MOAB: Mesh Oriented datABase  (version 5.4.0)
WriteSTL.hpp
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00001 /**
00002  * MOAB, a Mesh-Oriented datABase, is a software component for creating,
00003  * storing and accessing finite element mesh data.
00004  *
00005  * Copyright 2004 Sandia Corporation.  Under the terms of Contract
00006  * DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government
00007  * retains certain rights in this software.
00008  *
00009  * This library is free software; you can redistribute it and/or
00010  * modify it under the terms of the GNU Lesser General Public
00011  * License as published by the Free Software Foundation; either
00012  * version 2.1 of the License, or (at your option) any later version.
00013  *
00014  */
00015 
00016 #ifndef WRITE_STL_HPP
00017 #define WRITE_STL_HPP
00018 
00019 #include "moab/CartVect.hpp"
00020 #include "moab/Forward.hpp"
00021 #include "moab/WriterIface.hpp"
00022 
00023 #include <cstdio>
00024 
00025 namespace moab
00026 {
00027 
00028 class WriteUtilIface;
00029 
00030 /**
00031  * \brief ASCII and Binary Stereo Lithography File writers.
00032  * \author Jason Kraftcheck
00033  *
00034  * This writer will write only the MBTRI elements in the mesh.  It
00035  * will not decompose other 2-D elements into triangles, nor will
00036  * it skin the mesh or do any other high-level operation to generate
00037  * triangles from 3-D elements.
00038  *
00039  * Binary files will be written with a little-endian byte order by
00040  * default.  The byte order can be controlled with writer options.
00041  */
00042 class WriteSTL : public WriterIface
00043 {
00044 
00045   public:
00046     //! factory method forSTL writer
00047     static WriterIface* factory( Interface* );
00048 
00049     //! Constructor
00050     WriteSTL( Interface* impl );
00051 
00052     //! Destructor
00053     virtual ~WriteSTL();
00054 
00055     //! writes out a file
00056     ErrorCode write_file( const char* file_name,
00057                           const bool overwrite,
00058                           const FileOptions& opts,
00059                           const EntityHandle* output_list,
00060                           const int num_sets,
00061                           const std::vector< std::string >& qa_list,
00062                           const Tag* tag_list  = NULL,
00063                           int num_tags         = 0,
00064                           int export_dimension = 3 );
00065 
00066   protected:
00067     enum ByteOrder
00068     {
00069         STL_BIG_ENDIAN,
00070         STL_LITTLE_ENDIAN,
00071         STL_UNKNOWN_BYTE_ORDER
00072     };
00073 
00074     //! Write list of triangles to an STL file.
00075     ErrorCode ascii_write_triangles( FILE* file, const char header[81], const Range& triangles, int precision );
00076     //! Write list of triangles to an STL file.
00077     ErrorCode binary_write_triangles( FILE* file, const char header[81], ByteOrder byte_order, const Range& triangles );
00078 
00079     //! Given an array of vertex coordinates for a triangle,
00080     //! pass back individual point coordinates as floats and
00081     //! calculate triangle normal.
00082     ErrorCode get_triangle_data( const double vtx_coords[9], float v1[3], float v2[3], float v3[3], float n[3] );
00083 
00084     ErrorCode get_triangle_data( const double vtx_coords[9], CartVect& v1, CartVect& v2, CartVect& v3, CartVect& n );
00085 
00086     //! interface instance
00087     Interface* mbImpl;
00088     WriteUtilIface* mWriteIface;
00089 
00090   private:
00091     //! Construct 80-byte, null-terminated description string from
00092     //! qa_list.  Unused space in header will be null-char padded.
00093     ErrorCode make_header( char header[81], const std::vector< std::string >& qa_list );
00094 
00095     //! Get triangles to write from input array of entity sets.  If
00096     //! no sets, gets all triangles.
00097     ErrorCode get_triangles( const EntityHandle* set_array, int set_array_length, Range& triangles );
00098 
00099     //! Open a file, respecting passed overwrite value and
00100     //! subclass-specified value for need_binary_io().
00101     FILE* open_file( const char* name, bool overwrite, bool binary );
00102 };
00103 
00104 }  // namespace moab
00105 
00106 #endif
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