From: Peter Rolf <indiego@gmx.net>
To: mailing list for ConTeXt users <ntg-context@ntg.nl>
Subject: Re: runtime problem with metafun() code
Date: Mon, 27 Jan 2014 14:17:18 +0100 [thread overview]
Message-ID: <52E65C5E.5050001@gmx.net> (raw)
In-Reply-To: <52E64D11.1060400@wxs.nl>
Am 27.01.2014 13:12, schrieb Hans Hagen:
> On 1/25/2014 1:58 PM, Peter Rolf wrote:
>> Am 25.01.2014 01:07, schrieb Hans Hagen:
>>> On 1/24/2014 7:41 PM, Peter Rolf wrote:
>>>> Am 24.01.2014 14:45, schrieb Hans Hagen:
>>>>> On 1/24/2014 1:35 PM, Peter Rolf wrote:
>>>>>> Hi,
>>>>>>
>>>>>> I try to create a Metapost path in lua and it works so far for the
>>>>>> attached example. But a call of that function from another lua
>>>>>> function
>>>>>> sadly fails (no path visible after call). The code seems to be
>>>>>> executed
>>>>>> later (the output from 'show pid;' appears somewhere later in the
>>>>>> log).
>>>>>>
>>>>>> How can I ensure that the code is executed at runtime?
>>>>>
>>>>> I don't understand the issue but isn't there a
>>>>>
>>>>> metafun("draw p;")
>>>>>
>>>>> missing then?
>>>>>
>>>> Setting the bounding box has the same effect, as drawing something.
>>>> Both methods avoid that the emtpy graphic is ignored by ConTeXt.
>>>>
>>>> Anyhow, the MP path is not available in metapost.variables after the
>>>> function call. If there is no other way I have to call the function
>>>> from
>>>> the TeX side (like in the attached example). Will look into that
>>>> tomorrow.
>>>
>>> %D We also provide an outputless run:
>>>
>>> \unexpanded\def\startMPcalculation
>>>
>> I tried that command, but couldn't get it to work on the lua side.
>>
>> The first pure MP line after context.startMPcalculation() raises a lua
>> error and a combination with metafun() is also not working. So how to
>> use this in lua?
>>
>>
>> Anyhow, the problem is the execution time of the MP graphic. I changed
>> the attached example a bit, so that you can see it.
>> The inspect() in drops.foo() gives an empty table, while the second
>> inspect on the TeX side shows the path "drops:foo".
>>
>> I need the path right after the call (it needs to be adapted to IM
>> afterwards; mainly scaling and shifting). Is there a way to "force" the
>> execution of the graphic without switching back to the TeX side?
>
>
> function drops.foo(id,width,height,radius)
> drops.generate_default_path(id,width,height,radius)
> context(function() inspect(metapost.variables) end) -- empty here
> end
>
> or
>
> function drops.bar()
> inspect(metapost.variables)
> end
>
> function drops.foo(id,width,height,radius)
> drops.generate_default_path(id,width,height,radius)
> context(drops.bar) -- empty here
> end
>
>
Ah, that's how it works. I'm still a luatex noob...
Many thanks, Hans!!
Peter
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prev parent reply other threads:[~2014-01-27 13:17 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-24 12:35 Peter Rolf
2014-01-24 13:45 ` Hans Hagen
2014-01-24 18:41 ` Peter Rolf
2014-01-25 0:07 ` Hans Hagen
2014-01-25 12:58 ` Peter Rolf
2014-01-27 12:12 ` Hans Hagen
2014-01-27 13:17 ` Peter Rolf [this message]
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