On 8/8/23 20:57, Hans Hagen wrote:
> On 8/8/2023 7:43 PM, Hans Hagen wrote:
>> On 8/8/2023 6:13 PM, Xavier B. wrote:
>>> After some time, I could write a minimal example with tikz with
>>> strange error: Cannot parse this coordinate.
>>>
>>> Can someone help me to find the bug?
>>>
>>> I attach the file and the log.
>>>
>>> Help very appreciate
>>> I run
>> \starttikzpicture
>> \foreach \p in {(6,2)}
>> {
>> \tracingall
>> \startscope[shift={\p}]
>> \draw[color=green!60, thick] (0,0) -- (1,1);
>> \stopscope
>> }
>> \stoptikzpicture
>>
>> looks like some parsing issue, are you sure that you can assign \p to
>> shift this way?
> ok, i found it but i'm not going to make it custom to fix tikz
>
> you need to use this:
>
> \normalexpanded{\noexpand\startscope[shift={\p}]}
>
> instead of
>
> \startscope[shift={\p}]
>
> this can be automated with (maybe we need a m-fixz module for that)
>
> % fix
>
> \appendtoks
> \let\normaltikzstartscope\startscope
> \def\startscope[#1]%
> {\normalexpanded
> {\noexpand\normaltikzstartscope[#1]}}%
> \to \everyinsidetikzpicture
>
> % end of fix
>
> but for that you need to use the attached module so that we hook it in
> aftert tikz sets itself up
>
> the fix you can put in your style or in a cont-loc.mkxl in a local tree
This is likely going to break all kinds of stuff, because not everything
in \startscope[...] can always be expanded. Also the brackets are
optional in the original definition of \startscope, so a \dosingleempty
would at least be in order:
\appendtoks
\let\normaltikzstartscope\startscope
\def\dostartscope[#1]%
{\normalexpanded
{\noexpand\normaltikzstartscope[#1]}}%
\def\startscope{\dosingleempty\dostartscope}%
\to \everyinsidetikzpicture
In fact, pgfkeys has a handler for expanding keys before doing
assignment to work around exactly these situations:
\startscope[shift/.expanded={\p}]
No redefinition needed.
We could also do \edef or \romannumeral expansion in the shift key in
TikZ, but I'm not sure whether that would break someone's code.
Cheers,
Henri
>
> Hans
>
> -----------------------------------------------------------------
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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