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Information Visualization
Published in Alexandru Telea, Data Visualization, 2014
Essentially, the problem we face is that of drawing so-called Venn-Euler diagrams atop of a given visualization of the set E. A Venn-Euler diagram typically consists of a set of closed contours Cj so that all visual representations of elements in a subset Sj can be easily seen as being contained within Cj. Furthermore, the drawing of the contours Cj should help spotting all sets Sj into which a given element ei ∈ E falls.
Evaluating graphical manipulations in automatically laid out LineSets
Published in Behaviour & Information Technology, 2021
Dominique Tranquille, Gem Stapleton, Jim Burton, Peter Rodgers
In contrast to LineSets, many visualisations of sets use closed curves instead of set-lines. Euler diagrams are an example which exploits overlapping regions, surrounded by closed curves, to convey information about sets (Alsallakh et al. 2014). Given an Euler diagram, when overlaying a network, the closed curves constrain the location of the nodes (data items) and can therefore lead to a less than ideal layout of the network's edges. By contrast, when using LineSets the network is drawn first, with the set-lines subsequently drawn over the top of the network. Even though closed curves can appear to be a natural representation of sets, recent evidence suggests that using lines can be more effective (Rodgers, Stapleton, and Chapman 2014). In addition, compared to other techniques that overlay group information on node-link diagrams, such as GMap and simple node colouring, Jianu et al.'s study found LineSets to be a promising alternative to GMap diagrams for a range of task types: group-only tasks, network-only tasks and group-network tasks (Jianu et al. 2014). This evidence, together with the fact that LineSets do not compromise the layout of the network, leads us to conjecture that improving the design of LineSets could make them more effective than techniques based on closed curves when visualising grouped network data. So it is important to understand how the choice of their graphical properties impacts on task performance. The intention of the work in this paper is to improve the visualisation of LineSets so that users can better comprehend the underlying data.