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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: fo(s,0)
returns the source of s, fo(s,1) returns the target
of s. The parameter i is taken modulo 2.
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Kernel::Point_2
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fo.operator() ( Kernel::Iso_rectangle_2 r, int i)
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returns the i'th vertex of
r in counterclockwise order, starting with the lower left
vertex. The parameter i is taken modulo 4.
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Kernel::Point_2
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fo.operator() ( Kernel::Triangle_2 t, int i)
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returns the i'th vertex of t. The parameter
i is taken modulo 3.
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