TRIANGULATION_SVG
SVG Image of Triangulation

TRIANGULATION_SVG is a FORTRAN77 program which creates an SVG image of a triangulation, which can be displayed by an web browser.

TRIANGULATION_SVG reads one file listing the nodes, and a second file consisting of groups of 3, 4 or 6 nodes that make up elements.

Usage:

triangulation_svg prefix

• 'prefix'_nodes.txt, the node coordinates.
• 'prefix'_elements.txt, the triangulation
• 'prefix'.svg, the plot file

Licensing:

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

Languages:

TRIANGULATION_SVG 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:

TRIANGULATION, a FORTRAN77 library which carries out various operations on order 3 ("linear") or order 6 ("quadratic") triangulations.

Reference:

1. W3C, Scalable Vector Graphics 1.1 (Second Edition), 16 August 2011, http://www.w3.org/TR/SVG11/

Source Code:

• triangulation_svg.f, the source code.
• triangulation_svg.sh, BASH commands to compile the source code.

Examples and Tests:

LAKE is a lake region.

• lake_nodes.txt the point coordinates.
• lake_elements.txt the triangulation.
• lake.svg an SVG image of the triangulation.

List of Routines:

• MAIN is the main program for TRIANGULATION_SVG.
• 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.
• FILE_COLUMN_COUNT counts the number of columns in the first line of a file.
• FILE_ROW_COUNT counts the number of row records in a file.
• GET_UNIT returns a free FORTRAN unit number.
• I4MAT_DATA_READ reads data from an I4MAT file.
• I4MAT_HEADER_READ reads the header from an I4MAT.
• I4MAT_TRANSPOSE_PRINT_SOME prints some of the transpose of an I4MAT.
• I4MAT_WRITE writes an I4MAT file.
• MESH_BASE_ONE ensures that the element definition is one-based.
• R8MAT_DATA_READ reads data from an R8MAT file.
• R8MAT_HEADER_READ reads the header from an R8MAT file.
• R8MAT_TRANSPOSE_PRINT_SOME prints some of an R8MAT, transposed.
• R8MAT_WRITE writes an R8MAT file.
• S_BLANK_DELETE removes blanks from a string, left justifying the remainder.
• 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.
• S_WORD_COUNT counts the number of "words" in a string.
• TIMESTAMP prints the current YMDHMS date as a time stamp.
• TRIANGULATION_PLOT plots a triangulation in SVG format.

You can go up one level to the FORTRAN77 source codes.