adding an icon (flushed left) in a displayed formula with equation number

adding an icon (flushed left) in a displayed formula with equation number

[David Arnold]

All,

We have:

\placeformula[eq:commonb]
\startformula
   (1)^2+(\sqrt{4x+13})^2=(2x)^2,
\stopformula


This gives us a centered equation with an number pushed to the right  
edge of the page (I probably should say text area).

What we'd like to do, just in this one example (not globally), is add  
a little "smiley face" icon on the same line as the displayed  
equation and equation number, but pushed to the left edge of the page  
(I probably should say text area).

Possible?

Re: adding an icon (flushed left) in a displayed formula with equation number

[Taco Hoekwater]

David Arnold wrote:
> All,
> 
> We have:
> 
> \placeformula[eq:commonb]
> \startformula
>    (1)^2+(\sqrt{4x+13})^2=(2x)^2,
> \stopformula
> 
> 
> This gives us a centered equation with an number pushed to the right  
> edge of the page (I probably should say text area).
> 
> What we'd like to do, just in this one example (not globally), is add  
> a little "smiley face" icon on the same line as the displayed  
> equation and equation number, but pushed to the left edge of the page  
> (I probably should say text area).
> 
> Possible?

It should be possible to do this using a special version of \startalign,
but I cannot figure it out. Maybe Aditya can help?

Taco

Re: adding an icon (flushed left) in a displayed formula with equation number

[Aditya Mahajan]

On Mon, 7 Aug 2006, Taco Hoekwater wrote:
>
> David Arnold wrote:
>> All,
>>
>> We have:
>>
>> \placeformula[eq:commonb]
>> \startformula
>>    (1)^2+(\sqrt{4x+13})^2=(2x)^2,
>> \stopformula
>>
>>
>> This gives us a centered equation with an number pushed to the right
>> edge of the page (I probably should say text area).
>>
>> What we'd like to do, just in this one example (not globally), is add
>> a little "smiley face" icon on the same line as the displayed
>> equation and equation number, but pushed to the left edge of the page
>> (I probably should say text area).
>>
>> Possible?
>
> It should be possible to do this using a special version of \startalign,
> but I cannot figure it out. Maybe Aditya can help?

Here is one solution. Explaination inline.

% I do not know what you want for a smiley, so I use square instead
\def\smiley{\square}

\starttext

This is the basic idea. Have an alignment structure with three blocks, 
each block of 1 column, put the simley in the first block, the 
equation in the second block, and keep the third block empty. The 
trick here is to have {\em 1 fil} in the distance.

\definemathalignment[dosmiley]
                     [n=1,m=3,distance=3em plus 1 fil]


\placeformula[+] \startformula \startdosmiley
   \NC \smiley \NC (1)^2 + (\sqrt{4x+13})^2 = (2x)^2 \NC  \NR[+]
\stopdosmiley \stopformula

Ah, it works. So we can add some syntax sugar around this, so that the 
formula is easier to key in.

\def\startsmileyformula%
     {\startformula \startdosmiley
       \NC \smiley \NC}

\def\stopsmileyformula%
     {\NC \NR[+]
      \stopdosmiley \stopformula}

\placeformula[+] \startsmileyformula
   (1)^2 + (\sqrt{4x+13})^2 = (2x)^2
\stopsmileyformula


If you only want a smiley without the equation, it also works.
:-)

\startsmileyformula
   (1)^2 + (\sqrt{4x+13})^2 = (2x)^2
\stopsmileyformula

\stoptext

Can you send me how you make a smiley. I will then put the code in 
myway on alignment.

Aditya