Some Box Design Issues in PWGL

This paper gives an overview of how boxes are created in PWGL. PWGL is a visual language based on Common Lisp, CLOS and OpenGL. PWGL boxes can be categorized as follows. Simple boxes define the basic interface between PWGL and its baselanguages Common Lisp and CLOS. Visual editors constitute another important subcategory of PWGL boxes. Finally, more complex boxes can be used to create PWGL applications ranging from simple ones to complex embedded boxes that can contain several editors and other types of input-boxes. We discuss the components of a PWGL box, how boxes are constructed and give some remarks on how to define the layout of a PWGL box.