3. Re: \MPpos, pxy, initialize_box(), oh my! (Hongwen Qiu)

3. Re: \MPpos, pxy, initialize_box(), oh my! (Hongwen Qiu)

[Adam Fuller]

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On 5/06/2010 6:31 a.m., ntg-context-request@ntg.nl wrote:
>     3. Re: \MPpos, pxy, initialize_box(), oh my! (Hongwen Qiu)

hi hongwen,
thanks for taking an interest.

my initial post had a mistake:  i meant to refer to the /Metafun/ manual, not the Metapost manual.  that probably didn't help.

i guess what i should have said is, i know that pxy can give me the bounding /box/ (the rectangle with the maximum horizontal and vertical extents of its contents, be they set in horizontal or vertical mode), but can it give me the subset of that, the bounding /path/, if you will, when the contents are text which flows over several lines.  the bounding /path/ may not be rectangular, although it will be something like the union of the bounding boxes of the text's individual lines.

i think if you look at the correct reference, the difference of the effects is clear.  i think the challenge is that you don't know where the line breaks will occur until you typeset it.   --adam

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Re: 3. Re: \MPpos, pxy, initialize_box(), oh my! (Hongwen Qiu)

[Hongwen Qiu]

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? 2010?06?05? 10:56, Adam Fuller ??:
> my initial post had a mistake:  i meant to refer to the /Metafun/ 
> manual, not the Metapost manual.  that probably didn't help.
Actually, I know that you mean the /Metafun/ manual.
> i guess what i should have said is, i know that pxy can give me the 
> bounding /box/ (the rectangle with the maximum horizontal and vertical 
> extents of its contents, be they set in horizontal or vertical mode), 
> but can it give me the subset of that, the bounding /path/, if you 
> will, when the contents are text which flows over several lines.  the 
> bounding /path/ may not be rectangular, although it will be something 
> like the union of the bounding boxes of the text's individual lines.
So now, I understand what mean.
> i think if you look at the correct reference, the difference of the 
> effects is clear.  i think the challenge is that you don't know where 
> the line breaks will occur until you typeset it.   --adam 
And the source code from the manual may help you:

\setupMPvariables[mpos:box][linecolor=darkred]
\setupMPvariables[mpos:par][linecolor=darkred]

\startpositionoverlay{backgraphics}
   \setMPpositiongraphic{A-3}{mpos:box}{self=A-3}
   \setMPpositiongraphic{A-4}{mpos:box}{self=A-4}
   \setMPpositiongraphic{b:A-5}{mpos:par}{self=A-5}
   \setMPpositiongraphic{b:A-6}{mpos:par}{self=A-6}
\stoppositionoverlay

\fpos {A-5} Because the text must be laid on top of
the graphic, the graphic must precede the first word in the
typeset stream or it must be positioned on a separate layer.
In the latter case it can be calculated directly after the
paragraph is typeset, but in the former case a second pass
is needed. \tpos {A-5}

Given the above code, I think you can get some information about the 
horizontal and vertical pos of texts from \fpos and \tpos. And the 
mpos:par is defined in anch-pgr.mkii and anch-pgr.mkiv. But I haven't 
dig into the code which implement mpos:par. Hope you can find useful 
information there.

And hope the following message I just searched out will help you too:

http://archive.contextgarden.net/message/20080107.024554.314d9fee.ca.html

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Re: Wrong spacing before and after commas in math(?)

[Warrence]

On Fri, 4 Jun 2010, "Aditya Mahajan" wrote:
 > Does
 >
 > \setupmathematics[autopunctuation=no] % or yes
 >
 > give better result? (Are you using MKIV or MKII)?
 >
 > Aditya

\setupmathematics[autopunctuation=no] seems to fix the spaces before the 
x, but "...," is still bit ugly. I'm using MkIV, sorry for not 
mentioning it.


 > the default setup is for coordinates
 >
 > eventually we will have layer that implements settings for specific
 > fields as each demand their own rules (same for symbols)
 >
 > Hans

Do you mean coordinates like "a vector (x,y,z)"? I still think that the 
extra space before "y" and "z" would be appreciated. But nevertheless, 
different settings for different needs sounds like a good idea.

Thank you,
Stefan.
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Re: Wrong spacing before and after commas in math(?)

[Hans Hagen]

On 4-6-2010 8:55, Yury G. Kudryashov wrote:
> Aditya Mahajan wrote:
>
>> On Fri, 4 Jun 2010, "Stefan Müller" wrote:
>>
>>> if I'm typesetting for example $(a,x,\dots,b)$ I see that the space
>>> before the x is too small.
>> Does
>>
>> \setupmathematics[autopunctuation=no] % or yes
>>
>> give better result? (Are you using MKIV or MKII)?
> I had a similar issue with MKIV. autopunctuation=no fixed it for me.

the default setup is for coordinates

eventually we will have layer that implements settings for specific 
fields as each demand their own rules (same for symbols)

Hans

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Re: Wrong spacing before and after commas in math(?)

[Yury G. Kudryashov]

Aditya Mahajan wrote:

> On Fri, 4 Jun 2010, "Stefan Müller" wrote:
> 
>> if I'm typesetting for example $(a,x,\dots,b)$ I see that the space
>> before the x is too small.
> Does
> 
> \setupmathematics[autopunctuation=no] % or yes
> 
> give better result? (Are you using MKIV or MKII)?
I had a similar issue with MKIV. autopunctuation=no fixed it for me.


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Re: Wrong spacing before and after commas in math(?)

[Aditya Mahajan]

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On Fri, 4 Jun 2010, "Stefan Müller" wrote:

> Hi,
>
> if I'm typesetting for example $(a,x,\dots,b)$ I see that the space before the x is too small. It should be bigger than the space after the x. I could work around it by typing $a,\,x,\dots,\,b$ but this is somewhat inconvenient and even a bit too much spacing...
>
> On the other hand, the spacing before \dots is just right, but the spacing after \dots is too small: the spaces between commas and periods ",...," should all be the same.
>
> Is this a bug? Can this be changed by a global option or something? Thanks for any help in advance.

Does

\setupmathematics[autopunctuation=no] % or yes

give better result? (Are you using MKIV or MKII)?

Aditya

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Wrong spacing before and after commas in math(?)

["Stefan Müller"]

Hi,

if I'm typesetting for example $(a,x,\dots,b)$ I see that the space before the x is too small. It should be bigger than the space after the x. I could work around it by typing $a,\,x,\dots,\,b$ but this is somewhat inconvenient and even a bit too much spacing...

On the other hand, the spacing before \dots is just right, but the spacing after \dots is too small: the spaces between commas and periods ",...," should all be the same.

Is this a bug? Can this be changed by a global option or something? Thanks for any help in advance.

Best regards,
Stefan
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