styleItem ( ',' styleItem )*

where styleItem = name or name'('args')'
and args = name ( ',' name )*

and name can be any string of characters not containing a space, a left or right parenthesis, or a comma. Whitespace characters are ignored.

NOTE: The styles tapered, striped and wedged are only available in release 2.30 and later.

The recognized style names are,

For nodes and edges:

  • "dashed"
  • "dotted"
  • "solid"
  • "invis"
  • "bold"

For edges only:

  • "tapered"

For nodes only:

  • "filled"
  • "striped"
  • "wedged"
  • "diagonals"
  • "rounded"

For clusters:

  • "filled"
  • "striped"
  • "rounded"

The style "radial" is recognized for nodes, clusters and graphs, and indicates a radial-style gradient fill if applicable.

The style "striped" causes the fill to be done as a set of vertical stripes. The colors are specified via a colorList, the colors drawn from left to right in list order. Optional color weights can be specified to indicate the proportional widths of the bars. If the sum of the weights is less than 1, the remainder is divided evenly among the colors with no weight. Note: The style "striped" is only supported with clusters and rectangularly-shaped nodes.

The style "wedged" causes the fill to be done as a set of wedges. The colors are specified via a colorList, with the colors drawn counter-clockwise starting at angle 0. Optional color weights are interpreted analogously to the striped case described above. Note: The style "wedged" is allowed only for elliptically-shaped nodes.

The following tables illustrate some of the effects of the style settings. Examples of tapered line styles are given below. Examples of linear and radial gradient fill can be seen under colorList.

Basic style settings for nodes
solid dashed dotted
bold rounded diagonals
filled striped wedged
Basic style settings for edges
solid dashed
dotted bold
Basic style settings for clusters
solid dashed dotted bold
rounded filled striped

The effect of style=tapered depends on the penwidth, dir, arrowhead and arrowtail attributes. The edge starts with width penwidth and tapers to width 1, in points. The dir attribute determines whether the tapering goes from tail to head (dir=forward), from head to tail (dir=forward), from the middle to both the head and tail (dir=both), or no tapering at all (dir=none). If the dir is not explicitly set, the default for the graph type is used (see dir). Arrowheads and arrowtails are also drawn, based on the value of dir; to avoid this, set arrowhead and/or arrowtail to "none".

Note: At present, the tapered style only allows a simple filled polygon. Additional styles such as dotted or dashed, or multiple colors supplied via a colorList are ignored.

The following table illustrates the style=tapered with penwidth=7 and arrowtail=none.

dir \ arrowhead normal none

Additional styles are available in device-dependent form. Style lists are passed to device drivers, which can use this to generate appropriate output.

The style attribute affects the basic appearance of nodes, edges and graphs, but has no effect on any text used in labels. For this, use the fontname, fontsize and fontcolor attributes, or the <FONT>, <B>, <I>, etc. elements in HTML-like labels.

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.


style is a valid type for:
Last modified June 14, 2021 : Fix broken links to attributes (f71f7d8)