Metapost

* Metapost - Seems like weird behavior. Is it a bug?
@ 2009-11-25  4:45 Curiouslearn
  2009-11-25  7:13 ` luigi scarso
  0 siblings, 1 reply; 6+ messages in thread
From: Curiouslearn @ 2009-11-25  4:45 UTC (permalink / raw)
  To: mailing list for ConTeXt users

The code below shows a cyclic path that I am interested in creating
(it is in red if you run the code). The example works fine as long as
I have, u:=1cm, as in the code below. But if I replace it by ,
u:=0.6cm, there is no output. There is an error saying that paths 4
and 3 do not intersect. Is this a bug?

Thanks for your help.

\setuppapersize[letter][letter]
\setuplayout[leftedge=0in,leftmargin=1in,leftmargindistance=0in,rightmargin=1in,rightmargindistance=0in,rightedge=0in,leftedgedistance=0in,rightedgedistance=0in,topspace=0.5in,width=6.5in,height=10in]

\setupcolors[state=start]

\starttext

\startuseMPgraphic{buildS22}
	numeric u;
	u := 1cm;
	w:= 2pt;
	path xaxis; path yaxis;
	xaxis := (0,0)--(12,0) scaled u;
	yaxis := (0,0)--(0,12) scaled u;
	path stLine;
	path Curve;
	stLine :=
			function (1,"x","10-x",0,10,1) scaled u;
	Curve :=
			function(1,"x","2+8/x",1,10,0.1) scaled u;
	drawarrow xaxis withpen pencircle scaled w;
	drawarrow yaxis	withpen pencircle scaled w;	
	draw stLine withpen pencircle scaled w withcolor 0.5red;
	draw Curve withpen pencircle scaled w withcolor 0.5green;
	pair Lint[];
	Lint[1]:=yaxis intersectionpoint stLine;
	Lint[2]:=stLine intersectionpoint Curve;
	Lint[3]:=reverse stLine intersectionpoint Curve;
	Lint[4]:=stLine intersectionpoint xaxis;
	path cyclicPath;
	cyclicPath := buildcycle(Lint[1]--Lint[2],Curve,Lint[3]--Lint[4],reverse
xaxis,yaxis);
	draw cyclicPath withpen pencircle scaled 5pt withcolor red;
\stopuseMPgraphic
\useMPgraphic{buildS22}

\stoptext
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