DefaultCircleModel is the default implementation of
CircleModel.DefaultEllipseModel is the default implementation of
EllipseModel.DefaultFigureModel is the default implementation of
FigureModel.DefaultFigureModelExtended is the default implementation of
FigureModelExtended.DefaultLineSegmentModel is the default implementation of
LineSegmentModel.DefaultPointModel is the default implementation of
PointModel.DefaultPolylineModel is the default implementation of
PolylineModel.DefaultRectangleModel is the default implementation of
RectangleModel.DefaultSquareModel is the default implementation of
SquareModel.