CGAL::compare_x_at_y

Comparison_result	compare_x_at_y ( Point_2<Kernel> p, Line_2<Kernel> h)
		compares the $$x-coordinates of $$p and the horizontal projection of p on h; see (a) in the figure below. Precondition: h is not horizontal.
Comparison_result	compare_x_at_y ( Point_2<Kernel> p, Line_2<Kernel> h1, Line_2<Kernel> h2)
		This function compares the $$x-coordinates of the horizontal projection of p on h1 and on h2; see (b) in the figure below. Precondition: h1 and h2 are not horizontal.
Comparison_result	compare_x_at_y ( Line_2<Kernel> l1, Line_2<Kernel> l2, Line_2<Kernel> h)
		Let $$p be the intersection of lines $$l1 and $$l2. This function compares the $$x-coordinates of $$p and the horizontal projection of p on h; see (c) in the figure below. Precondition: l1 and l2 intersect and are not horizontal; h is not horizontal.
Comparison_result	compare_x_at_y ( Line_2<Kernel> l1, Line_2<Kernel> l2, Line_2<Kernel> h1, Line_2<Kernel> h2)
		Let $$p be the intersection of lines $$l1 and $$l2. This function compares the $$x-coordinates of the horizontal projection of p on h1 and on h2; see (d) in the figure below. Precondition: l1 and l2 intersect and are not horizontal; h1 and h2 are not horizontal.

See Also