Re: Is there any way to make alternate rows of a table have a light gray background?

[Blake McBride]

I have corrected all of the issues.  See the attached.

Thanks.

Blake


On Sat, Nov 20, 2021 at 2:30 PM Blake McBride <blake@mcbride.name> wrote:

> Hi Tadziu,
>
> Using the code you so graciously supplied, I am having a problem.  The
> problem occurs when your table spans pages.  Since you are creating the
> gray line _after_ the current line, sometimes you get an extra gray line on
> the first page, and other times you get a double gray line on the second
> page.
>
> See the attached example.  I am running it with:  groff -t -mm -Tpdf
> test.groff >test.pdf
>
> In it, you can see an extra gray line at the end of the first page.  If
> you change the top margin to .5i from 1i, you get a double gray line on the
> second page instead.
>
> I think all of this is caused by the creation of the gray box _after_ the
> current line.  In my case, I always produce PDF files and the lines are
> always the same height.
>
> If there is a way to affect the current line rather than the "next" line,
> I think the problem would go away.  I am not good enough with groff escape
> sequences to easily do this.  Could you please help me with this?  I would
> really appreciate it!
>
> Thank you!
>
> Blake McBride
>
>
> On Wed, Jun 9, 2021 at 7:31 AM Tadziu Hoffmann <
> hoffmann@usm.uni-muenchen.de> wrote:
>
>>
>> > The data is simple, but the table is wide and the data
>> > occurs in a right triangle shape, with one point at the
>> > top left, another point at the top right, and the other
>> > point at the bottom right.  This means that it is hard to
>> > accurately follow from the row heading on the left to the
>> > appropriate column on the right.
>>
>> > Is there any way to make alternate rows of a table have a
>> > light gray background?
>>
>> It is possible only with some trickery, and it's easier
>> if all the lines have the same height, otherwise much more
>> manual intervention will be necessary.  To make this fully
>> automatic will probably require modifying tbl.
>>
>> In the attached example, the gray background is created by
>> drawing filled boxes across the width of the table.  In fact,
>> the background is drawn in advance for the *next* line, in
>> order to prevent the horizontal line from being painted over,
>> which can happen at low resolutions; however, this requires
>> two slightly different versions of the fill because the line
>> spacing is different around the horizontal line.
>>
>> TW is the width of the table and is set by tbl.  LW is a
>> correction for (half) the line width and is only necessary
>> because I'm using square linecaps.
>>
>>
>>

test.groff
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