On embedding a graph in the grid with the minimum number of bends
SIAM Journal on Computing
On the Computational Complexity of Upward and Rectilinear Planarity Testing
SIAM Journal on Computing
On edge colorings of 1-planar graphs
Information Processing Letters
Re-embeddings of Maximum 1-Planar Graphs
SIAM Journal on Discrete Mathematics
Right angle crossing graphs and 1-planarity
GD'11 Proceedings of the 19th international conference on Graph Drawing
Minimal Obstructions for 1-Immersions and Hardness of 1-Planarity Testing
Journal of Graph Theory
On the density of maximal 1-planar graphs
GD'12 Proceedings of the 20th international conference on Graph Drawing
Hi-index | 5.23 |
A 1-planar graph is a graph that can be embedded in the plane with at most one crossing per edge. It is known that testing 1-planarity of a graph is NP-complete. In this paper, we consider maximal 1-planar graphs. A graph G is maximal 1-planar if addition of any edge destroys 1-planarity of G. We first study combinatorial properties of maximal 1-planar embeddings. In particular, we show that in a maximal 1-planar embedding, the graph induced by the non-crossing edges is spanning and biconnected. Using the properties, we show that the problem of testing maximal 1-planarity of a graph G can be solved in linear time, if a rotation system @F (i.e., the circular ordering of edges for each vertex) is given. We also prove that there is at most one maximal 1-planar embedding @x of G that is consistent with the given rotation system @F. Our algorithm also produces such an embedding in linear time, if it exists.