The QRect class defines a rectangle in the plane using integer precision.| doc.qt.io
The QPaintEvent class contains event parameters for paint events.| doc.qt.io
The QImage class provides a hardware-independent image representation that allows direct access to the pixel data, and can be used as a paint device.| doc.qt.io
The QWidget class is the base class of all user interface objects.| doc.qt.io
The QFont class specifies a query for a font used for drawing text.| doc.qt.io
The Qt namespace contains miscellaneous identifiers used throughout the Qt library.| doc.qt.io
The QPixmap class is an off-screen image representation that can be used as a paint device.| doc.qt.io
The QPainter class performs low-level painting on widgets and other paint devices.| doc.qt.io