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############################################################################
#
# File: ptutils.icn
#
# Subject: Procedures relating to objects in 3-space
#
# Author: Ralph E. Griswold
#
# Date: March 25, 2002
#
############################################################################
#
# This file is in the public domain.
#
############################################################################
#
# These procedures provide various operations on 3-dimensional objects
# in 3-space.
#
############################################################################
#
# Links: gobject
#
############################################################################
link gobject
procedure pt2coord(p) #: convert point to coordinate
return p.x || " " || p.y || " " || p.z
end
procedure coord2pt(c) #: convert coordinate to path
local p
p := Point()
c ? {
p.x := tab(upto(' '))
move(1)
p.y := tab(upto(' '))
move(1)
p.z := tab(0)
}
return p
end
procedure negpt(p) #: negative of point
return Point(-p.x, -p.y, -p.z)
end
procedure pteq(p1, p2) #: test point equality
if p1.x = p2.x & p1.y = p2.y & p1.z = p2.z then return p2 else fail
end
procedure getpts(s) #: make point list from coordinate file
local input, pts
input := open(s) | stop("*** cannot open ", image(s))
pts := []
while put(pts, coord2pt(read(input)))
return pts
end
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