thanks for your answer it works, but only with a "normal" circle. if the circle is xyscaled the same thing seems to bee much more complicate... here is the mp-code once again: beginfig(2); path c; pair A, B; c := fullcircle scaled 2 cm xyscaled(1.3,.8); A := (origin--(3cm,2cm)) intersectionpoint subpath (0,2) of c; B := (origin--(-5cm,1cm)) intersectionpoint subpath (2,4) of c; draw c; draw origin--B; draw origin--A; endfig; how can i clip the part of the path c between A and B in this case?? thanks for help severin

On Sun, 21 Sep 2003 21:24:04 +0200 (MEST) Severin Obertuefer wrote:

...

how can I cut the the part of the path c between A and B, so that the result is like a cheese :)

path cheese ; cheese := c rotated angle B ; cheese := cheese cutafter (origin--A) ;

Jens _______________________________________________ ntg-context mailing list ntg-context@ntg.nl http://www.ntg.nl/mailman/listinfo/ntg-context

-- +++ GMX - die erste Adresse für Mail, Message, More! +++ Getestet von Stiftung Warentest: GMX FreeMail (GUT), GMX ProMail (GUT) (Heft 9/03 - 23 e-mail-Tarife: 6 gut, 12 befriedigend, 5 ausreichend) Jetzt selbst kostenlos testen: http://www.gmx.net

that works!! thanks for the hint severin ----- Original Message ----- From: "Jens-Uwe Morawski" To: Sent: Monday, September 22, 2003 2:50 PM Subject: Re: [NTG-context] Re: [NTG-context]metapost prblem

On Mon, 22 Sep 2003 13:37:47 +0200 (MEST) "Severin Obertuefer" wrote:

...

it works, but only with a "normal" circle. if the circle is xyscaled the same thing seems to bee much more complicate... here is the mp-code once again:

beginfig(2); path c; pair A, B; c := fullcircle scaled 2 cm xyscaled(1.3,.8); A := (origin--(3cm,2cm)) intersectionpoint subpath (0,2) of c; B := (origin--(-5cm,1cm)) intersectionpoint subpath (2,4) of c; draw c; draw origin--B; draw origin--A;

draw (c cutbefore B)--(c cutafter A) withcolor red ;

...

endfig;

Jens _______________________________________________ ntg-context mailing list ntg-context@ntg.nl http://www.ntg.nl/mailman/listinfo/ntg-context

On Mon, 22 Sep 2003 13:37:47 +0200 (MEST) "Severin Obertuefer" wrote:

it works, but only with a "normal" circle. if the circle is xyscaled the same thing seems to bee much more complicate...

additionally, a more general solution: %%% \setupoutput[pdftex] \setupcolors[state=start] \startMPinclusions vardef cutbetween (expr p,a,b)= if (xpart (p intersectiontimes a))> (xpart (p intersectiontimes b)): ((p cutbefore b) cutafter a) else: (p cutbefore b)--(p cutafter a) fi enddef; \stopMPinclusions \starttext \startMPpage save c, A, B ; path c, A, B; A := (origin--(3cm,2cm)) ; B := (origin--(-5cm,1cm)) ; draw B ; draw A ; c := fullcircle scaled 2cm xyscaled(1.3,.8) ; clip currentpicture to c ; draw c withpen pencircle scaled 1.4pt withcolor .7white ; drawarrow cutbetween(c,B,A) withcolor .7green ; drawarrow cutbetween(c,A,B) withcolor green ; c := reverse c xyscaled (0.3,0.9) ; draw c withpen pencircle scaled 1.4pt withcolor .7white ; drawarrow cutbetween(c,B,A) withcolor .7red ; drawarrow cutbetween(c,A,B) withcolor red ; \stopMPpage \stoptext %%% Jens