* A question about whatever (Metapost)
@ 2020-01-25 23:09 Fabrice Couvreur
2020-01-26 17:25 ` Alan Braslau
0 siblings, 1 reply; 2+ messages in thread
From: Fabrice Couvreur @ 2020-01-25 23:09 UTC (permalink / raw)
To: mailing list for ConTeXt users
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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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* Re: A question about whatever (Metapost)
2020-01-25 23:09 A question about whatever (Metapost) Fabrice Couvreur
@ 2020-01-26 17:25 ` Alan Braslau
0 siblings, 0 replies; 2+ messages in thread
From: Alan Braslau @ 2020-01-26 17:25 UTC (permalink / raw)
To: Fabrice Couvreur; +Cc: mailing list for ConTeXt users
What error are you getting?
(perhaps you need "save carre,p,a,b,c,d,N,P,M ;")
A perpendicular line is also the line "rotated 90" (about the intersection point).
Alan
On Sun, 26 Jan 2020 00:09:38 +0100
Fabrice Couvreur <fabrice1.couvreur@gmail.com> wrote:
> 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
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________
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