Re: Wrong results for chemical structures and reactions

[Marco Patzer <homerow@lavabit.com>]

2012-10-02 Alan BRASLAU <alan.braslau@cea.fr>:

> Try the following:
> 
> \starttext
> 
> \startchemicalformula
>  \chemical{2H_2}
>  \chemical{+}
>  \chemical{O_2}
>  \chemical{->}
>  \chemical{2H_2O}
> \stopchemicalformula

\chemical{->} is not rendered correctly.

> \startchemicalformula
>  \chemical{2H_2}
>  \chemical{PLUS}
>  \chemical{O_2}
>  \chemical{GIVES}
>  \chemical{2H_2O}
> \stopchemicalformula

The spacing is wrong. The following yields to better spacing:

\startchemicalformula
 \chemical{2H_2}
 \chemical{PLUS}
 \chemical{}
 \chemical{O_2}
 \chemical{GIVES}
 \chemical{}
 \chemical{2H_2O}
\stopchemicalformula

> \startchemicalformula
>   \chemical{A}
>   \chemical{GIVES}
>   \chemical{B}
>   \chemical{EQUILIBRIUM}
>   \chemical{C}
>   \chemical{MESOMERIC}
>   \chemical{D}
> \stopchemicalformula

Same spacing problem, workaround: \chemical{}

> \setupchemical
>     [width=fit,
>      height=fit,
>      scale=small,
>      size=small]
> 
> \hbox{
> \startchemical
>     \chemical[ONE,Z0,DB1,SB46,MOV1,Z0,SB28][C,C]
> \stopchemical
> \startchemicalformula
>     \chemical{PLUS}
> \stopchemicalformula
> \startchemical
>     \chemical[ONE,Z0,SB146,Z6][N,H]
> \stopchemical
> \startchemicalformula
>     \chemical{GIVES}
> \stopchemicalformula
> \startchemical
>     \chemical[ONE,Z07,SB1357,MOV1,Z0,SB27,MOV2,Z0,SB13][C,H,C,N]
> \stopchemical
> }

Worse than before.

> 3. I believe that the syntax should be rationalized, but I will have to
> discuss this further with Hans. Normally, commands have keywords
> between [] and text to be typeset between {}. This would mean
> \startchemical
> 	\chemical[ONE,Z0,SB146,Z6]{N}{H}
> \stopchemical
> 
> Alternatively:
> \startchemical
> 	\chemical[ONE,Z0=N,SB146,Z6=H]
> \stopchemical
> but currently this puts "N" and "H" into lowercase as "n" and "h"
> as a side effect of the way that Hans wrote the lua code.

If you redo the syntax: My suggestion would be to try to reduce the
use of the string “chemical” if that's feasible.

> How to deal with inline equations, as in \chemical{2H_2,+,O_2,->,2H_2O}?
> I would think that it could work as does math mode:
> \chemical{2H_2 + O_2 -> 2H_2O} (no commas) with spaces (or none)
> delimiting the keywords.

That looks more practical.

> Hans will have to answer me on this. We need to be a bit patient,

I don't need that now. For the current project all structures look
fine (ugly hacks included :). You may consider my comments above
when you (or Hans) are redoing the code. Thanks for the
\startchemicalformula hint, that was the missing piece.

> as I'm sure that he is currently VERY busy preparing for EuroTeX 2012!

Sure. Unfortunately I cannot come, I can't get a week off and for
1-2 days it's too far.


Marco

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