5 Graph Description Language (GDL) - Absint

• magnetic_field1, magnetic_field2
Type:
no, top_to_bottom, bottom_to_top, left_to_right, right_to_left,
polar, circular, orthogonal, polcircular
Default value: no
Attribute of: top-level graph
Description:
This attribute only applies to the forcedir layout algorithm.
Magnetic fields are part of impulse calculation. Forces that originate from a simulation of a
spring embedder neglect the directions of edges. In directed graphs edges should point in a
uniform direction, consequently magnetic forces are introduced, with edges being interpreted
as magnetic needles that align according to a magnetic field.
Two independent magnetic fields are possible. These two attributes specify the kind of magnetic
field for each. If two fields are specified, the edges are influenced by both. The attributes
magnetic_force1 and magnetic_force2 (p. 79) influence the strength of each field.
For details, see p. 115.
• magnetic_force1, magnetic_force2
Type: integer
Default value: 1 for both
Attribute of: top-level graph
Description:
This attribute only applies to the forcedir layout algorithm.
These two attributes specify the constant factors that are multiplied by the corresponding
magnetic forces of the two magnetic fields.
See also magnetic_field1 and magnetic_field2 (p. 79).
For details, see p. 115.
• manhattan_edges
Type: yes, no
Default value: no
Attribute of: top-level graph, subgraphs
Description:
yes switches orthogonal layout on. Orthogonal layout (or Manhattan layout) means that all
edges consist of horizontal or vertical line segments. Vertical edge segments might be shared
by several edges, while horizontal edge segments are never shared. This results in aesthetic
layouts for flowcharts. If orthogonal layout is used, the priority phase and straight phase are
also used by default (see priorty_phase, p. 81 and straight_phase, p. 85).
• margin
Type: integer
Default value: 0 if the value of borderwidth (p. 67) is zero, 3 otherwise
Attribute of: subgraphs
Description:
79