Graph Attributes
The table below describes the attributes used by various GraphViz tools.
The table gives the name of the attribute, the graph components (node,
edge, etc.) which use the attribute and the type of the attribute
(strings representing legal values of that type). Where applicable, the table
also gives a default value for the attribute, a minimum allowed setting
for numeric attributes, and certain restrictions on the use of the attribute.
All GraphViz attributes are specified by name-value pairs. Thus, to
set the fillcolor of a node abc, one would use
Similarly, to set the arrowhead style of an edge abc -> def,
one would use
| abc -> def [arrowhead = diamond] |
Further details concerning the setting of attributes can be found
in the description of the
DOT language.
Note: Some attributes, such as
dir or arrowtail, are
ambiguous when used in
DOT
with an undirected graph since the head and tail of an edge are meaningless.
As a convention, the first time an undirected edge appears, the
DOT
parser will assign the left node as the tail node and the right node as
the head. For example, the edge A -- B will have tail A
and head B. It is the user's responsibility to handle such
edges consistently. If the edge appears later, in the format
| B -- A [taillabel = "tail"] |
the drawing will attach the tail label to node A.
To avoid possible confusion when such attributes are required, the user
is encouraged to use a directed graph.
If it is important to make the graph appear undirected, this can be
done using the dir, arrowtail
or arrowhead attributes.
The tools accept standard C representations for int and
double types.
For the bool type, TRUE values are
represented by "true" (case-insensitive)
and any non-zero integer, and FALSE values by "false" (case-insensitive)
and zero.
In addition, there are a variety of specialized types such as
arrowType, color,
pointf and rankdir. Legal values for these types are given
at the end.
In the Used By field, the
characters E, N, G, S and C
represent edges, nodes, the root graph, subgraphs
and cluster subgraphs, respectively.
This field indicates which graph component uses the attribute.
Attribute Descriptions
- 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.
- 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.
The active area for a node or cluster is its bounding box. For edges,
the active areas are small circles where the edge contacts its head
and tail nodes. These areas 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, however, that if the edge has a headURL
attribute, it is this value that is used near the head node and on
the head label, if defined. The similar restriction holds when
tailURL is defined.
The URL of the root graph is only treated as an
escString if the output format is cmap.
- arrowhead
- Style of arrowhead on the head node of an edge.
See also the dir attribute,
and a limitation.
- arrowsize
- Multiplicative scale factor for arrowheads.
- arrowtail
- Style of arrowhead on the tail node of an edge.
See also the dir attribute,
and a limitation.
- bb
- Bounding box of drawing in integer 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.
- bottomlabel
- Additional label near bottom of nodes of shape M*.
- center
- If true, the drawing is centered in the output canvas.
- 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.
- 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.
- 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.
- 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.
- distortion
- Distortion factor for shape=polygon.
Positive values cause top part to
be larger than bottom; negative values do the opposite.
- epsilon
- Terminating condition. If the length squared of all energy gradients are
< epsilon, the algorithm stops.
- fillcolor
- Color used to fill the background of a node or cluster.
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.
The GraphViz tools use True Type fonts for bitmap output. If you specify
fontname=schlbk, the tool will look for a file named schlbk.ttf
in one of the directories specified by the fontpath attribute.
- fontpath
- Directory list used by libgd to search for bitmap fonts.
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
- For the output format imap or cmap, if headURL is defined, it is
output as part of the head label of the edge.
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.
- 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.
- labelangle
- Angle, in degrees, that the headlabel(taillabel) is rotated
from the angle the edge makes incident with the head(tail) node,
respectively.
- labeldistance
- Multiplicative scaling factor adjusting the distance that
the headlabel(taillabel) is the from head(tail) node.
- 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.
- labelfontname
- Font used for headlabel and taillabel.
- labelfontsize
- Font size, in points, used for headlabel and taillabel.
- 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
- Top/bottom placement of graph and cluster labels.
If the attribute is "t", place label at the top;
if the attribute is "b", place label at the bottom.
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.
- 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.
- len
- Preferred edge length, in inches.
- 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.
- 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
- Set x and y margins of canvas, in inches. In first case,
both margins are set equal to the given value.
- 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).
- model
- If "circuit", use circuit resistance model to compute
dissimilarity values; otherwise, use shortest path model.
- nodesep
- Minimum space between two adjacent nodes in the same rank, in inches.
- 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.
- orientation
- Angle, in degrees, used to rotate node shapes.
- 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
- If "scale", remove node overlaps by scaling;
if converts to false, remove node overlaps by the Voronoi technique;
otherwise, leave overlaps. This is not yet available in circo.
- 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 tightly.
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 the granularity and method used for packing
(cf. packMode). Note that defining
packmode will automatically turn on packing as though one had
set pack=true.
- page
- Width and height of output pages, in inches. 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.
- 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.
- 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 prevents the
node from moving from the input position. This property can also be specified
in the pos attribute itself (cf. the point type).
- pos
- Position of node, or spline control points, in points.
In neato, pos can be used to set initial position of a node.
Concerning this, see the -s command line flag.
- 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. If rankdir="LR", the graph is laid
out from left to right, i.e., directed edges tend to go from left to
right. By default, graphs are laid out from top to bottom.
- ranksep
- In dot, this the gives 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, specifies radial separation of concentric circles.
- ratio
- Sets the aspect ratio (drawing height/drawing width) for the drawing.
Note that this is adjusted before
the size attribute constraints are enforced.
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 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 = "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.
- resolution
- This specifies the expected number of pixels per inch on a display.
It is used to guarantee that dimensions in the output correspond to
the correct number of points or inches.
- 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 give
the number of points used to represent circles and ellipses.
It plays the same role in neato, when adjusting the layout to avoid
overlapping nodes.
- searchsize
- During network simplex, maximum number of edges with negative cut values
to search when looking for one with minimum cut value.
- sep
- Fraction to increase polygons (multiply
coordinates by 1 + sep) for purposes of determining overlap. Guarantees
a minimal non-zero distance between nodes.
- shape
- Set the shape of a node.
- shapefile
- If non-empty, when output format is ps* or svg*
and shape is set to "espf", taken as
a filename containing a device-dependent description of a node's shape.
If non-empty for bitmap output (gif, jpeg, png, etc.) and
shape set to "custom", taken as
the URL for a file containing the bitmap image for the node.
For files on the local machine, the URL begins with "file://". For
remote files, graphviz must have been configured to use a command such
as curl to retrieve the files remotely.
- 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, inches.
If defined and the drawing is too large, the drawing is uniformly
scaled down so that it fits within the given 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.
- splines
- If true, draw edges as splines. This requires non-overlapping
nodes (cf. overlap).
- start
- Parameter used to determine the initial layout of nodes. By default,
nodes are randomly placed in a square whose sides have length (# nodes).
The same seed is always used for the random number generator, so the
initial placement is repeatable.
If start converts to an integer, this is used as a seed value for the
random number generator.
If start is "regular", the nodes are placed regularly about a circle.
Finally, if start is defined but is not one of the above cases,
the current time is used to pick a seed.
- 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
- When the output format is imap or cmap, if tailURL is defined, it is
output as part of the tail label of the edge.
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. Setting it to "_graphviz" will open a new window if it
doesn't already exist, or reuse it if it does.
- tooltip
- Tooltip annotation attached to the node or edge. This is used only
if the object has a URL attribute.
- toplabel
- Additional label near top of nodes of shape M*.
- truecolor
- If set explicitly to true or false, the value determines whether or not
bitmap output relies on a truecolor color model. If the attribute is
unset, then automatic selection is used. Automatic selection uses indexed
color, unless there is a shapefile property
for any node in the graph.
- vertices
- If the input graph defines this attribute, the node is polynomial,
and output is dot or xdot, this attribute provides the
coordinates of the vertices of the node's polynomial, in inches.
If the node is an ellipse or circle, the
samplepoints attribute affects
the output.
- 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. In neato, the heavier the
weight, the more neato will try to place the end points so that the
length of the edge is len.
- 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
- Provides z coordinate for the node when output format is VRML.
Attribute Type Descriptions
The following list gives the legal strings corresponding to values of
the given types.
- arrowType
| "normal" |  |
"inv" | 
| | "dot" | 
| "invdot" |  |
| "odot" | 
| "invodot" |  |
| "none" | 
| "tee" |  |
| "empty" | 
| "invempty" |  |
| "diamond" | 
| "odiamond" |  |
| "ediamond" | 
| "crow" |  |
| "box" | 
| "obox" |  |
| "open" | 
| "halfopen" |  |
These are the basic arrow shapes. In addition, there is a grammar
of arrow shapes
which can be used to describe a collection of 1200 arrow shapes as
modifications of a primitive set of 9 arrows. The basic arrows shown
above contain all of the primitive shapes (e.g., normal,
box, tee, etc.)
plus ones that can be derived from the grammar (e.g., ediamond,
inv).
- clusterMode
- "local","global","none"
- color
| "#%2x%2x%2x" | RGB |
| "#%2x%2x%2x%2x" | RGBA |
| H[, ]+S[, ]+V | 0.0 <= H,S,V <= 1.0 |
| string | color name |
- dirType
- For an edge
T -> H;
| "forward" | 
| "back" |  |
| "both" | 
| "none" |  |
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".
- 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 "\N" is replaced by the name of the edge,
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 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"
These specify the granularity of packing connected components when
the pack attribute is true. A value of "node" causes
packing at the node and edge label, 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.
- 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
- "%d,%d"('!') representing the point (x,y). The
optional '!' indicates the
node position should not change (input-only).
- pointf
- "%lf,%lf" representing the point (x,y).
- pointfList
- list of pointf, separated by spaces.
- portPos
- ":n",":ne",":e",":se",":s",":sw",":w",":nw"
These correspond to the obvious compass points on the node.
- rankType
- "same", "min", "source", "max", "sink"
- rankdir
- "LR". Any other value corresponds to a top-down layout.
- rect
- "%d,%d,%d,%d" The rect 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.
- splineType
- spline ( ';' spline )*
| where spline | = | (endp)? (startp)? point (triple)+ |
| and triple | = | point point point |
| and endp | = | "e,%d,%d" |
| and startp | = | "s,%d,%d" |
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.
- style
- styleItem ( ',' styleItem )*
| where styleItem | = | name or name'('args')' |
| and args | = | name ( ',' name )* |
| and name | = | [^)(, ][^)(,]* |
At present, the recognized style names comprise
"dashed", "dotted", "solid", "invis" and "bold" for nodes and edges,
and "filled", "diagonals" and "rounded" for nodes only.
Additional styles are available in
device-dependent form. Style lists are passed to device drivers, which
can use this to generate appropriate output.
Note that, at present, "rounded" cancels "filled", except for circles
and ellipses. This holds for the Mrecord shape, which is rounded by
definition.