Modern Fortran modules that contain interfaces to the free X11 graphics library EGGX/ProCALL. The EGGX/ProCALL library provides fast and simple drawing routines on Linux, Unix, and Cygwin, directly callable from C or FORTRAN 77.

EGGX/ProCALL 2003 is a wrapper around EGGX/ProCALL that includes:

• Fortran 90 interfaces to the FORTRAN 77 ProCALL subroutines (module procall).
• Selected Fortran 2003 ISO C binding interfaces to C functions in EGGX that do not have a FORTRAN counterpart (module eggx).
• Named parameters of key codes, colour palettes, and output formats.

Simply clone the GitHub repository and execute the Makefile:

$ git clone https://github.com/interkosmos/eggx-procall-2003
$ cd eggx-procall-2003/
$ make

The EGGX/ProCALL 0.95 source code is included in directory vendor/eggx-0.95/.

Link your Fortran application with vendor/eggx-0.95/libeggx.a, libeggx2003.a, and -lX11, for instance:

$ gfortran -o demo demo.f90 libeggx.a libeggx2003.a -lX11

See directory examples/ for some demo applications:

• julia draws the Julia set.
• mandelbrot draws the Mandelbrot set.
• munch renders a graphical pattern.
• peano draws a Peano curve.
• snake sprites-based implementation of the snake game.
• starfield lets you fly through a starfield.
• tiles draws text and a tileset to screen.
• wireframe renders the 3D model of a Tie-Figher.

Compile all programs with:

$ make examples

Or, use the name of a particular example. Run each program from its respective directory:

$ make <name>
$ cd examples/<name>/
$ ./<name>

For the official documentation, see the PDF file vendor/eggx-0.95/eggx_procall.pdf.

Generate the source code documentation with FORD. Add FORD with pip, for example:

$ python3 -m venv virtual-environment/
$ source virtual-environment/bin/activate
$ python3 -m pip install ford

Or, instead, just install the package in your user directory:

$ python3 -m pip install --user ford

Then, run:

$ ford project.md -d ./src

Open doc/index.html in a web browser.

GNU GPL (EGGX/ProCALL), ISC (EGXX/ProCALL 2003)