parallel arrows: what about "raise"?

[koslowj]

Not sure, what the current status of drawing parallel arrows is (I've seen solutions using xshift which become cumbersome once I want to shift perpendicular to the direction of an arbitrary arrow), but today found another construction in the manual that looks promising: the description of  /pgf/decoration/mirror= <boolean> on page 243 of my version of the manual contains an example, where a decorating brace is shifted by 5pt perpendicular to the connecting line from A to B via

\draw[decorate,decoration={brace,mirror,raise=5pt} (a) -- (b);

If this is feasible for decorated paths, what about undecorated ones, i.e., just plain arrows or lines?  Or do we need to dress these up as decorations?

-- Jürgen

[Mark Wibrow-2]

Hi,

The lineto decorations cannot be used for such things as they use
special points like \pgfpointdecoratedinputsegmentlast and
\pgfpointdecoratedpathlast  which ``survive'' any transformations
specified by the mirror and raise keys. This has many advantages, but
not in this case.

Fortunately it is possible to define a very simple decoration which
replaces the entire path with a single straight line and observes any
transformations. Everything can then be tied up in a style:

\usepackage{tikz}
\usetikzlibrary{decorations}

\begin{document}

\pgfdeclaredecoration{single line}{initial}{
        \state{initial}[width=\pgfdecoratedpathlength-1sp]{\pgfpathmoveto{\pgfpointorigin}}
        \state{final}{\pgfpathlineto{\pgfpointorigin}}
}

\tikzset{
        raise line/.style={
                decoration={single line, raise=#1}, decorate
        }
}
               
\begin{tikzpicture}
        \draw [red, very thick] (0,0) -- (3,2);
        \foreach \r in {-20,-15,...,20}
                \draw [raise line=\r, ->] (0,0) -- (3,2);
\end{tikzpicture}

\end{document}


Hope this helps,

Mark



2009/9/28 koslowj <koslowj@...>:

>
> Not sure, what the current status of drawing parallel arrows is (I've seen
> solutions using xshift which become cumbersome once I want to shift
> perpendicular to the direction of an arbitrary arrow), but today found
> another construction in the manual that looks promising: the description of
> /pgf/decoration/mirror= <boolean> on page 243 of my version of the manual
> contains an example, where a decorating brace is shifted by 5pt
> perpendicular to the connecting line from A to B via
>
> \draw[decorate,decoration={brace,mirror,raise=5pt} (a) -- (b);
>
> If this is feasible for decorated paths, what about undecorated ones, i.e.,
> just plain arrows or lines?  Or do we need to dress these up as decorations?
>
> -- Jürgen
> --
> View this message in context: http://www.nabble.com/parallel-arrows%3A-what-about-%22raise%22--tp25653217p25653217.html
> Sent from the pgf-users mailing list archive at Nabble.com.
>
>
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