import graph_pi;

size(7cm);
scale(false);

grid(xmin=-2, xmax=4,
     ymin=-2, ymax=4,
     xStep=1, xstep=.5,
     yStep=1, ystep=.5,
     pTick=.7bp+.6red,
     ptick=dashed+.8orange,
     above=false
     );
labeloij(p=1.7bp+.5red,
         arrow=Arrow(7bp),
         dot(0.5*blue)
         );