Re: [Pgfplots-features] Controlling the order of legend entries

[Christian F. <cfe...@go...>]

Hello Robert,

legends can be fully customized, but only by means of the \label and 
\ref approach. In other words: you need to build an own tikz matrix 
(perhaps using the same styles) and you need to fill it manually.

An example would be
      \begin{tikzpicture}
        \begin{axis}[
                     extra description/.code={
                     \matrix[/pgfplots/every axis legend]
                     {
                         \ref{2x} \pgfmatrixnextcell \node{$2\cdot x$};\\
                         \ref{x} \pgfmatrixnextcell \node{$x$};\\
                     };
                     }
                    ]
         \addplot {x};
         \label{x}
         \addplot {2*x};
         \label{2x}
        \end{axis}
      \end{tikzpicture}


I admit that it doesn't look perfect - seems something with the vertical 
alignment is not as in the original legend implementation.
Perhaps you find out how to fix the vertical alignment here; I guess the 
tikz manual will be the resource of choice.

The \ref{} command, when found inside of a tikzpicture, will make a 
scope and issue a '\draw....' command corresponding to the graphics. 
Perhaps a variant of \node{\ref{...}}; does the job (did not work when I 
tried it, though).

In short: you may need to customize your legend (semi) manually, which 
is possible.

Best regards

Christian

Am 13.01.2011 09:51, schrieb Robert Read:
> Hello everyone,
>
> As I understand it, the order of the legend entries should generally
> match the order of the plots. I understand that I can reverse this
> order by using the reverse legend=true or legend reversed=true
> commands, but is it possible to control the order of the legend
> entries independently of the order of the plots? Let's say for
> example that the order of my plots is 1, 2, 3, 4, but I want to list
> the corresponding legend entries in the order 3, 1, 4, 2. Is this
> possible?
>
> Any assistance would be very gratefully received.
>
> Best regards,
>
> Robert
>
>
> Robert Read
> Department of Mechanical Engineering
> Technical University of Denmark
> Nils Koppels Allé
> Building 403 Room 009
> DK-2800 Kgs. Lyngby
> Denmark
>
> tel: 0045 4525 1376
> e-mail: rob...@ca...
>
>
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