Gdtyjr

I'm trying to align the signature with the destination address in a french styled letter.

I could use the very good lettre class as mentioned in my previous question but I need to scrtllr2 to reuse the org-mode koma export back-end.

I tried setting the position with the following commands:

Test 0

makeatletter
@setplengthsigindent-useplengthrefhpos+useplengthtoaddrhpos}
makeatother

Test 1

setkomavarsignatureChef Abraracoursix,\Un chef à toujours bras long.

Test 2

setkomavarsignaturehspace26emincludegraphics[width=2.5cm]
example-image

Test 3

setkomavarsignaturehspace26em
 beginminipage[t]7cm
 Chef Abraracoursix,hfill \Un chef à toujours bras long.
 endminipage

But the signature is stuck to the left.
Here is my full code and the result I'm looking for.

% Created 2019-04-08 lun. 11:20
% Intended LaTeX compiler: pdflatex
documentclassscrlttr2
usepackage[francais]babel
usepackage[utf8]inputenc
usepackagehyperref
% usepackageshowframe % to show the page boundaries from https://tex.stackexchange.com/questions/298246/signatures-side-by-side

% usepackagegeometry 
% geometryverbose,a4paper,lmargin=3cm,rmargin=3cm

LoadLetterOptionvisualize
showfieldshead,foot,address,location,refline
LoadLetterOptionNF
renewcaptionnamefrenchsubjectnameObjet
renewcaptionnamefrenchccnameC.c.

KOMAoption
 ,foldmarks=false
 ,refline=nodate
 ,subject=titled
 ,fromemail=false
 ,fromlogo=false
 ,fromphone=false
 ,fromurl=false
 ,backaddress=false
 ,foldmarks=false



% from name
setkomavarfromnameChef Abraracoursix
setkomafontfromnamescshape

%%%%%%%%%%%%%%%% HERE %%%%%%%%%%%%%%%%
% signature

%%%% test 1
% setkomavarsignatureChef Abraracoursix,\Un chef à toujours bras long.

%%%% test 2
% setkomavarsignaturehspace26emincludegraphics[width=2.5cm]example-image% <- changed

%%%% test 3
% setkomavarsignaturehspace26em
% beginminipage[t]7cm
% Chef Abraracoursix,hfill \Un chef à toujours bras long.
% endminipage

%%%% test 4
setkomavarsignature
 noindent parbox[t]0.5linewidthChef Abraracoursix,hfill \Un chef à toujours bras long.
 

%%%%%%%%%%%%%%%% above %%%%%%%%%%%%%%%%


% from adress
setkomavarfromaddressPlace du village,\Erqy,\Armorique
setkomafontfromaddresssmall

% place and location
setkomavarplaceErqy
setkomavarplaceseparator, le 

% other komavar
setkomavarccseparator
setkomavar*ccseparatorllapccnamequad
% usepackagesetspace usepackagelipsum setstretch1.15

% setlengthparskipmedskipamount 
% setlengthparindent0pt
% setstretch1.15

datetoday

makeatletter
% firsthead
setkomavarfirsthead
 usekomafontfromaddress
 parbox[b]useplengthfirstheadwidth
 usekomafontfromnameusekomavarfromname
 hfillusekomafontplaceanddate
 ifkomavaremptyplaceusekomavarplaceusekomavarplaceseparator
 usekomavardate
 
 \usekomavarfromaddress
 medskip
 if@phone\usekomavar*fromphoneusekomavarfromphonefi
 if@mobilephone\usekomavar*frommobilephoneusekomavarfrommobilephonefi
 if@fax\usekomavar*fromfaxusekomavarfromfaxfi
 if@email\usekomavar*fromemailusekomavarfromemailfi
 if@www\usekomavar*fromurlusekomavarfromurlfi
 


makeatletter
%%%% TEST 0
% @setplengthsigindent-useplengthrefhpos+useplengthtoaddrhpos}
makeatother
renewcommand*raggedsignatureraggedright


hypersetup
 pdfauthor=Chef Abraracoursix,
 pdftitle=Invitation pour une banquet au sanglier Roti,
 pdfcreator=Emacs 26.1 (Org mode 9.1.9), 
 pdflang=French

begindocument

setkomavarsubjectInvitation pour une banquet au sanglier Roti

beginletter
 Capitaine Paulus Romanicus\
 Camp de Babaorum
 Bretany

 openingLe Romain,

 Dans le cadre des rapports de bon voisinage et de notre hospitalité légendaire, nous vous invitons à festoyer avec nous sous le grand chêne, du coucher du soleil à l'aube, à la prochaine plein lune pour le mariage de la belle Fabala et de vigourix.
 closingÀ la tienne !

endletter

enddocument

Idealy I would like

makeatletter
@setplengthsigindent-useplengthrefhpos+useplengthtoaddrhpos}
makeatother

to work as expected with pseudo-lenght given in https://i.stack.imgur.com/D2tu3.png

You calculation -useplengthrefhpos+useplengthtoaddhpos does not result in a value, that moves the signature to the middle of the text area.

In your example the value of refhpos is 0pt and the value of toaddrhpos is -10mm (given by NF.lco). Your

@setplengthsigindent-useplengthrefhpos+useplengthtoaddrhpos

(I've remove one }, which was to much), would result in an sigindent of -10mm. I do not think, that you want this value.

Please have a look into part II of the KOMA-Script manual to see, how the values of toaddhpos and refhpos are interpreted by scrlttr2.

You may try something like:

setplengthsigindent.5textwidth

Or a more complicate calculation:

setplengthsigindentpaperwidth+useplengthtoaddrhpos-useplengthtoaddrwidth+useplengthtoaddrindent-oddsidemargin-1in

Note: This does only work for toaddrhpos < 0.

BTW: sigintend is relative to the left edge of the text area. toaddrhpos and refhpos are relative to one of the paper edges.

Note: Since KOMA-Script 3.26 setplength instead of @setplength is recommended. @setplength is an internal command now. You should not longer use it.

There are several other issues with your code:

usepackage[francais]babel

is deprecated. Current babel warns:

Package francais.ldf Warning: Option `francais' for Babel is *deprecated*,
(francais.ldf) it might be removed sooner or later. Please
(francais.ldf) use `french' instead; reported on input line 31.

KOMAoption
 ,foldmarks=false
 ,refline=nodate
 ,subject=titled
 ,fromemail=false
 ,fromlogo=false
 ,fromphone=false
 ,fromurl=false
 ,backaddress=false
 ,foldmarks=false

is wrong. KOMAoption has two arguments. The first one is an option key, the second is a list of option values.

To help users to find out what's wrong, the current prerelease of KOMA-Script shows the following error message with your wrong usage of KOMAoption:

./test.tex:28: Package scrbase Error: syntax error in key ` ,foldmarks=false ,r
efline=nodate ,subject=titled ,fromemail=false ,fromlogo=false ,fromphone=false
 ,fromurl=false ,backaddress=false ,foldmarks=false '.

See the scrbase package documentation for explanation.
Type H <return> for immediate help.
 ... 

l.28 }

You've used `...Option' to set the key ` ,foldmarks=false ,refline=nodate ,sub
ject=titled ,fromemail=false ,fromlogo=false ,fromphone=false ,fromurl=false ,b
ackaddress=false ,foldmarks=false '
to new value(s), but `,' is not allowed in the key of an option
(and `...Option' does not use `,' to separate several keys).
Maybe you've meant ...Options instead of ...Option.
If you'll continue, I'll give it a try, but you should expect further
and even strange error messages.

As the help text of the error message explains:

KOMAoptions
 ,foldmarks=false
 ,refline=nodate
 ,subject=titled
 ,fromemail=false
 ,fromlogo=false
 ,fromphone=false
 ,fromurl=false
 ,backaddress=false
 ,foldmarks=false

would be correct.

Your definition of firsthead adds several significant but unwanted white spaces. See What is the use of percent signs (%) at the end of lines? for more information how to avoid them.

Last but not least, you have a

makeatletter

instead of

makeatletter

in your document preamble.

The problem here is that pseudolength toaddrhpos is set in NF.lco to a negative value of -10mm with command @setplengthtoaddrhpos-10mm.

That means that the value of 10mm is not the value between left paper side and address field, it is the value between the right paper side and the adress box. Usually the adress box is printed first (on the left side of the paper) and the location box follows then. With file NF-lco that changed as you already showed in your picture in your question.

sigindent is always calculated from the left side of the typing area, so you have to calculate the needed value for sigindent by yourself.

One possibility is:

setplengthsigindentpaperwidth+useplengthtoaddrhpos-useplengthtoaddrwidth-useplengthtoaddrindent-useplengthtoaddrindent-useplengthrefhpos

That means we calculate the paperwidth minus toaddrhpos (because its value is already minus we have to use plus here) minus toaddrwidth minus refhpos minus two times toaddrindent.

With that calculation in your corrected given code

documentclass[%
 paper=a4,
 fontsize=11pt,
 french,
]scrlttr2

usepackagebabel
usepackage[T1]fontenc 
usepackage[utf8]inputenc
usepackagehyperref


%LoadLetterOptionvisualize
%showfieldshead,foot,address,location,refline
LoadLetterOptionNF
renewcaptionnamefrenchsubjectnameObjet
renewcaptionnamefrenchccnameC.c.

KOMAoptions
 ,foldmarks=false
 ,refline=nodate
 ,subject=titled
 ,fromemail=false
 ,fromlogo=false
 ,fromphone=false
 ,fromurl=false
 ,backaddress=false
 ,foldmarks=false


% from name
setkomavarfromnameChef Abraracoursix
setkomafontfromnamescshape

setkomavarsignaturenoindent Chef Abraracoursix,\Un chef à toujours bras long.
setplengthsigindentpaperwidth+useplengthtoaddrhpos-useplengthtoaddrwidth-useplengthtoaddrindent-useplengthtoaddrindent-useplengthrefhpos % <===============

% from adress
setkomavarfromaddressPlace du village,\Erqy,\Armorique
setkomafontfromaddresssmall

% place and location
setkomavarplaceErqy
setkomavarplaceseparator, le 

% other komavar
setkomavarccseparator
setkomavar*ccseparatorllapccnamequad

datetoday


% firsthead
setkomavarfirsthead%
 usekomafontfromaddress%
 parbox[b]useplengthfirstheadwidth%
 usekomafontfromnameusekomavarfromname%
 hfill%
 usekomafontplaceanddate%
 ifkomavaremptyplaceusekomavarplaceusekomavarplaceseparator
 usekomavardate
 %
 \usekomavarfromaddress%
 medskip
 if@phone\usekomavar*fromphoneusekomavarfromphonefi%
 if@mobilephone\usekomavar*frommobilephoneusekomavarfrommobilephonefi%
 if@fax\usekomavar*fromfaxusekomavarfromfaxfi%
 if@email\usekomavar*fromemailusekomavarfromemailfi%
 if@www\usekomavar*fromurlusekomavarfromurlfi%
 %


renewcommand*raggedsignatureraggedright

hypersetup%
 pdfauthor=Chef Abraracoursix,
 pdftitle=Invitation pour une banquet au sanglier Roti,
 pdfcreator=Emacs 26.1 (Org mode 9.1.9), 
 pdflang=French



begindocument

setkomavarsubjectInvitation pour une banquet au sanglier Roti

beginletter%
 Capitaine Paulus Romanicus\
 Camp de Babaorum
 Bretany

openingLe Romain,

Dans le cadre des rapports de bon voisinage et de notre hospitalité 
légendaire, nous vous invitons à festoyer avec nous sous le grand chêne, 
du coucher du soleil à l'aube, à la prochaine plein lune pour le mariage 
de la belle Fabala et de vigourix.
closingÀ la tienne !

endletter

enddocument

you get the following result:

It seems there is a difference of 5pt too much I do not know where it comes from (rounding errors, an indent I did not saw?). In the case of this mwe you can add them to the calculation with:

setplengthsigindentpaperwidth+useplengthtoaddrhpos-useplengthtoaddrwidth-useplengthtoaddrindent-useplengthtoaddrindent-useplengthrefhpos-5pt