The QPainterPath class provides a container for painting operations, enabling graphical shapes to be constructed and reused.| doc.qt.io
The QPaintEngineState class provides information about the active paint engine's current state.| doc.qt.io
The QTransform class specifies 2D transformations of a coordinate system.| doc.qt.io
The Qt namespace contains miscellaneous identifiers used throughout the Qt library.| doc.qt.io
The QPen class defines how a QPainter should draw lines and outlines of shapes.| doc.qt.io
Reference counting for fast copying.| doc.qt.io