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Graphviz guide Drawing graphs with Graphviz Emden R Gansner November CGraphvizDrawing Library Manual November Contents Introduction String-based layouts dot xdot plain plain-ext GXL Graphviz as a library Basic graph drawing Creating the graph Attributes C

Drawing graphs with Graphviz Emden R Gansner November CGraphvizDrawing Library Manual November Contents Introduction String-based layouts dot xdot plain plain-ext GXL Graphviz as a library Basic graph drawing Creating the graph Attributes Cleaning up a graph Laying out the graph Getting layout information Drawing nodes and edges Inside the layouts dot neato fdp twopi circo Using the output drivers Graphics code generators Style information Color information Using codegen t to draw nodes and edges Unconnected graphs A Compiling and linking A Finer-grained usage A Application-speci ?c data B A sample program simple c C A sample program dot c D A sample program demo c E String representations of types CGraphvizDrawing Library Manual November Introduction The Graphviz package consists of a variety of software for drawing attributed graphs It implements a handful of common graph layout algorithms These are dot A Sugiyama-style hierarchical layout STT GKNV neato An implementation of the Kamada-Kawai algorithm KK for ??symmetric ? layouts This is a variation of multidimensional scaling KS Coh fdp An implementation of the Fruchterman-Reingold algorithm FR for ??symmetric ? layouts This layout is similar to neato but there are performance and feature di ?erences twopi A radial layout as described by Wills Wil circo A circular layout combining aspects of the work of Six and Tollis ST ST and Kaufmann and Wiese KW In addition Graphviz provides an assortment of more general-purpose graph algorithms such as transitive reduction which have proven useful in the context of graph drawing The package was designed GN to rely on the ??program-as- ?lter ? model of software in which distinct graph operations or transformations are embodied as programs Graph drawing and manipulation are achieved by using the output of one ?lter as the input of another with each ?lter recognizing a common text-based graph format One thus has an algebra of graphs using a scripting language to provide the base language with variables and function application and composition Despite the simplicity and utility of this approach some applications need or desire to use the software as a library with bindings in a non-scripting language rather than as primitives composed using a scripting language The Graphviz software provides a variety of ways to achieve this running a spectrum from very simple but somewhat in exible to fairly complex but o ?ering a good deal of application control String-based layouts The simplest mechanism for doing this consists of using the ?lter approach in disguise The application perhaps using the libgraph or libagraph library constructs a representation of a graph in the DOT language The application can then invoke the desired layout program e g using system or popen on a Unix system passing the graph using an intermediate ?le or a pipe The layout program computes position information for the graph attaches this as attributes and delivers the graph back to the application through another ?le or pipe The application can then read in the graph and apply the geometric information as necessary This is the approach