Hi,
The point M is such that the line (CM) is perpendicular to the line (NP).
I do not understand the error of this code.
Thank you
Fabrice
\usecolors[xwi]
\starttext
\startMPcode
path carre, p;
carre = unitsquare scaled 138;
pair a, b, c, d, N, P, M;
a = point 0 of carre;
b = point 1 of carre;
c = point 2 of carre;
d = point 3 of carre;
p = b -- d;
N = whatever[a,d];
P = whatever[a,b];
M = whatever[b,d];
(M - c) dotprod (P - N) = 0;
draw M -- c;
draw p withcolor \MPcolor{navy};
draw carre withcolor \MPcolor{firebrick};
label.lft("$A$", point 0 of carre);
label.lrt("$B$", point 1 of carre);
label.urt("$C$", point 2 of carre);
label.ulft("$D$", point 3 of carre);
\stopMPcode
\stoptext
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