// import geometry_dev; // extension devenue l'extension geometry officielle
import geometry;        // le 12/05/09, dans la version 1.71 d'asymptote. :-))

import graph_pi;

unitsize(1.5cm,1.5cm);

scale(false);
real xmin=-2, xmax=3, ymin=-3, ymax=4;
grid(xmin, xmax, ymin, ymax,
     xStep=1, xstep=.5,
     yStep=1, ystep=.5,
     pTick=.7bp+.7white,
     ptick=.7bp+dotted+.7white,
     above=false
     );
draw((xmin,0)--(xmax,0)^^(0,ymin)--(0,ymax),
     1.3bp+0.7*grey);
labeloij(p=1.7bp+.5*red,
         arrow=Arrow(SimpleHead,8bp),
         scale(2)*Mark(5)
         );
line d1=line(2,-2);
draw(Label("$(d_1)$",Relative(.95),align=NW), d1,
     1bp+solid+.5blue);
line d2=line(-1,2);
draw(Label("$(d_2)$",Relative(.95),align=SW), d2,
     1bp+dashed+.8red);
line d3=line(1/5,-1);
draw(Label("$(d_3)$",Relative(.05),align=N), d3,
     1bp+dotted+.8green);