PS
# Sierpinski.m4
gen_init
[
define Sierpinski {
if $1 > 0.04 then {
d = $1/2-lh
shade(1,line from $2+(d/2,d/2*s3+lw*2) right d/2 up d/2*s3 then left d*2 \
then right d down d*s3 then right d/2 up d/2*s3 )
Sierpinski($1/2,$2-($1/2,0))
Sierpinski($1/2,$2+($1/2,0))
Sierpinski($1/2,$2+(0,$1*s3/2))
}
}
r = 3
linethick = 0.2
#linethick = 1/2 /(1pt__)
lw = linethick pt__ /2
s3 = sqrt(3)
lh = lw*s3
A: 3,3
d = r/2-lh
shade(0,line from A+(0,lw) right d then up d*s3 left d then down d*s3 left d\
then right d )
ifpstricks(`psset_(linecolor=white)')
Sierpinski(r/2,A)
# CayleyGraph.m4
[
define CayleyGraph {
if $3 > 0 then {
{ line to Here+(cosd($2),sind($2))*($1)
exec sprintf("CayleyGraph(%g,%g,%g);", ($1)/2, $2, $3-1); }
{ line to Here+(cosd($2+90),sind($2+90))*($1)
exec sprintf("CayleyGraph(%g,%g,%g);", ($1)/2, $2+90, $3-1); }
{ line to Here+(cosd($2-90),sind($2-90))*($1)
exec sprintf("CayleyGraph(%g,%g,%g);", ($1)/2, $2-90, $3-1); }
}
}
size = 2
depth = 6
for t=0 to 270 by 90 do {
line from (0,0) to (cosd(t),sind(t))*size/2;
{ exec sprintf("CayleyGraph(%g,%g,%g);",size/4,t,depth); }
}
] scaled 3/4 with .sw at last [].se+(-0.25,0)
