Edges and Switches, Tunnels and Bridges

Abstract. Edge casing is a well-known method to improve the readability of drawings of non-planar graphs. A cased drawing orders the edges of each edge crossing and interrupts the lower edge in an appropriate neighborhood of the crossing. Certain orders will lead to a more readable drawing than others. We formulate several optimization criteria that try to capture the concept of a “good” cased drawing. Further, we address the algorithmic question of how to turn a given drawing into an optimal cased drawing. For many of the resulting optimization problems, we either find polynomial time algorithms or NP-hardness results.

• Type: Conference
• Year: 2007
• Where: WADS
• Authors: David Eppstein, Marc J. van Kreveld, Elena Mumford, Bettina Speckmann
• Keywords: Algorithms, Drawing Orders, Edge, Optimal Cased Drawing, WADS 2007