5 Graph Description Language (GDL) - Absint
5 Graph Description Language (GDL) - Absint
5 Graph Description Language (GDL) - Absint
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6.4.4 Edge Bending<br />
If a graph contains nodes of different sizes, an edge starting at a very small node may be drawn<br />
through a neighbored large node. This situation is avoided by bending edges at certain points. In<br />
addition, if an orthogonal layout method is selected, the edges are bent so that only orthogonal line<br />
segments exist.<br />
6.5 Drawing<br />
Finally, the graph is drawn in a window or exported to a file. Edges can be drawn as polygon<br />
segments or splines, however spline drawing is slower (indicated by the d message).<br />
Export into PostScript, SVG, or bitmap formats (BMP, PNG, etc. ) is also possible.<br />
6.6 Message Characters<br />
<strong>Graph</strong> layout and drawing is a rather complex process. aiSee issues messages in the form of a<br />
single character to indicate its state (see Table 7). This is useful in following the progress of layout<br />
calculation and for tuning layout speed (see p. 40).<br />
Key Phase<br />
a Parsing<br />
q Force-directed layout<br />
f Folding<br />
p Rank Assignment<br />
u Unmerge Connected Components<br />
b Crossing Reduction, Phase 1<br />
B Crossing Reduction, Phase 2<br />
l Local Crossing Optimization<br />
T Tree Layout<br />
m Pendulum Method<br />
c Rubberband Method<br />
d Spline Drawing<br />
S Straight-Line Phase<br />
e Edge Bending<br />
t Timeout<br />
x PostScript Export Operation<br />
Table 7: Layout Phases and Message Characters<br />
120
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