Polar Coordinate Drawing of Planar Graphs with Good Angular Resolution

Authors

  • Christian Duncan
  • Stephen Kobourov

DOI:

https://doi.org/10.7155/jgaa.00073

Abstract

We present a novel way to draw planar graphs with good angular resolution. We introduce the polar coordinate representation and describe a family of algorithms for constructing it. The main advantage of the polar representation is that it allows independent control over grid size and bend positions. We first describe a standard (Cartesian) representation algorithm, CRA, which we then modify to obtain a polar representation algorithm, PRA. In both algorithms we are concerned with the following drawing criteria: angular resolution, bends per edge, vertex resolution, bend-point resolution, edge separation, and drawing area. The CRA algorithm achieves 1 bend per edge, unit vertex and bend resolution, √2/2 edge separation, 5n×[(5n)/2] drawing area and [1/(2d(v))] angular resolution, where d(v) is the degree of vertex v. The PRA algorithm has an improved angular resolution of [(π)/(4d(v))], 1 bend per edge, and unit vertex resolution. For the PRA algorithm, the bend-point resolution and edge separation are parameters that can be modified to achieve different types of drawings and drawing areas. In particular, for the same parameters as the CRA algorithm (unit bend-point resolution and √2/2 edge separation), the PRA algorithm creates a drawing of size 9n ×[(9n)/2].

Downloads

Download data is not yet available.

Downloads

Published

2003-01-01

How to Cite

Duncan, C., & Kobourov, S. (2003). Polar Coordinate Drawing of Planar Graphs with Good Angular Resolution. Journal of Graph Algorithms and Applications, 7(4), 311–333. https://doi.org/10.7155/jgaa.00073