT& LinePntA, 
+			       const POINT& LinePntB );
+  private:
+     POINT    EndpointA;
+     Vector   VecAtoB;
+     G4double inverse_square_distAB;
+};