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How to Draw a Sequence Diagram

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that the most important place to draw a participant in a sequence diagram ... When we want to draw a given subset of vertices from left to right (from top ...

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How to Draw a Sequence DiagramPage 1How to Draw a Sequence DiagramTimo Poranen Erkki Makinen and Jyrki NummenmaaDepartment of Computer and Information SciencesKanslerinrinne 1FIN33014 University of TampereFinland{tpemjyrki}@cs.uta.fiAbstrac t. In this paper we consider the aesthetic criteria and constraints related to the layouts of UML sequence diagrams. We considerthe applicability of the traditional graph drawing aesthetics in drawingsequence diagrams. Because of the special nature of sequence diagramsmany of these aesthetics are not applicable. Based on our view on howthese diagrams are read or viewed we propose some new aesthetics. Wealso take into account the presence of usually adopted conventions andconstraints.The basic choice in producing a drawing for a sequence diagram is thelinear order of the participating objects. Based on this finding and theidentified aesthetics criteria we formulate some related computationalproblems.1 IntroductionThe Unified Modeling Language (UML) 21] is currently the standard notation for modeling softwareintensive systems. In UML sequence diagrams aretypically used to describe system dynamics. Sequence diagrams depict systemdynamics by showing the participating objects (classes components etc.) in theinteraction and the sequence of messages exchanged.A sequence diagram has two dimensions: the vertical dimension representstime and the horizontal dimension represents the objects participating in theinteraction. Time flows from top to bottom. Objects (or classifier roles moregenerally) are shown as vertical lines (called lifelines) and messages as horizontalarrows extending from a sender object to a receiver object. Spacing is irrelevantthat is only the order of messages matters not the distance between them.The diagrams produced by analysts are typically not very large. Based uponour experiments they may contain something like 515 lifelines and up to 30messages. If they tend to get larger they are usually decomposed hierarchically ...

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