Abstract
We consider weak Gabriel drawings of unbounded degree trees in the three-dimensional space. We assume a minimum distance between any two vertices. Under the same assumption, there exists an exponential area lower bound for general graphs. Moreover, all previously known algorithms to construct (weak) proximity drawings of trees, generally produce exponential area layouts, even when we restrict ourselves to binary trees. In this paper we describe a linear-time polynomial-volume algorithm that constructs a strictly-upward weak Gabriel drawing of any rooted tree with O(log n)-bit requirement. As a special case we describe a Gabriel drawing algorithm for binary trees which produces integer coordinates and n 3-area representations. Finally, we show that an infinite class of graphs requiring exponential area, admits linear-volume Gabriel drawings. The latter result can also be extended to β-drawings, for any 1 < β < 2, and relative neighborhood drawings.
Work partially supported by the Italian Project MURST-“Algorithms and Data Structure”
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Penna, P., Vocca, P. (1998). Proximity Drawings: Three Dimensions Are Better than Two. In: Whitesides, S.H. (eds) Graph Drawing. GD 1998. Lecture Notes in Computer Science, vol 1547. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-37623-2_21
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DOI: https://doi.org/10.1007/3-540-37623-2_21
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