TRIANGLE_IO
Read and Write TRIANGLE Files

TRIANGLE_IO is a C++ library which can read or write some simple versions of some of the files used by Jonathan Shewchuk's triangle() program.

Licensing:

The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.

Languages:

TRIANGLE_IO is available in a C version and a C++ version and a FORTRAN77 version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

FEM_TO_TRIANGLE, a C++ program which reads FEM files defining a 2D mesh of triangles, namely a file of node coordinates and a file of elements defined by node indices, and creates a corresponding pair of node and element files for use by Jonathan Shewchuk's triangle program.

POLY, a data directory which contains a description and examples of the POLY file format.

SHOWME, a C program which can display the POLY files uses as input to TRIANGLE, and the output files that define meshes and other objects.

TRIANGLE, a C program which computes Voronoi diagrams and Delaunay triangulations, and creates and manipulates files that can be displayed by SHOWME.

TRIANGLE_DISPLAY, a MATLAB program which displays the nodes and elements of a triangulation on the MATLAB graphics screen, assuming the data has been stored in NODE and ELE files by the TRIANGLE program.

TRIANGLE_FILES, a data directory which contains examples of files used by the triangle and showme programs.

TRIANGLE_TO_FEM, a C++ program which reads the NODE and ELE files created by TRIANGLE to describe a triangular mesh, and writes a corresponding pair of node and element files in the 2D FEM format.

TRIANGLE_TO_MEDIT, a C++ program which reads the NODE and ELE files created by TRIANGLE to describe a triangular mesh, and writes a corresponding MESH file for input to MEDIT.

TRIANGLE_TO_XML, a C++ program which reads the NODE and ELE files created by triangle() to describe a triangular mesh in 2D, and writes out a corresponding XML mesh file for use by DOLFIN or FENICS.

Reference:

1. http://www-2.cs.cmu.edu/~quake/triangle.html, the TRIANGLE web site;

Source Code:

• triangle_io.cpp, the source code.
• triangle_io.hpp, the include file.
• triangle_io.sh, BASH commands to compile the source code.

Examples and Tests:

• triangle_io_prb.cpp a sample calling program.
• triangle_io_prb.sh, BASH commands to compile and run the sample program.
• triangle_io_prb_output.txt, the output file.
• example.ele, an example ".ele" file created by the program.
• example.node, an example ".node" file created by the program.

List of Routines:

• I4_MAX returns the maximum of two I4's.
• I4_MIN returns the minimum of two I4's.
• I4MAT_COPY copies one I4MAT to another.
• I4MAT_TRANSPOSE_PRINT_SOME prints some of an I4MAT, transposed.
• I4VEC_COPY copies an I4VEC.
• R8MAT_COPY copies one R8MAT to another.
• R8MAT_TRANSPOSE_PRINT_SOME prints some of an R8MAT, transposed.
• TIMESTAMP prints the current YMDHMS date as a time stamp.
• TRIANGLE_ELEMENT_DATA_EXAMPLE returns the element information for the example.
• TRIANGLE_ELEMENT_DATA_READ reads the header information from an element file.
• TRIANGLE_ELEMENT_SIZE_EXAMPLE returns the element size information for the example.
• TRIANGLE_ELEMENT_SIZE_READ reads the header information from an element file.
• TRIANGLE_ELEMENT_WRITE writes a TRIANGLE ".ele" file.
• TRIANGLE_NODE_DATA_EXAMPLE returns the node information for the example.
• TRIANGLE_NODE_HEADER_READ reads the header information from a node file.
• TRIANGLE_NODE_SIZE_EXAMPLE returns the sizes of node information for the example.
• TRIANGLE_NODE_SIZE_READ reads the header information from a node file.
• TRIANGLE_NODE_WRITE writes a TRIANGLE ".node" file.

You can go up one level to the C++ source codes.