Asymptote/Command/plain/Relative

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[edit] side Relative(explicit pair align);

side Leftside= Relative(W);
side Center=Relative((0,0))
side RightSide=Relative(E);

[edit] 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);