TRIANGLE_TO_XML
Convert Mesh Data from TRIANGLE to XML Format.

TRIANGLE_TO_XML is a FORTRAN90 program which reads a pair of node and element files created by the TRIANGLE program and writes a corresponding XML mesh file that can be used by FENICS or DOLFIN.

Usage:

triangle_to_xml prefix

• prefix.node contains the coordinates of the nodes;
• prefix.ele contains the indices of nodes forming each element.
• prefix.xml will be the XML mesh file.

Licensing:

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

Languages:

TRIANGLE_TO_XML is available in a C version and a C++ version and a FORTRAN90 version and a MATLAB version.

Related Data and Programs:

FEM_TO_XML, a FORTRAN90 program which reads FEM files defining a 1D, 2D or 3D mesh, namely a file of node coordinates and a file of elements defined by node indices, and creates a corresponding XML file for input to DOLFIN or FENICS.

FENICS, examples which illustrate the use of FENICS, a collection of free software with an extensive list of features for automated, efficient solution of partial differential equations (PDE's).

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_FILES, a data directory of examples of files used by the triangle and showme programs.

TRIANGLE_IO, a FORTRAN90 library which can read or write node and element files created by the TRIANGLE program.

TRIANGLE_TO_FEM, a FORTRAN90 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 FORTRAN90 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().

XML, a data directory which contains examples of XML files, a standard, general datafile format.

Source Code:

• triangle_to_xml.f90, the source code.

Examples and Tests:

• ell.node, a TRIANGLE node file.
• ell.ele, a TRIANGLE element file.
• ell.xml, the XML file created by the program.

List of Routines:

• MAIN is the main program for TRIANGLE_TO_XML.
• CH_CAP capitalizes a single character.
• CH_EQI is a case insensitive comparison of two characters for equality.
• CH_TO_DIGIT returns the integer value of a base 10 digit.
• GET_UNIT returns a free FORTRAN unit number.
• MESH_BASE_ZERO ensures that the element definition is zero-based.
• S_TO_I4 reads an I4 from a string.
• S_TO_I4VEC reads an I4VEC from a string.
• S_TO_R8 reads an R8 from a string.
• S_TO_R8VEC reads an R8VEC from a string.
• TIMESTAMP prints the current YMDHMS date as a time stamp.
• TRIANGLE_ELEMENT_DATA_READ reads the data from an element file.
• TRIANGLE_ELEMENT_SIZE_READ reads the header information from an element file.
• TRIANGLE_NODE_DATA_READ reads the data from a node file.
• TRIANGLE_NODE_SIZE_READ reads the header information from a node file.
• XML_MESH2D_WRITE writes 2D mesh data as a DOLFIN XML mesh file.

You can go up one level to the FORTRAN90 source codes.