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Compared with macro visualization like small-world structure
in WWW, some fields such as knowledge visualization need such layout that can
show detailed information of nodes and at the same time can reveal clustered
structure of the Graph. Based on modular decomposition, energy model and adjustable
center distance, one hierarchical layout algorithm was proposed. Through modular
decomposition, the graph was firstly represented by a tree hierarchically. The
local positions were then obtained from bottom to top and then the global positions
are obtained from top to bottom. The experimental results on various datasets
showed that the algorithm can achieve artistic and nearly non-overlapping appearance.
