A practical, user-friendly interface for use in two-dimensional polygo
n modeling is presented in this paper. The interface is written for th
e Microsoft Windows environment and modeling is achieved by the intera
ctive creation and manipulation of polygonal bodies on the screen usin
g a mouse. The program makes use of the dynamic link library (DLL) pri
nciple to decouple the interface from its response calculation routine
. Examples of the interface applied to two-dimensional gravity and mag
netic models are given.