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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