FortranCAD
Version 26.02 of FORTRAN CAD is a utility to create DXF drawing files from a sequence of commands. All drawing elements are programmed and parameterised. The drawings created can be completed or transferred to other DXF drawings using other conventional CAD programs.
It can be used as a CAD graphics library for any programming language. The FortranCAD system is the one I have been using in Fortran for many years. The program is very simple and the results are very useful. Anyone working with programming or data files can easily learn the program.
How to use FORTRAN CAD. The program reads a data file containing information about the graphic entities to be drawn (lines, circles, polylines...). The result is a text file in DXF2000 format that can be edited with a CAD program. The data file is read sequentially line by line. Line elements are separated by one or more blanks or tabs.
Manual FortranCAD manual
Source code (GNU gfortran) forcad.f
Data file data.txt
Compile on Linux or a Cygwin console with: gfortran forcad.f
Run with: ./a.exe