Equivalent of LaTeX \cancel? and Thanks!

Equivalent of LaTeX \cancel? and Thanks!

[Benjamin R. Haskell]

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.

Best,
Ben

[1] e.g. http://www.sosmath.com/CBB/viewtopic.php?t=9412
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Re: Equivalent of LaTeX \cancel? and Thanks!

[Hans Hagen]

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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               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Equivalent of LaTeX \cancel? and Thanks!

[Wolfgang Schuster]

On Sun, Oct 12, 2008 at 4:17 PM, Hans Hagen <pragma@wxs.nl> wrote:
> 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]

\definestartstop is not neccessary because \definetextbackground defines
\start/\stopcancel and \cancel as shortcuts ;-)

> 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)

Wolfgang
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________