The constructor takes both angle- and bulge-keywords. Here, the bulges are used as distances between the control points of the cubic Beziér-curve. For the signs of the angle- and bulge-keywords refer to figure 7.1.
absangle1 or relangle1
absangle2 or relangle2, where the absolute angle overrides the
relative if both are given. (Default: relangle1=45,
relangle2=45, absangle1=None, absangle2=None)
absbulge and relbulge, where they will be added if both are
given.
(Default: absbulge=None, relbulge=0.39; these default
values produce output similar to the defaults of arc.)
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