G4TessellatedGeometryAlgorithms.hh

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00027 // $Id:
00028 //
00029 // %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
00030 //
00031 // Class G4TessellatedGeometryAlgorithms
00032 //
00033 // Class description:
00034 //
00035 //   The G4TessellatedGeometryAlgorithms class is used to contain standard
00036 //   routines to determine whether (and if so where) simple geometric shapes
00037 //   intersect.
00038 //   
00039 //   The constructor doesn't need to do anything, and neither does the
00040 //   destructor.
00041 //   
00042 //   IntersectLineAndTriangle2D
00043 //     Determines whether there is an intersection between a line defined
00044 //     by r = p + s.v and a triangle defined by verticies P0, P0+E0 and P0+E1.
00045 //     Here:
00046 //        p = 2D vector
00047 //        s = scaler on [0,infinity)
00048 //        v = 2D vector
00049 //        P0, E0 and E1 are 2D vectors
00050 //     Information about where the intersection occurs is returned in the
00051 //     variable location.
00052 //
00053 //   IntersectLineAndLineSegment2D
00054 //     Determines whether there is an intersection between a line defined
00055 //     by r = P0 + s.D0 and a line-segment with endpoints P1 and P1+D1.
00056 //     Here:
00057 //        P0 = 2D vector
00058 //        s  = scaler on [0,infinity)
00059 //        D0 = 2D vector
00060 //        P1 and D1 are 2D vectors
00061 //     Information about where the intersection occurs is returned in the
00062 //     variable location.
00063 
00064 // CHANGE HISTORY
00065 // --------------
00066 //
00067 // 07 August 2007, P R Truscott, QinetiQ Ltd, UK - Created, with member
00068 //                 functions based on the work of Rickard Holmberg.
00069 // 12 October 2012, M Gayer, CERN, - Reviewed optimized implementation.
00070 //
00072 #ifndef G4TessellatedGeometryAlgorithms_hh
00073 #define G4TessellatedGeometryAlgorithms_hh 1
00074 
00075 #include "G4TwoVector.hh"
00076 
00077 class G4TessellatedGeometryAlgorithms
00078 {
00079   public:
00080 
00081     static G4bool IntersectLineAndTriangle2D (const G4TwoVector &p,
00082                                               const G4TwoVector &v,
00083                                               const G4TwoVector &p0, 
00084                                               const G4TwoVector &e0,
00085                                               const G4TwoVector &e1,
00086                                                     G4TwoVector location[2]);
00087     static G4int IntersectLineAndLineSegment2D (const G4TwoVector &p0,
00088                                                 const G4TwoVector &d0,
00089                                                 const G4TwoVector &p1,
00090                                                 const G4TwoVector &d1,
00091                                                       G4TwoVector location[2]);
00092     static G4double cross(const G4TwoVector &v1, const G4TwoVector &v2);
00093 };
00094 
00095 #endif

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