<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/1.9.4/p5.js"></script>
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setup=_=>{
createCanvas(350,250)
stroke(127);
d=Array(160).fill(100)
R=3.14/180
for(Y=-180;Y<181;Y+=6){for(X=-180;X<181;X+=4){
r=R*sqrt(X*X+Y*Y)
Z=100*cos(r)-30*cos(3*r)
x=~~(80+X/3-Y/6)
y=~~(40-Y/6-Z/4)
if(x<0|x>160|d[x]<y)continue
point(x*2,y*2)
d[x]=y
}}}//#つぶやきprocessing