latex定义了结点noderectangle draw=black line width=1pt A at -10 A;noderectangle draw=black line width=1pt B at 10 B;现在要连接两个结点draw A--B;draw B--A;但我希望两条能作区分A到B的连线先往上再往右再往下B到A的连线先往下再往右再往上使用path实现

\path (A) -- (B) coordinate[midway] (AB); \draw (A) -- ++(0,1) -| (AB) |- ++(0,-1); \path (B) -- (A) coordinate[midway] (BA); \draw (B) -- ++(0,-1) -| (BA) |- ++(0,1);