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## Kernel::ConstructPointOn_2

A model for this must provide:

Kernel::Point_2 | fo.operator() ( Kernel::Line_2 l, int i)
|  | 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.
Kernel::Point_2 | fo.operator() ( Kernel::Ray_2 r, int i)
|  | returns a point on r. point(0) is the source, point(i), with i>0, is different from the source. Precondition: i 0.
Kernel::Point_2 | fo.operator() ( Kernel::Segment_2 s, int i)
|  | 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.

### Refines

AdaptableFunctor (with two arguments)

### See Also

CGAL::Line_2<Kernel>
CGAL::Ray_2<Kernel>
CGAL::Segment_2<Kernel>

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The CGAL Project . Tue, December 21, 2004 .