Overlays as background in textbackground

Overlays as background in textbackground

[Marco Patzer]

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Hi,

overlays are not displayed when used as a background for
textbackground. Is this a bug or are overlays not supported?

\defineoverlay [myoverlay] [\ssd Foo]

\definetextbackground [mybackgroundColour]  [background=color, backgroundcolor=gray]
\definetextbackground [mybackgroundOverlay] [background=myoverlay]

\starttext
  %% overlay works
  \framed [background=myoverlay, align=normal] {\input knuth\par}

  %% background=color works
  \startmybackgroundColour
    \input knuth
  \stopmybackgroundColour

  %% overlay is missing
  \startmybackgroundOverlay
    \input knuth
  \stopmybackgroundOverlay
\stoptext

Marco

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Re: Overlays as background in textbackground

[Wolfgang Schuster]

Am 14.07.2013 um 20:54 schrieb Marco Patzer <homerow@lavabit.com>:

> Hi,
> 
> overlays are not displayed when used as a background for
> textbackground. Is this a bug or are overlays not supported?

Overlays are a framed feature (the page background is a frame too)
and textbackgrounds are images which are drawn on the page like
overlays.

Wolfgang
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Re: Overlays as background in textbackground

[Marco Patzer]

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On 2013–07–14 Wolfgang Schuster wrote:

> Overlays are a framed feature (the page background is a frame too)
> and textbackgrounds are images which are drawn on the page like
> overlays.

MetaPost graphics can be hooked into the textbackground using the mp
and method keys. So apparently there is a way to use arbitrary
background graphics.

It would be a natural consistent interface if overlays worked with
the background key. But I assume it's due to the page break ability
of textbackground that makes it more complicated to implement.

BTW: Is there any documentation, except the source, about the mp and
method keys?

Marco

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Re: Overlays as background in textbackground

[Hans Hagen]

On 7/14/2013 8:54 PM, Marco Patzer wrote:
> Hi,
>
> overlays are not displayed when used as a background for
> textbackground. Is this a bug or are overlays not supported?

in principle we can make it pluggable (given that there is some sensible 
way to pass info and real need for it)

> \defineoverlay [myoverlay] [\ssd Foo]
>
> \definetextbackground [mybackgroundColour]  [background=color, backgroundcolor=gray]
> \definetextbackground [mybackgroundOverlay] [background=myoverlay]
>
> \starttext
>    %% overlay works
>    \framed [background=myoverlay, align=normal] {\input knuth\par}
>
>    %% background=color works
>    \startmybackgroundColour
>      \input knuth
>    \stopmybackgroundColour
>
>    %% overlay is missing
>    \startmybackgroundOverlay
>      \input knuth
>    \stopmybackgroundOverlay
> \stoptext

\definetextbackground [mybackgroundOverlay] [mp=mpos:region:whatever]

\startuseMPgraphic{mpos:region:whatever}
     for i=1 upto nofmultipars :
         draw textext("\externalfigure[cow.pdf]") rotated 10 shifted 
center multipars[i] ;
     endfor ;
\stopuseMPgraphic

\starttext

   \startmybackgroundOverlay
         \dorecurse{10}{\input knuth \par}
   \stopmybackgroundOverlay

\stoptext


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Re: Overlays as background in textbackground

[Marco Patzer]

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On 2013–07–15 Hans Hagen wrote:

> On 7/14/2013 8:54 PM, Marco Patzer wrote:
> >Hi,
> >
> >overlays are not displayed when used as a background for
> >textbackground. Is this a bug or are overlays not supported?
> 
> in principle we can make it pluggable (given that there is some
> sensible way to pass info and real need for it)

No, I don't need it.

> \definetextbackground [mybackgroundOverlay] [mp=mpos:region:whatever]
> 
> \startuseMPgraphic{mpos:region:whatever}
>     for i=1 upto nofmultipars :
>         draw textext("\externalfigure[cow.pdf]") rotated 10 shifted
> center multipars[i] ;
>     endfor ;
> \stopuseMPgraphic
> 
> \starttext
> 
>   \startmybackgroundOverlay
>         \dorecurse{10}{\input knuth \par}
>   \stopmybackgroundOverlay
> 
> \stoptext

Thanks for the example.

Marco

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Re: Overlays as background in textbackground

[Meer, Hans van der]

This code from three years back ia a reply to a question of placing an overlay background. Because the cow is very black I am curious if the \externalfigure can have a paramter to change the alpha of the cow, making it more transparent. By the way, it is not out of curiosity only. If possible it would forego the need to make separate pictures of different transparency beforehand.

> On 15 Jul 2013, at 11:22, Hans Hagen <pragma@wxs.nl> wrote:
> 
> \definetextbackground [mybackgroundOverlay] [mp=mpos:region:whatever]
> 
> \startuseMPgraphic{mpos:region:whatever}
>    for i=1 upto nofmultipars :
>        draw textext("\externalfigure[cow.pdf]") rotated 10 shifted center multipars[i] ;
>    endfor ;
> \stopuseMPgraphic
> 
> \starttext
> 
>  \startmybackgroundOverlay
>        \dorecurse{10}{\input knuth \par}
>  \stopmybackgroundOverlay
> 
> \stoptext

Hans van der Meer




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Re: Overlays as background in textbackground

[Alan BRASLAU]

Here is a trick (due to Hans, of course) to produce a watermark image.
You can play with the idea in order to produce your own effect.

\definecolor [percent] [s=1,a=1,t=.9]
\externalfigure [cow] [background={foreground,color},backgroundcolor=percent]

Alan

On Wed, 18 May 2016 11:55:11 +0000
"Meer, Hans van der" <H.vanderMeer@uva.nl> wrote:

> This code from three years back ia a reply to a question of placing
> an overlay background. Because the cow is very black I am curious if
> the \externalfigure can have a paramter to change the alpha of the
> cow, making it more transparent. By the way, it is not out of
> curiosity only. If possible it would forego the need to make separate
> pictures of different transparency beforehand.
> 
> > On 15 Jul 2013, at 11:22, Hans Hagen <pragma@wxs.nl> wrote:
> > 
> > \definetextbackground [mybackgroundOverlay]
> > [mp=mpos:region:whatever]
> > 
> > \startuseMPgraphic{mpos:region:whatever}
> >    for i=1 upto nofmultipars :
> >        draw textext("\externalfigure[cow.pdf]") rotated 10 shifted
> > center multipars[i] ; endfor ;
> > \stopuseMPgraphic
> > 
> > \starttext
> > 
> >  \startmybackgroundOverlay
> >        \dorecurse{10}{\input knuth \par}
> >  \stopmybackgroundOverlay
> > 
> > \stoptext
> 
> Hans van der Meer
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