VisualOwnable is the bottom level base class for mplot::Visual. It has functionality that requires OpenGL function calls, but does not add anything that is specific to a particular windowing system.

This class is a mathplot-internal class and there is typically no access of its methods in mathplot client code.

However, if you want to incorporate mathplot graphics into another windowing system, this class provides the drawing functionality. For examples, see mplot/qt/viswidget.h for Qt and mplot/wx/viswx.h for wxWidgets. Note that these have not yet been converted to C++ modules (an exercise for the reader).