This class returns two connected straight lines. There is a vast variety of combinations for angle- and length-keywords. The user has to make sure to provide a non-ambiguous set of keywords:
absangle1 or relangle1 for the first angle,
relangleM for the middle angle and
absangle2 or relangle2 for the ending angle.
Again, the absolute angle overrides the relative if both are given. (Default:
all five angles are None)
length1 and length2 for the lengths of the connecting lines.
(Default: None)