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Constraint-based graph drawing systems provide expressive power and flexibility. Previously proposed approaches make use of general constraint solvers, which are inefficient, and of textual specification of constraints, which can be long and difficult to understand. In this paper we propose the use of a constraint-based visual language for constructing planar drawings of trees, series-parallel graphs, and acyclic digraphs in linear time. A graph drawing system based on our approach can therefore provide the power of constraint-based graph drawing, the simplicity of visual specifications, and the computational efficiency that is typical of the algorithmic-based approaches

Drawing graphs by example efficiently: Trees and planar acyclic digraphs (extended abstract)