Import Geant4 9.1.0 source tree

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+//
+// ********************************************************************
+// * License and Disclaimer                                           *
+// *                                                                  *
+// * The  Geant4 software  is  copyright of the Copyright Holders  of *
+// * the Geant4 Collaboration.  It is provided  under  the terms  and *
+// * conditions of the Geant4 Software License,  included in the file *
+// * LICENSE and available at  http://cern.ch/geant4/license .  These *
+// * include a list of copyright holders.                             *
+// *                                                                  *
+// * Neither the authors of this software system, nor their employing *
+// * institutes,nor the agencies providing financial support for this *
+// * work  make  any representation or  warranty, express or implied, *
+// * regarding  this  software system or assume any liability for its *
+// * use.  Please see the license in the file  LICENSE  and URL above *
+// * for the full disclaimer and the limitation of liability.         *
+// *                                                                  *
+// * This  code  implementation is the result of  the  scientific and *
+// * technical work of the GEANT4 collaboration and of QinetiQ Ltd,   *
+// * By using,  copying,  modifying or  distributing the software (or *
+// * any work based  on the software)  you  agree  to acknowledge its *
+// * use  in  resulting  scientific  publications,  and indicate your *
+// * acceptance of all terms of the Geant4 Software license.          *
+// ********************************************************************
+//
+// $Id:
+// GEANT4 tag $Name: geant4-09-01 $
+//
+// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+//
+// MODULE:              G4TessellatedGeometryAlgorithms.hh
+//
+// Date:                07/08/2005
+// Author:              Rickard Holmberg & Pete Truscott
+// Organisation:        QinetiQ Ltd, UK (PT)
+// Customer:            ESA-ESTEC / TEC-EES
+// Contract:            
+//
+// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+//
+// CHANGE HISTORY
+// --------------
+//
+// 07 August 2007, P R Truscott, QinetiQ Ltd, UK - Created, with member
+//                 functions based on the work of Rickard Holmberg.
+//
+// %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+//
+// Class description:
+//
+//   The G4TessellatedGeometryAlgorithms class is used to contain standard
+//   routines to determine whether (and if so where) simple geometric shapes
+//   intersect.
+//   
+//   The constructor doesn't need to do anything, and neither does the
+//   destructor.
+//   
+//   IntersectLineAndTriangle2D
+//     Determines whether there is an intersection between a line defined
+//     by r = p + s.v and a triangle defined by verticies P0, P0+E0 and P0+E1.
+//     Here:
+//        p = 2D vector
+//        s = scaler on [0,infinity)
+//        v = 2D vector
+//        P0, E0 and E1 are 2D vectors
+//     Information about where the intersection occurs is returned in the
+//     variable location.
+//
+//   IntersectLineAndLineSegment2D
+//     Determines whether there is an intersection between a line defined
+//     by r = P0 + s.D0 and a line-segment with endpoints P1 and P1+D1.
+//     Here:
+//        P0 = 2D vector
+//        s  = scaler on [0,infinity)
+//        D0 = 2D vector
+//        P1 and D1 are 2D vectors
+//     Information about where the intersection occurs is returned in the
+//     variable location.
+
+///////////////////////////////////////////////////////////////////////////////
+#ifndef G4TessellatedGeometryAlgorithms_hh
+#define G4TessellatedGeometryAlgorithms_hh 1
+
+#include "globals.hh"
+#include "G4TwoVector.hh"
+
+class G4TessellatedGeometryAlgorithms
+{
+  public:  // with description
+
+    static G4TessellatedGeometryAlgorithms* GetInstance();
+    G4bool IntersectLineAndTriangle2D (const G4TwoVector p,
+                                       const G4TwoVector v,
+                                       const G4TwoVector P0, 
+                                       const G4TwoVector E0,
+                                       const G4TwoVector E1,
+                                             G4TwoVector location[2]);
+
+    G4int IntersectLineAndLineSegment2D (const G4TwoVector P0,
+                                         const G4TwoVector D0,
+                                         const G4TwoVector P1,
+                                         const G4TwoVector D1,
+                                               G4TwoVector location[2]);
+
+    inline G4double cross(const G4TwoVector v1, const G4TwoVector v2) const;
+
+  protected:
+
+    G4TessellatedGeometryAlgorithms();
+
+  private:
+
+    static G4TessellatedGeometryAlgorithms *fInstance;
+};
+
+#include "G4TessellatedGeometryAlgorithms.icc"
+
+#endif