PS
# Wheel.m4
# https://tex.stackexchange.com/questions/605178/drawing-a-directed-wheel-graph-with-tikz
gen_init

 linethick = 1.6
 nnodes = 9
 brad = 2
 srad = circlerad/2
 P: circle rad srad at (1,0.5) fill_(0.75)
 A: Rect_(brad,90+360/nnodes)
 for i=1 to nnodes do {
   B: circle invis shaded "lightgray" at Rect_(brad,90-(i-1)/nnodes*360) \
     sprintf("\Huge %g",i)
   line from B to P chop circlerad chop srad
   line from B to A chop
   A: B
   }

PE

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