CGAL::Ray_2<Kernel>

Definition

²

Creation

Ray_2<Kernel> r ( Point_2<Kernel> p, Point_2<Kernel> q);
	introduces a ray r with source $$p and passing through point $$q.
Ray_2<Kernel> r ( Point_2<Kernel> p, Direction_2<Kernel> d);
	introduces a ray r starting at source $$p with direction $$d.
Ray_2<Kernel> r ( Point_2<Kernel> p, Vector_2<Kernel> v);
	introduces a ray r starting at source $$p with the direction of $$v.
Ray_2<Kernel> r ( Point_2<Kernel> p, Line_2<Kernel> l);
	introduces a ray r starting at source $$p with the same direction as $$l.

Operations

bool	r.operator== ( h)
		Test for equality: two rays are equal, iff they have the same source and the same direction.
bool	r.operator!= ( h)
		Test for inequality.
Point_2<Kernel>	r.source ()	returns the source of r.
Point_2<Kernel>	r.point ( 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.
Direction_2<Kernel>
	r.direction ()	returns the direction of r.
Vector_2<Kernel>	r.to_vector ()	returns a vector giving the direction of r.
Line_2<Kernel>	r.supporting_line ()
		returns the line supporting r which has the same direction.
Ray_2<Kernel>	r.opposite ()	returns the ray with the same source and the opposite direction.

Predicates

bool	r.is_degenerate ()	ray r is degenerate, if the source and the second defining point fall together (that is if the direction is degenerate).
bool	r.is_horizontal ()
bool	r.is_vertical ()
bool	r.has_on ( Point_2<Kernel> p)
		A point is on r, iff it is equal to the source of r, or if it is in the interior of r.
bool	r.collinear_has_on ( Point_2<Kernel> p)
		checks if point $$p is on r. This function is faster than function has_on() if the precondition checking is disabled. Precondition: $$p is on the supporting line of r.

Miscellaneous

Ray_2<Kernel>	r.transform ( Aff_transformation_2<Kernel> t)
		returns the ray obtained by applying $$t on the source and on the direction of r.

See Also