Asymptote/命令/plain/Relative

side Relative(explicit pair align);

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

position Relative(real position);

位置 Relative(real) 指定相对于路径总弧长的位置。这些方便的缩写是预定义的

position BeginPoint=Relative(0);
position MidPoint=Relative(0.5);
position EndPoint=Relative(1);