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We demonstrate a focus+context (fisheye) scheme for viswdizing and manipulating kuge hierarchies. Our approach is to lay out the hierarchy uniformly on the hyperbolic plane and map this plane onto a circular display region. 'l'he projection onto the disk provides a natural mechanism for assigning more space to a portion of the hierarchy while still embedding it in a much larger context. Change of focus is accomplished by tmnslatingthe structure on the hyperbolic plane, which allows a smooth transition without compromising the presentation of the context.
Lamping et al. (Mon,) studied this question.