offset for background overlay

offset for background overlay

[mf]

Hello list,
this MWE is a simplified version of a real case:

\startuseMPgraphic{cell:triangle}
   path p ; p := unittriangle rotated 90 xscaled 2.5 OverlayWidth 
yscaled 2.5 OverlayHeight ;
   draw p withcolor red ;
\stopuseMPgraphic
\defineoverlay[triangle][{\uniqueMPgraphic{cell:triangle}}]
\starttext
\bTABLE[frame=off]
   \bTR
     \bTD[nx=2,background=triangle,align=middle] \dontleavehmode a\crlf 
text \eTD
   \eTR
   \bTR[toffset=1mm]
     \bTD left \eTD
     \bTD right \eTD
   \eTR
\eTABLE
\stoptext

The triangle is used as background of the 2-column wide cell of the 
first row.

I want the triangle to go around the second row too, as if it were a 
frame for all the 3 cells. It means that it should be shifted down a bit.

So I tried this:

\startuseMPgraphic{cell:triangle}
   path p ; p := unittriangle rotated 90 xscaled 2.5 OverlayWidth 
yscaled 2.5 OverlayHeight ;
   draw p shifted (0,-3mm) withcolor red ;
\stopuseMPgraphic
...

but it does not work, because the content of the background is centered 
on the cell, so "shifted (0,-3mm)" has no effect.

The only solution I found is drawing something above the triangle with a 
neutral color, so that the whole background is centered in the cell and 
the red triangle goes down:

\startuseMPgraphic{cell:triangle}
   path p ; p := unittriangle rotated 90 xscaled 2.5 OverlayWidth 
yscaled 2.5 OverlayHeight ;
   fill p shifted (0,6mm) withcolor white ; % only to move the next one down
   draw p withcolor red ;
\stopuseMPgraphic
\defineoverlay[triangle][{\uniqueMPgraphic{cell:triangle}}]
\starttext
\bTABLE[frame=off]
   \bTR
     \bTD[nx=2,background=triangle,align=middle] \dontleavehmode a\crlf 
text \eTD
   \eTR
   \bTR[toffset=1mm]
     \bTD left \eTD
     \bTD right \eTD
   \eTR
\eTABLE
\stoptext

It's a dirty trick. I'm sure there's a cleaner way.
Does anybody know it?

Thanks,
Massi
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Re: offset for background overlay

[Hans Hagen]

On 4/11/2020 4:15 PM, mf wrote:
> Hello list,
> this MWE is a simplified version of a real case:
> 
> \startuseMPgraphic{cell:triangle}
>    path p ; p := unittriangle rotated 90 xscaled 2.5 OverlayWidth 
> yscaled 2.5 OverlayHeight ;
>    draw p withcolor red ;
> \stopuseMPgraphic
> \defineoverlay[triangle][{\uniqueMPgraphic{cell:triangle}}]
> \starttext
> \bTABLE[frame=off]
>    \bTR
>      \bTD[nx=2,background=triangle,align=middle] \dontleavehmode a\crlf 
> text \eTD
>    \eTR
>    \bTR[toffset=1mm]
>      \bTD left \eTD
>      \bTD right \eTD
>    \eTR
> \eTABLE
> \stoptext
here's a very ugly solution

\startuseMPgraphic{cell:triangle}
     fill llcorner OverlayBox
         -- lrcorner OverlayBox
         -- (center bottomboundary OverlayBox shifted 
(0,\MPy{foo:2}-\MPh{foo:2}+\MPd{foo:2}-\MPy{foo:1}))
         -- cycle
         withcolor red ;
     setbounds currentpicture to OverlayBox ;
\stopuseMPgraphic

\defineoverlay[triangle][{\uniqueMPgraphic{cell:triangle}}]

\starttext

\bTABLE[frame=off]
   \bTR
     \bTD[nx=2,align=middle,height=0pt,background=triangle]\xypos{foo:1}\eTD
   \eTR
   \bTR
     \bTD[nx=2,align=middle] \dontleavehmode a\crlf text \eTD
   \eTR
   \bTR[toffset=1mm]
     \bTD \hpos{foo:2}{\strut} left \eTD
     \bTD right \eTD
   \eTR
\eTABLE

\stoptext

it is probably possible to get some info otherwise (more efficient) if 
really needed (if we add some helpers)

Hans


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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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Re: offset for background overlay

[Wolfgang Schuster]

Hans Hagen schrieb am 11.04.2020 um 19:41:
> On 4/11/2020 4:15 PM, mf wrote:
>> Hello list,
>> this MWE is a simplified version of a real case:
>>
>> \startuseMPgraphic{cell:triangle}
>>    path p ; p := unittriangle rotated 90 xscaled 2.5 OverlayWidth 
>> yscaled 2.5 OverlayHeight ;
>>    draw p withcolor red ;
>> \stopuseMPgraphic
>> \defineoverlay[triangle][{\uniqueMPgraphic{cell:triangle}}]
>> \starttext
>> \bTABLE[frame=off]
>>    \bTR
>>      \bTD[nx=2,background=triangle,align=middle] \dontleavehmode 
>> a\crlf text \eTD
>>    \eTR
>>    \bTR[toffset=1mm]
>>      \bTD left \eTD
>>      \bTD right \eTD
>>    \eTR
>> \eTABLE
>> \stoptext
> here's a very ugly solution
> 
> \startuseMPgraphic{cell:triangle}
>      fill llcorner OverlayBox
>          -- lrcorner OverlayBox
>          -- (center bottomboundary OverlayBox shifted 
> (0,\MPy{foo:2}-\MPh{foo:2}+\MPd{foo:2}-\MPy{foo:1}))
>          -- cycle
>          withcolor red ;
>      setbounds currentpicture to OverlayBox ;
> \stopuseMPgraphic
> 
> \defineoverlay[triangle][{\uniqueMPgraphic{cell:triangle}}]
> 
> \starttext
> 
> \bTABLE[frame=off]
>    \bTR
>      
> \bTD[nx=2,align=middle,height=0pt,background=triangle]\xypos{foo:1}\eTD
>    \eTR
>    \bTR
>      \bTD[nx=2,align=middle] \dontleavehmode a\crlf text \eTD
>    \eTR
>    \bTR[toffset=1mm]
>      \bTD \hpos{foo:2}{\strut} left \eTD
>      \bTD right \eTD
>    \eTR
> \eTABLE
> 
> \stoptext
> 
> it is probably possible to get some info otherwise (more efficient) if 
> really needed (if we add some helpers)

Simpler, put the table in a frame.

\startuseMPgraphic{cell:triangle}
   draw llcorner OverlayBox
     -- lrcorner OverlayBox
     -- center topboundary OverlayBox
     -- cycle
        withcolor red ;
\stopuseMPgraphic

\defineoverlay[triangle][{\uniqueMPgraphic{cell:triangle}}]

\starttext

\startframed[frame=off,offset=1ex,loffset=2ex,roffset=2ex,toffset=2ex,background=triangle]
     \bTABLE[frame=off]
         \bTR
             \bTD[nx=2,align=middle] a\crlf text \eTD
         \eTR
         \bTR[toffset=1mm]
             \bTD left \eTD
             \bTD right \eTD
         \eTR
     \eTABLE
\stopframed

\stoptext

Wolfgang
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Re: offset for background overlay

[mf]

Thanks Hans and Wolfgang.

@Wolfgang: your solution is clearer, but unfortunately it works only for 
this MWE. In the real case the triangle extends over 2 rows, but the 
table has more than 2 rows.
I tried grouping the first two rows in a 
\bTABLEbody[background=triangle], but it doesn't work.

@both: \setupoverlay[hoffset=...,voffset=...]?
\setupframed[backgroundhoffset=...,backgroundvoffset=...] (\bTD inherits 
from \framed)?
Or maybe a method in MP to set the bounding box of the resulting overlay?

\setupframed has already a backgroundoffset option, whose value can be:

- a DIMENSION (an offset that is both horizontal and vertical)

- a "frame": what does it mean? (I looked into pack-rul.mkiv, with no 
results)

Massi

Il 11/04/20 20:11, Wolfgang Schuster ha scritto:
> Hans Hagen schrieb am 11.04.2020 um 19:41:
>> On 4/11/2020 4:15 PM, mf wrote:
>>> Hello list,
>>> this MWE is a simplified version of a real case:
>>>
>>> \startuseMPgraphic{cell:triangle}
>>>    path p ; p := unittriangle rotated 90 xscaled 2.5 OverlayWidth 
>>> yscaled 2.5 OverlayHeight ;
>>>    draw p withcolor red ;
>>> \stopuseMPgraphic
>>> \defineoverlay[triangle][{\uniqueMPgraphic{cell:triangle}}]
>>> \starttext
>>> \bTABLE[frame=off]
>>>    \bTR
>>>      \bTD[nx=2,background=triangle,align=middle] \dontleavehmode 
>>> a\crlf text \eTD
>>>    \eTR
>>>    \bTR[toffset=1mm]
>>>      \bTD left \eTD
>>>      \bTD right \eTD
>>>    \eTR
>>> \eTABLE
>>> \stoptext
>> here's a very ugly solution
>>
>> \startuseMPgraphic{cell:triangle}
>>      fill llcorner OverlayBox
>>          -- lrcorner OverlayBox
>>          -- (center bottomboundary OverlayBox shifted 
>> (0,\MPy{foo:2}-\MPh{foo:2}+\MPd{foo:2}-\MPy{foo:1}))
>>          -- cycle
>>          withcolor red ;
>>      setbounds currentpicture to OverlayBox ;
>> \stopuseMPgraphic
>>
>> \defineoverlay[triangle][{\uniqueMPgraphic{cell:triangle}}]
>>
>> \starttext
>>
>> \bTABLE[frame=off]
>>    \bTR
>> \bTD[nx=2,align=middle,height=0pt,background=triangle]\xypos{foo:1}\eTD
>>    \eTR
>>    \bTR
>>      \bTD[nx=2,align=middle] \dontleavehmode a\crlf text \eTD
>>    \eTR
>>    \bTR[toffset=1mm]
>>      \bTD \hpos{foo:2}{\strut} left \eTD
>>      \bTD right \eTD
>>    \eTR
>> \eTABLE
>>
>> \stoptext
>>
>> it is probably possible to get some info otherwise (more efficient) if 
>> really needed (if we add some helpers)
> 
> Simpler, put the table in a frame.
> 
> \startuseMPgraphic{cell:triangle}
>    draw llcorner OverlayBox
>      -- lrcorner OverlayBox
>      -- center topboundary OverlayBox
>      -- cycle
>         withcolor red ;
> \stopuseMPgraphic
> 
> \defineoverlay[triangle][{\uniqueMPgraphic{cell:triangle}}]
> 
> \starttext
> 
> \startframed[frame=off,offset=1ex,loffset=2ex,roffset=2ex,toffset=2ex,background=triangle] 
> 
>      \bTABLE[frame=off]
>          \bTR
>              \bTD[nx=2,align=middle] a\crlf text \eTD
>          \eTR
>          \bTR[toffset=1mm]
>              \bTD left \eTD
>              \bTD right \eTD
>          \eTR
>      \eTABLE
> \stopframed
> 
> \stoptext
> 
> Wolfgang
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Re: offset for background overlay

[Wolfgang Schuster]

mf schrieb am 11.04.2020 um 23:59:
> Thanks Hans and Wolfgang.
> 
> @Wolfgang: your solution is clearer, but unfortunately it works only for 
> this MWE. In the real case the triangle extends over 2 rows, but the 
> table has more than 2 rows.
> I tried grouping the first two rows in a 
> \bTABLEbody[background=triangle], but it doesn't work.

How about nested tables:

\starttext

\bTABLE[width=1cm,height=1cm]
     \bTR
         \bTD A \eTD
         \bTD B \eTD
         \bTD C \eTD
         \bTD E \eTD
     \eTR
     \bTR
         \bTD E \eTD
         \bTD[nc=2,nr=2,strut=no,align={middle,lohi}] {\bTABLE
             \bTR \bTD[nc=2] X \eTD \eTR
             \bTR \bTD Y \eTD \bTD Z \eTD \eTR
         \eTABLE} \eTD
         \bTD H \eTD
     \eTR
     \bTR
         \bTD I \eTD
         \bTD L \eTD
     \eTR
     \bTR
         \bTD M \eTD
         \bTD N \eTD
         \bTD O \eTD
         \bTD P \eTD
     \eTR
\eTABLE

\stoptext

> @both: \setupoverlay[hoffset=...,voffset=...]?
> \setupframed[backgroundhoffset=...,backgroundvoffset=...] (\bTD inherits 
> from \framed)?
> Or maybe a method in MP to set the bounding box of the resulting overlay?

setbounds in combination with leftenlarged, topenlarged etc.

> \setupframed has already a backgroundoffset option, whose value can be:
> 
> - a DIMENSION (an offset that is both horizontal and vertical)
> 
> - a "frame": what does it mean? (I looked into pack-rul.mkiv, with no 
> results)

ConTeXt uses the value from the frameoffset key for backgroundoffset.

\startuseMPgraphic{frameborder}
     draw OverlayBox withcolor blue ;
\stopuseMPgraphic

\defineoverlay[frameborder][\useMPgraphic{frameborder}]

\setupheader[state=high]
\setupfooter[state=high]

\starttext

\setupframed
   [width=4cm,
    height=4cm,
    offset=1cm]

\framed{}

\framed[frame=off,background=frameborder]{}

\framed[frameoffset=-5mm]{}

\framed[frameoffset=-5mm,frame=off,background=frameborder]{}

\framed[backgroundoffset=-5mm,frame=off,background=frameborder]{}

\framed[frameoffset=-5mm,backgroundoffset=frame,frame=off,background=frameborder]{}

\stoptext

Wolfgang
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Re: offset for background overlay

[mf]

>> Or maybe a method in MP to set the bounding box of the resulting overlay?
> 
> setbounds in combination with leftenlarged, topenlarged etc.
> 
Thanks Wolfgang, this is the kind of solution I was looking for:

\startuseMPgraphic{cell:triangle}
   path p ; p := unittriangle rotated 90 xscaled 2.5 OverlayWidth 
yscaled 2.5 OverlayHeight ;
   draw p withcolor red ;
   setbounds currentpicture to p topenlarged 6mm ;
\stopuseMPgraphic
\defineoverlay[triangle][{\uniqueMPgraphic{cell:triangle}}]
\starttext
\bTABLE[frame=off]
   \bTR
     \bTD[nx=2,align=middle,background=triangle] \dontleavehmode a\crlf 
text \eTD
   \eTR
   \bTR[toffset=1mm]
     \bTD left \eTD
     \bTD right \eTD
   \eTR
   \bTR
     \bTD another \eTD
     \bTD row \eTD
   \eTR
\eTABLE
\stoptext

Thanks also for the explanation of backgroundoffset: it's an offset 
relative only to the background, and it moves in the opposite direction 
of the content offset of \framed.

Looks like \framed[...,offset=VALUE,backgroundoffset=frame,...] is 
equivalent to \framed[...,offset=VALUE,backgroundoffset=-VALUE,...].

I tried to add something to the WIKI to show how it works, but the 
previews I got were not consistent with what I'm obtaining on my PC 
(with LMTX and "context --luatex"), so I gave up.

Massi
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Re: offset for background overlay

[Wolfgang Schuster]

mf schrieb am 13.04.2020 um 17:21:

> Thanks also for the explanation of backgroundoffset: it's an offset 
> relative only to the background, and it moves in the opposite direction 
> of the content offset of \framed.
> 
> Looks like \framed[...,offset=VALUE,backgroundoffset=frame,...] is 
> equivalent to \framed[...,offset=VALUE,backgroundoffset=-VALUE,...].
> 
> I tried to add something to the WIKI to show how it works, but the 
> previews I got were not consistent with what I'm obtaining on my PC 
> (with LMTX and "context --luatex"), so I gave up.

When you use "backgroundoffset=frame" you have to change the value for 
"frameoffset" to get a result because "backgroundoffset" uses now the 
"frameoffset" value.

Wolfgang
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