| Description: |
fixed (default) should be used, if port sharing is used, because then, only a fixed set of rotations for the arrow heads are
used. If the arrow mode is free, then each arrow head is rotated individually to each edge. But this can yield to a black
spot, where nothing is recognizable, if port sharing is used, since all these differently rotated arrow heads are drawn at
the same place. If the arrow mode is fixed, then the arrow head is rotated only in steps of 45 degree, and only one arrow
head occurs at each port.
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