Minimum-link paths revisited
2014 (English)In: Computational geometry, ISSN 0925-7721, E-ISSN 1879-081X, Vol. 47, no 6, 651-667 p.Article in journal (Refereed) Published
A path or a polygonal domain is C-oriented if the orientations of its edges belong to a set of C given orientations; this is a generalization of the notable rectilinear case (C = 2). We study exact and approximation algorithms for minimum-link C-oriented paths and paths with unrestricted orientations, both in C-oriented and in general domains. Our two main algorithms are as follows: A subquadratic-time algorithm with a non-trivial approximation guarantee for general (unrestricted-orientation) minimum-link paths in general domains. An algorithm to find a minimum-link C-oriented path in a C-oriented domain. Our algorithm is simpler and more time-space efficient than the prior algorithm. We also obtain several related results: 3SUM-hardness of determining the link distance with unrestricted orientations (even in a rectilinear domain). An optimal algorithm for finding a minimum-link rectilinear path in a rectilinear domain. The algorithm and its analysis are simpler than the existing ones. An extension of our methods to find a C-oriented minimum-link path in a general (not necessarily C-oriented) domain. A more efficient algorithm to compute a 2-approximate C-oriented minimum-link path. A notion of "robust" paths. We show how minimum-link C-oriented paths approximate the robust paths with unrestricted orientations to within an additive error of 1.
Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 47, no 6, 651-667 p.
Path planning; Link distance; Approximations; 3SUM-hardness
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-106274DOI: 10.1016/j.comgeo.2013.12.005ISI: 000333728300003OAI: oai:DiVA.org:liu-106274DiVA: diva2:715765