Conditionals within tikz node specification

I would like to specify custom hierarchies of tikz nodes where I do a few geometry calculations related to text depth, text width, text height, and so on.

In the process of writing custom commands to automate some of these calculations, I end up wanting to use TeX conditionals mixed in with tikz code. I read in another question that pgfextra can be used for this. However, it seems that this only works at the level of the tikzpicture environment.

A minimal example of what I would like to do is the following:

documentclass[class=minimal, border=0pt]standalone usepackagetikz newififDebug %Debugtrue Debugfalse newcommandMyNode node[anchor=north west, minimum width=5cm, minimum height=5cm, fill=green, pgfextraifDebug opacity=0.2,fi ] at (current page.north west) begindocument begintikzpicture MyNode; endtikzpicture enddocument

The line containing pgfextra is giving me trouble. What should I do to conditionally change arguments to node?

Thanks!

2 Answers
2

Welcome to TeX.SE! Please try to avoid all pgfextra stuff. You can achieve almost everything with pgfkeys, also here.

pgfextra

documentclass[class=minimal, border=0pt]standalone usepackagetikz newififDebug %Debugtrue Debugfalse tikzsetDebug/.code=ifDebugpgfkeysalsoopacity=0.2fi newcommandMyNode node[anchor=north west, minimum width=5cm, minimum height=5cm, fill=green, Debug, ] at (current page.north west) begindocument begintikzpicture Debugtrue MyNode; endtikzpicture enddocument

enter image description here

If I comment out Debugtrue, I get.

Debugtrue

enter image description here

With a Tikz style (implemented with the /.code handler) this is rather straightforward:

/.code

documentclass[class=minimal, border=0pt]standalone usepackagetikz newififDebug Debugtrue %Debugfalse tikzset my node/.code= tikzset anchor=north west, minimum width=5cm, minimum height=5cm, fill=green, ifDebug tikzsetopacity=0.2 fi begindocument begintikzpicture node[my node]; Debugfalse node[my node] at (6,0); endtikzpicture enddocument

enter image description here

As mentioned by marmot in his answer you should stay away from pgfextra in general. My personal preference is also to stay away from custom commands where styles can do the same, but that really is personal.

pgfextra

style

You were faster, +1. I don't know why someone would upvote only my answer, but not yours. Sad.

– marmot
Sep 10 '18 at 12:29

@marmot Well if someone thinks your solution is cleaner (which I could agree with) then it's a normal reaction :)

– Max
Sep 10 '18 at 12:33

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