Speaking in terms of graph properties, State-transition diagrams are directed graphs.

We suggest to represent State-transition diagrams with upward drawings, i.e., drawings in which the eges tend to flow, as much as possible, in a common direction. Also, for State-transition diagrams we suggest to represent edges with smoothed lines.

The following figure shows an example of a State-transition diagram constructed with GDT.

GAPI tutorial on upward drawings and BLAG tutorial on upward drawings provide a comprehensive guide on how to use GDT to construct these widely used drawings.

Another possibility is to represent State-transition diagrams with polyline drawings, i.e., drawings. GAPI tutorial on polyline drawings and BLAG tutorial on plyline drawings provide a comprehensive guide on how to use GDT to construct these widely used drawings.

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