size(8cm,0);
import arrows_pi;
EdgeHead=EdgeHookHead();

real i=0;
draw((0,0)--(1,0), EdgeArrows());
draw((1,.25)--(0,.25), EdgeArrows, p=green);
draw((0,0.5)--(1,0.5), EdgeArrows(Relative(.75), space=4bp), p=orange);
draw((1,0.75)--(0,0.75), EdgeArrows(Relative(.75), space=4bp), p=grey);
draw((1,1)--(0,1), EdgeArrows(Relative(.25), space=4bp), p=Magenta);
draw((0,1.25)--(1,1.25), EdgeArrows(space=2mm), p=1mm+deepcyan);
draw((0,1.5)..(.5,1.75)..(1,1.5), EdgeArrows(size=5mm), p=purple);

draw((0.5,0)--(.5,1), EdgeArrows(), p=red);
draw((0,0)--(1,1), EdgeArrows(size=5mm,NoFill,position=Relative(.85)), p=blue);