/usr/lib/open-axiom/input/bouquet.input is in open-axiom-test 1.4.1+svn~2626-2ubuntu2.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 | --Copyright The Numerical Algorithms Group Limited 1994.
-- relative size of the arrow head compared to the length of the arrow
arrowScale := 0.2@DFLOAT
-- angle of the arrow head
arrowAngle := %pi-%pi/10.0@DFLOAT
-- Add an arrow head to a line segment, which starts at 'p1', ends at 'p2',
-- has length 'len', and and angle 'arg'. We pass 'len' and 'arg' as
-- arguments since they were already computed by the calling program
makeArrow(p1, p2) ==
delta := p2 - p1
len := arrowScale * length delta
theta := atan(delta.1, delta.2)
c1 := len * cos(theta + arrowAngle)
s1 := len * sin(theta + arrowAngle)
c2 := len * cos(theta - arrowAngle)
s2 := len * sin(theta - arrowAngle)
z := p2.3*(1 - arrowScale)
p3 := point [p2.1 + c1, p2.2 + s1, z, p2.4]
p4 := point [p2.1 + c2, p2.2 + s2, z, p2.4]
[[p1, p2, p3], [p2, p4]]
drawBouquet(n,title) ==
angle := 0.0@DFLOAT
sp := create3Space()$ThreeSpace(DFLOAT)
for i in 0..n-1 repeat
start := point [0.0@DFLOAT,0.0@DFLOAT,0.0@DFLOAT,angle]
end := point [cos angle, sin angle, 1.0@DFLOAT, angle]
arrow := makeArrow(start, end)
for a in arrow repeat curve(sp,a)
angle := angle + 2*%pi/n
makeViewport3D(sp,title)$VIEW3D
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