Computational Geometry ( IF 0.6 ) Pub Date : 2021-05-14 , DOI: 10.1016/j.comgeo.2021.101789 Michael A. Bekos , Martin Gronemann , Fabrizio Montecchiani , Dömötör Pálvölgyi , Antonios Symvonis , Leonidas Theocharous
We study the algorithmic problem of computing drawings of graphs in which (i) each vertex is a disk with fixed radius ρ, each edge is a straight-line segment connecting the centers of the two disks representing its end-vertices, no two disks intersect, and the distance between an edge segment and the center of a non-incident disk, called edge-vertex resolution, is at least ρ. We call such drawings disk-link drawings.
In this paper we focus on the case of constant edge-vertex resolution, namely (i.e., disks of unit diameter). We prove that star graphs, which trivially admit straight-line drawings in linear area, require quadratic area in any such disk-link drawing. On the positive side, we present constructive techniques that yield improved upper bounds for the area requirements of disk-link drawings for several (planar and nonplanar) graph classes, including bounded bandwidth, complete, and planar graphs. In particular, the presented bounds for complete and planar graphs are asymptotically tight.
中文翻译:
具有恒定边线顶点分辨率的图的网格图
我们研究计算图形绘图的算法问题,其中(i)每个顶点是半径为ρ的圆盘, 每个边缘都是一条直线段,连接代表其末端顶点的两个圆盘的中心, 没有两个磁盘相交,并且 边缘段与非入射磁盘中心之间的距离,称为边缘顶点分辨率,至少为ρ。我们称此类图纸为磁盘链接图纸。
在本文中,我们关注恒定边顶点分辨率的情况,即 (即单位直径的圆盘)。我们证明了星形图(在平凡的线性区域中允许直线图形接受)在任何此类磁盘链接图形中都需要平方区域。从积极的方面来看,我们提出了一些建设性的技术,这些技术可为几个(平面和非平面)图类(包括有界带宽,完整图和平面图)提供磁盘链接图形的面积要求的上限。特别是,完整图和平面图的呈现边界渐近严格。