Capturing designers intentions from sketch input of 2D drawings

Ralph Martin

(University of Wales, Cardiff)

In the early stages of design of such objects as mechanical components, sketches of 2D geometry need to be input to a CAD system. This talk will discuss why mouse- and menu-based interfaces such as are found in most of today's drawing packages are not well suited to this task, and why a freehand sketching approach is more appropriate. In turn, this means that the computer system must be capable of interpreting the designer's intentions, as such a sketch will be far from perfect, and turning the sketch into an internal description of the represented geometry. This talk will describe a program we have developed (Easel) which uses a series of steps to produce a final tidied drawing. Easel involves such processes as detection of various curve types, inferring constraints the designer intended, and methods of attempting to enforce those constraints.
Tuesday 18th October 1994, 14:30
Seminar Room 322
Department of Computer Science