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Last modified by Soeren Domroes on 2024/05/24 07:41
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edited by Soeren Domroes
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1 -New Crossing Minimization strategies for ELK and their use for SCCharts
1 +Node Placement with Flexible Node Size and Port Position
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1 -Theses.Topics for Student Theses.WebHome
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1 -There exist many one-sided crossing minimization strategies such as the Barycenter heuristic [1], the median heursitic [2], as well as sifting [3].
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4 +The Sugiyama algorithm consists of 5 phases: cycle breaking, layer assignment, crossing minimization, node placement and edge routing. Node placement sets the x-coordinates of nodes (in a downward layout) and creates alignment between nodes, improves edge straightness, or balances nodes based on their incoming edges. Node sizes can also be used to eliminate edge bends by increasing the size of nodes, as seen below, which makes the drawing easier to read, edges easier to follow and therefore easier to understand.
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3 -The Eclipse Layout Kernel currently supports only the Barycenter heuristic, as well as the greedy switch heuristic [4].
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4 4  
5 -Part of this thesis should be to implement, new crossing minimization strategies and compare them based on the SCCharts language and its models.
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14 +[[image:attach:jette-stpa-oyes.png]]
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20 +Figure showing the current layout without flexible node size and the existing ONO (obviously not optimal) parts of a layout with flexible node size
21 +
7 7  = Goals =
8 8  
9 -* Implement already existing crossing minimization strategies in ELK
10 -* Evaluate their use for a SCCharts
24 +* Improve the existing node size flexible network simplex node placement strategy by:\\
25 +** centering edges on their nodes if it does not compromise the quality of the layout (if necessary by increasing node sizes even more)
26 +** minimize the size of the drawing if possible
27 +* (optional) Explore options that need configuration depending on the context.
28 +** alignment of edges, ...
11 11  
12 12  = Scope =
13 13  
14 -Master's (Bachelor's) Thesis
32 +Bachelor Thesis
15 15  
16 16  = Related Work/Literature =
17 17  
18 -1. K. Sugiyama, S. Tagawa, and M. Toda. Methods for visual understanding of hierarchical system structures. IEEE Transactions on Systems, Man and Cybernetics, 11(2):109–125, February 1981.
19 -1. P. Eades and S. Whitesides. Drawing graphs in two layers. Theoretical Computer Science, 131:361–374, 1994
20 -1. Matuszewski, Christian, Robby Schönfeld, and Paul Molitor. "Using sifting for k-layer straightline crossing minimization." //Graph Drawing: 7th International Symposium, GD’99 Štiřín Castle, Czech Republic September 15–19, 1999 Proceedings 7//. Springer Berlin Heidelberg, 1999.
21 -1. P. Eades and D. Kelly. Heuristics for reducing crossings in 2-layered networks. Ars Combin., 21.A:89–98, 1986.
36 +Emden R. Gansner, Eleftherios Koutsofios, Stephen C. North, Kiem-Phong Vo, A technique for drawing directed graphs. Software Engineering 19(3), pp. 214-230, 1993.
22 22  
23 -= Involved Languages/Technologies =
38 +Ulf Rüegg, //Sugiyama Layouts for Prescribed Drawing Areas//, Disputation: 26 June 2018 ([[KCSS>>url:https://www.uni-kiel.de/journals/receive/jportal_jparticle_00000341||shape="rect" class="internal-link"]] 2018/1) (in Chapter 4.1 Network Simplex Approach)
24 24  
25 -* Java
26 -* ELK
40 +[[https:~~/~~/github.com/eclipse/elk/issues/853>>url:https://github.com/eclipse/elk/issues/853||shape="rect"]] (corresponding ticket in [[ELK>>url:https://www.eclipse.org/elk/||shape="rect"]])
27 27  
28 28  = Supervised By =
29 29  
30 30  Sören Domrös
31 -
32 -sdo@ifi
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1 -136183893
1 +136183937
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1 -https://rtsys.informatik.uni-kiel.de/confluence//wiki/spaces/RTSYS/pages/136183893/Node Placement with Flexible Node Size and Port Position
1 +https://rtsys.informatik.uni-kiel.de/confluence//wiki/spaces/RTSYS/pages/136183937/Node Placement with Flexible Node Size and Port Position