All Graphviz attributes are specified by name-value pairs. Thus, to
set the fillcolor of a node abc, one would use
- Damping
- Factor damping force motions. On each iteration, a nodes movement
is limited to this factor of its potential motion. By being less than
1.0, the system tends to ``cool'', thereby preventing cycling.
- K
- Spring constant used in virtual physical model. It roughly corresponds
to an ideal edge length (in inches), in that increasing K tends to
increase the distance between nodes.
Note that the edge attribute len can be used to
override this value for adjacent nodes.
- URL
- Hyperlinks incorporated into device-dependent output.
At present, used in ps2, cmap, i*map and svg formats.
For all these formats, URLs can be attached to nodes, edges and
clusters. URL attributes can also be attached to the root graph in ps2,
cmap and i*map formats. This serves as the base URL for relative URLs in the
former, and as the default image map file in the latter.
For svg, cmapx and imap output, the active area for a node is its
visible image.
For example, an unfilled
node with no drawn boundary will only be active on its label.
For other output, the active area is its bounding box.
The active area for a cluster is its bounding box.
For edges, the active areas are small circles where the edge contacts its head
and tail nodes. In addition, for svg, cmapx and imap, the active area
includes a thin polygon approximating the edge. The circles may
overlap the related node, and the edge URL dominates.
If the edge has a label, this will also be active.
Finally, if the edge has a head or tail label, this will also be active.
Note that, for edges, the attributes headURL,
tailURL, labelURL and
edgeURL allow control of various parts of an
edge.
Also note that, if active areas of two edges overlap, it is unspecified
which area dominates.
- arrowhead
- Style of arrowhead on the head node of an edge.
This will only appear if the dir attribute
is "forward" or "both".
See the limitation.
- arrowsize
- Multiplicative scale factor for arrowheads.
- arrowtail
- Style of arrowhead on the tail node of an edge.
This will only appear if the dir attribute
is "back" or "both".
See the limitation.
- aspect
- Target aspect ratio (width of the layout divided by the height)
of the graph drawing. If unset, dot minimizes the total edge length.
For certain graphs, like those with large fan-in or fan-out, this can
lead to very wide layouts. Setting aspect will cause dot to try
to adjust the layout to get an aspect ratio close to that specified
by aspect.
By default, dot will do 5 passes attempting to achieve the desired
aspect ratio. For certain graphs, more passes will be needed to get
close enough. The aspect attribute can also be used to
specify the maximum number of passes to try.
At present, there is no mechanism for widening a very tall layout.
Also, the algorithm doesn't handle clusters, nor disconnected graphs.
For the latter case, one can split the pipeline
ccomps -x | dot | gvpack | neato -n2
to get a similar effect.
- bb
- Bounding box of drawing in points.
- bgcolor
- When attached to the root graph, this color is used as the background for
entire canvas. When a cluster attribute, it is used as the initial
background for the cluster. If a cluster has a filled
style, the
cluster's fillcolor will overlay the
background color.
If no background color is specified for the root graph, no graphics
operation are performed on the background. This works fine for
PostScript but for bitmap output, all bits are initialized to something.
This means that when the bitmap output is included in some other
document, all of the bits within the bitmap's bounding box will be
set, overwriting whatever color or graphics where already on the page.
If this effect is not desired, and you only want to set bits explicitly
assigned in drawing the graph, set bgcolor="transparent".
- center
- If true, the drawing is centered in the output canvas.
- charset
- Specifies the character encoding used when interpreting string input
as a text label. The default value is "UTF-8".
The other legal value is "iso-8859-1" or,
equivalently,
"Latin1". The charset attribute is case-insensitive.
Note that if the character encoding used in the input does not
match the charset value, the resulting output may be very strange.
- clusterrank
- Mode used for handling clusters. If clusterrank is "local", a
subgraph whose name begins with "cluster" is given special treatment.
The subgraph is laid out separately, and then integrated as a unit into
its parent graph, with a bounding rectangle drawn about it.
If the cluster has a label parameter, this label
is displayed within the rectangle.
Note also that there can be clusters within clusters.
At present, the modes "global" and "none"
appear to be identical, both turning off the special cluster processing.
- color
- Basic drawing color for graphics, not text. For the latter, use the
fontcolor attribute.
For edges, the value
can either be a single color or a colorList.
In the latter case, the edge is drawn using parallel splines or lines,
one for each color in the list, in the order given.
The head arrow, if any, is drawn using the first color in the list,
and the tail arrow, if any, the second color. This supports the common
case of drawing opposing edges, but using parallel splines instead of
separately routed multiedges. For example, the graph
digraph G {
a -> b [dir=both color="red:blue"]
}
yields
- colorscheme
- This attribute specifies a color scheme namespace. If defined, it specifies
the context for interpreting color names. In particular, if a
color value has form "xxx" or "//xxx",
then the
color xxx will be evaluated according to the current color scheme.
If no color scheme is set, the standard X11 naming is used.
For example, if colorscheme=bugn9, then color=7
is interpreted as "/bugn9/7".
- comment
- Comments are inserted into output. Device-dependent
- compound
- If true, allow edges between clusters. (See lhead
and ltail below.)
- concentrate
- If true, use edge concentrators.
This merges multiedges into a single edge and causes partially parallel
edges to share part of their paths. The latter feature is not yet available
outside of dot.
- constraint
- If false, the edge is not used in ranking the nodes. For example,
in the graph
digraph G {
a -> c;
a -> b;
b -> c [constraint=false];
}
the edge b -> c does not add a constraint during rank
assignment, so the only constraints are that a be above b and c,
yielding the graph:
- decorate
- If true, attach edge label to edge by a 2-segment
polyline, underlining the label, then going to the closest point of spline.
- defaultdist
- This specifies the distance between nodes in separate connected
components. If set too small, connected components may overlap.
Only applicable if pack=false.
- dim
- Set the number of dimensions used for the layout. The maximum value
allowed is 10.
- dimen
- Set the number of dimensions used for rendering.
The maximum value allowed is 10.
If both dimen and dim are set, the latter specifies
the dimension used for layout, and the former for rendering.
If only dimen is set, this is used for both layout and rendering
dimensions.
- dir
- Set edge type for drawing arrowheads. This indicates which ends of the
edge should be decorated with an arrowhead. The actual style of the
arrowhead can be specified using the arrowhead
and arrowtail attributes.
See limitation.
- diredgeconstraints
- Only valid when mode="ipsep".
If true, constraints are generated for each edge in the largest (heuristic)
directed acyclic subgraph such that the edge must point downwards.
If "hier", generates level constraints similar to those used with
mode="hier". The main difference is that, in the latter
case, only these constraints are involved, so a faster solver can be used.
- distortion
- Distortion factor for shape=polygon.
Positive values cause top part to
be larger than bottom; negative values do the opposite.
- dpi
- This specifies the expected number of pixels per inch on a display device.
For bitmap output, this guarantees that text rendering will be
done more accurately, both in size and in placement. For SVG output,
it is used to guarantee that the dimensions in the output correspond to
the correct number of points or inches.
- edgeURL
- If edgeURL is defined, this is the link used for the non-label
parts of an edge. This value overrides any URL
defined for the edge.
Also, this value is used near the head or tail node unless overridden
by a headURL or tailURL value,
respectively.
See limitation.
- edgehref
- Synonym for edgeURL.
- edgetarget
- If the edge has a URL or edgeURL
attribute, this attribute determines which window of the
browser is used
for the URL attached to the non-label part of the edge.
Setting it to "_graphviz" will open a new window if it
doesn't already exist, or reuse it if it does.
If undefined, the value of the target is used.
- edgetooltip
- Tooltip annotation attached to the non-label part of an edge.
This is used only if the edge has a URL
or edgeURL attribute.
- epsilon
- Terminating condition. If the length squared of all energy gradients are
< epsilon, the algorithm stops.
- esep
- Margin used around polygons for purposes of spline edge routing.
The interpretation is the same as given for sep.
This should normally be strictly less than sep.
- fillcolor
- Color used to fill the background of a node or cluster
assuming style=filled.
If fillcolor is not defined, color is
used. (For clusters, if color is not defined,
bgcolor is used.) If this is not defined,
the default is used, except for
shape=point or when the output
format is MIF,
which use black by default.
Note that a cluster inherits the root graph's attributes if defined.
Thus, if the root graph has defined a fillcolor, this will override a
color or bgcolor attribute set for the cluster.
- fixedsize
- If true, the node size is specified by the values of the
width
and height attributes only
and is not expanded to contain the text label.
- fontcolor
- Color used for text.
- fontname
- Font used for text. This very much depends on the output format and, for
non-bitmap output such as PostScript or SVG, the availability of the font
when the graph is displayed or printed. As such, it is best to rely on
font faces that are generally available, such as Times-Roman, Helvetica or
Courier.
If Graphviz was built using the
fontconfig library, the latter library
will be used to search for the font. However, if the fontname string
contains a slash character "/", it is treated as a pathname for the font
file, though font lookup will append the usual font suffixes.
If Graphviz does not use fontconfig, fontname will be
considered the name of a Type 1 or True Type font file.
If you specify fontname=schlbk, the tool will look for a
file named schlbk.ttf or schlbk.pfa or schlbk.pfb
in one of the directories specified by
the fontpath attribute.
The lookup does support various aliases for the common fonts.
- fontnames
- Allows user control of how basic fontnames are represented in SVG output.
If fontnames is undefined or "svg",
the output will try to use known SVG fontnames. For example, the
default font "Times-Roman" will be mapped to the
basic SVG font "serif". This can be overridden by setting
fontnames to "ps" or "gd".
In the former case, known PostScript font names such as
"Times-Roman" will be used in the output.
In the latter case, the fontconfig font conventions
are used. Thus, "Times-Roman" would be treated as
"Nimbus Roman No9 L". These last two options are useful
with SVG viewers that support these richer fontname spaces.
- fontpath
- Directory list used by libgd to search for bitmap fonts if Graphviz
was not built with the fontconfig library.
If fontpath is not set, the environment
variable DOTFONTPATH is checked.
If that is not set, GDFONTPATH is checked.
If not set, libgd uses its compiled-in font path.
Note that fontpath is an attribute of the root graph.
- fontsize
- Font size, in points, used for text.
- group
- If the end points of an edge belong to the same group, i.e., have the
same group attribute, parameters are set to avoid crossings and keep
the edges straight.
- headURL
- If headURL is defined, it is
output as part of the head label of the edge.
Also, this value is used near the head node, overriding any
URL value.
See limitation.
- headclip
- If true, the head of an edge is clipped to the boundary of the head node;
otherwise, the end of the edge goes to the center of the node, or the
center of a port, if applicable.
- headhref
- Synonym for headURL.
- headlabel
- Text label to be placed near head of edge.
See limitation.
- headport
- Indicates where on the head node to attach the head of the edge.
In the default case, the edge is aimed towards the center of the node,
and then clipped at the node boundary.
See limitation.
- headtarget
- If the edge has a headURL,
this attribute determines 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 reuse it if it does.
If undefined, the value of the target is used.
- headtooltip
- Tooltip annotation attached to the head of an edge. This is used only
if the edge has a headURL attribute.
- height
- Height of node, in inches. This is taken as the initial, minimum height
of the node. If fixedsize is true, this
will be the final height of the node. Otherwise, if the node label
requires more height to fit, the node's height will be increased to
contain the label. Note also that, if the output format is dot, the
value given to height will be the final value.
- href
- Synonym for URL.
- id
- Allows the graph author to provide an id for graph objects which is to be included in the output.
Normal "N", "E", "G" substitutions are applied.
If provided, it is the reponsiblity of the provider to keep
its values sufficiently unique for its intended downstream use.
Note, in particular, that "E" does not provide a unique id for multi-edges.
If no id attribute is provided, then a unique internal id is used, however this value is unpredictable by the graph writer.
An externally provided id is not used internally.
- image
- Gives the name of a file containing an image to be displayed inside
a node. The image file must be in one of the recognized
formats,
typically JPEG, PNG, GIF or Postscript, and be able to be converted
into the desired output format.
Unlike with the shapefile attribute,
the image is treated as node
content rather than the entire node. In particular, an image can
be contained in a node of any shape, not just a rectangle.
- imagescale
- Attribute controlling how an image fills its
containing node. In general, the image is given its natural size,
(cf. dpi),
and the node size is made large enough to contain its image, its
label, its margin, and its peripheries.
Its width and height will also be at least as large as its
minimum width and height.
If, however, fixedsize=true,
the width and height attributes specify the exact size of the node.
During rendering, in the default case (imagescale=false),
the image retains its natural size.
If imagescale=true,
the image is uniformly scaled (i.e., its aspect ratio is
preserved) to fit inside the node.
At least one dimension of the image will be as large as possible
given the size of the node.
When imagescale=width,
the width of the image is scaled to fill the node width.
The corresponding property holds when imagescale=height.
When imagescale=both,
both the height and the width are scaled separately to fill the node.
In all cases, if a dimension of the image is larger than the
corresponding dimension of the node, that dimension of the
image is scaled down to fit the node. As with the case of
expansion, if imagescale=true, width and height are
scaled uniformly.
- label
- Text label attached to objects.
If a node's shape is record, then the label can
have a special format
which describes the record layout.
- labelURL
- If labelURL is defined, this is the link used for the label
of an edge. This value overrides any URL
defined for the edge.
- labelangle
- This, along with labeldistance, determine
where the
headlabel (taillabel) are placed with respect to the head (tail)
in polar coordinates. The origin in the coordinate system is
the point where the edge touches the node. The ray of 0 degrees
goes from the origin back along the edge, parallel to the edge
at the origin.
The angle, in degrees, specifies the rotation from the 0 degree ray,
with positive angles moving counterclockwise and negative angles
moving clockwise.
- labeldistance
- Multiplicative scaling factor adjusting the distance that
the headlabel(taillabel) is from the head(tail) node.
The default distance is 10 points. See labelangle
for more details.
- labelfloat
- If true, allows edge labels to be less constrained in position.
In particular, it may appear on top of other edges.
- labelfontcolor
- Color used for headlabel and taillabel.
If not set, defaults to edge's fontcolor.
- labelfontname
- Font used for headlabel and taillabel.
If not set, defaults to edge's fontname.
- labelfontsize
- Font size, in points, used for headlabel and taillabel.
If not set, defaults to edge's fontsize.
- labelhref
- Synonym for labelURL.
- labeljust
- Justification for cluster labels. If "r", the label
is right-justified within bounding rectangle; if "l", left-justified;
else the label is centered.
Note that a subgraph inherits attributes from its parent. Thus, if
the root graph sets labeljust to "l", the subgraph inherits
this value.
- labelloc
- Vertical placement of labels for nodes, root graphs and clusters.
For graphs and clusters, only "t" and "b" are allowed, corresponding
to placement at the top and bottom, respectively.
By default, root
graph labels go on the bottom and cluster labels go on the top.
Note that a subgraph inherits attributes from its parent. Thus, if
the root graph sets labelloc to "b", the subgraph inherits
this value.
For nodes, this attribute is used only when the height of the node
is larger than the height of its label.
If labelloc is set to "t", "c", or "b", the label is aligned
with the top, centered, or aligned with the bottom of the node, respectively.
In the default case, the label is vertically centered.
- labeltarget
- If the edge has a URL or labelURL
attribute, this attribute determines which window of the
browser is used
for the URL attached to the label.
Setting it to "_graphviz" will open a new window if it
doesn't already exist, or reuse it if it does.
If undefined, the value of the target is used.
- labeltooltip
- Tooltip annotation attached to label of an edge.
This is used only if the edge has a URL
or labelURL attribute.
- landscape
- If true, the graph is rendered in landscape mode. Synonymous with
rotate=90 or
orientation=landscape.
- layer
- Specifies layers in which the node or edge is present.
- layers
- Specifies a linearly ordered list of layer names attached to the graph
The graph is then output in separate layers. Only those components
belonging to the current output layer appear. For more information,
see the page How to use drawing layers (overlays).
- layersep
- Specifies the separator characters used to split the
layers attribute into a list of layer names.
- layout
- Specifies the name of the layout algorithm to use, such as "dot"
or "neato". Normally, graphs should be kept independent of a type of
layout. In some cases, however, it can be convenient to embed the type
of layout desired within the graph. For example, a graph containing
position information from a layout might want to record what the
associated layout algorithm was.
This attribute takes precedence over
the -K flag
or the actual command name used.
- len
- Preferred edge length, in inches.
- levels
- Number of levels allowed in the multilevel scheme.
- levelsgap
- Specifies strictness of level constraints in neato
when mode="ipsep" or "hier".
Larger positive values mean stricter constraints, which demand more
separation between levels. On the other hand, negative values will relax
the constraints by allowing some overlap between the levels.
- lhead
- Logical head of an edge. When compound is true,
if lhead is defined and is the name of a cluster containing
the real head,
the edge is clipped to the boundary of the cluster.
See limitation.
- lp
- Label position, in points.
The position indicates the center of the label.
- ltail
- Logical tail of an edge. When compound is true,
if ltail is defined and is the name of a cluster
containing the real tail,
the edge is clipped to the boundary of the cluster.
See limitation.
- margin
- For graphs, this sets x and y margins of canvas, in inches. If the margin
is a single double, both margins are set equal to the given value.
Note that the margin is not part of the drawing but just empty space
left around the drawing. It basically corresponds to a translation of
drawing, as would be necessary to center a drawing on a page. Nothing
is actually drawn in the margin. To actually extend the background of
a drawing, see the pad attribute.
For nodes, this attribute specifies space left around the node's label.
By default, the value is 0.11,0.055.
- maxiter
- Sets the number of iterations used.
- mclimit
- Multiplicative scale factor used to alter the MinQuit (default = 8)
and MaxIter (default = 24) parameters used during crossing
minimization. These correspond to the
number of tries without improvement before quitting and the
maximum number of iterations in each pass.
- mindist
- Specifies the minimum separation between all nodes.
- minlen
- Minimum edge length (rank difference between head and tail).
- mode
- Technique for optimizing the layout. If mode is "major",
neato uses stress majorization. If mode is "KK",
neato uses a version of the gradient descent method. The only advantage
to the latter technique is that it is sometimes appreciably faster for
small (number of nodes < 100) graphs. A significant disadvantage is that
it may cycle.
There are two new, experimental modes in neato, "hier", which adds a top-down
directionality similar to the layout used in dot, and "ipsep", which
allows the graph to specify minimum vertical and horizontal distances
between nodes. (See the sep attribute.)
- model
- This value specifies how the distance matrix is computed for the input
graph. The distance matrix specifies the ideal distance between every
pair of nodes. neato attemps to find a layout which best achieves
these distances. By default, it uses the length of the shortest path,
where the length of each edge is given by its len
attribute. If model is "circuit", neato uses the
circuit resistance
model to compute the distances. This tends to emphasize clusters. If
model is "subset", neato uses the subset model. This sets the
edge length to be the number of nodes that are neighbors of exactly one
of the end points, and then calculates the shortest paths. This helps
to separate nodes with high degree.
For more control of distances, one can use model=mds. In this
case, the len of an edge is used as the ideal distance
between its vertices. A shortest path calculation is only used for
pairs of nodes not connected by an edge. Thus, by supplying a complete
graph, the input can specify all of the relevant distances.
- mosek
- If Graphviz is built with MOSEK defined, mode=ipsep and mosek=true,
the Mosek software (www.mosek.com) is use to solve the ipsep constraints.
- nodesep
- Minimum space between two adjacent nodes in the same rank, in inches.
- nojustify
- By default, the justification of multi-line labels is done within the
largest context that makes sense. Thus, in the label of a polygonal
node, a left-justified line will align with the left side of the node
(shifted by the prescribed margin).
In record nodes, left-justified
line will line up with the left side of the enclosing column of fields.
If nojustify is "true", multi-line labels will be justified
in the context of itself. For example, if the attribute is set,
the first label line is long, and the second is shorter and left-justified,
the second will align with the left-most character in the first line,
regardless of how large the node might be.
- normalize
- If set, normalize coordinates of final
layout so that the first point is at the origin, and then rotate the
layout so that the first edge is horizontal.
- nslimit
,
- nslimit1
- Used to set number of iterations in
network simplex applications. nslimit is used in
computing node x coordinates, nslimit1 for ranking nodes.
If defined, # iterations = nslimit(1) * # nodes;
otherwise, # iterations = MAXINT.
- ordering
- If "out" for a graph G, and n is a node in G, then edges n->* appear
left-to-right in the same order in which they are defined.
If "in", the edges *->n appear
left-to-right in the same order in which they are defined for all
nodes n.
- orientation
- Angle, in degrees, used to rotate polygon node shapes. For any number of polygon sides, 0 degrees rotation results in a flat base.
- orientation
- If "[lL]*", set graph orientation to landscape
Used only if rotate is not defined.
- outputorder
- Specify order in which nodes and edges are drawn.
- overlap
- Determines if and how node overlaps should be removed. Nodes are first
enlarged using the sep attribute.
If "true" , overlaps are retained.
If the value is "scale", overlaps are removed by uniformly scaling in x and y.
If the value converts to "false", node overlaps are removed by a
Voronoi-based technique.
If the value is "scalexy", x and y are separately
scaled to remove overlaps.
If sfdp is available, one can set overlap to "prism" to use a
proximity graph-based algorithm for overlap removal.
This is the preferred technique,
though "scale" and "false" can work well with small graphs.
This technique starts with a
small scaling up, controlled by the
overlap_scaling attribute,
which can remove a significant portion of the overlap.
The prism option also accepts an optional non-negative integer suffix.
This can be used to control the number of attempts made at overlap
removal. By default, overlap="prism" is equivalent to
overlap="prism1000". Setting overlap="prism0"
causes only the scaling phase to be run.
If the value is "compress", the layout will be scaled down as much as
possible without introducing any overlaps, obviously assuming there are
none to begin with.
N.B.The remaining allowed values of overlap
correspond to algorithms which, at present, can produce bad aspect ratios.
In addition, we deprecate the use of the "ortho*" and "portho*".
If the value is "vpsc", overlap removal is done as a
quadratic optimization to minimize node displacement while removing
node overlaps.
If the value is "orthoxy" or "orthoyx", overlaps
are moved by optimizing two constraint problems, one for the x axis and
one for the y. The suffix indicates which axis is processed first.
If the value is "ortho", the technique is similar to "orthoxy" except a
heuristic is used to reduce the bias between the two passes.
If the value is "ortho_yx", the technique is the same as "ortho", except
the roles of x and y are reversed.
The values "portho", "porthoxy", "porthoxy", and "portho_yx" are similar
to the previous four, except only pseudo-orthogonal ordering is
enforced.
If the layout is done by neato with mode="ipsep",
then one can use overlap=ipsep.
In this case, the overlap removal constraints are
incorporated into the layout algorithm itself.
N.B. At present, this only supports one level of clustering.
Except for fdp and sfdp, the layouts assume overlap="true" as the default.
Fdp first uses a number of passes using built-in, force-directed technique
to remove overlaps. Thus, fdp accepts overlap with an integer
prefix followed by a colon, specifying the number of tries. If there is
no prefix, no initial tries will be performed. If there is nothing following
a colon, none of the above methods will be attempted. By default, fdp
uses overlap="9:portho". Note that overlap="true",
overlap="0:true" and overlap="0:" all turn off all overlap
removal.
By default, sfdp uses overlap="prism0".
Except for the Voronoi and prism methods, all of these transforms preserve the
orthogonal ordering of the original layout. That is, if the x coordinates
of two nodes are originally the same, they will remain the same, and if
the x coordinate of one node is originally less than the x coordinate of
another, this relation will still hold in the transformed layout. The
similar properties hold for the y coordinates.
This is not quite true for the "porth*" cases. For these, orthogonal
ordering is only preserved among nodes related by an edge.
- overlap_scaling
- When overlap=prism, the layout is scaled by this factor, thereby
removing a fair amount of node overlap, and making node overlap removal
faster and better able to retain the graph's shape.
If overlap_scaling is negative, the layout is scaled by
-1*overlap_scaling times the average label size.
If overlap_scaling is positive, the layout is scaled by
overlap_scaling.
If overlap_scaling is zero, no scaling is done.
- pack
- This is true if the value of pack is "true" (case-insensitive) or a
non-negative integer. If true, each connected component of the graph is
laid out separately, and then the graphs are packed together.
If pack has an integral value, this is used as the size,
in points, of
a margin around each part; otherwise, a default margin of 8 is used.
If pack is interpreted as false, the entire graph is laid out together.
The granularity and method of packing is influenced by the
packmode attribute.
For layouts which always do packing, such a twopi, the pack
attribute is just used to set the margin.
- packmode
- This indicates how connected components should be packed
(cf. packMode). Note that defining
packmode will automatically turn on packing as though one had
set pack=true.
- pad
- The pad attribute specifies how much, in inches, to extend the
drawing area around the minimal area needed to draw the graph.
If the pad is a single double, both the x and y pad values are set
equal to the given value. This area is part of the
drawing and will be filled with the background color, if appropriate.
Normally, a small pad is used for aesthetic reasons, especially when
a background color is used, to avoid having nodes and edges abutting
the boundary of the drawn region.
- page
- Width and height of output pages, in inches. If only a single value
is given, this is used for both the width and height.
If this is set and is
smaller than the size of the layout, a rectangular array of pages of
the specified page size is overlaid on the layout, with origins
aligned in the lower-left corner, thereby partitioning the layout
into pages. The pages are then produced one at a time, in
pagedir order.
At present, this only works for PostScript output. For other types of
output, one should use another tool to split the output into multiple
output files. Or use the viewport to generate
multiple files.
- pagedir
- If the page attribute is set and applicable,
this attribute specifies the order in which the pages are emitted.
This is limited to one of the 8 row or column major orders.
- pencolor
- Color used to draw the bounding box around a cluster.
If pencolor is not defined, color is
used. If this is not defined, bgcolor is used.
If this is not defined, the default is used.
Note that a cluster inherits the root graph's attributes if defined.
Thus, if the root graph has defined a pencolor, this will override a
color or bgcolor attribute set for the cluster.
- penwidth
- Specifies the width of the pen, in points, used to draw lines and curves,
including the boundaries of edges and clusters. The value is inherited
by subclusters.
It has no effect on text.
Previous to 31 January 2008, the effect of penwidth=W
was achieved by including setlinewidth(W)
as part of a style specification.
If both are used, penwidth will be used.
- peripheries
- Set number of peripheries used in polygonal shapes and cluster
boundaries. Note that
user-defined shapes are treated as a
form of box shape, so the default
peripheries value is 1 and the user-defined shape will be drawn in
a bounding rectangle. Setting peripheries=0 will turn this off.
Also, 1 is the maximum peripheries value for clusters.
- pin
- If true and the node has a pos attribute on input, neato or fdp prevents the
node from moving from the input position. This property can also be specified
in the pos attribute itself (cf. the point type).
Note: Due to an artifact of the implementation, final coordinates
are translated to the origin. Thus, if you look at the output coordinates
given in the (x)dot or plain format, pinned nodes will not have the same
output coordinates as were given on input. If this is important, a
simple workaround is to maintain the coordinates of a pinned node. The vector
difference between the old and new coordinates will give the translation,
which can then be subtracted from all of the appropriate coordinates.
- pos
- Position of node, or spline control points.
For nodes, the position indicates the center of the node.
On output, the coordinates are in points.
In neato and fdp, pos can be used to set the initial position of a node.
By default, the coordinates are assumed to be in inches. However, the
-s command line flag can be used to specify
different units. As the output coordinates are in points,
feeding the output of a graph laid out by a Graphviz program into
neato or fdp will almost always require the -s flag.
When the -n command line flag is used with
neato, it is assumed the positions have been set by one of the layout
programs, and are therefore in points. Thus, neato -n can accept
input correctly without requiring a -s flag and, in fact,
ignores any such flag.
- quadtree
- Quadtree scheme to use.
A TRUE bool value corresponds to "normal";
a FALSE bool value corresponds to "none".
As a slight exception to the normal interpretation of bool,
a value of "2" corresponds to "fast".
- quantum
- If quantum > 0.0, node label dimensions
will be rounded to integral multiples of the quantum.
- rank
- Rank constraints on the nodes in a subgraph.
If rank="same", all nodes are placed on the same rank.
If rank="min", all nodes are placed on the minimum rank.
If rank="source", all nodes are placed on the minimum rank, and
the only nodes on the minimum rank belong to some subgraph whose
rank attribute is "source" or "min".
Analogous criteria hold for rank="max" and rank="sink".
(Note: the
minimum rank is topmost or leftmost, and the maximum rank is bottommost
or rightmost.)
- rankdir
- Sets direction of graph layout. For example, if rankdir="LR",
and barring cycles, an edge
T -> H; will go
from left to right. By default, graphs are laid out from top to bottom.
This attribute also has a side-effect in determining how record nodes
are interpreted. See record shapes.
- ranksep
- In dot, this gives the desired rank separation, in inches. This is
the minimum vertical distance between the bottom of the nodes in one
rank and the tops of nodes in the next. If the value
contains "equally", the centers of all ranks are spaced equally apart.
Note that both
settings are possible, e.g., ranksep = "1.2 equally".
In twopi, this attribute specifies the radial separation of concentric circles.
For twopi, ranksep can also be a list of doubles. The first double specifies
the radius of the inner circle; the second double specifies the increase in
radius from the first circle to the second; etc. If there are more circles than
numbers, the last number is used as the increment for the remainder.
- ratio
- Sets the aspect ratio (drawing height/drawing width) for the drawing.
Note that this is adjusted before
the size attribute constraints are enforced.
In addition, the calculations usually ignore the node sizes, so the
final drawing size may only approximate what is desired.
If ratio is numeric, it is taken as the desired aspect ratio.
Then, if the actual aspect ratio is less than the desired ratio,
the drawing height is scaled up to achieve the
desired ratio; if the actual ratio is greater than that desired ratio,
the drawing width is scaled up.
If ratio = "fill" and the size
attribute is set, node positions are scaled, separately in both x
and y, so that the final drawing exactly fills the specified size.
If both size values exceed the width
and height of the drawing, then both coordinate values of each
node are scaled up accordingly. However, if either size dimension
is smaller than the corresponding dimension in the drawing, one
dimension is scaled up so that the final drawing has the same aspect
ratio as specified by size.
Then, when rendered, the layout will be
scaled down uniformly in both dimensions to fit the given
size, which may cause nodes and text
to shrink as well. This may not be what the user
wants, but it avoids the hard problem of how to reposition the
nodes in an acceptable fashion to reduce the drawing size.
If ratio = "compress" and the size
attribute is set, dot attempts to compress the initial layout to fit
in the given size. This achieves a tighter packing of nodes but
reduces the balance and symmetry. This feature only works in dot.
If ratio = "expand", the size
attribute is set, and both the width and the height of the graph are
less than the value in size, node positions are scaled
uniformly until at least
one dimension fits size exactly.
Note that this is distinct from using size as the
desired size, as here the drawing is expanded before edges are generated and
all node and text sizes remain unchanged.
If ratio = "auto", the page
attribute is set and the graph cannot be drawn on a single page,
then size is set to an ``ideal'' value.
In particular, the size in a given dimension will be the smallest integral
multiple of the page size in that dimension which is at least half the
current size. The two dimensions are then scaled independently to the
new size. This feature only works in dot.
- rects
- Rectangles for fields of records, in points.
- regular
- If true, force polygon to be regular.
- remincross
- If true and there are multiple clusters, run cross
minimization a second time.
- repulsiveforce
- The power of the repulsive force used in an extended Fruchterman-Reingold
force directed model. Values larger than 1 tend to reduce
the warping effect at the expense of less clustering.
- resolution
- This is a synonym for the dpi attribute.
- root
- This specifies nodes to be used as the center of the
layout and the root of the generated spanning tree. As a graph attribute,
this gives the name of the node. As a node attribute (circo only), it
specifies that the node should be used as a central node. In twopi,
this will actually be the central node. In circo, the block containing
the node will be central in the drawing of its connected component.
If not defined,
twopi will pick a most central node, and circo will pick a random node.
- rotate
- If 90, set drawing orientation to landscape.
- samehead
- Edges with the same head and the same samehead value are aimed
at the same point on the head.
See limitation.
- sametail
- Edges with the same tail and the same sametail value are aimed
at the same point on the tail.
See limitation.
- samplepoints
- If the input graph defines the vertices
attribute, and output is dot or xdot, this gives
the number of points used for a node whose shape is a circle or ellipse.
It plays the same role in neato, when adjusting the layout to avoid
overlapping nodes, and in image maps.
- searchsize
- During network simplex, maximum number of edges with negative cut values
to search when looking for one with minimum cut value.
- sep
- Specifies margin to leave around nodes when removing node overlap.
This guarantees a minimal non-zero distance between nodes.
If the attribute begins with a plus sign '+', an additive margin is
specified. That is, "+w,h" causes the node's bounding box to be increased
by w
points on the left and right sides, and by h points on the top and bottom.
Without a plus sign, the node is scaled by 1 + w in the x coordinate
and 1 + h in the y coordinate.
If only a single number is given, this is used for both dimensions.
If unset but esep is defined, the sep values
will be set to the esep values divided by 0.8.
If esep is unset, the default value is used.
- shape
- Set the shape of a node.
- shapefile
- (Deprecated) If defined, shapefile specifies a file containing user-supplied node content.
The shape of the node is set to box.
The image in the shapefile must be
rectangular. The image formats supported as well as the precise semantics of
how the file is used depends on the
output format. For further details, see
Image Formats and
External PostScript files.
There is one exception to this usage.
If shape is set to "epsf", shapefile gives
a filename containing a definition of the node in PostScript.
The graphics defined must be contain all of the
node content, including any desired boundaries.
For further details, see
External PostScript files.
- showboxes
- Print guide boxes in PostScript at the beginning of
routesplines if 1, or at the end if 2. (Debugging)
- sides
- Number of sides if shape=polygon.
- size
- Maximum width and height of drawing, in inches.
If only a single number is given, this is used for both the width
and the height.
If defined and the drawing is larger than the given size,
the drawing is uniformly
scaled down so that it fits within the given size.
If size ends in an exclamation point (!),
then it is taken to be
the desired size. In this case, if both dimensions of the drawing are
less than size, the drawing is scaled up uniformly until at
least one dimension equals its dimension in size.
Note that there is some interaction between the size and
ratio attributes.
- skew
- Skew factor for shape=polygon. Positive values
skew top of polygon to right; negative to left.
- smoothing
- Specifies a post-processing step used to smooth out an uneven distribution
of nodes.
- sortv
- If packmode indicates an array packing,
this attribute specifies an
insertion order among the components, with smaller values inserted first.
- splines
- Controls how, and if, edges are represented. If true, edges are drawn as
splines routed around nodes; if false, edges are drawn as line segments.
If set to "", no edges are drawn at all.
(1 March 2007) The values line and spline can be
used as synonyms for false and true, respectively.
In addition, the value polyline specifies that edges should be
drawn as polylines.
By default, the attribute is unset. How this is interpreted depends on
the layout. For dot, the default is to draw edges as splines. For all
other layouts, the default is to draw edges as line segments. Note that
for these latter layouts, if splines="true", this
requires non-overlapping nodes (cf. overlap).
If fdp is used for layout and splines="compound", then the edges are
drawn to avoid clusters as well as nodes.
- start
- Parameter used to determine the initial layout of nodes. If unset, the
nodes are randomly placed in a unit square with
the same seed is always used for the random number generator, so the
initial placement is repeatable.
- style
- Set style for node or edge. For cluster subgraph, if "filled", the
cluster box's background is filled.
- stylesheet
- A URL or pathname specifying an XML style sheet, used in SVG output.
- tailURL
- If tailURL is defined, it is
output as part of the tail label of the edge.
Also, this value is used near the tail node, overriding any
URL value.
See limitation.
- tailclip
- If true, the tail of an edge is clipped to the boundary of the tail node;
otherwise, the end of the edge goes to the center of the node, or the
center of a port, if applicable.
- tailhref
- Synonym for tailURL.
- taillabel
- Text label to be placed near tail of edge.
See limitation.
- tailport
- Indicates where on the tail node to attach the tail of the edge.
See limitation.
- tailtarget
- If the edge has a tailURL,
this attribute determines 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 reuse it if it does.
If undefined, the value of the target is used.
- tailtooltip
- Tooltip annotation attached to the tail of an edge. This is used only
if the edge has a tailURL attribute.
- target
- If the object has a URL, this attribute determines which window
of the browser is used for the URL.
See W3C documentation.
- tooltip
- Tooltip annotation attached to the node or edge. If unset, Graphviz
will use the object's label if defined.
Note that if the label is a record specification or an HTML-like
label, the resulting tooltip may be unhelpful. In this case, if
tooltips will be generated, the user should set a tooltip
attribute explicitly.
- truecolor
- If set explicitly to true or false, the value determines whether or not
internal bitmap rendering relies on a truecolor color model or uses
a color palette.
If the attribute is unset, truecolor is not used
unless there is a shapefile property
for some node in the graph.
The output model will use the input model when possible.
Use of color palettes results in less memory usage during creation of the
bitmaps and smaller output files.
Usually, the only time it is necessary to specify the truetype model
is if the graph uses more than 256 colors.
However, if one uses bgcolor=transparent with
a color palette, font
antialiasing can show up as a fuzzy white area around characters.
Using truecolor=true avoids this problem.
- vertices
- If the input graph defines this attribute, the node is polygonal,
and output is dot or xdot, this attribute provides the
coordinates of the vertices of the node's polygon, in inches.
If the node is an ellipse or circle, the
samplepoints attribute affects
the output.
- viewport
- Clipping window on final drawing.
- voro_margin
- Factor to scale up drawing to allow margin for expansion in
Voronoi technique. dim' = (1+2*margin)*dim.
- weight
- Weight of edge. In dot, the heavier the weight, the shorter,
straighter and more vertical the edge is.
- width
- Width of node, in inches. This is taken as the initial, minimum width
of the node. If fixedsize is true, this
will be the final width of the node. Otherwise, if the node label
requires more width to fit, the node's width will be increased to
contain the label. Note also that, if the output format is dot, the
value given to width will be the final value.
- z
- Deprecated:Use pos attribute, along
with dimen and/or dim
to specify dimensions.
Provides z coordinate value for 3D layouts and displays. If the
graph has dim set to 3 (or more),
neato will use a node's z value
for the z coordinate of its initial position if
its pos attribute is also defined.
Even if no z values are specified in the input, it is necessary to
declare a z attribute for nodes, e.g, using node[z=""]
in order to get z values on output.
Thus, setting dim=3 but not declaring z will
cause neato -Tvrml to
layout the graph in 3D but project the layout onto the xy-plane
for the rendering. If the z attribute is declared, the final rendering
will be in 3D.
- arrowType
| "normal" | 
| "inv" |  |
| "dot" | 
| "invdot" |  |
| "odot" | 
| "invodot" |  |
| "none" | 
| "tee" |  |
| "empty" | 
| "invempty" |  |
| "diamond" | 
| "odiamond" |  |
| "ediamond" | 
| "crow" |  |
| "box" | 
| "obox" |  |
| "open" | 
| "halfopen" |  |
| "vee" |
|
These are the basic set of backward-compatible arrow shapes. In addition,
there is a grammar of arrow shapes
which can be used to describe a collection of 1,544,761 arrow combinations of the 36 varations of the primitive set of 9 arrows. The basic arrows shown
above contain all of the primitive shapes
(box, crow, diamond,
dot, inv, none,
normal, tee, vee)
plus ones that can be derived from the grammar
(odot, invdot, invodot,
obox, odiamond)
plus some supported as special cases for backward-compatibility
(ediamond, open, halfopen,
empty, invempty).
- aspectType
An aspect ratio, double, followed optionally by a ',' and a maximum pass
count. If the aspect ratio is given, but no maximum pass count, the
latter defaults to 5.
- clusterMode
- "local","global","none"
- color
- Colors can be specified using one of four formats.
| "#%2x%2x%2x" | Red-Green-Blue (RGB) |
| "#%2x%2x%2x%2x" | Red-Green-Blue-Alpha (RGBA) |
| H[, ]+S[, ]+V | Hue-Saturation-Value (HSV) 0.0 <= H,S,V <= 1.0 |
| string | color name |
The specification for the RGB and RGBA formats are the format strings used by
sscanf to scan the color value. Thus, these values have the form
"#RGB" or "#RGBA", where R, G, B, and A each consist of 2 hexidecimal
digits, and can be separated by whitespace. HSV colors have the form of 3
numbers between 0 and 1, separated by whitespace or commas.
String-valued color specifications are case-insensitive and interpreted
in the context of the current color scheme, as specified by the
colorscheme attribute. If this is undefined,
the X11 naming scheme will be used.
An initial "/" character can be used to override the use of
the colorscheme attribute. In particular, a single initial
"/" will cause the string to be evaluated using the default
X11 naming. If the color value has the form "/ssss/yyyy",
the name yyyy is interpreted using the schema ssss.
If the color scheme name is empty, i.e., the color has the
form "//yyyy", the colorscheme attribute is used.
Thus, the forms "yyyy" and "//yyyy" are
equivalent.
At present, Graphviz recognizes the default color scheme X11,
and the Brewer color schemes (cf. ColorBrewer). Please note that Brewer
color schemes are covered by this license.
Examples:
| Color | RGB | HSV | String |
|---|
| White | "#ffffff" | "0.000 0.000 1.000" | "white" |
| Black | "#000000" | "0.000 0.000 0.000" | "black" |
| Red | "#ff0000" | "0.000 1.000 1.000" | "red" |
| Turquoise | "#40e0d0" | "0.482 0.714 0.878" | "turquoise" |
| Sienna | "#a0522d" | "0.051 0.718 0.627" | "sienna" |
The string value transparent can be used to indicate no color.
This is only available in the output formats
ps, svg, fig, vmrl, and the bitmap formats. It can be used whenever a
color is needed but is most useful with
the bgcolor attribute.
Usually, the same effect can be achieved by setting
style to invis.
- colorList
- A colon-separated list of color values: C(:C)*
where each C is a color value.
- dirType
- For an edge
T -> H;
| "forward" | 
| "back" |  |
| "both" | 
| "none" |  |
That is, a glyph is drawn at the head end of an edge if and only
if dirType is "forward" or "both";
a glyph is drawn at the tail end of an edge if and only
if dirType is "back" or "both";
For undirected edges T -- H;, one of the nodes, usually
the righthand one, is treated as the head for the purpose of
interpreting "forward" and "back".
- doubleList
- A colon-separated list of doubles: d(:d)*
where each d is a double.
- escString
- string allowing escape sequences which are replaced according
to the context.
For node attributes, the substring "\N" is replaced by the name of the node,
and the substring "\G" by the name of the graph.
For graph or cluster attributes, the substring "\G" is replaced by the
name of the graph or cluster.
For edge attributes, the substring "\E" is replaced by the name of the edge,
the substring "\G" is replaced by the name of the graph or cluster,
and the substrings "\T" and "\H" by the names of
the tail and head nodes, respectively.
The name of an edge is the string formed from the name of the
tail node, the appropriate edge operator ("--" or "->") and the name of the
head node.
In all cases, the substring "\L" is replaced by the object's label attribute.
In addition, if the associated attribute is
label,
headlabel or taillabel,
the escape sequences "\n", "\l" and "\r"
divide the label into lines, centered, left-justified, and right-justified,
respectively.
- layerList
- list of strings separated by characters from the
layersep attribute (by default, colons,
tabs or spaces), defining layer
names and implicitly numbered 1,2,...
- layerRange
- layerId or layerIdslayerId,
where layerId = "all",
a decimal integer or a layer name.
(An integer i corresponds to layer i.)
The string s consists of 1 or more separator characters specified
by the layersep attribute.
- lblString
- an escString
or an HTML label.
- outputMode
- "breadthfirst","nodesfirst","edgesfirst"
These specify the order in which nodes and edges are drawn in concrete
output. The default "breadthfirst" is the simplest, but when the graph
layout does not avoid edge-node overlap, this mode will sometimes have
edges drawn over nodes and sometimes on top of nodes. If the mode
"nodesfirst" is chosen, all nodes are drawn first, followed by the
edges. This guarantees an edge-node overlap will not be mistaken for
an edge ending at a node. On the other hand, usually for aesthetic
reasons, it may be desirable that all edges appear beneath nodes, even
if the resulting drawing is ambiguous. This can be achieved by choosing
"edgesfirst".
- packMode
- "node", "clust" , "graph" , "array[_flags][%d]"
The modes "node", "clust" or "graph"
specify that the components should be packed together tightly, using
the specified granularity.
A value of "node" causes
packing at the node and edge level, with no overlapping of these objects.
This produces a layout with the least area, but it also allows interleaving,
where a node of one component may lie between two nodes in another
component. A value of "graph" does a packing using the bounding box of the
component. Thus, there will be a rectangular region around a component
free of elements of any other component.
A value of "clust" guarantees that top-level clusters are kept intact.
What effect a value has also depends on the layout algorithm. For
example, neato does not support clusters, so a value of "clust" will
have the same effect as the default "node" value.
The mode "array[_flags][%d]"
indicates that the components should be packed at the
graph level into an array of graphs. By default, the components
are in row-major order, with the number of columns roughly the
square root of the number of components. If the optional flags
contains "c", then column-major order is used. Finally, if the
optional integer suffix is used, this specifies the number of
columns for row-major or the number of rows for column-major.
Thus, the mode "array_c4" indicates array packing, with 4 rows,
starting in the upper left and going down the first column, then
down the second column, etc., until all components are used.
If the optional flags contains "u", this causes the insertion
order of elements in the array to be determined by user-supplied
values. Each component can specify its sort value by a
non-negative integer using the sortv attribute.
Components are
inserted in order, starting with the one with the smallest
sort value. If no sort value is specified, zero is used.
- pagedir
- "BL", "BR", "TL", "TR", "RB", "RT", "LB", "LT".
These specify the 8 row or column major orders for traversing a
rectangular array, the first character corresponding to the major
order and the second to the minor order. Thus, for "BL", the
major order is from bottom to top, and the minor order is from left
to right. This means the bottom row is traversed first, from left
to right, then the next row up, from left to right, and so on,
until the topmost row is traversed.
- point
- "%f,%f"('!') representing the point (x,y). The
optional '!' indicates the
node position should not change (input-only).
If dim is 3 or more, point may also have
the format "%f,%f,%f"('!') to represent the point (x,y,z).
- pointf
- "%lf,%lf" representing the point (x,y).
- pointfList
- list of pointf, separated by spaces.
- portPos
- modifier indicating where on a node an edge should be aimed.
It has the form portname[:compass_point]
or compass_point.
If the first form is used, the corresponding node must either have
record shape with one of its fields
having the given portname,
or have an HTML-like label, one of
whose components has a PORT attribute set to portname.
If a compass point is used, it must have the form
"n","ne","e","se","s","sw","w","nw","c","_". This modifies the edge
placement to aim for the corresponding compass point on the port or,
in the second form where no portname is supplied, on the node
itself. The compass point "c" specifies the center of the node or port.
The compass point "_" specifies that an appropriate side of the port
adjacent to the exterior of the node should be used, if such exists.
Otherwise, the center is used.
If no compass point is used with a portname, the default value is "_".
This attribute can be attached to an edge using the
headport and
tailport attributes, or as part of the
edge description as in
node1:port1 -> node2:port5:nw;
Note that it is legal to have a portname the same as one of
the compass points. In this case, this reference will be resolved to
the port. Thus, if node A has a port w, then
headport=w will refer to the port and not the compass point.
At present, in this case, there is no way to specify that the compass
point should be used.
- quadType
- "normal", "fast", "none".
Using "fast" gives about a 2-4 times overall speedup compared with "normal",
though layout quality can suffer a little.
- rankType
- "same", "min", "source", "max", "sink"
- rankdir
- "TB", "LR", "BT", "RL", corresponding to directed graphs drawn
from top to bottom, from left to right, from bottom to top, and from
right to left, respectively.
- rect
- "%f,%f,%f,%f" The rectangle llx,lly,urx,ury gives the coordinates, in
points, of the lower-left corner (llx,lly) and the upper-right corner
(urx,ury).
- shape
- A string specifying the shape of a node.
There are three
main types of shapes :
polygon-based,
record-based and
user-defined.
- smoothType
- Values are "none", "avg_dist", "graph_dist", "power_dist", "rng",
"spring" and "triangle".
- splineType
- spline ( ';' spline )*
| where spline | = | (endp)? (startp)? point (triple)+ |
| and triple | = | point point point |
| and endp | = | "e,%f,%f" |
| and startp | = | "s,%f,%f" |
If a spline has points p1 p2 p3 ... pn, (n = 1 (mod 3)), the points
correspond to the control points of a B-spline from p1 to pn. If startp
is given, it touches one node of the edge, and the arrowhead
goes from p1 to startp. If startp is not given, p1 touches a node.
Similarly for pn and endp.
- startType
- has the syntax [style][seed].
If style is present, it must be one of the strings "regular",
"self", or "random". In the first case, the nodes are
placed regularly about a circle. In the second case,
an abbreviated version of neato is run to obtain the initial layout.
In the last case, the nodes are placed randomly in a unit square.
If seed is present, it specifies a seed for the random number
generator. If seed is a positive number, this is used as the
seed. If it is anything else,
the current time, and possibly the process id, is used to pick a seed,
thereby making the choice more random. In this case, the seed value
is stored in the graph.
If the value is just "random", a time-based seed is chosen.
Note that input positions, specified by a node's
pos
attribute, are only used when the style is "random".
- style
- styleItem ( ',' styleItem )*
| where styleItem | = | name or name'('args')' |
| and args | = | name ( ',' name )* |
| and name | = | [^)(, ][^)(,]* |
Note that whitespace characters are ignored, except for names which
can contain them. A
name cannot contain any comma, or left or right parenthesis, and it cannot
begin with a whitespace character.
At present, the recognized style names are
"dashed", "dotted", "solid", "invis" and "bold" for nodes and edges,
and "filled", "diagonals" and "rounded" for nodes only.
The styles "filled" and "rounded" are recognized for clusters.
Additional styles are available in
device-dependent form. Style lists are passed to device drivers, which
can use this to generate appropriate output.
The setlinewidth style value can be
used for more control over the width of node borders and edges than is
allowed by bold. This style value takes an argument, specifying the
width of the line in points. For example, style="bold" is
equivalent to style="setlinewidth(2)".
The use of setlinewidth is deprecated; one should use the
penwidth attribute instead.
- viewPort
- "%lf,%lf,%lf,%lf,%lf" or "%lf,%lf,%lf,'%s'"
The viewPort W,H,Z,x,y or W,H,Z,N
specifies a viewport for the final image. The pair (W,H) gives the
dimensions (width and height) of the final image, in
points.
The optional Z is the zoom factor, i.e., the image in the original layout will be
W/Z by H/Z points in size. By default, Z is 1.
The optional last part is either a pair (x,y) giving a position in the original layout of the
graph, in
points, of the center of the viewport, or the name N
of a node whose center should used as the focus.
By default, the focus is the center of the graph bounding box, i.e.,
(bbx/2,bby/2), where "bbx,bby" is the
value of the bounding box attribute bb.
Sample values: 50,50,.5,'2.8 BSD' or 100,100,2,450,300.
The first will take the 100x100 point square centered on the node 2.8 BSD
and scale it down by 0.5, yielding a 50x50 point final image.