From: Geert Verhaag <verhaaggchm@ziggo.nl>
To: Hans Hagen <j.hagen@xs4all.nl>,
mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: Struggling with startuseMPgraphic and string argument!
Date: Fri, 18 Sep 2020 13:48:01 +0200 [thread overview]
Message-ID: <4d23bca6-6357-55df-d3dd-be337ee5f87c@ziggo.nl> (raw)
In-Reply-To: <106359b9-955b-429f-0170-2f1489577449@xs4all.nl>
On 18-09-2020 09:03, Hans Hagen wrote:
> On 9/17/2020 9:41 PM, Geert Verhaag wrote:
>> Hi ConTeXt users,
>>
>> That's indeed magic and it works! Hans, thanks for your prompt answer!
>>
>> But I would like to take this a step further, by introducing a macro
>> within the start/stopuseMPgraphic structure like so:
>>
>> \startuseMPgraphic{name}{s::lbl}
>> def mymacro (text lb) =
>> pair a ; a := (3cm,3cm) ;label.top("String: " & str lb,a) ;
>> enddef ;
>> mymacro(\MPvariable{lbl}) ;
>> \stopuseMPgraphic
>>
>> and this works too, but what if I introduce another text argument like:
>>
>> \startuseMPgraphic{name}{s::lbl,s::label}
>> def mymacro (text lb,lbx) =
>> pair a ; a := (3cm,3cm) ;label.top("String: " & str lb & ", " &
>> str lbx,a) ;
>> enddef ;
>> mymacro(\MPvariable{lbl},\MPvariable{label}) ;
>> \stopuseMPgraphic
>>
>> However this doesn't work! It gives the following error:
>>
>> ! Missing argument to mymacro.
>>
>> Isn't that weird? But perhaps it has to do with me not understanding
>> argument passing properly within METAPOST macros!
>>
>> Can someone please explain why this 2 argument example doesn't work?
>>
>> (But maybe this isn't the proper list to ask questions like these. If
>> so, I'm sorry for bothering you!)
>>
>> Regards,
>> Gerard
>>
>>
>> On 16-09-2020 16:32, Geert Verhaag wrote:
>>>
>>> Hi,
>>>
>>> I'm trying to pass a string argument value to an MPgraphic but it
>>> doesn't seem to work:
>>>
>>> Tried the following:
>>>
>>> \startuseMPgraphic{name}{lbl}
>>> pair a ; a := (3cm,3cm) ;label.top("\MPvariable{lbl}",a) ;
>>> \stopuseMPgraphic
>>>
>>> \starttext
>>> \useMPgraphic{name}{lbl=1}
>>> \stoptext
>>>
>>> The above works as expected!
>>>
>>> But the following doesn't:
>>>
>>> \startuseMPgraphic{name}{lbl}
>>> pair a ; a := (3cm,3cm) ;label.top("\MPvariable{lbl}",a) ;
>>> \stopuseMPgraphic
>>>
>>> \starttext
>>> \useMPgraphic{name}{lbl=abc}
>>> \stoptext
>>>
>>> It yields:
>>>
>>> 1 \startuseMPgraphic{name}{lbl}
>>> 2 pair a ; a := (3cm,3cm) ;label.top("\MPvariable{lbl}",a) ;
>>> 3 \stopuseMPgraphic
>>> 4
>>> 5 %\startuseMPgraphic{name}fill fullcircle scaled 200pt
>>> withcolor .625yellow ;\stopuseMPgraphic
>>> 6
>>> 7 \starttext
>>> 8 Example:
>>> 9 >> \useMPgraphic{name}{lbl=abc}
>>> 10 \stoptext
>>> 11
>>>
>>> <to be read again>
>>> a
>>> \m_meta_current_variable a-a
>>> bc
>>> <argument> ... \hbox {\scratchdimen \m_meta_current_variable
>>> sp}\ifzeropt \wd
>>> \b_meta_v...
>>> \secondoftwoarguments #1#2b-#2
>>>
>>> \9>>1 #1,2-\meta_prepare_instance_variable {#1}
>>> \syst_helpers_do_process_comm...
>>> \syst_helpers_do_process_comma_list ...rgument #1,
>>> ]\relax \global
>>> \advance \...
>>> ...
>>> l.9 \useMPgraphic{name}{lbl=abc}
>>>
>>> So it seems that only numbers can be passed not character strings!
>>> Why is that? Is there a possibility to achieve this functionality?
> \startuseMPgraphic{name}{s::lbl,s::label}
> def mymacro(expr a, b) =
> label.top("str:(" & a & "," & b & ")",(3cm,3cm)) ;
> enddef ;
> mymacro("\MPvariable{lbl}","\MPvariable{label}")
> \stopuseMPgraphic
>
> \starttext
> \useMPgraphic{name}{lbl=abc,label=pqr}
> \useMPgraphic{name}{lbl=def,label=xyz}
> \stoptext
>
> -----------------------------------------------------------------
> Hans Hagen | PRAGMA ADE
> Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
> tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
Hi Hans,
It really is in the details!!!
I was convinced that I did something wrong somewhere, but couldn't
figure out what.
Thanks very much for your kind help!
Regards,
Gerard
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prev parent reply other threads:[~2020-09-18 11:48 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-16 14:32 Geert Verhaag
2020-09-17 8:01 ` Hans Hagen
2020-09-17 19:41 ` Geert Verhaag
2020-09-18 7:03 ` Hans Hagen
2020-09-18 11:48 ` Geert Verhaag [this message]
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