externalfigure

externalfigure

[Jan-Mark Batke]

Dear list, 

using mptopdf 

externalfigure "nue-logo-1.jpg" scaled 10;

results in a figure  that doesn't retain the original image
ratio. 

The hints given on

http://wiki.contextgarden.net/Using_Graphics

would be what I want, but don't work in metapost?! 

Any help would be appreciated

Jan-Mark

Re: externalfigure

[Patrick Gundlach]

Hello Jan-Mark,

> using mptopdf 
>
> externalfigure "nue-logo-1.jpg" scaled 10;
>
> results in a figure  that doesn't retain the original image
> ratio. 

[...]

I don't think it is possible. As far as I can see, the externalfigure
command just includes a reference to the figure and metapost never
touches (reads) the picture, only the next step (mptopdf) does. So
metapost has no idea of the image attributes.


Patrick

(Standard disclaimer: usually, when I write something like this, Hans
posts a followup with some yet unknown tricks.)
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Re: Re: externalfigure

[Vit Zyka]

Patrick Gundlach wrote:

> Hello Jan-Mark,
> 
> 
>>using mptopdf 
>>
>>externalfigure "nue-logo-1.jpg" scaled 10;
>>
>>results in a figure  that doesn't retain the original image
>>ratio. 
> 
> 
> [...]
> 
> I don't think it is possible. As far as I can see, the externalfigure
> command just includes a reference to the figure and metapost never
> touches (reads) the picture, only the next step (mptopdf) does. So
> metapost has no idea of the image attributes.
> 
> Patrick

If you do not specify BOTH width and height of the image the pdftex have 
to read image SIZE from the image file.

Metafun's externalfigure is very trickery macro. Image can't be loaded 
by MP. Instead of that MP writes only MP special information (like TeX 
\special) with several parameters. This info is read by ConTeXt when 
including MP graphic. It inserts image file and does image transformations.

So I thing the case should work as expected. Could you send 
complete-and-minimal example?

Vit Zyka

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Re: externalfigure

[Patrick Gundlach]

[...]

> So I thing the case should work as expected. Could you send
> complete-and-minimal example?

\starttext
\startMPcode
externalfigure "hacker.jpg" scaled 300;
\stopMPcode
\stoptext


where hacker.jpg is from the official samples.

P.
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Re: Re: externalfigure

[Hans Hagen]

Patrick Gundlach wrote:

>[...]
>
>  
>
>>So I thing the case should work as expected. Could you send
>>complete-and-minimal example?
>>    
>>
>
>\starttext
>\startMPcode
>externalfigure "hacker.jpg" scaled 300;
>\stopMPcode
>\stoptext
>
>
>where hacker.jpg is from the official samples.
>  
>

its possible to use the natural size, but i found out that the code that 
i use for that  is not in the distribution (will be in the next zip)

This will create a dimensions file mpfigs.mp: 

\startmode[*first] 
  \executesystemcommand{texexec --fig=d *.jpg} 
\stopmode

\starttext
\startMPcode
input mpfigs.mp ;
naturalfigure("hacker.jpg") ;
\stopMPcode
\stoptext

Hans 

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                                          Hans Hagen | PRAGMA ADE
              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                             | www.pragma-pod.nl
-----------------------------------------------------------------

Re: Re: externalfigure

[Vit Zyka]

>>So I thing the case should work as expected. Could you send
>>complete-and-minimal example?
> 
> 
> \starttext
> \startMPcode
> externalfigure "hacker.jpg" scaled 300;
> \stopMPcode
> \stoptext

It seems to me the behaviour is perhaps not intuitive but correct. I try 
to explain:

Imagine externalfigure without scaling:
   externalfigure "hacker.jpg";
What we will obtain? One can imagine the image in its natural size. That 
  is not the case. We obtain the image of the size 1pt x 1pt. I thing 
there are two reasons for that:
1) Analogy. Imagine this example:
      draw origin--(1,0)--(1,1)--(0,1)--cycle;
    it is exactly the same as
      draw origin--(1pt,0)--(1pt,1pt)--(0,1pt)--cycle;
    and it is abbreviated to
      draw unitsquare;
    and im most cases it is used with scaling
      draw unitsquare xscaled 2cm yscaled 1cm;
    since
      scaled X = xscaled X yscaled X
    then
      unitsquare scaled 2cm
    is still square.

    If you do not specify the unit, the pt is deduced.
    So there is an analogy:
      "unitfigure" 1pt x 1pt = externalfigure "file"

2) Technician. The scaling dimensions are calculated by TeX engine.
    It is done by tricks in pt units, so image 1pt x 1pt simplifies
    the calculations.

If you want to use a bitmap in ConTeXt MP environment in its natural 
size, I suggest to precalculate (according to Hans macro \MPfigure) its 
dimmensions:

% ------------------------------------
\def\getMPfiguresize#1{%
    \getfiguredimensionsonly[#1]%
    \freezedimenmacro\naturalfigurewidth
    \freezedimenmacro\naturalfigureheight
}
\def\naturalMPfigure#1{%
   externalfigure "#1"
     xscaled \naturalfigurewidth\space
     yscaled \naturalfigureheight\space
}
\starttext
\getMPfiguresize{hacker.jpg}
\startMPcode
   \naturalMPfigure{hacker.jpg} ; % space in front of ; is important!!
\stopMPcode
\startMPcode
   \naturalMPfigure{hacker.jpg} scaled 2 slanted .3;
\stopMPcode
\stoptext
%-------------------------

Vit Zyka

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     Automatic document typesetting
     Automaticka sazba dokumentu --
--

space in \inmargin

[Martin Kolarík]

Hi all,

there is probably somewhere a space in some macro called inside \inmargin.
See example:

\starttext

\setbox0\hbox{\inmargin{XX}}

\showbox0

A\box0 B

\stoptext

and a part of log with \showbox0:

\hbox(10.41603+4.05064)x3.91663
.\glue 3.91663 plus 1.95831 minus 1.30554
.\hbox(10.41603+4.05064)x0.0
...

The first glue inside hbox seems to be product of \inmargin. Does somebody
know where the space is? I did not dig into sources yet,

have a nice day and thanks,

Martin

Re: Re: externalfigure

[Jan-Mark Batke]

Hello Vit, hello list, 

thanks for the suggestions, they are working fine. As I can
recognize its  a good idea to  embed my metapost  code in a
context file. 

Best regards

Jan-Mark
-- 

Re: space in \inmargin

[Hans Hagen]

Martin � wrote:

>Hi all,
>
>there is probably somewhere a space in some macro called inside \inmargin.
>See example:
>
>\starttext
>
>\setbox0\hbox{\inmargin{XX}}
>
>\showbox0
>
>A\box0 B
>
>\stoptext
>
>and a part of log with \showbox0:
>
>\hbox(10.41603+4.05064)x3.91663
>.\glue 3.91663 plus 1.95831 minus 1.30554
>.\hbox(10.41603+4.05064)x0.0
>...
>
>The first glue inside hbox seems to be product of \inmargin. Does somebody
>know where the space is? I did not dig into sources yet,
>
>have a nice day and thanks,
>  
>

a simpler way to test this is:

  \ruledhbox{\inmargin{XX}}

on my machine it works ok, do you use the alpha release? (That one has a new implementation of marginal things; definable and configurable) 


Hans 

-----------------------------------------------------------------
                                          Hans Hagen | PRAGMA ADE
              Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | fax: 038 477 53 74 | www.pragma-ade.com
                                             | www.pragma-pod.nl
-----------------------------------------------------------------