Hi,
> Le 25 déc. 2020 à 08:48, Jairo A. del Rio <jairoadelr...@gmail.com> a écrit :
>
> Hi, list. I've got a question about paths and intersections. The following:
>
> \starttext
> \startMPpage
> path p[];
>
> p[1] = fullcircle scaled 2cm;
> p[2] = unitsquare shifted (4cm,6cm);
>
> if (known (p[1] intersectionpoint p[2])):
>
> draw textext("yes");
>
> else:
>
> draw textext("no");
> fi;
>
> \stopMPpage
> \stoptext
>
> yields an error message: "The paths don't intersect". Is there a way to
> intercept this error message and trigger an action instead? Thank you in
> advance.
Instead of using « intersectionpoint » use « Intersectiontimes », this will
give you the « time » of the intersection of the two paths. If the paths do not
intersect, than the value is (-1,-1). So you could do something like:
pair checkintersec ;
checkintersec := p[1] intersectiontimes p[2] ;
If xpart(checkintersec) <> -1 :
draw textext("yes »);
else:
draw textext(« non »);
fi;
Fabrice.
>
> Best regards,
>
> Jairo
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If your question is of interest to others as well, please add an entry to the
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