missing btex ..etex in mp figure

missing btex ..etex in mp figure

[luigi scarso]

In

\starttext
\startTEXpage
\startlua
metapost.process("metafun",{"beginfig(1);",
"a=.7in; b=0.5in;",
"z0=(0,0); z1=(a,0); z2=(0,b);",
"z0=.5[z1,z3]=.5[z2,z4];",
"draw z1..z2..z3..z4..cycle;",
"drawarrow z0..z1;",
"drawarrow z0..z2;",
"label.top(btex $a$ etex, .5[z0,z1]);",
"label.lft(btex $b$ etex, .5[z0,z2]);",
"endfig;"})
\stoplua
\stopTEXpage
\stoptext

there are no labels, but I believe that it's wrong.


-- 
luigi
it's new .
it's powerful .
it's luatex .
http://www.luatex.org
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Re: missing btex ..etex in mp figure

[Taco Hoekwater]

luigi scarso wrote:
> In
> 
> \starttext
> \startTEXpage
> \startlua
> metapost.process("metafun",{"beginfig(1);",
> "a=.7in; b=0.5in;",
> "z0=(0,0); z1=(a,0); z2=(0,b);",
> "z0=.5[z1,z3]=.5[z2,z4];",
> "draw z1..z2..z3..z4..cycle;",
> "drawarrow z0..z1;",
> "drawarrow z0..z2;",
> "label.top(btex $a$ etex, .5[z0,z1]);",
> "label.lft(btex $b$ etex, .5[z0,z2]);",
> "endfig;"})
> \stoplua
> \stopTEXpage
> \stoptext
> 
> there are no labels, but I believe that it's wrong.

The MPlib library embedded in luatex does not actually
support btex .. etex blocks.

It is planned to intercept such blocks in the mkiv lua
code, but for now, just use textext().

Best wishes,
Taco

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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: missing btex ..etex in mp figure

[Hans Hagen]

Taco Hoekwater wrote:
> 
> luigi scarso wrote:
>> In
>>
>> \starttext
>> \startTEXpage
>> \startlua
>> metapost.process("metafun",{"beginfig(1);",
>> "a=.7in; b=0.5in;",
>> "z0=(0,0); z1=(a,0); z2=(0,b);",
>> "z0=.5[z1,z3]=.5[z2,z4];",
>> "draw z1..z2..z3..z4..cycle;",
>> "drawarrow z0..z1;",
>> "drawarrow z0..z2;",
>> "label.top(btex $a$ etex, .5[z0,z1]);",
>> "label.lft(btex $b$ etex, .5[z0,z2]);",
>> "endfig;"})
>> \stoplua
>> \stopTEXpage
>> \stoptext
>>
>> there are no labels, but I believe that it's wrong.
> 
> The MPlib library embedded in luatex does not actually
> support btex .. etex blocks.
> 
> It is planned to intercept such blocks in the mkiv lua
> code, but for now, just use textext().

why not use

\starttext
\startMPpage
a=.7in; b=0.5in;
z0=(0,0); z1=(a,0); z2=(0,b);
z0=.5[z1,z3]=.5[z2,z4];
draw z1..z2..z3..z4..cycle;
drawarrow z0..z1;
drawarrow z0..z2;
label.top(btex $a$ etex, .5[z0,z1]);
label.lft(btex $b$ etex, .5[z0,z2]);
endfig;
\stopMPpage
\stoptext

this uses:

metapost.graphic(mpsformat,str,preamble)

which does intercept the btex/etex


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___________________________________________________________________________________
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://tex.aanhet.net
archive  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: missing btex ..etex in mp figure

[luigi scarso]

Ok.
In next example, f>0 is hide


\starttext
\startTEXpage\startMPcode
%beginfig(2);

h=2in; w=2.7in;
path p[], q[], pp;
for i=1.5,2,4:
  ii := i**2;
  p[i] = (w/ii,h){1/ii,-1}...(w/i,h/i)...(w,h/ii){1,-1/ii};
endfor
for i=.5,1.5:
  q[i] = origin..(w,i*h) cutafter p1.5;
endfor

pp = buildcycle(q0.5, p2, q1.5, p4);

fill pp withcolor .8white;
z0=center pp;
picture lab; lab=thelabel(btex $f>0$ etex, z0);
unfill bbox lab; draw lab;
draw q0.5; draw p2; draw q1.5; draw p4;
makelabel.top(btex $P$ etex, p2 intersectionpoint q0.5);
makelabel.rt(btex $Q$ etex, p2 intersectionpoint q1.5);
%endfig;
\stopMPcode\stopTEXpage
\stoptext

-- 
luigi
it's new .
it's powerful .
it's luatex .
http://www.luatex.org
___________________________________________________________________________________
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://tex.aanhet.net
archive  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________