Prof. Dr. Jürgen Döllner


Tel.: +49-(0)331 5509-3921
Fax: +49-(0)331 5509-172
Room: H-2.22
Email: sebastian.hahn(at)hpi.de

Research Interests

  • Visual Software Analytics
  • Metaphor-based Visualization
  • Layout Stability
  • Evaluation of Visualization Techniques





Hybrid-Treemap Layouting

Hahn, Sebastian; Döllner, Jürgen in Proceedings of EuroVis 2017 - Short Papers 2017 .

This paper presents an approach for hybrid treemaps, which applies and combines several different layout principles within a single tree map in contrast to traditional treemap variants based on a single layout concept. To this end, we analyze shortcomings of state-of-the-art treemap algorithms such as Moore, Voronoi and Strip layouts. Based on a number of identified edge cases, we propose a combination of these different layout algorithms, individually selected for and applied on each sub-hierarchy of the given treemap data. The selection decision is based on the number of items to be layouted as well as the aspect-ratio of the containing visual elements. Futhermore, a layout quality score based on existing treemap layout metrics (e.g., average distance change, relative direction change, average aspect ratio) has been used to evaluate the results of the proposed hybrid layout algorithm and to demonstrate its usefulness applied on representative hierarchical data sets. © The Authors 2017. This is the authors' version of the work. It is posted here for your personal use. Not for redistribution. The definitive version will be published in Proceedings of the EuroVis2017.
Further Information
Tags Layout_Stability Treemaps cgs


WiSe 2016/17

  • Lecture 3D Computergraphics I (tutor)


  • Seminar Methods and Techniques of Software Visualization (tutor)
  • Lecture 3D Computergraphics II (tutor)


  • Seminar Systems Engineering for Software Analytics (tutor)


  • Seminar Visual Software Analytics (tutor)
  • Lecture Einführung in die Programmiertechnik II (tutor)


  • Seminar Visualization for Interactive Software Analytics (tutor)
  • Bachelor's project Software Analytics and Visualization (co-supervisor)

SoSe 2014

  • Lecture 3D Computergraphics I (tutor)

WiSe 2013/14

  • Seminar Software Analytics (tutor)
  • Seminar Game Programming (tutor)

SoSe 2013

  • Lecture Geovisualization (tutor)
  • Seminar Softwarevisualisierungsverfahren (tutor)

WiSe 2012/13

  • Bachelor's project A Visualization Tool for Software Evolution (co-supervisor)

SoSe 2012

  • Lecture Visualization (tutor)
  • Seminar Softwareanalyseverfahren (tutor)

Master's Theses

  • ThreadCity: Combined Visualization of Structure and Activity of Multi-threaded Software Systems - Nikolai Wuttke (finished

Further Activities

  • Participant of ETH Winter School on Eye Tracking  (January 2016)
  • Teaching-Team Member OpenHPI Course "Automated Visual Software Analytics" (March 2015)
  • SoftVis project in cooperation with the SAP Innovation Center, Potsdam (April 2012 - March 2016)