Snapping Graph Drawings to the Grid Optimally

  • Andre LöfflerEmail author
  • Thomas C. van Dijk
  • Alexander Wolff
Conference paper
Part of the Lecture Notes in Computer Science book series (LNCS, volume 9801)


In geographic information systems and in the production of digital maps for small devices with restricted computational resources one often wants to round coordinates to a rougher grid. This removes unnecessary detail and reduces space consumption as well as computation time. This process is called snapping to the grid and has been investigated thoroughly from a computational-geometry perspective. In this paper we investigate the same problem for given drawings of planar graphs under the restriction that their combinatorial embedding must be kept and edges are drawn straight-line. We show that the problem is NP-hard for several objectives and provide an integer linear programming formulation. Given a plane graph G and a positive integer w, our ILP can also be used to draw G straight-line on a grid of width w and minimum height (if possible).


Integer Linear Program Cyclic Order Integer Linear Programming Formulation Graph Drawing Polygonal Chain 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



We thank Gergely Mincsovics for suggesting this problem to us.


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Copyright information

© Springer International Publishing AG 2016

Authors and Affiliations

  • Andre Löffler
    • 1
    Email author
  • Thomas C. van Dijk
    • 1
  • Alexander Wolff
    • 1
  1. 1.Lehrstuhl Für Informatik IUniversität WürzburgWürzburgGermany

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