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Kernel::Point_2
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fo.operator() ( Kernel::Line_2 l, int i)
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returns an arbitrary point on l. It holds
point(i) == point(j), iff i==j.
Furthermore, is directed from point(i)
to point(j), for all i < j.
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Kernel::Point_2
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fo.operator() ( Kernel::Ray_2 r, int i)
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returns a point on r. point(0) is the source,
point(i), with i>0, is different from the
source.
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Kernel::Point_2
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fo.operator() ( Kernel::Segment_2 s, int i)
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returns source or target of s: point(0) returns
the source of s, point(1) returns the target of s.
The parameter i is taken modulo 2, which gives
easy access to the other end point.
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