File: Ccurve.m4

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.PS
# Ccurve.m4
gen_init
# Gosper C curve

`define' c_curve {if $3==0 then { continue by ($1,$2) } else {
    c_curve( ($1-$2)/2, ($1+$2)/2, $3-1)
    c_curve( ($1+$2)/2, ($2-$1)/2, $3-1)}}

line from 0,4 to 0,4
c_curve(0,4,10)

.PE