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DOT(1)			    General Commands Manual			DOT(1)

NAME
       dot - filter for	drawing	directed graphs
       neato - filter for drawing undirected graphs
       twopi - filter for radial layouts of graphs
       circo - filter for circular layout of graphs
       fdp - filter for	drawing	undirected graphs
       sfdp - filter for drawing large undirected graphs
       patchwork - filter for squarified tree maps
       osage - filter for array-based layouts

SYNOPSIS
       dot [options] [files]
       neato [options] [files]
       twopi [options] [files]
       circo [options] [files]
       fdp [options] [files]
       sfdp [options] [files]
       patchwork [options] [files]
       osage [options] [files]

DESCRIPTION
       These  are a collection of programs for drawing graphs.	There is actu-
       ally only one main program; the specific	layout algorithms  are	imple-
       mented  as  plugins.  Thus, they	largely	share all of the same command-
       line options.

       dot draws directed graphs.  It works well on  directed  acyclic	graphs
       and  other  graphs  that	 can be	drawn as hierarchies or	have a natural
       ``flow.''

       neato draws undirected graphs using a ``spring''	model and reducing the
       related	energy	(see  Kamada and Kawai,	Information Processing Letters
       31:1, April 1989).

       twopi draws graphs using	a radial layout	(see G.	 Wills,	 Symposium  on
       Graph  Drawing  GD'97, September, 1997).	 Basically, one	node is	chosen
       as the center and put at	the origin.  The remaining nodes are placed on
       a  sequence  of	concentric  circles  centered about the	origin,	each a
       fixed radial distance from the previous circle.	All nodes  distance  1
       from  the  center  are placed on	the first circle; all nodes distance 1
       from a node on the first	circle are placed on the second	circle;	and so
       forth.

       circo  draws graphs using a circular layout (see	Six and	Tollis,	GD '99
       and ALENEX '99, and Kaufmann and	Wiese, GD '02.)	 The  tool  identifies
       biconnected  components	and draws the nodes of the component on	a cir-
       cle. The	block-cutpoint tree is then laid out using a recursive	radial
       algorithm.  Edge	 crossings within a circle are minimized by placing as
       many edges on the circle's perimeter as possible.   In  particular,  if
       the  component is outerplanar, the component will have a	planar layout.
       If a node belongs to multiple non-trivial biconnected  components,  the
       layout puts the node in one of them. By default,	this is	the first non-
       trivial component found in the search from the root component.

       fdp draws undirected graphs using a ``spring'' model. It	 relies	 on  a
       force-directed  approach	in the spirit of Fruchterman and Reingold (cf.
       Software-Practice & Experience 21(11), 1991, pp.	1129-1164).

       sfdp also draws undirected graphs using the ``spring'' model  described
       above,  but  it uses a multi-scale approach to produce layouts of large
       graphs in a reasonably short time.

       patchwork draws the graph as a squarified treemap (see M. Bruls et al.,
       ``Squarified  treemaps'',  Proc.	Joint Eurographics and IEEE TCVG Symp.
       on Visualization, 2000, pp. 33-42). The clusters	of the graph are  used
       to specify the tree.

       osage draws the graph using its cluster structure. For a	given cluster,
       each of its subclusters is laid out internally.	Then the  subclusters,
       plus  any remaining nodes, are repositioned based on the	cluster's pack
       and packmode attributes.

OUTPUT FORMATS
       Graphviz	uses an	extensible plugin mechanism for	its output  renderers,
       so to see what output formats your installation of dot supports you can
       use ``dot -T:'' and check the warning message.  Also, The plugin	mecha-
       nism  supports multiple implementations of the output formats, allowing
       variations in the renderers and formatters.  To see what	 variants  are
       available  for  a  particular  output  format,  use, for	example: ``dot
       -Tpng:''	and to force a particular variant,  use,  for  example:	 ``dot
       -Tpng:gd''

       Traditionally, Graphviz supports	the following:
       -Tdot (Dot format containing layout infomation),
       -Txdot (Dot format containing complete layout infomation),
       -Tps (PostScript),
       -Tpdf (PDF),
       -Tsvg -Tsvgz (Structured	Vector Graphics),
       -Tfig (XFIG graphics),
       -Tpng (png bitmap graphics),
       -Tgif (gif bitmap graphics),
       -Tjpg -Tjpeg (jpeg bitmap graphics),
       -Tjson (xdot information	encoded	in JSON),
       -Timap (imagemap	files for httpd	servers	for each node or edge that has
       a non-null href attribute.),
       -Tcmapx (client-side imagemap for use in	html and xhtml).
       Additional less common or more special-purpose output  formats  can  be
       found at	//http://www.graphviz.org/content/output-formats.

       Alternative  plugins providing support for a given output format	can be
       found from the error message resulting from appending a ':' to the for-
       mat. e.g. -Tpng:	The first plugin listed	is always the default.

       The  -P	switch	can  be	used to	produce	a graph	of all output variants
       supported by plugins in the local installation of graphviz.

GRAPH FILE LANGUAGE
       Here is a synopsis of the graph file language, normally using  the  ex-
       tension .gv, for	graphs:

       [strict]	(graph|digraph)	name { statement-list }
       is the top-level	graph. If the graph is strict, then multiple edges are
       not allowed between the same pairs of  nodes.   If  it  is  a  directed
       graph,  indicated by digraph, then the edgeop must be "->". If it is an
       undirected graph	then the edgeop	must be	"--".

       Statements may be:

       name=val;
       node [name=val];
       edge [name=val];
       Set default graph, node,	or edge	attribute name to val.	Any  subgraph,
       node, or	edge appearing after this inherits the new default attributes.

       n0 [name0=val0,name1=val1,...]; Creates node n0 (if it does not already
       exist) and sets its attributes according	to the optional	list.

       n0 edgeop n1 edgeop ... edgeop nn [name0=val0,name1=val1,...];
       Creates edges between nodes n0, n1, ...,	nn and sets  their  attributes
       according to the	optional list.	Creates	nodes as necessary.

       [subgraph name] { statement-list	}
       Creates	a  subgraph.  Subgraphs	may be used in place of	n0, ..., nn in
       the above statements to create edges.  [subgraph	name] is optional;  if
       missing,	the subgraph is	assigned an internal name.

       The language accepts both C-style comments /*C...*/ or //...

       Attribute names and values are ordinary (C-style) strings.  The follow-
       ing sections describe attributes	that control graph layout.

       A  more	complete  description  of  the	language  can  be   found   at
       http://www.graphviz.org/content/dot-language.

GRAPH, NODE AND	EDGE ATTRIBUTES
       Graphviz	uses the name=value attributes,	attached to graphs, subgraphs,
       nodes and edges,	to tailor the layout and rendering. We list  the  more
       prominent   attributes	below.	The  complete  list  is	 available  at
       http://www.graphviz.org/content/attrs.

  Attributes Common to Nodes, Edges, Clusters and Graphs
       href=url	the default url	for image map files; in	PostScript files,  the
       base  URL for all relative URLs,	as recognized by Acrobat Distiller 3.0
       and up.

       URL=url (``URL''	is a synonym for ``href.'')

       fontcolor=colorvalue sets the label text	color.

       A colorvalue may	be  "h,s,v"  (hue,  saturation,	 brightness)  floating
       point  numbers  between	0  and	1, or an X11 color name	such as	white,
       black, red, green, blue,	yellow,	magenta, or cyan, or a "#rrggbb" (red,
       green,	  blue,	    2	  hex	 characters    each)	value.	   See
       http://www.graphviz.org/content/attrs#kcolor			   and
       http://www.graphviz.org/content/color-names for further details.

       fontsize=n sets the label type size to n	points.

       fontname=name sets the label font family	name.

       label=text  where  text	may include escaped newlines \n, \l, or	\r for
       center, left, and right justified lines.	 The string '\G' value will be
       replaced	 by  the  graph	 name.	For node labels, the string '\N' value
       will be replaced	by the node name.  For edges, if the substring '\T' is
       found  in a label, it will be replaced by the name of the tail node; if
       the substring '\H' is found in a	label, it will be replaced by the name
       of  the	head  node; if the substring '\E' value	is found in a label it
       will   be   replaced   by:   tail_node_name->head_node_name   or	   by:
       tail_node_name--head_node_name for undirected graphs.

       Graphviz	 also  supports	special	HTML-like labels for constructing com-
       plex  node  content.  A	full-description  of   these   is   given   at
       http://www.graphviz.org/content/node-shapes#html.

       If  a  node has shape=record, the label may contain recursive box lists
       delimited by { |	}.  Port identifiers in	labels are set	off  by	 angle
       brackets	< >.

  Graph	Attributes
       size="x,y" specifies the	maximum	bounding box of	drawing	in inches.

       ratio=f	sets  the aspect ratio to f which may be a floating point num-
       ber, or one of the keywords fill, compress, or auto.

       layout=engine indicates the preferred layout engine (dot,  neato,  fdp,
       etc.) overriding	the default from the basename of the command or	the -K
       commandline option.

       margin=f	sets the page margin (included in the page size).

       ordering=out constrains order of	out-edges in a subgraph	 according  to
       their file sequence.

       rotate=90  sets landscape mode.	(orientation=land is backward compati-
       ble but obsolete.)

       center=n	a non-zero value centers the drawing on	the page.

       color=colorvalue	sets foreground	color (bgcolor for background).

       overlap=mode. This specifies what algorithm  should  do	if  any	 nodes
       overlap.	 If mode is false, the program uses the	Prism algorithm	to ad-
       just the	nodes to eliminate overlaps. If	mode is	scale, the  layout  is
       uniformly scaled	up, preserving node sizes, until nodes no longer over-
       lap. The	latter technique removes overlaps  while  preserving  symmetry
       and structure, while the	former removes overlaps	more compactly but de-
       stroys symmetries.  If mode is true (the	default), no repositioning  is
       done.   Since  the  dot algorithm always	produces a layout with no node
       overlaps, this attribute	is only	useful with other layouts.

       stylesheet="file.css" includes a	reference to a stylesheet in -Tsvg and
       -Tsvgz outputs.	Ignored	by other formats.

       splines	If  set	 to true, edges	are drawn as splines.  If set to poly-
       line, edges are drawn as	polylines.  If set to ortho, edges  are	 drawn
       as  orthogonal  polylines.   In	all of these cases, the	nodes must not
       overlap.	 If splines=false or splines=line, edges  are  drawn  as  line
       segments.   The	default	 is true for dot, and false for	all other lay-
       outs.

       (dot-specific attributes)

       nodesep=f sets the minimum separation between nodes.

       ranksep=f sets the minimum separation between ranks.

       rankdir=LR|RL|BT	requests a left-to-right, right-to-left, or bottom-to-
       top, drawing.

       rank=same  (or min or max) in a subgraph	constrains the rank assignment
       of its nodes.   If a subgraph's name has	the prefix cluster, its	 nodes
       are  drawn  in  a  distinct  rectangle  of the layout.  Clusters	may be
       nested.

       (neato-specific attributes)
       mode=val.  Algorithm for	minimizing energy in the layout.  By  default,
       neato uses stress majorization. If mode=KK, it uses a version of	gradi-
       ent descent.

       model=val.  The neato model computes the	desired	distances between  all
       pairs of	vertices. By default, it uses the length of the	shortest path.
       If model	is set to circuit, a circuit-resistance	 model	is  used.   If
       model  is set to	subset,	it uses	a model	whereby	the edge length	is the
       number of nodes that are	neighbors of exactly one of  the  edge's  ver-
       tices.

       start=val.  Requests random initial placement and seeds the random num-
       ber generator.  If val is not an	integer, the  process  ID  or  current
       time is used as the seed.

       epsilon=n.  Sets	the cutoff for the solver.  The	default	is 0.1.

       (twopi-specific attributes)
       root=ctr.  This specifies the node to be	used as	the center of the lay-
       out. If not specified, twopi will randomly pick one of the  nodes  that
       are furthest from a leaf	node, where a leaf node	is a node of degree 1.
       If no leaf nodes	exists,	an arbitrary node is picked as center.

       ranksep=val. Specifies the radial distance in inches  between  the  se-
       quence of rings.	The default is 0.75.

       (circo-specific attributes)
       root=nodename.  Specifies  the  name  of	 a  node occurring in the root
       block. If the graph is disconnected, the	root  node  attribute  can  be
       used to specify additional root blocks.

       mindist=value.  Sets  the  minimum separation between all nodes.	If not
       specified then circo uses a default value of 1.0.

       (fdp-specific attributes)
       K=val. Sets the default ideal node separation in	the layout.

       maxiter=val. Sets the maximum number of iterations used to  layout  the
       graph.

       start=val. Adjusts the random initial placement of nodes	with no	speci-
       fied position.  If val is is an integer,	it is used as the seed for the
       random  number  generator.   If val is not an integer, a	random system-
       generated integer, such as the process ID or current time, is  used  as
       the seed.

  Node Attributes
       height=d	 or  width=d  sets  minimum  height  or	 width.	 Adding	fixed-
       size=true forces	these to be the	actual size (text labels are ignored).

       shape=builtin_polygon record epsf
       builtin_polygon can be such values as plaintext,	ellipse, oval, circle,
       egg,  triangle, box, diamond, trapezium,	parallelogram, house, hexagon,
       octagon,	note, tab, box3d, or component,, among others.	(Polygons  are
       defined	or modified by the following node attributes: regular, periph-
       eries, sides, orientation, distortion and skew.)	 epsf uses the	node's
       shapefile attribute as the path name of an external EPSF	file to	be au-
       tomatically loaded for the node shape.

       See http://www.graphviz.org/content/node-shapes for a complete descrip-
       tion of node shapes.

       color=colorvalue	 sets the outline color, and the default fill color if
       style=filled and	fillcolor is not specified.

       fillcolor=colorvalue sets the fill color	 when  style=filled.   If  not
       specified,  the	fillcolor when style=filled defaults to	be the same as
       the outline color.

       style=filled solid dashed dotted	bold invis

       xlabel="text" specifies a label that will be place near,	 but  outside,
       of a node. The normal label string is placed within the node shape.

       target="target"	is  a target string for	client-side imagemaps and SVG,
       effective when nodes have a URL.	 The target string is used  to	deter-
       mine  which  window  of the browser is used for the URL.	 Setting it to
       "_graphviz" will	open a new window if it	doesn't	already	exist, or  re-
       use it if it does.  If the target string	is empty, the default, then no
       target attribute	is included in the output.  The	 substrings  '\N'  and
       '\G'  are  substituted  in the same manner as for the node label	attri-
       bute.  Additionally the substring '\L' is substituted with the node la-
       bel string.

       tooltip="text"  is  a tooltip string for	client-side imagemaps and SVG,
       effective when nodes have a URL.	 The tooltip string defaults to	be the
       same  as	the label string, but this attribute permits nodes without la-
       bels to still have tooltips thus	permitting denser  graphs.   The  sub-
       strings	'\N'  and  '\G'	 are substituted in the	same manner as for the
       node label attribute.  Additionally the substring '\L'  is  substituted
       with the	node label string.

       The following attributes	apply only to polygon shape nodes:

       regular=n  if n is non-zero then	the polygon is made regular, i.e. sym-
       metric about the	x and y	axis, otherwise	the polygon takes on  the  as-
       pect ratio of the label.	 builtin_polygons that are not already regular
       are made	regular	by this	attribute.  builtin_polygons that are  already
       regular are not affected	(i.e.  they cannot be made asymmetric).

       peripheries=n sets the number of	periphery lines	drawn around the poly-
       gon.   This  value  supersedes  the  number  of	periphery   lines   of
       builtin_polygons.

       sides=n	sets the number	of sides to the	polygon. n<3 results in	an el-
       lipse.  This attribute is ignored by builtin_polygons.

       orientation=f sets the orientation of the first	apex  of  the  polygon
       counterclockwise	 from  the  vertical, in degrees.  f may be a floating
       point number.  The orientation of labels	is not affected	by this	attri-
       bute.	This   attribute  is  added  to	 the  initial  orientation  of
       builtin_polygons.

       distortion=f sets the amount of broadening of the top and narrowing  of
       the  bottom  of	the  polygon  (relative	to its orientation).  Floating
       point values between -1 and +1 are suggested.  This  attribute  is  ig-
       nored by	builtin_polygons.

       skew=f  sets  the amount	of right-displacement of the top and left-dis-
       placement of the	bottom of the polygon (relative	to  its	 orientation).
       Floating	 point values between -1 and +1	are suggested.	This attribute
       is ignored by builtin_polygons.

       (circo-specific attributes)
       root=true/false.	This specifies that the	 block	containing  the	 given
       node be treated as the root of the spanning tree	in the layout.

       (neato- and fdp-specific	attributes)
       pin=val.	If val is true,	the node will remain at	its initial position.

  Edge Attributes
       weight=val where	val is the cost	of the edge.  For dot, weights must be
       non-negative integers.  Values greater than 1 tend to shorten the edge;
       weight 0	flat edges are ignored for ordering nodes.  In twopi, a	weight
       of 0 will cause the edge	to be ignored in constructing  the  underlying
       spanning	tree. For neato	and fdp, a heavier weight will put more	empha-
       sis on the algorithm achieving an edge length closer to that  specified
       by the edge's len attribute.

       style=solid dashed dotted bold invis

       color=colorvalue	sets the line color for	edges.

       color=colorvaluelist  a ':' separated list of colorvalue	creates	paral-
       lel edges, one edge for each color.

       dir=forward back	both none controls arrow direction.

       tailclip,headclip=false disables	endpoint shape clipping.

       target="text" is	a target string	for client-side	imagemaps and SVG, ef-
       fective	when edges have	a URL.	If the target string is	empty, the de-
       fault, then no target attribute is included in the  output.   The  sub-
       strings '\T', '\H', '\E'	and '\G' are substituted in the	same manner as
       for the edge label attribute.  Additionally the substring '\L' is  sub-
       stituted	with the edge label string.

       tooltip="text"  is a tooltip string for client-side imagemaps effective
       when edges have a URL.  The tooltip string defaults to be the  same  as
       the  edge  label	 string.  The substrings '\T', '\H', '\E' and '\G' are
       substituted in the same manner as for the edge label attribute.	 Addi-
       tionally	the substring '\L' is substituted with the edge	label string.

       arrowhead,arrowtail=none, normal, inv, dot, odot, invdot, invodot, tee,
       empty, invempty,	open, halfopen,	diamond, odiamond,  box,  obox,	 crow.
       Specifies  the  shape of	the glyph occurring where the edge touches the
       head or tail node, respectively.	Note  that  this  only	specifies  the
       shape. The dir attribute	determines whether or not the glyph is drawn.

       arrowsize=val  specifies	 a multiplicative scale	factor for the size of
       the arrowhead.  inv_length=6,inv_width=7,dot_radius=2)

       headlabel,taillabel=text	for labels appearing near the  head  and  tail
       nodes  of  an  edge.   labelfontcolor, labelfontname, labelfontsize for
       head and	tail labels.  The substrings '\T', '\H',  '\E'	and  '\G'  are
       substituted  in the same	manner as for the edge label attribute.	 Addi-
       tionally	the substring '\L' is substituted with the edge	label string.

       headhref="url" sets the url for the head	port in	 imagemap,  PostScript
       and  SVG	 files.	  The substrings '\T', '\H', '\E' and '\G' are substi-
       tuted in	the same manner	as for the edge	label attribute.  Additionally
       the substring '\L' is substituted with the edge label string.

       headURL="url" (headURL is a synonym for headhref.)

       headtarget="headtarget"	is  a  target string for client-side imagemaps
       and SVG,	effective when edge heads have a URL.  The  headtarget	string
       is  used	 to determine which window of the browser is used for the URL.
       If the headtarget string	is empty, the  default,	 then  headtarget  de-
       faults  to the same value as target for the edge.  The substrings '\T',
       '\H', '\E' and '\G' are substituted in the same manner as for the  edge
       label  attribute.   Additionally	the substring '\L' is substituted with
       the edge	label string.

       headtooltip="tooltip" is	a tooltip string for client-side imagemaps ef-
       fective	when head ports	have a URL.  The tooltip string	defaults to be
       the same	as the headlabel string.  The substrings '\T', '\H', and  '\E'
       are  substituted	 in  the  same manner as for the edge label attribute.
       Additionally the	substring '\L' is  substituted	with  the  edge	 label
       string.

       tailhref="url"  sets  the url for the tail port in imagemap, PostScript
       and SVG files.  The substrings '\T', '\H', '\E' and  '\G'  are  substi-
       tuted in	the same manner	as for the edge	label attribute.  Additionally
       the substring '\L' is substituted with the edge label string.

       tailURL="url" (tailURL is a synonym for tailhref.)

       tailtarget="tailtarget" is a target string  for	client-side  imagemaps
       and  SVG,  effective when edge tails have a URL.	 The tailtarget	string
       is used to determine which window of the	browser	is used	for  the  URL.
       If  the	tailtarget  string  is empty, the default, then	tailtarget de-
       faults to the same value	as target for the edge.	 The substrings	 '\T',
       '\H',  '\E' and '\G' are	substituted in the same	manner as for the edge
       label attribute.	 Additionally the substring '\L' is  substituted  with
       the edge	label string.

       tailtooltip="tooltip" is	a tooltip string for client-side imagemaps ef-
       fective when tail ports have a URL.  The	tooltip	string defaults	to  be
       the  same as the	taillabel string.  The substrings '\T',	'\H', '\E' and
       '\G' are	substituted in the same	manner as for the  edge	 label	attri-
       bute.  Additionally the substring '\L' is substituted with the edge la-
       bel string.

       labeldistance and labelangle (in	degrees	CCW) specify the placement  of
       head and	tail labels.

       decorate	draws line from	edge to	label.

       samehead,sametail aim edges having the same value to the	same port, us-
       ing the average landing point.

       (dot-specific attributes)
       constraint=false	causes an edge to be ignored for rank assignment.

       minlen=n	where n	is an integer factor that applies to the  edge	length
       (ranks for normal edges,	or minimum node	separation for flat edges).

       xlabel="text" Edge labels in dot	are treated as special types of	nodes,
       with space allocated for	them during node layout.  This	can  sometimes
       deform  the  edge  routing.  If an xlabel is used instead, the label is
       placed after all	nodes and edges	have been positioned.  In  turn,  this
       may mean	that there is some overlap among the labels.

       (neato and fdp-specific attributes)
       len=f sets the optimal length of	an edge.  The default is 1.0.

COMMAND-LINE OPTIONS
       -G sets a default graph attribute.
       -N sets a default node attribute.
       -E  sets	 a  default edge attribute.  Example: -Gsize="7,8" -Nshape=box
       -Efontsize=8

       -lfile loads custom PostScript library  files.	Usually	 these	define
       custom  shapes  or  styles.  If -l is given by itself, the standard li-
       brary is	omitted.

       -Tlang sets the output language as described above.

       -n[1|2] (no-op) If set, neato assumes nodes  have  already  been	 posi-
       tioned  and  all	 nodes	have a pos attribute giving the	positions.  It
       then performs an	optional adjustment to remove node-node	 overlap,  de-
       pending	on  the	value of the overlap attribute,	computes the edge lay-
       outs, depending on the value of the splines attribute,  and  emits  the
       graph in	the appropriate	format.	 If num	is supplied, the following ac-
       tions occur:
	   num = 1
       Equivalent to -n.
	   num > 1
       Use node	positions as specified,	with no	adjustment to remove node-node
       overlaps,  and use any edge layouts already specified by	the pos	attri-
       bute.  neato computes an	edge layout for	any edge that does not have  a
       pos  attribute.	 As usual, edge	layout is guided by the	splines	attri-
       bute.

       -Klayout	override the default layout  engine  implied  by  the  command
       name.

       -O  automatically generate output filenames based on the	input filename
       and the -T format.

       -P generate a graph of the currently available plugins.

       -v (verbose) prints various information useful for debugging.

       -c configure plugins.

       -m memory test (observe no growth with top, kill	when done).

       -qlevel set level of message suppression. The default is	1.

       -sfscale	scale input by fscale, the default is 72.

       -y invert y coordinate in output.

       -V (version) prints version information and exits.

       -? prints the usage and exits.

       A complete description of the available	command-line  options  can  be
       found at	http://www.graphviz.org/content/command-line-invocation.

EXAMPLES
       digraph test123 {
	       a -> b -> c;
	       a -> {x y};
	       b [shape=box];
	       c [label="hello\nworld",color=blue,fontsize=24,
		    fontname="Palatino-Italic",fontcolor=red,style=filled];
	       a -> z [label="hi", weight=100];
	       x -> z [label="multi-line\nlabel"];
	       edge [style=dashed,color=red];
	       b -> x;
	       {rank=same; b x}
       }

       graph test123 {
	       a -- b -- c;
	       a -- {x y};
	       x -- c [w=10.0];
	       x -- y [w=5.0,len=3];
       }

CAVEATS
       Edge splines can	overlap	unintentionally.

       Flat edge labels	are slightly broken.  Intercluster edge	labels are to-
       tally broken.

       Because unconstrained optimization is employed, node boxes can possibly
       overlap	or  touch unrelated edges.  All	existing spring	embedders seem
       to have this limitation.

       Apparently reasonable attempts to pin nodes or adjust edge lengths  and
       weights can cause instability.

AUTHORS
       Stephen C. North	<north@research.att.com>
       Emden R.	Gansner	<erg@graphviz.org>
       John C. Ellson <ellson@research.att.com>
       Yifan Hu	<yifanhu@yahoo.com>

       The   bitmap   driver   (PNG,   GIF   etc)   is	 by   Thomas  Boutell,
       <http://www.boutell.com/gd>

       The Truetype font renderer is from the Freetype Project (David  Turner,
       Robert	Wilhelm,   and	Werner	Lemberg)  (who	can  be	 contacted  at
       freetype-devel@lists.lrz-muenchen.de).

SEE ALSO
       This man	page contains only a small amount of the  information  related
       to  the	Graphviz layout	programs. The most complete information	can be
       found at	http://www.graphviz.org/Documentation.php, especially  in  the
       on-line	reference pages. Most of these documents are also available in
       the doc and doc/info subtrees in	the source and binary distributions.

       dotty(1)
       tcldot(n)
       xcolors(1)
       libcgraph(3)

       E. R. Gansner, S. C. North,  K. P. Vo, "DAG - A	Program	 to  Draw  Di-
       rected  Graphs",	 Software  -  Practice and Experience 17(1), 1988, pp.
       1047-1062.
       E. R. Gansner, E. Koutsofios, S.	C. North,  K. P. Vo, "A	Technique  for
       Drawing	Directed  Graphs,"  IEEE Trans.	on Soft. Eng. 19(3), 1993, pp.
       214-230.
       S. North	and E.	Koutsofios,  "Applications  of	graph  visualization",
       Graphics	Interface 94, pp. 234-245.
       E.  R.  Gansner and E. Koutsofios and S.	C. North, "Drawing Graphs with
       dot," Available at http://www.graphviz.org/pdf/dotguide.pdf.
       S.     C.     North,	"NEATO	   User's     Manual".	     Available
       http://www.graphviz.org/pdf/neatoguide.pdf.
       E.  R. Gansner and Y. Hu, "Efficient, Proximity-Preserving Node Overlap
       Removal", J. Graph Algorithms Appl., 14(1) pp. 53-74, 2010.

				12 January 2015				DOT(1)

NAME | SYNOPSIS | DESCRIPTION | OUTPUT FORMATS | GRAPH FILE LANGUAGE | GRAPH, NODE AND EDGE ATTRIBUTES | COMMAND-LINE OPTIONS | EXAMPLES | CAVEATS | AUTHORS | SEE ALSO

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