Enp expression Designer: a Visual Tool for Creating ENP-Expressions

In the present paper we introduce a new tool called ENP Expression Designer (ED). It is aimed at visually creating new notational attributes (ENP-expressions) in ENP. ENP, in turn, is a music notation program written in Lisp and CLOS with a special focus on compositional and music analytical applications. Currently, ENP allows to create new expressions by using Lisp and CLOS. The strictly textual interface can, however, be demanding to those users that have limited or no experience in programming. ED provides an easy and straightforward way to define new expressions through a graphical user interface. Through inheritance the ED allows to reuse the built-in properties of the existing ENP-expressions. We also provide a set of graphical primitives for drawing lines, text, etc. Additionally, more experienced users can take full advantage of the OpenGL graphical language.