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Depending on which Cgal kernel is used, different versions of this global function are available. This is described below.
With the basic 2D and 3D Kernel (see Chapter 11)
| Comparison_result | compare_y_at_x ( Point_2<Kernel> p, Line_2<Kernel> h) | |||
compares the y-coordinates of p and the vertical projection
of p on h, see (d) in the figure
below.
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| Comparison_result | compare_y_at_x ( Point_2<Kernel> p, Line_2<Kernel> h1, Line_2<Kernel> h2) | |||
compares the y-coordinates of the vertical projection
of p on h1 and on h2, see (e) in the figure
below.
| ||||
| Comparison_result | compare_y_at_x ( 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 y-coordinates of p and
the vertical projection of p on h, see (f) in the figure
below.
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| Comparison_result | compare_y_at_x ( 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 y-coordinates of the vertical projection of p on
h1 and on h2, see (g) in the figure
below.
| ||||
| Comparison_result | compare_y_at_x ( Point_2<Kernel> p, Segment_2<Kernel> s) | |||
compares the y-coordinates of p and the vertical projection
of p on s. If s is vertical, then return
EQUAL when p lies on s, SMALLER when p lies
under s, and LARGER otherwise.
| ||||
| Comparison_result | compare_y_at_x ( Point_2<Kernel> p, Segment_2<Kernel> s1, Segment_2<Kernel> s2) | |||
compares the y-coordinates of the vertical projection
of p on s1 and on s2. If s1 or s2
is vertical, then return EQUAL if they intersect, otherwise return
SMALLER if s1 lies below s2, and return LARGER
otherwise.
| ||||
With the 2D Circular Kernel (see Chapter 13)
#include <CGAL/global_functions_circular_kernel_2.h>
If this kernel is used, in addition to the function and the combination of 2D types described above, another version of the function is provided.
| Comparison_result | compare_y_at_x ( Circular_arc_point_2<CircularKernel> p, Circular_arc_2<CircularKernel> a) | |
| Same as above, for a point and a circular arc. | ||
| Comparison_result | compare_y_at_x ( Circular_arc_point_2<CircularKernel> p, Line_arc_2<CircularKernel> a) | |
| Same as above, for a point and a line segment. | ||