Orthogonal graph drawing with inflexible edges
Orthogonal graph drawing with inflexible edges
复制标题
具有不灵活边缘的正交图绘制
DOI:
10.1016/j.comgeo.2016.03.001
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Ignaz Rutter
中科院分区:
文献类型:
--
作者:
Thomas Bläsius;Sebastian Lehmann;Ignaz Rutter
We consider the problem of creating plane orthogonal drawings of 4-planar graphs (planar graphs with maximum degree 4) with constraints on the number of bends per edge. More precisely, we have a flexibility function assigning to each edge e a natural number flex (e), its flexibility. The problem FlexDraw asks whether there exists an orthogonal drawing such that each edge e has at most flex (e) bends. It is known that FlexDraw is NP-hard if flex (e)= 0 for every edge e [1]. On the other hand, FlexDraw can be solved efficiently if flex (e)≥ 1 [2] and is trivial if flex (e)≥ 2 [3] for every edge e. To close the gap between the NP-hardness for flex (e)= 0 and the efficient algorithm for flex (e)≥ 1, we investigate the computational complexity of FlexDraw in case only few edges are inflexible (ie, have flexibility 0). We show that for any ε> 0 FlexDraw is NP-complete for instances with O (n ε) inflexible edges with pairwise distance Ω (n 1− ε)(including the case where they induce a matching), where n denotes the number of vertices in the graph. On the other hand, we give an FPT-algorithm with running time O (2 k⋅ n⋅ T flow (n)), where T flow (n) is the time necessary to compute a maximum flow in a planar flow network with multiple sources and sinks, and k is the number of inflexible edges having at least one endpoint of degree 4.
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影响因子:
1.1
作者:
G. Battista;R. Tamassia
通讯作者:
R. Tamassia
DOI:
10.1145/2838736
发表时间:
2016
期刊:
ACM Transactions on Algorithms (TALG)
影响因子:
--
作者:
Thomas Bläsius;Ignaz Rutter;Dorothea Wagner
通讯作者:
Dorothea Wagner
DOI:
--
发表时间:
2011
期刊:
J. Graph Algorithms Appl.
影响因子:
--
作者:
Sabine Cornelsen;Andreas Karrenbauer
通讯作者:
Andreas Karrenbauer
影响因子:
1.8
作者:
T. Biedl;G. Kant
通讯作者:
G. Kant
影响因子:
1.1
作者:
Thomas Bläsius;M. Krug;Ignaz Rutter;D. Wagner
通讯作者:
D. Wagner