import math;
import markers;

size(6cm,0);

// Définition de styles de points
marker croix=marker(scale(3)*cross(4),
                     1bp+gray);

add(grid(6,6,.8lightgray));

pair pA=(1,1), pB=(5,5), pC=(2,4);
 
draw(pA--pB--pC--cycle);
draw("$A$",pA,SW,blue,croix);  
draw("$B$",pB,SE,blue,croix);  
draw("$C$",pC,NW,croix);

draw(pA--pC,StickIntervalMarker(1,2,size=8,angle=-45,red));
draw(pB--pC,StickIntervalMarker(1,2,size=8,angle=-45,red));