here is a simple project done by my classmate.hope u find it useful
Abstract: The proposed project produces 2d and 3d shapes and solids respectively . In 2d we can make various shapes like line , rectangle and circle . Even it provides an eraser to correct your diagrams in 2d.In 3d by using a cone and sphere we get many stages like if only sphere is there , if only cone is there . if both are there , etc .In 3d we can also rotate the objects.
The full project source code and PPT presentation is attached..