size(8cm,0);
import arrows_pi;

transform T=shift(0,-0.125);
path g=(0,0)--(1,0);
int i=-1;

draw(T^(++i)*g, EdgeArrows());
draw(T^(++i)*g, 0.8*green, EdgeArrows(EdgeSimpleHead));
draw(T^(++i)*g, 0.8*red, EdgeArrows(EdgeSimpleHead,size=5mm));

draw(T^(++i)*g, EdgeArrows(EdgeHookHead));
draw(T^(++i)*g, 0.8*green, EdgeArrows(EdgeHookHead,size=5mm));
draw(T^(++i)*g, 0.8*red, EdgeArrows(EdgeHookHead(barb=20),size=5mm));
draw(T^(++i)*g, 0.8*blue, EdgeArrows(EdgeHookHead(dir=60),size=5mm));

size(8cm,0);
import arrows_pi;

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);

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);

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

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,position=Relative(.85)), p=blue);