Vega|A user-centered approach to the distributed visualization of geometric algorithms

We present a new approach to the distributed vi-sualization of geometric algorithms that emphasizes the position of the end user. Concepts are introduced that enable a more exible usage of visualized geometric algorithms, while keeping the task of adapting existing algorithms to the new scheme as simple as possible. A main proposition is that interactivity should not be built into the visualized algorithms, but into the visualizing system. With this in mind, we devise a visualization model for geometric algorithms that incorporates strong algorithm execution control, exible manipulation of geometric input/output data and adjustable view attributes. The new visualization model is implemented in the Vega 1 system. Vega ooers distributed visualization of geometric algorithms based on source code annotation and supports the standard libraries LEDA and CGAL.