Have a look at g_canvas.c (not 100% shure...), there is some code that draws the connection between an outlet and the inlet. Just change the coordinates for the single straight line to coordintes for three seperate lines. To make the segments user moveable would be a bit more tricky.
Olaf
if anyone were to actually pull this off in its full glory they'd surely receive the adoration thousands of pd users... and i guarantee as many drinks of your choice at your favorite bar if you live in the bay area :)