Math & Science ⇒ Dipolar bonds with XymTeX

[feynman]

I guess you are the same person who reply at the same request into the italian Latex forum. Thanks again for your help I'm going to learn TikZ and chemfig after exams

Yes, I'm the author of the package, I know it pretty well

So compliments for the great work

[localghost]

It is important to undersatnd that the "@" char puts a global tikz node. After that, everything can be done with TikZ and nodes (ie a lot of things) is possible. […]

I was pretty sure that I missed something. Thanks for pointing that out. I tried to draw the arrow by postaction on a path and using an arrow tip as decoration, but had no success.

So compliments for the great work […]

Now that the problem seems to be solved, please mark the topic accordingly as written in Section 3 of the Board Rules.

[unbonpetit]

I was pretty sure that I missed something. Thanks for pointing that out. I tried to draw the arrow by postaction on a path and using an arrow tip as decoration, but had no success.

Yes, chemmove (which is a \begin{tikzpicture} with appropriate options) enables to see the nodes defined with a "@" inside a previous molecule.

Code: Select all

\documentclass{article}
\usepackage{chemfig}
\begin{document}
\chemfig{@aA-B}
\chemmove{\draw[fill=red](a)circle(2pt);}

\chemfig{@aA-@bB}
\chemmove{\draw[red,thick](a)--([yshift=-4mm]a.center)--(b);}

\chemfig{@aA-@bB-[2]@cC}
\chemmove{\fill[blue](a.center)--(b.center)--(c.center)--cycle;}
\end{document}

[localghost]

That's indeed really nice. Always good to get ideas at first hand. I'm looking forward to further developments of this excellent package.

[unbonpetit]

I'm looking forward to further developments of this excellent package.

Hum... Developments? Right now, it's becoming a headache! I rewrote the code of chemfig in plain-tex in order to make the package compatible with all formats. This work is finished and chemfig works well with documents written in TeX, and of course latex. Unfortunately, I can not compile any document written in context which calls chemfig. I do not understand why... For me, something written and working with plain TeX should also work with conTeXt!

If you have any knowledge about this format, could you help me (via PM)?

[ShinsakuFujita]

Too late comment but ...

If you use XyMTeX under PostScript Mode (latex --> dvips etc.),
please try the following code:

Code: Select all

\documentclass{article}
\usepackage{xymtexps}
\begin{document}
\def\updipolar#1{\psline[unit=0.1pt]{->}(40,100)(40,220)\put(0,240){#1}}
\DtetrahedralS{0==\lonepairA[1]{N};0==\updipolar{H$^+$};2==H;3A==H;4B==H}  
\end{document}

If you use XyMTeX under PDF Mode (latex --> dvipdfmx etc.),
please try the following code:

Code: Select all

\documentclass{article}
\usepackage{xymtexpdf}
\begin{document}
\def\updipolar#1{\tikznodimension{%
\draw[-stealth](40\unitlength,100\unitlength)--%
(40\unitlength,220\unitlength);}\put(0,240){#1}}
\DtetrahedralS{0==\lonepairA[1]{N};0==\updipolar{H$^+$};2==H;3A==H;4B==H}  
\end{document}