Edge Attributes

Examples of edge statements:

edge [name0=val0] sets default edge attribute name0 to val0. Any edge appearing after this inherits the new default attributes.

n1 -> n2 [name1=val1] or n1 -- n2 [name1=val1] creates directed or undirected edge between nodes n1 and n2 and sets its attributes according to the optional list and default attributes for edges.

• arrowhead – Style of arrowhead on the head node of an edge.
• arrowsize – Multiplicative scale factor for arrowheads.
• arrowtail – Style of arrowhead on the tail node of an edge.
• class – Classnames to attach to the node, edge, graph, or cluster's SVG element. For svg only.
• color – Basic drawing color for graphics, not text.
• colorscheme – A color scheme namespace: the context for interpreting color names.
• comment – Comments are inserted into output.
• constraint – If false, the edge is not used in ranking the nodes. For dot only.
• decorate – Whether to connect the edge label to the edge with a line.
• dir – Edge type for drawing arrowheads.
• edgehref – Synonym for edgeURL. For map, svg only.
• edgetarget – Browser window to use for the edgeURL link. For map, svg only.
• edgetooltip – Tooltip annotation attached to the non-label part of an edge. For cmap, svg only.
• edgeURL – The link for the non-label parts of an edge. For map, svg only.
• fillcolor – Color used to fill the background of a node or cluster.
• fontcolor – Color used for text.
• fontname – Font used for text.
• fontsize – Font size, in points, used for text.
• head_lp – Center position of an edge's head label. For write only.
• headclip – If true, the head of an edge is clipped to the boundary of the head node.
• headhref – Synonym for headURL. For map, svg only.
• headlabel – Text label to be placed near head of edge.
• headport – Indicates where on the head node to attach the head of the edge.
• headtarget – Browser window to use for the headURL link. For map, svg only.
• headtooltip – Tooltip annotation attached to the head of an edge. For cmap, svg only.
• headURL – If defined, headURL is output as part of the head label of the edge. For map, svg only.
• href – Synonym for URL. For map, postscript, svg only.
• id – Identifier for graph objects. For map, postscript, svg only.
• label – Text label attached to objects.
• labelangle – The angle (in degrees) in polar coordinates of the head & tail edge labels.
• labeldistance – Scaling factor for the distance of headlabel / taillabel from the head / tail nodes.
• labelfloat – If true, allows edge labels to be less constrained in position.
• labelfontcolor – Color used for headlabel and taillabel.
• labelfontname – Font for headlabel and taillabel.
• labelfontsize – Font size of headlabel and taillabel.
• labelhref – Synonym for labelURL. For map, svg only.
• labeltarget – Browser window to open labelURL links in. For map, svg only.
• labeltooltip – Tooltip annotation attached to label of an edge. For cmap, svg only.
• labelURL – If defined, labelURL is the link used for the label of an edge. For map, svg only.
• layer – Specifies layers in which the node, edge or cluster is present.
• len – Preferred edge length, in inches. For neato, fdp only.
• lhead – Logical head of an edge. For dot only.
• lp – Label center position. For write only.
• ltail – Logical tail of an edge. For dot only.
• minlen – Minimum edge length (rank difference between head and tail). For dot only.
• nojustify – Whether to justify multiline text vs the previous text line (rather than the side of the container).
• penwidth – Specifies the width of the pen, in points, used to draw lines and curves.
• pos – Position of node, or spline control points. For neato, fdp only.
• samehead – Edges with the same head and the same samehead value are aimed at the same point on the head. For dot only.
• sametail – Edges with the same tail and the same sametail value are aimed at the same point on the tail. For dot only.
• showboxes – Print guide boxes for debugging. For dot only.
• style – Set style information for components of the graph.
• tail_lp – Position of an edge's tail label, in points. For write only.
• tailclip – If true, the tail of an edge is clipped to the boundary of the tail node.
• tailhref – Synonym for tailURL. For map, svg only.
• taillabel – Text label to be placed near tail of edge.
• tailport – Indicates where on the tail node to attach the tail of the edge.
• tailtarget – Browser window to use for the tailURL link. For map, svg only.
• tailtooltip – Tooltip annotation attached to the tail of an edge. For cmap, svg only.
• tailURL – If defined, tailURL is output as part of the tail label of the edge. For map, svg only.
• target – If the object has a URL, this attribute determines which window of the browser is used for the URL. For map, svg only.
• tooltip – Tooltip (mouse hover text) attached to the node, edge, cluster, or graph. For cmap, svg only.
• URL – Hyperlinks incorporated into device-dependent output. For map, postscript, svg only.
• weight – Weight of edge.
• xlabel – External label for a node or edge.
• xlp – Position of an exterior label, in points. For write only.