Text Formatting ⇒ Longer Embedded Solutions

[LaTexLearner]

Code: Select all

\node[\PrintSolutionsTF{answercolor}{opacity=0}] at (3,-0.8) {6};

Funny: that is exactly what I tried first when writing my last answer. I am not sure why this doesn't work but my guess is that it is due to how TikZ/pgf reads the argument to \node. It obviously expands \PrintSolutionsTF but very likely after reading the options when it is too late. It doesn't see an option opacity with value 0 but sees an option opacity=0 (thinking the = and 0 were part of the option name). Such an option obviously isn't defined which explains the error. This is the reason why I put \PrintSolutionsTF outside of the path...

There is no standard way to tell TikZ/pgf to read those things as commands? Some use of brackets maybe?

[cgnieder]

I had an idea last night: you could define a new TikZ option:

Code: Select all

\pgfkeys{
  /tikz/.cd ,
    ifanswer/.code 2 args =
    \PrintSolutionsTF{\pgfkeysalso{#1}}{\pgfkeysalso{#2}}
}

and then use it like this:

Code: Select all

\node[ifanswer={answercolor}{opacity=0}] at (2,-0.8) {4};

Regards

[LaTexLearner]

I had an idea last night: you could define a new TikZ option:

Code: Select all

\pgfkeys{
  /tikz/.cd ,
    ifanswer/.code 2 args =
    \PrintSolutionsTF{\pgfkeysalso{#1}}{\pgfkeysalso{#2}}
}

and then use it like this:

Code: Select all

\node[ifanswer={answercolor}{opacity=0}] at (2,-0.8) {4};

Regards

Awesome! That worked perfectly!

Where might I learn about all these new types of commands: \pgfkeys, .cd, ifanswer, etc.?

[cgnieder]

Where might I learn about all these new types of commands: \pgfkeys, .cd, ifanswer, etc.?

The ifanswer key is defined by the above code. The others are explained in the pgfmanual.

[Stefan Kottwitz]

In my opinion, such things as /.code and commands beginning with \pgf are advanced commands, coming from the backend below TikZ, so I would not worry too much about them at the beginning. A lot of other TikZ things are easier but it's great to know such code for extending styles and customizing features.

Stefan