horoffset + itemize + positiongraphics = misaligned graphics

horoffset + itemize + positiongraphics = misaligned graphics

[Stuart Jansen]

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I'm working on a rather complex document containing frequent use of
positional graphics. Unfortunately, I've discovered what I expect will
be a pretty nasty problem to fix. When I combine horoffset,
startitemize, & positiongraphics the graphics are placed in the wrong
spot. I've managed to cook up the simple test case below which
demonstrates the problem.

===============
\setuplayout[ horoffset=.5cm ]
\setuppagenumbering[alternative=doublesided]
\setupcolors[state=start]

\defineoverlay [backgraphics] [\positionoverlay{backgraphics}]
\setupbackgrounds[page][background=backgraphics]
\newcounter\CurrentCallout
\startMPpositiongraphic{mypos:line}
  path p ; initialize_box(\MPpos{\MPvar{from}}) ;
  p := lrxy..urxy..ulxy..cycle ;
  p := center p shifted (-.5cm,0mm) -- center p ;
  pickup pencircle scaled 2pt ;
  drawarrow p withcolor red ;
  anchor_box(\MPanchor{\MPvar{from}}) ;
\stopMPpositiongraphic
\def\myitem%
{\doglobal\increment\CurrentCallout\item
 \hpos{myitem:b:\CurrentCallout}{\strut}
 \startpositionoverlay{backgraphics}
  \setMPpositiongraphic{myitem:b:\CurrentCallout}{mypos:line}
 \stoppositionoverlay}

\starttext
\startitemize[n,serried]
\dorecurse{30}{\myitem\input tufte }
\stopitemize
\stoptext
===============

-- 
Stuart Jansen <sjansen@gurulabs.com>
Guru Labs, L.C.

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Re: horoffset + itemize + positiongraphics = misaligned graphics

[Hans Hagen]

Stuart Jansen wrote:

>I'm working on a rather complex document containing frequent use of
>positional graphics. Unfortunately, I've discovered what I expect will
>be a pretty nasty problem to fix. When I combine horoffset,
>startitemize, & positiongraphics the graphics are placed in the wrong
>spot. I've managed to cook up the simple test case below which
>demonstrates the problem.
>
>===============
>\setuplayout[ horoffset=.5cm ]
>\setuppagenumbering[alternative=doublesided]
>\setupcolors[state=start]
>
>\defineoverlay [backgraphics] [\positionoverlay{backgraphics}]
>\setupbackgrounds[page][background=backgraphics]
>\newcounter\CurrentCallout
>\startMPpositiongraphic{mypos:line}
>  path p ; initialize_box(\MPpos{\MPvar{from}}) ;
>  p := lrxy..urxy..ulxy..cycle ;
>  p := center p shifted (-.5cm,0mm) -- center p ;
>  pickup pencircle scaled 2pt ;
>  drawarrow p withcolor red ;
>  anchor_box(\MPanchor{\MPvar{from}}) ;
>\stopMPpositiongraphic
>\def\myitem%
>{\doglobal\increment\CurrentCallout\item
> \hpos{myitem:b:\CurrentCallout}{\strut}
> \startpositionoverlay{backgraphics}
>  \setMPpositiongraphic{myitem:b:\CurrentCallout}{mypos:line}
> \stoppositionoverlay}
>
>\starttext
>\startitemize[n,serried]
>\dorecurse{30}{\myitem\input tufte }
>\stopitemize
>\stoptext
>  
>

where do you assign a value to "from"?

what effect do you want to achieve?

Hans

-- 

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Re: horoffset + itemize + positiongraphics = misaligned graphics

[Stuart Jansen]

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On Sun, 2005-07-17 at 23:39 +0200, Hans Hagen wrote:
> >I'm working on a rather complex document containing frequent use of
> >positional graphics. Unfortunately, I've discovered what I expect will
> >be a pretty nasty problem to fix. When I combine horoffset,
> >startitemize, & positiongraphics the graphics are placed in the wrong
> >spot. I've managed to cook up the simple test case below which
> >demonstrates the problem.

> where do you assign a value to "from"?

My impression from the metafun manual is that is it is set by
\setMPpositiongraphic . Replacing "from" with "self" produces the same
result. The use of "from" was a side effect of me trimming a more
complex document down to a simple, isolated example.

> what effect do you want to achieve?

I want to draw attention to certain lines/paragraphs. I can use several
work arounds, but I wanted to report the bug with a good test case.

-- 
Stuart Jansen <sjansen@gurulabs.com>
Guru Labs, L.C.

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