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arXiv · 1708.09515

On Upward Drawings of Trees on a Given Grid

Therese Biedl·Debajyoti Mondal
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Abstract

Computing a minimum-area planar straight-line drawing of a graph is known to be NP-hard for planar graphs, even when restricted to outerplanar graphs. However, the complexity question is open for trees. Only a few hardness results are known for straight-line drawings of trees under various restrictions such as edge length or slope constraints. On the other hand, there exist polynomial-time algorithms for computing minimum-width (resp., minimum-height) upward drawings of trees, where the height (resp., width) is unbounded. In this paper we take a major step in understanding the complexity of the area minimization problem for strictly-upward drawings of trees, which is one of the most common styles for drawing rooted trees. We prove that given a rooted tree $T$ and a $W\times H$ grid, it is NP-hard to decide whether $T$ admits a strictly-upward (unordered) drawing in the given grid.

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Therese Biedl, Debajyoti Mondal. 2017-08-31. On Upward Drawings of Trees on a Given Grid. https://arxiv.org/abs/1708.09515

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