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+size(12cm,0);
+
+void distance(picture pic=currentpicture, pair A, pair B, Label L="", real n=0,
+ pen p=currentpen)
+{
+ real d=3mm;
+ path g=A--B;
+ transform T=shift(-n*d*unit(B-A)*I);
+ pic.add(new void(frame f, transform t) {
+ picture opic;
+ path G=T*t*g;
+ draw(opic,Label(L,Center,UnFill(1)),G,p,Arrows(NoFill),Bars,PenMargins);
+ add(f,opic.fit());
+ });
+ pic.addBox(min(g),max(g),T*min(p),T*max(p));
+}
+
+pair A=(0,0), B=(3,3);
+
+dot(A);
+dot(B);
+
+distance(A,B,"$\ell$",1);