simple usage of \hpos

simple usage of \hpos

[Peter Münster]

Hello,

How can I place an element as background at a previously defined position?

Here a test-file to show what I'm looking for:

\definelayer[graphics][position=yes]
\setupbackgrounds[page][background=graphics]
\starttext
Here is some text. I would like to appear a graphics exactly
behind \hpos{XXX}{HERE}. How can I do this, without measuring by hand the
x- and y-offsets, and perhaps also without using metapost?

Such a command would be fine: \type{\placeatpos[XXX]{my background
    figure}}, or \type{\setlayer[graphics][location=XXX]{...}}.

\setlayer[graphics][dx=128mm, dy=-27mm]{\externalfigure[hacker.jpg][width=1cm]}
\stoptext

TIA for any help!
Cheers, Peter

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Re: simple usage of \hpos

[Wolfgang Schuster]

Am 06.02.10 23:17, schrieb Peter Münster:
> Hello,
>
> How can I place an element as background at a previously defined position?
>
> Here a test-file to show what I'm looking for:
>
> \definelayer[graphics][position=yes]
> \setupbackgrounds[page][background=graphics]
> \starttext
> Here is some text. I would like to appear a graphics exactly
> behind \hpos{XXX}{HERE}. How can I do this, without measuring by hand the
> x- and y-offsets, and perhaps also without using metapost?

untested:

\newcounter\BackgroundPictures

\definelayer[BackgroundPicture][width=\paperwidth,height=\paperheight]

\def\FixedPicture
   {\dodoubleempty\doFixedPicture}

\def\doFixedPicture[#1][#2]%
   {\doglobal\increment\BackgroundPictures
    \xypos{fixedpicture:\BackgroundPictures}%
    \doifnotmode{first}
      {\setlayer
         [BackgroundPicture]
         [x=\MPx{fixedpicture:\BackgroundPictures},
          y=\MPy{fixedpicture:\BackgroundPictures}]
         {\externalfigure[#1][#2]}}}

\setupbackgrounds[page][background=BackgroundPicture]

\starttext

... \FixedPicture[...] ...

\stoptext

Wolfgang
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Re: simple usage of \hpos

[Peter Münster]

On Sun, Feb 07 2010, Wolfgang Schuster wrote:

> \newcounter\BackgroundPictures
>
> \definelayer[BackgroundPicture][width=\paperwidth,height=\paperheight]
>
> \def\FixedPicture
>   {\dodoubleempty\doFixedPicture}
>
> \def\doFixedPicture[#1][#2]%
>   {\doglobal\increment\BackgroundPictures
>    \xypos{fixedpicture:\BackgroundPictures}%
>    \doifnotmode{first}
>      {\setlayer
>         [BackgroundPicture]
>         [x=\MPx{fixedpicture:\BackgroundPictures},
>          y=\MPy{fixedpicture:\BackgroundPictures}]
>         {\externalfigure[#1][#2]}}}
>
> \setupbackgrounds[page][background=BackgroundPicture]
>
> \starttext
>
> ... \FixedPicture[...] ...
>
> \stoptext

Hello Wolfgang,

No, it does not work. The main idea, to position the layer with
x=\MPx{} and y=\MPy{} seems to be broken.

Smaller test-file:

\definelayer[graphics][position=yes]
\setupbackgrounds[page][background=graphics]
\starttext
I would like to appear a graphics exactly 2cm left from he\xypos{XXX}re.

\setlayer[graphics][x=\MPx{XXX}, y=\MPy{XXX}, dx=-2cm]{%
  \externalfigure[hacker.jpg][width=1cm]}
\stoptext

Any other ideas?

Thanks, Peter

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Contact information: http://pmrb.free.fr/contact/


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Re: simple usage of \hpos

[Wolfgang Schuster]

Am 07.02.10 13:22, schrieb Peter Münster:
> The main idea, to position the layer with x=\MPx{} and y=\MPy{} seems to be broken.
>
> Smaller test-file:
>
> \definelayer[graphics][position=yes]
> \setupbackgrounds[page][background=graphics]
> \starttext
> I would like to appear a graphics exactly 2cm left from he\xypos{XXX}re.
>
> \setlayer[graphics][x=\MPx{XXX}, y=\MPy{XXX}, dx=-2cm]{%
>    \externalfigure[hacker.jpg][width=1cm]}
> \stoptext
>
> Any other ideas?

Remove the 'position=yes' setup and correct the coordinates, layers use 
the top left corner as origin but positions are measures from the left 
bottom corner.

\definelayer[graphics]

\setupbackgrounds[page][background=graphics]

\starttext

I would like to appear a graphics exactly 2cm left from he\xypos{XXX}re.

\setlayer
   [graphics]
   [x=\the\dimexpr\MPx{XXX}-2cm\relax,
    y=\the\dimexpr\paperheight-\MPy{XXX}-\strutht\relax]
   {\externalfigure[hacker.jpg][width=1cm]}

\stoptext

Wolfgang
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___________________________________________________________________________________

Re: simple usage of \hpos

[Peter Münster]

On Sun, Feb 07 2010, Wolfgang Schuster wrote:

> Remove the 'position=yes' setup and correct the coordinates, layers use the 
> top left corner as origin but positions are measures from the left bottom 
> corner.

Ah, now I see, why the graphics was at the bottom before.

Thank you very much!

Here an example to show how I use it:

\usemodule[pre-stepwise]
\setupinteraction[state=start]
\definelayer[myBG]
\setupbackgrounds[page][background=myBG]
\def\PlaceAtPos{\dosingleempty\doPlaceAtPos}
\def\doPlaceAtPos[#1]#2#3{%
  \getparameters[PAA][dx=0pt, dy=0pt, #1]%
  \setbox\scratchbox\hbox{#3}%
  \setlayer[myBG][%
    x=\the\dimexpr\MPx{#2} - 0.5\wd\scratchbox\relax,
    y=\the\dimexpr\paperheight-\MPy{#2}-\ht\scratchbox\relax,
    dx=\PAAdx, dy=\PAAdy]{#3}}

\starttext
Place something exactly 2cm left from he\xypos{XXX}re.

Place something exactly 1 line below he\xypos{YYY}re.

Place something exactly he\xypos{ZZZ}re.

\StartSteps
\PlaceAtPos[dx=-2cm]{XXX}{\red something}           \FlushStep
\PlaceAtPos[dy=\lineheight]{YYY}{\green something}  \FlushStep
\PlaceAtPos{ZZZ}{\blue something}                   \FlushStep
\StopSteps
\stoptext

Cheers, Peter

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Contact information: http://pmrb.free.fr/contact/


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Re: simple usage of \hpos

[Wolfgang Schuster]

Am 07.02.10 15:26, schrieb Peter Münster:

> \def\doPlaceAtPos[#1]#2#3{%
>    \getparameters[PAA][dx=0pt, dy=0pt, #1]%
>    \setbox\scratchbox\hbox{#3}%
>    \setlayer[myBG][%
>      x=\the\dimexpr\MPx{#2} - 0.5\wd\scratchbox\relax,
>      y=\the\dimexpr\paperheight-\MPy{#2}-\ht\scratchbox\relax,
>      dx=\PAAdx, dy=\PAAdy]{#3}}

\def\doPlaceAtPos[#1]#2%
   {\dowithnextbox
      {\setlayer
         [myBG]
         [x=\the\dimexpr\MPx{#2}-\nextboxwd/2\relax,
          y=\the\dimexpr\paperheight-\MPy{#2}-\nextboxht\relax,
          #1]
         {\flushnextbox}}
    \normalhbox}

Wolfgang
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___________________________________________________________________________________

Re: simple usage of \hpos

[Peter Münster]

On Sun, Feb 07 2010, Wolfgang Schuster wrote:

>> \def\doPlaceAtPos[#1]#2#3{%
>>    \getparameters[PAA][dx=0pt, dy=0pt, #1]%
>>    \setbox\scratchbox\hbox{#3}%
>>    \setlayer[myBG][%
>>      x=\the\dimexpr\MPx{#2} - 0.5\wd\scratchbox\relax,
>>      y=\the\dimexpr\paperheight-\MPy{#2}-\ht\scratchbox\relax,
>>      dx=\PAAdx, dy=\PAAdy]{#3}}
>
> \def\doPlaceAtPos[#1]#2%
>   {\dowithnextbox
>      {\setlayer
>         [myBG]
>         [x=\the\dimexpr\MPx{#2}-\nextboxwd/2\relax,
>          y=\the\dimexpr\paperheight-\MPy{#2}-\nextboxht\relax,
>          #1]
>         {\flushnextbox}}
>    \normalhbox}

Thank you for this \dowithnextbox command!
(I keep \getparameters... because I want to use it for other parameters
outside of \setlayer)

Cheers, Peter

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Contact information: http://pmrb.free.fr/contact/


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