CGAL::compare_y_at_x

Comparison_result	compare_y_at_x ( Point_2<R> p, Line_2<R> h)
		compares the $$y-coordinates of $$p and the vertical projection of p on h, see (d) in the figure below. Precondition: h is not vertical.
Comparison_result	compare_y_at_x ( Point_2<R> p, Line_2<R> h1, Line_2<R> h2)
		compares the $$y-coordinates of the vertical projection of p on h1 and on h2, see (e) in the figure below. Precondition: h1 and h2 are not vertical.
Comparison_result	compare_y_at_x ( Line_2<R> l1, Line_2<R> l2, Line_2<R> h)
		Let $$p be the intersection of lines $$l1 and $$l2. This function compares the $$y-coordinates of $$p and the vertical projection of p on h, see (f) in the figure below. Precondition: l1, l2 intersect and h is not vertical.
Comparison_result	compare_y_at_x ( Line_2<R> l1, Line_2<R> l2, Line_2<R> h1, Line_2<R> h2)
		Let $$p be the intersection of lines $$l1 and $$l2. This function compares the $$y-coordinates of the vertical projection of p on h1 and on h2, see (g) in the figure below. Precondition: l1 and l2 intersect; h1 and h2 are not vertical.

See Also