chickadee » linear-algebra » collinear?

define-structure line-segment p qrecord
p lprocedure
q lprocedure
collinear? l1 l2procedure
point-on-line-segment? r lprocedure
intersection-point l1 l2procedure
cross? l1 l2procedure
intersect? l1 l2procedure
line-tangent lprocedure
normal-2d lprocedure
line-segment-length lprocedure
read-line-segments-from-file pathnameprocedure
write-line-segments-to-file line-segments pathnameprocedure