TRIANGLE_IO
Read and Write TRIANGLE Files

TRIANGLE_IO, a MATLAB 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 FORTRAN90 version and a MATLAB version.

Related Data and Programs:

FEM_TO_TRIANGLE, a MATLAB 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 of examples of files used by the triangle and showme programs.

triangle_io_test

TRIANGLE_TO_FEM, a MATLAB program which reads the NODE and ELE files created by triangle() to describe a triangular mesh, and writes two simple "mesh" format files, listing node coordinates and element connectivity.

TRIANGLE_TO_MEDIT, a MATLAB 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 MATLAB 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.

Source Code:

• i4mat_transpose_print.m, prints an I4MAT, transposed.
• i4mat_transpose_print_some.m, prints some of the transpose of an I4MAT.
• r8mat_transpose_print.m, prints an R8MAT, transposed.
• r8mat_transpose_print_some.m, prints some of an R8MAT, transposed.
• s_len_trim.m, returns the length of a string to the last nonblank.
• timestamp.m, prints the current YMDHMS date as a time stamp.
• triangle_element_data_example.m, returns the element information for the example.
• triangle_element_data_read.m, reads the data from an element file.
• triangle_element_size_example.m, returns the element size information for the example.
• triangle_element_size_read.m, reads the header information from an element file.
• triangle_element_write.m, writes a TRIANGLE ".ele" file.
• triangle_node_data_example.m, returns the node information for the example.
• triangle_node_data_read.m, reads the data from a node file.
• triangle_node_size_example.m, returns the sizes of node information for the example.
• triangle_node_size_read.m, reads the header information from a node file.
• triangle_node_write.m, writes a TRIANGLE ".node" file.