Benjamin R. Haskell wrote:
> Hi all,
>
> I recently transitioned from LaTeX to ConTeXt. There was some particular
> thing I needed to do (which escapes me at the moment) that was far, far
> easier to do in ConTeXt than in LaTeX. And, as I've learned, I've found
> that that's quite often the case. So, a huge thank you to everyone
> involved.
>
> A couple hours ago I was annoyed that I couldn't find an equivalent for
> the LaTeX 'cancel' environment/command/style(?)[1]. Now, I'm truly amazed
> that 'cancel' required a whole package.
>
> After discovering that 'underline' and 'strikethrough' were implemented as
> overlays, I quickly coded up the following:
>
> \startuseMPgraphic{MyCancel}
> draw (0,.2*\overlayheight)--(\overlaywidth,\overlayheight);
> \stopuseMPgraphic
> \defineoverlay[mycancel][\useMPgraphic{MyCancel}]
>
> \def\cancel#1{\framed[background=mycancel,frame=off]{#1}}
>
>
> Now, I'm sure this is not *quite* the right way to do it. The 'cancel'ed
> items end up being placed too high on the line, and other spacings are
> slightly off. But, taking a cue from underlining, I kept the MyCancel
> graphic and tried:
>
> \definetextbackground
> [cancel]
> [location=text,
> alternative=1,
> background=mycancel]
> % plus boilerplate for setting up \startcancel\stopcancel
>
> ....But, while composing this email, I found what I wanted, which still
> isn't ``right'' in some sense:
>
> \def\cancel#1{\framed[background=mycancel,frame=off,width=fit,height=fit,strut=no]{#1}}
>
> I found the parameters for \framed. I'm still learning to Read The
> Fantastic Manuals, but sent this anyway since I wanted to say thanks.
\startuseMPgraphic{mpos:par:cancel}
for i=1 upto nofmultipars :
draw
.2[llcorner multipars[i],ulcorner multipars[i]] --
.2[urcorner multipars[i],lrcorner multipars[i]] ;
endfor ;
\stopuseMPgraphic
\definetextbackground[cancel][location=text,mp=mpos:par:cancel]
\def\startcancel{\starttextbackground[cancel]}
\def\stopcancel {\stoptextbackground}
\def\cancel {\groupedcommand\startcancel\stopcancel}
however, this is kind of fuzzy when you cross lines
an alternative is to use:
\definetextbackground[cancel][location=text,alternative=4,background=,frame=off]
\definestartstop
[cancel]
[before={\starttextbackground[cancel]},
after=\stoptextbackground]
however, there is a glitch in the drawing so you need a patch
\startMPinclusions
def draw_multi_pars =
for i=1 upto nofmultipars :
do_draw_par(multipars[i]) ;
if boxgridtype= 1 :
draw baseline_grid (multipars[i],if multilocs[i]=1: down else: up
fi,true) ; % withcolor boxgridcolor ;
elseif boxgridtype= 2 :
draw baseline_grid (multipars[i],if multilocs[i]=1: down else: up
fi,false) ; % withcolor boxgridcolor ;
elseif boxgridtype= 3 :
draw baseline_grid (multipars[i],if multilocs[i]=1: down else: up
fi,true) ; % withcolor boxgridcolor ;
draw baseline_grid (multipars[i],if multilocs[i]=1: down else: up
fi,true) shifted (0,ExHeight) ; % withcolor boxgridcolor ;
elseif boxgridtype= 4 :
draw baseline_grid (multipars[i],if multilocs[i]=1: down else: up
fi,true) shifted (0,ExHeight/2) ; % withcolor boxgridcolor ;
elseif boxgridtype=11 :
draw
graphic_grid(multipars[i],boxgriddistance,boxgriddistance,boxgriddistance/2,boxgriddistance/2)
;
elseif boxgridtype=12 :
draw graphic_grid(multipars[i],boxgriddistance,boxgriddistance,0,0) ;
fi ;
endfor ;
enddef ;
\stopMPinclusions
(will be fixed in the next release)
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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
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