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I want to draw different kinds of graphs which I want to define using styles. One particular graph has labelled nodes, and I want to be able to attach these labels using a custom key (cn).

The following document demonstrates this, the problem is, that the node labels specified using cn do not show up.

\documentclass{standalone} \usepackage{tikz} \tikzstyle{RegionGraph}=[ every node/.style={fill=blue!20}, every edge/.style={draw,latex-}, cn/.style={label={#1}} ] \begin{document} \begin{tikzpicture}[RegionGraph] \draw (0,0) node[cn=1] (lr1) {$X_1$} ++(2,0) node[cn=0] (lr2) {$X_2$} edge (lr1); \end{tikzpicture} \end{document}

Where as, when I add the definition of the cn-style directly to the picture, like in the following code, the labels do show.

\begin{tikzpicture}[RegionGraph,cn/.style={label={#1}}] ...

What am I doing wrong and how can it be fixed?

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2 Answers 2

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When you nest the style definitions you need to double the number of # characters as when they get expanded they halve the numbers. So if you nest it in three levels it needs ####1 with four levels eight times etc. That's why labels don't appear because #1 holds the argument for RegionGraph but you meant cn's own argument at the time when it is defined.

\documentclass[tikz]{standalone} \tikzset{RegionGraph/.style={ every node/.style={fill=blue!20}, every edge/.style={draw,latex-}, cn/.style={label={##1}} }} \begin{document} \begin{tikzpicture}[RegionGraph] \draw (0,0) node[cn=1] (lr1) {$X_1$} ++(2,0) node[cn=0] (lr2) {$X_2$} edge (lr1); \end{tikzpicture} \end{document}
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  • This works, and also explains the problem. Thank you. Commented Jan 29, 2015 at 13:47
  • @ziggystar My pleasure Commented Jan 29, 2015 at 13:48
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Use tikzset instead of tikzstyle:

\documentclass{standalone} \usepackage{tikz} \tikzset{ every node/.style={fill=blue!20}, every edge/.style={draw,latex-}, cn/.style={label={#1}}} \begin{document} \begin{tikzpicture} \draw (0,0) node[cn=1] (lr1) {$X_1$} ++(2,0) node[cn=0] (lr2) {$X_2$} edge (lr1); \end{tikzpicture} \end{document}

enter image description here

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  • But now every picture has these styles applied. I want the style to be only valid in pictures with style RegionGraph. Commented Jan 29, 2015 at 11:05
  • Use tikzset definition in only desired tikzpicture. Commented Jan 29, 2015 at 11:12
  • But then I have to define it each time anew. Basically I want that adding RegionGraph to a picture enables the use of cn on the nodes of the picture. But maybe I have to settle with enabling cn globally for all nodes. Commented Jan 29, 2015 at 11:17

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