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3.4 Labels
Adding labels is easy in Asymptote; one specifies the
label as a double-quoted LaTeX string, a
coordinate, and an optional alignment direction:
size(3cm);
draw(unitsquare);
label("$A$",(0,0),SW);
label("$B$",(1,0),SE);
label("$C$",(1,1),NE);
label("$D$",(0,1),NW);
Asymptote uses the standard compass directions E=(1,0),
N=(0,1), NE=unit(N+E), and ENE=unit(E+NE), etc.,
which along with the directions up, down, right,
and left are defined as pairs in the Asymptote base
module plain (a user who has a local variable named E
may access the compass direction E by prefixing it with the name
of the module where it is defined: plain.E).
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