An example class hierarchy of geometry figures in 2D and 3D including circle, rectangle, square, cube and sphere.
The example consist of the following classes in hierarchical order:
Point2D(Two dimensional space point)Point3D(Three dimensional space point)
Shape(Generic shape)Shape2D(Two dimensional shapes)CircleRectangleSquare
- Shape3D (Three dimensional bodies)
CubeSphere
Classes Shape2D and Shape3D aggregate a reference point as Point2D and Point3D respectively. Classes for three dimensional bodies aggregate their base two dimensional shape, so Cube aggregates a Square and Sphere aggregates a Circle.
Two dimensional shapes implement area and perimeter methods while three dimensional bodies does not implement perimeter, but implement volume.