Re: mkiv and MetaPost

[Otared Kavian <otared@gmail.com>]

On 14 janv. 09, at 08:57, Taco Hoekwater wrote:

> Otared Kavian wrote:
>> Thanks Aditya for your explanation, but I must say that it is not  
>> convincing because with mkiv one of the buffers is processed with  
>> \processMPbuffer, while the other is not… So there must be some  
>> other hidden behaviour which has changed between mkii and mkiv.
>
> I will leave it for Hans to figure what exactly goes wrong, but the  
> problem is caused by the comment characters in the axes-1 buffer.
>
> Best wishes,
> Taco

Hi Taco,

Thanks for finding the problem: indeed as you point out, in the  
minimal example which I reproduce below, one sees that the comment  
character
	%
in the \startbuffer[axes-2] part is not interpreted correctly in mkiv:  
if one puts that character at the end of last line of the buffer the  
ouput is correct, while if one puts it at the end of other lines the  
result is "undefined".

So for the file I have to typeset right now, I'll remove those nasty  
"%", but I hope that the problem will be solved in mkiv…
By the way, in one of your messages some time ago you said that there  
is a command
	\luatexversion
but it doesn't exist on my installation: is it removed or I understod  
wrong?

Best wishes: OK

%%%%% bug-metapost-1.tex
%!TEX TS-program = mkiv
\setupcolors[state=start]

\starttext

\startbuffer[axes-1]
numeric u ; u := .5cm ;
path xox ; xox := (-u,0)--(8u,0) ;
path yoy ; yoy := (0,-u)--(0,7u) ;
draw xox withcolor blue ;
draw yoy withcolor blue ;
\stopbuffer

\startbuffer[axes-2]
numeric u ; u := .5cm ;
path xox ; xox := (-u,0)--(8u,0) ;
path yoy ; yoy := (0,-u)--(0,7u) ;
draw xox withcolor blue ; % <------ here is the problem
draw yoy withcolor blue ;
\stopbuffer

This file has been typeset
on \currentdate{}
at \currenttime,
with
\doifmodeelse{mkiv}
	{mkiv,
	LuaTeX revision \luatexrevision,
	(LuaTeX date stamp \luatexdatestamp)}
	{mkii,
	using the command:
	\type{texexec basic-test.tex}},
ConTeXt version \contextversion.
% LuaTeX version \luatexversion,

\blank[2*big]

This MetaPost graphic is shown correctly with mkiv:
\placefigure[middle][-]{}{\processMPbuffer[axes-1]} {}

\blank
but not this one
\placefigure[middle][-]{}{\processMPbuffer[axes-2]} {}

\stoptext

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