Subsystems
This section describes the Circle subsystems. A subsystems is a group of classes, which implements services for a specific purpose, which are different from the Basic system services and are normally provided by its own library (see Libraries). Only those classes are discussed here, which are directly used by applications. All Circle classes are listed in doc/classes.txt.
The Circle project does not provide a single centralized C++ header file. Instead the header file(s), which must be included for a specific class, function or macro definition are specified in the related subsection.