5 Graph Description Language (GDL) - Absint

5.9 Edge Attributes
This section describes the whole list of edge attributes. Each attribute is listed together with its
type and default value.
• anchor
Type: integer
Default value: no default value
Attribute of: edge
Description:
An anchor point describes the vertical position in a node where an edge starts. This is
useful if node labels are several lines long and outgoing edges are related to label lines. (For
instance, this allows a nice visualization of structs containing pointers as fields). A node
with anchored edges can only have one near edge at maximum. Further, if anchored edges
occur, the graph orientation is always top_to_bottom.
• arrowcolor, backarrowcolor
Type: black, blue, red, ...
Default value: value of the color attribute for both
Attribute of: edge
Description:
Respectively the color of the arrow head or backarrow head. For details on colors, see p.
105. See also edge attributes textcolor (p. 103) and color (p. 101).
• arrowsize, backarrowsize
Type: integer
Default value:
10 pixels for the arrowsize and
0 pixels for the backarrowsize
Attribute of: edge
Description:
The arrow head is a right-angled, isosceles triangle. These two attributes respectively specify
the length of the cathetuses of the arrow head and back arrow head.
• arrowstyle, backarrowstyle
Type: ”none”, ”solid”, ”line”, ”circle”, ...
Default value:
”solid” for the arrowstyle and
”none” for the backarrowstyle
Attribute of: edge
Description:
Each edge has two arrow heads, one arrow head pointing to the target node, called normal
arrow head, and the other one “pointing” to the source node, called back arrow head. arrowstyle
is the style of the normal arrow head and backarrowstyle the style of the back arrow
head. The styles are:
– ”none”
No arrow head is drawn.
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