2026/03/09 by Alexander Dobler, Siddharth Gupta, Philipp Kindermann +2
#cs.CG
Storyline layouts visualize temporal interactions by drawing each character as an x-monotone curve and enforcing that the participants of every meeting form a contiguous vertical group. We study a drawing extension variant in which a layout of a sub-storyline is fixed and has to be extended by inserting k missing characters while adhering to all meeting constraints. We consider two optimization objectives: minimizing the number of additional crossings introduced to complete the storyline, and minimizing the maximum number of crossings incurred by any single character. For both variants, we analyze the parameterized complexity with respect to the natural parameter k representing the size of the missing information, as well as additional structural parameters such as the number of characters σ per time instant and the number of meetings μ involving missing characters. We contribute a broad collection of results, most of them tight, drawing a nearly complete picture of the complexity landscape of these extension problems.