A directed graph is logically zoomed, whereby the appearance of a node directly related to a target node can be exaggerated and the structure of an entire graph can be readily understood. A directed graph is used in which hierarchical nodes are connected by arcs. In the directed graph, a node that has...http://www.google.com/patents/US6437799?utm_source=gb-gplus-sharePatent US6437799 - Method and apparatus for logical zooming of a directed graph
