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DOT(1)									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
       extension .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
       adjust 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
       destroys	 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  bot-
       tom-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
       sequence	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  sys-
       tem-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
       automatically 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
       attribute.  Additionally	the substring '\L'  is	substituted  with  the
       node label 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
       labels 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
       aspect ratio of the label.  builtin_polygons that are not already regu-
       lar are made regular by	this  attribute.   builtin_polygons  that  are
       already	regular	 are  not affected (i.e.  they cannot be made asymmet-
       ric).

       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
       ellipse.	 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
       attribute.  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
       ignored 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,
       effective  when	edges  have a URL.  If the target string is empty, the
       default,	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
       defaults	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
       effective 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
       defaults	 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
       effective  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
       attribute.  Additionally	the substring '\L'  is	substituted  with  the
       edge label 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,
       using 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
       library 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,
       depending 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
       actions 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
       attribute.   neato  computes  an	edge layout for	any edge that does not
       have a pos attribute.  As usual,	edge layout is guided by  the  splines
       attribute.

       -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
       totally 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
       Directed	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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