A Language for 2D Parametric and Geometric Modelling - prESMod and Entity Selection

Abstract

The first part of this paper contains a theoretical definition of a language for 2D modeling - PrESMod with several characteristic definitions. This language can be used to describe forms with dimensions (constants), general dimensions (variables) and a combination of concrete and general dimensions. If the same theoretical approach used in the PrESMod modeling language is used in modeling operations in CAD systems, then such an approach can be supplemented with a conceptually similar approach used for selection. An approach to describing requirements for entity selection for modifications of CAD systems is given here. An attempt was made to organize this field in a universal fashion. Choice, i.e. selection of basic entities can be performed using any element from the description set. Besides this, part of the space (area) inside which, or outside which entities are selected can be possibly defined for selection.