Re: textbackground

[Hans Hagen <pragma@wxs.nl>]

dr. Hans van der Meer wrote:

>
> On 26-jun-04, at 20:13, Hans Hagen Outside wrote:
>
>> dr. Hans van der Meer wrote:
>>
>>> Hans,
>>>
>>> I definitely see problems  with the 
>>> \starttextbackground[]-\stoptextbackground environment (discussed in 
>>> the "displays"-brochure).
>>>
>>> When the textbackground falls at a page crossing -- i.e. starts at 
>>> the top of a page -- the coloring extends backwards on the page just 
>>> left.
>>> It can be remedied by putting a \null just in front of 
>>> \starttextbackground. The extra vertical space this introduces just 
>>> manages to constrain the background to its own page. However, this 
>>> is not a general solution, on other places the extra vertical space 
>>> is certainly not wanted.
>>>
>>> I cannot find the exact nature of the problem. I suspect it has to 
>>> do with the \output-routines, but these are not my speciality, to 
>>> say the least. So, not much help there,
>>>
>>> Also, the \starttextbackground does not respect footnotes, these are 
>>> colored. In contrast, the old \startbackground-\stopbackground does 
>>> respect footnotes. The coloring stops at the footnote and restarts 
>>> at the next page. I should like that for \starttextbackground as well.
>>
>>
>> can you make me a minimal example of where things go wrong (keep in 
>> mind that there are two methods, tex and paragraph)
>> with respect to footnotes, maybe i can make that an option (there are 
>> more exceptions)
>> Hans
>>
>
> Here is the smallest one I could construct that shows the page 
> crossing effect. I used the "location=paragraph". With "location=text" 
> I did not experiment.
> Here follows the code:
>
> % testing textbackgroundcolor
> \setupbodyfont[12pt]    % using the default cmr font
> \setuppapersize[S6][S6]
> \setuplayout[width=middle,location=middle,header=0pt,footer=4ex]
> \setuppagenumbering[location={footer,inright},alternative=singlesided]
> %
> \setupcolors [state=start]
> \definecolor [lavender]        [r=.901961,g=.901961,b=.980392]
> \definecolor [lavenderblush]    [r=1,g=.941176,b=.960784]
> % general page coloring
>
> \setupbackgrounds[page][background=color,backgroundcolor=lavenderblush]
> %
> % special background coloring for parts of the text
> \definetextbackground[A][frame=off,location=paragraph,
>     backgroundcolor=lavender,backgroundoffset=0pt]
> \starttext
> %
> \dorecurse{10}{Some text that must fill a portion of the page. }\par
> \dorecurse{10}{Some text that must fill a portion of the page. }\par
> \dorecurse{10}{Some text that must fill a portion of the page. }\par
> %
> % WITH 8 AND 9 IN THE NEXT RECURSION THE FIRST PARAGRAPH ON PAGE 2 HAS
> % THE BACKGROUND COLORED BUT THE WHITESPACE BELOW THE LAST PARAGRAPH ON
> % PAGE 1 IS COLORED TOO.
> % CHANGE THE 8/9 TO 10 AND THE COLORING ON PAGE 1 DISPAPPEARS.
> % I HAVE BECOME ACROSS SITUATIONS WERE THE COLORING EXTENDED STILL
> % FURTHER BACK OVER MORE PRECEDING PARAGRAPHS, BUT IT IS DIFFICULT TO
> % CONSTRUCT A MINIMAL EXAMPLE FOR THAT.
> \dorecurse{9}{Some text that must fill a portion of the page. }\par
> %
> % THIS SHOULD COLOR THE FIRST PARAGRAPH ON PAGE 2
> \starttextbackground[A]
> \dorecurse{5}{Text with the background. }
> \stoptextbackground
> \dorecurse{10}{Some text that must fill a portion of the page. }\par
> %
> \stoptext
>
> I hope you can find what causes it, because I like the effects.

i think i found a way out and will send you a test file

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
-----------------------------------------------------------------