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.PS
# Star.m4
# https://tex.stackexchange.com/questions/605132/how-can-i-insert-a-nine-pointed-star-in-a-latex-document
gen_init
# star(keys)
# keys: size=expr;
# points=expr;
# angle=expr; last convex vertex ang
# depth=expr; inner vertex fraction
# line=attributes;
define(`star',`[ pushkeys_(`$1',
`size:linewid; points:5; angle:90; depth:1/(m4points-1); line::N')
dang = 360/m4points
T: (Rect_(m4size/2*m4depth,m4angle+dang/2)) # concave inner vertex
S: 1/2 between T and (Rect_(m4size/2,m4angle))
U: (Rect_(m4size/2,m4angle+dang)) # convex outer vertex
line m4line from S to T then to U
for i=1 to m4points-1 do {
T: (Rect_(m4size/2*m4depth,m4angle+i*dang+dang/2))
U: (Rect_(m4size/2,m4angle+(i+1)*dang))
continue to T then to U }
continue to S; popdef(`size',`points',`angle',`depth',`m4line')]')
linewid = linewid*2
ifelse(1,1,`
star
star(size=1)
star(points=4)
star(depth=1/4)
star(line=outlined "red")
star(points=8)
star(points=9;line=outlined "red" shaded "magenta")
')
#for_(3,8,1,`
#star(points=m4x;line=outlined "red" shaded "magenta")')
.PE
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