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compares the -coordinates of and the vertical projection
of p on h, see (d) in the figure
below. Precondition: h is not vertical. | ||||
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This function compares the -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. | ||||
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Let be the
intersection
of lines and .
This function compares the -coordinates of and
the vertical projection of p on h, see (f) in the figure
below. Precondition: l1, l2 intersect and h is not vertical. | ||||
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Let be the
intersection
of lines and . This function
compares the -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. | ||||
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compares the -coordinates of 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. Precondition: p is within the x range of s. | ||||
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This function compares the -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. Precondition: p is within the x range of s1 and s2. |