Optimal Orthogonal Graph Drawing with Convex Bend Costs
Optimal Orthogonal Graph Drawing with Convex Bend Costs
复制标题
具有凸弯曲成本的最优正交图绘制
DOI:
10.1145/2838736
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发表时间:
2016
期刊:
影响因子:
--
通讯作者:
Dorothea Wagner
中科院分区:
文献类型:
--
作者:
Thomas Bläsius;Ignaz Rutter;Dorothea Wagner
Traditionally, the quality of orthogonal planar drawings is quantified by the total number of bends or the maximum number of bends per edge. However, this neglects that, in typical applications, edges have varying importance. We consider the problem OptimalFlexDrawthat is defined as follows. Given a planar graphGonnvertices with maximum degree 4 (4-planar graph) and for each edgeea cost function coste: N0→ R defining costs depending on the number of bendsehas, compute a planar orthogonal drawing ofGof minimum cost.In this generality OptimalFlexDrawis NP-hard. We show that it can be solved efficiently if (1) the cost function of each edge is convex and (2) the first bend on each edge does not cause any cost. Our algorithm takes timeO(n, ⋅,Tflow(n) andO(n2, ⋅,Tflow(n)) for biconnected and connected graphs, respectively, whereTflow(n) denotes the time to compute a minimum-cost flow in a planar network with multiple sources and sinks. Our result is the first polynomial-time bend-optimization algorithm for general 4-planar graphs optimizing over all embeddings. Previous work considers restricted graph classes and unit costs.
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影响因子:
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通讯作者:
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DOI:
--
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期刊:
J. Graph Algorithms Appl.
影响因子:
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DOI:
10.1016/j.comgeo.2016.03.001
发表时间:
2016
期刊:
影响因子:
--
作者:
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通讯作者:
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