s a b indicates that an input point at coordinates a b
was seen.
l a b c
indicates a line with equation ax + by = c.
v a b indicates a vertex at a b.
e l v1 v2
indicates a Voronoi segment which is a subsegment
of line number l with endpoints numbered v1 and v2.
If v1 or v2 is -1, the line extends to infinity.
The other options are:
s The input is sorted by y coordinate (the second
number in the pair). The first input line should
be npoints xmin xmax ymin ymax. This describes the
number of points and the range of the points. This
line is used to determine internal hash table size;
it need not be exact but performance suffers if it
is grossly wrong.
p Produce output suitable for input to plot (1),
rather than the forms described above.
On unsorted data uniformly distributed in the unit square,
s.sweep uses about 20n+140/n bytes of storage. On sorted
data, s.sweep uses about 160/n bytes.
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