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.TH NEATO 1 "12 August 1994"
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neato \- preprocessor for drawing undirected graphs
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\fBneato\fR [\fB\-G\fIname=value\fR]
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[\fB\-N\fIname=value\fR]
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[\fB\-o \fIoutfile\fR]
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draws undirected graphs using ``spring'' models (see Kamada and Kawai,
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Information Processing Letters 31:1, April 1989). Input files must be
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attributed graph language.
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By default, the output of
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is the input graph with layout coordinates appended.
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To make Postscript, use the \fB\-Tps\fP option.
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FrameMaker MIF (\fB-Tmif\fP), HPGL (\fB-Thpgl\fP),
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and GIF (\fB-Tgif\fP) are other choices.
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Here is a brief synopsis of the graph language.
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\fBgraph \fIname\fP { \fIstatement-list\fP }\fR is the top level graph.
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\fIname\fB=\fIval\fB;\fR
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\fBnode [\fIname\fB=\fIval\fB];\fR
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\fBedge [\fIname\fB=\fIval\fB];\fR
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Set the default graph, node, or edge attribute \fIname\fP to \fIval\fP.
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Any subgraph, node, or edge specified after one of these statements
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inherits these attributes.
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\fBn0 [\fIname0=val0,name1=val1,...\fB];\fR
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Creates node \fBn0\fP if it does not exist,
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and sets its attributes according to the optional list.
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\fBn0 \-\- n1 \-\- \fI...\fB \-\- nn [\fIname0=val0,name1=val1,...\fB];\fR
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Creates edges between nodes \fBn0\fP, \fBn1\fP, ..., \fBnn\fP and optionally
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sets the given attributes. Creates nodes as necessary.
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\fBsubgraph \fIname\fB { \fIstatement-list \fB}\fR
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Creates a subgraph. A subgraph may appear in place of
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an individual node within an edge statement.
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The \fBsubgraph \fIname\fR part is optional. If missing,
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the subgraph is given an internal name.
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While attribute names and values may be arbitrary strings,
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certain fixed attributes control \fIneato\fP's layout algorithm,
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.SH "GRAPH ATTRIBUTES"
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Refer to \fIdot\fP(1) options to control the layout size.
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In addition, \fIneato\fP recognizes the following:
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\fBstart=\fIval\fR. Requests random initial placement and seeds
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the random number generator. If \fIval\fP is not an integer,
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the process ID or current time is used as the seed.
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\fBepsilon=\fIn\fR. Sets the cutoff for the solver.
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Refer to \fIdot\fP(1) for options to control node labels, shapes,
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sizes, colors, fonts, etc.
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Refer to \fIdot\fP(1) for options to control edge line style
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and labels. In addition \fIneato\fP recognizes the following:
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\fBw=\fIf\fR sets the weight (spring constant) of an edge
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to the given floating point value. The default is 1.0;
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greater values make the edge tend more toward its optimal length.
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\fBlen=\fIf\fR sets the optimal length of an edge.
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.SH "COMMAND LINE OPTIONS"
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\fB\-v\fP (verbose) prints delta energy every 100th iteration.
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x \-\- y [w=5.0,len=3];
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Because unconstrained optimization is employed, node boxes can
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possibly overlap or touch unrelated edges. All existing
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spring embedders seem to have this limitation.
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Apparently reasonable attempts to pin nodes or adjust edge lengths
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and weights can cause instability.
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S. C. North, "NEATO User's Manual".
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Available on research.att.com in dist/drawdag/neatodoc.ps.Z.
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dotneato/neato.1
