,
Nicolau Oliver
,
Evanthia Papadopoulou
Creative Commons Attribution 4.0 International license
Abstract Voronoi diagrams are defined in terms of a given system of planar bisecting curves satisfying some simple combinatorial properties. They offer a unifying framework for a wide range of concrete Voronoi instances on generalized sites and metrics. In this paper, we formulate higher-order abstract color Voronoi diagrams of a set S of n colored abstract sites, simultaneously considering all concrete instances under their umbrella. We prove that the number of vertices in the order-k abstract color Voronoi diagram is at most 4k(n-k)-2n, and present an iterative construction algorithm. The bound directly applies to a family of m disjoint simple polygons of total complexity n. For simple polygons the bound can further improve to O(min{k(n-k),(m-k)²n}). A critical ingredient of our proof is a combinatorial analysis on circular sequences of color permutations derived from the unbounded edges of these diagrams that is interesting in its own right.
@InProceedings{bae_et_al:LIPIcs.ESA.2026.138,
author = {Bae, Sang Won and Oliver, Nicolau and Papadopoulou, Evanthia},
title = {{Abstract Color Voronoi Diagrams and Circular Sequences of Color Permutations}},
booktitle = {34th Annual European Symposium on Algorithms (ESA 2026)},
pages = {138:1--138:20},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-445-1},
ISSN = {1868-8969},
year = {2026},
volume = {388},
editor = {Bille, Philip and Pettie, Seth and Storandt, Sabine},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.ESA.2026.138},
URN = {urn:nbn:de:0030-drops-272748},
doi = {10.4230/LIPIcs.ESA.2026.138},
annote = {Keywords: higher-order Voronoi diagrams, abstract Voronoi diagrams, color Voronoi diagrams, circular sequences, allowable sequences, generalized sites, simple polygons}
}