The core API is written using the object-oriented programming (OOP) in C++ and the OpenGL Shading Language (GLSL).
The documentation can be found at TBA.
SimpleGVXR is written using the procedural programming paradigm in C++. It is a smaller library build on the top of gVirtualXray. This way we can provide wrappers to Python, R, Ruby, Tcl, C#, Java, and GNU Octave.
The documentation can be found at TBA.
See the CHANGELOG file on SourceForge: