Conference Paper

Interactive Visual Classification with Euler Diagrams

DOI: 10.1109/VLHCC.2009.5295265 Conference: IEEE Symposium on Visual Languages and Human-Centric Computing, VL/HCC 2009, Corvallis, OR, USA, 20-24 September 2009, Proceedings
Source: DBLP


We present the theoretical foundation, the design and the implementation
of a library, called EulerVC to interactively handle Euler diagrams
for the purposes of resource management. Fast on-line algorithms
to interpret wellformed diagrams have been developed utilising a
new notion of marked points to keep track of the zone sets. The interface
allows the construction of overlapping ellipses to represent categories
together with the drag and drop of resources in order to categorise
them. A visual indicator can be used to show if the diagram under
construction is not wellformed to assist in reducing user mistakes,
and sets of tags can be assigned to resources upon export. The generic
approach is demonstrated via an integration with the bookmarking

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Available from: Gennaro Cordasco, Oct 13, 2015
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    • "Hence, it improves on existing work that was limited to so-called well-formed Euler diagrams which do not allow any of these properties to be present [2]. The algorithm in [2], as with our algorithm, has a time complexity that is exponential in the number of curves. This is because the running time of both is dependent on the number of zones, and the maximum number of zones for a set of curves, C, is 2 |C| . "
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    ABSTRACT: Euler diagrams form the basis of various visual languages but tool support for creating them is generally limited to generic diagram editing software using mouse and keyboard interaction. A more natural and convenient mode of entry is via a sketching interface which facilitates greater cognitive focus on the task of diagram creation. Previous work has developed sketching interfaces for Euler diagrams drawn with ellipses. This paper presents SketchSet, the first sketch tool for Euler diagrams whose curves can be circles, ellipses, or arbitrary shapes. SketchSet allows the creation of formal diagrams via point and click interaction. The user drawn diagram, in sketched or formal format, is automatically converted to a diagram in the other format, thus maintaining both views. We provide a mechanism that allows semantic differences between the sketch and the formal diagram to be rectified automatically. Finally, we present a user study that evaluates the effectiveness of the tool.
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    • "We introduce in [6] the new concept of marked Euler Diagrams, which are Euler diagrams together with a distinguished set of points which mark the zones of the diagram. This enables the tracking of the zone set via this set of marked points and is a fundamental concept utilised in our zone computation algorithm. "
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