Graphics, Figures & Tables ⇒ tikz - change default measuring units (from cm to em) ?

[mike-klemin]

Hello!
Probably the subject a little bit miss informative. But not sure how to formulate it better..


Actually I stuck at point where I have to draw a path which coordinates use sqrt(Xem) like

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\draw (0,0) -- ({sqrt(2)},1);

It works, but I need to calculate square root from 2em and not from 2cm as it calculates by default. I tried to add "em" everywhere it would make a sense, but it just didn't worked...

I just can not figure how to do that?
Yes, I can just use calculator and make it

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\draw (0,0) -- (1.414em,1);

But it's just too rude...

[CDbile]

You can instead change the default length of the axis :

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\draw[x=1em,y=1em] (0,0) -- ({sqrt(2)},1);

If you want to use this length in your whole picture, you can just put the option after the \begin{tikzpicture} :

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\documentclass{minimal}
\usepackage{tikz}

\begin{document}
\begin{tikzpicture}[x=1em,y=1em]

\draw (0,0) -- ({sqrt(2)},1);

\end{tikzpicture}
\end{document}

[localghost]

A global setting is also possible.

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\documentclass{minimal}
\usepackage{tikz}

\tikzset{x=1em,y=1em}

\begin{document}
  \begin{tikzpicture}
    \draw (0,0) -- ({sqrt(2)},1);
  \end{tikzpicture}
\end{document}

Thorsten