In this paper we resolve the following problem: Given a simple polygon , what is the maximum-area polygon that is axially symmetric and is contained by ? We propose an algorithm for answering this question, analyze the algorithm’s complexity, and describe our implementation of it (for convex polygons). The algorithm is based on building and investigating a planar map, each cell of which corresp...

A floodlight of size α is a light source that projects light in a cone of size α . In this paper we study the problem of illuminating a convex polygon using floodlights. We give an O(n 2 ) time algorithm to find an optimal pair of floodlights to illuminate a convex polygon P with n vertices; that is a pair of floodlights to illuminate a convex polygon in such a way that the sum of their sizes i...

We present two algorithms for packing two largest disks in a polygon. The first algorithm locates two disks in a simple polygon in time O(n log2 n) improving the best previous deterministic result (Bespamyatnikh, 1999) by a factor of logn. The second algorithm finds two disks in a convex polygon such that the disks are separated by a diagonal of the polygon. It runs in time O(n log2 n) improvin...

Let Σ = { S1 , . . . , Sn } be a finite set of disjoint line segments in the plane. We conjecture that its visibility graph, Vis(Σ), is hamiltonian. In fact, we make the stronger conjecture that Vis(Σ) has a hamiltonian cycle whose embedded version is a simple polygon (i.e., its boundary edges are non-crossing visibility segments). We call such a simple polygon a spanning polygon of Σ. Existenc...

Let S be used to denote a nite set of planar geometric objects. Deene a polygon transversal of S as a closed simple polygon that simultaneously intersects every object in S, and a minimum polygon transversal of S as a polygon transversal of S with minimum perimeter. If S is a set of points then the minimum polygon transversal of S is the convex hull of S. However, when the objects in S have som...