Abstract
We present an algorithm to support the dynamic embedding in the plane of a dynamic graph. An edge can be inserted across a face between two vertices on the boundary (we call such a vertex pair linkable), and edges can be deleted. The planar embedding can also be changed locally by flipping components that are connected to the rest of the graph by at most two vertices. Given vertices u, v, linkable(u, v) decides whether u and v are linkable, and if so, returns a list of suggestions for the placement of (u, v) in the embedding. For non-linkable vertices u, v, we define a new query, one-flip-linkable(u, v) providing a suggestion for a flip that will make them linkable if one exists. We will support all updates and queries in O(log2 n) time. Our time bounds match those of Italiano et al. for a static (flipless) embedding of a dynamic graph. Our new algorithm is simpler, exploiting that the complement of a spanning tree of a connected plane graph is a spanning tree of the dual graph. The primal and dual trees are interpreted as having the same Euler tour, and a main idea of the new algorithm is an elegant interaction between top trees over the two trees via their common Euler tour.
| Original language | English |
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| Title of host publication | 32nd Symposium on Theoretical Aspects of Computer Science (STACS 2015) |
| Editors | Ernst W. Mayr, Nicolas Ollinger |
| Number of pages | 13 |
| Publisher | Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik |
| Publication date | 1 Feb 2015 |
| Pages | 434-446 |
| ISBN (Electronic) | 978-3-939897-78-1 |
| DOIs | |
| Publication status | Published - 1 Feb 2015 |
| Event | 32nd International Symposium on Theoretical Aspects of Computer Science - Garching, Germany Duration: 4 Mar 2015 → 7 Mar 2015 Conference number: 32 |
Conference
| Conference | 32nd International Symposium on Theoretical Aspects of Computer Science |
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| Number | 32 |
| Country/Territory | Germany |
| City | Garching |
| Period | 04/03/2015 → 07/03/2015 |