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import graph;
size(200,100,IgnoreAspect);
markroutine marks() {
return new void(picture pic=currentpicture, frame f, path g) {
path p=scale(1mm)*unitcircle;
for(int i=0; i <= length(g); ++i) {
pair z=point(g,i);
frame f;
if(i % 4 == 0) {
fill(f,p);
add(pic,f,z);
} else {
if(z.y > 50) {
pic.add(new void(frame F, transform t) {
path q=shift(t*z)*p;
unfill(F,q);
draw(F,q);
});
} else {
draw(f,p);
add(pic,f,z);
}
}
}
};
}
pair[] f={(5,5),(40,20),(55,51),(90,30)};
draw(graph(f),marker(marks()));
scale(true);
xaxis("$x$",BottomTop,LeftTicks);
yaxis("$y$",LeftRight,RightTicks);
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