411 REFERENCE · Wikibooks
Asymptote/Command/plain/Relative
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side Relative(explicit pair align);
side Leftside= Relative(W);
side Center=Relative((0,0))
side RightSide=Relative(E);
position Relative(real position);
The position Relative(real) specifies a location relative to the total arclength of the path. These convenient abbreviations are predefined:
position BeginPoint=Relative(0);
position MidPoint=Relative(0.5);
position EndPoint=Relative(1);