* Scale image in MetaPost, maintaining aspect ratio
@ 2018-07-07 18:58 Marco Patzer
2018-07-07 20:27 ` Alan Braslau
2018-07-07 20:27 ` Hans Hagen
0 siblings, 2 replies; 9+ messages in thread
From: Marco Patzer @ 2018-07-07 18:58 UTC (permalink / raw)
To: mailing list for ConTeXt users
Hi!
How to scale an image in MetaPost, maintaining the aspect ratio
(without specifying the height explicitly)?
Example:
\setupexternalfigures [location=default]
\starttext
\externalfigure [cow][width=5cm]
\startMPcode
draw externalfigure "cow" scaled 5cm;
\stopMPcode
\stoptext
Marco
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* Re: Scale image in MetaPost, maintaining aspect ratio
2018-07-07 18:58 Scale image in MetaPost, maintaining aspect ratio Marco Patzer
@ 2018-07-07 20:27 ` Alan Braslau
2018-07-07 23:45 ` Marco Patzer
2018-07-07 20:27 ` Hans Hagen
1 sibling, 1 reply; 9+ messages in thread
From: Alan Braslau @ 2018-07-07 20:27 UTC (permalink / raw)
To: Marco Patzer; +Cc: mailing list for ConTeXt users
On Sat, 7 Jul 2018 20:58:40 +0200
Marco Patzer <lists@homerow.info> wrote:
> Hi!
>
> How to scale an image in MetaPost, maintaining the aspect ratio
> (without specifying the height explicitly)?
>
> Example:
>
> \setupexternalfigures [location=default]
> \starttext
> \externalfigure [cow][width=5cm]
>
> \startMPcode
> draw externalfigure "cow" scaled 5cm;
> \stopMPcode
> \stoptext
For "historic" reasons,
draw externalfigure "cow" scaled 5cm ;
normalizes the figure to a square. This will not be changed as it is a
very old feature of MetaFun.
The solution is
draw rawtextext("\externalfigure[cow]") xsized 5cm ;
where one can use xsized, ysized or xysized (taking a pair).
Alan
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^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Scale image in MetaPost, maintaining aspect ratio
2018-07-07 20:27 ` Alan Braslau
@ 2018-07-07 23:45 ` Marco Patzer
2018-07-08 8:39 ` Hans Hagen
0 siblings, 1 reply; 9+ messages in thread
From: Marco Patzer @ 2018-07-07 23:45 UTC (permalink / raw)
To: ntg-context
On Sat, 7 Jul 2018 14:27:38 -0600
Alan Braslau <braslau.list@comcast.net> wrote:
> For "historic" reasons,
> draw externalfigure "cow" scaled 5cm ;
> normalizes the figure to a square. This will not be changed as it is a
> very old feature of MetaFun.
>
> The solution is
> draw rawtextext("\externalfigure[cow]") xsized 5cm ;
> where one can use xsized, ysized or xysized (taking a pair).
That works indeed. Thanks.
Marco
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________
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* Re: Scale image in MetaPost, maintaining aspect ratio
2018-07-07 23:45 ` Marco Patzer
@ 2018-07-08 8:39 ` Hans Hagen
2018-07-08 9:02 ` Marco Patzer
0 siblings, 1 reply; 9+ messages in thread
From: Hans Hagen @ 2018-07-08 8:39 UTC (permalink / raw)
To: mailing list for ConTeXt users, Marco Patzer
On 7/8/2018 1:45 AM, Marco Patzer wrote:
> On Sat, 7 Jul 2018 14:27:38 -0600
> Alan Braslau <braslau.list@comcast.net> wrote:
>
>> For "historic" reasons,
>> draw externalfigure "cow" scaled 5cm ;
>> normalizes the figure to a square. This will not be changed as it is a
>> very old feature of MetaFun.
>>
>> The solution is
>> draw rawtextext("\externalfigure[cow]") xsized 5cm ;
>> where one can use xsized, ysized or xysized (taking a pair).
>
> That works indeed. Thanks.
draw figure "...." ...
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Scale image in MetaPost, maintaining aspect ratio
2018-07-08 8:39 ` Hans Hagen
@ 2018-07-08 9:02 ` Marco Patzer
2018-07-08 9:21 ` Hans Hagen
0 siblings, 1 reply; 9+ messages in thread
From: Marco Patzer @ 2018-07-08 9:02 UTC (permalink / raw)
To: Hans Hagen; +Cc: mailing list for ConTeXt users
On Sun, 8 Jul 2018 10:39:52 +0200
Hans Hagen <j.hagen@xs4all.nl> wrote:
> On 7/8/2018 1:45 AM, Marco Patzer wrote:
> > On Sat, 7 Jul 2018 14:27:38 -0600
> > Alan Braslau <braslau.list@comcast.net> wrote:
> >
> >> For "historic" reasons,
> >> draw externalfigure "cow" scaled 5cm ;
> >> normalizes the figure to a square. This will not be changed as it
> >> is a very old feature of MetaFun.
> >>
> >> The solution is
> >> draw rawtextext("\externalfigure[cow]") xsized 5cm ;
> >> where one can use xsized, ysized or xysized (taking a pair).
> >
> > That works indeed. Thanks.
> draw figure "...." ...
That's what I was looking for. Thanks.
Marco
___________________________________________________________________________________
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Scale image in MetaPost, maintaining aspect ratio
2018-07-08 9:02 ` Marco Patzer
@ 2018-07-08 9:21 ` Hans Hagen
2018-07-08 15:49 ` Alan Braslau
0 siblings, 1 reply; 9+ messages in thread
From: Hans Hagen @ 2018-07-08 9:21 UTC (permalink / raw)
To: Marco Patzer; +Cc: mailing list for ConTeXt users
On 7/8/2018 11:02 AM, Marco Patzer wrote:
> On Sun, 8 Jul 2018 10:39:52 +0200
> Hans Hagen <j.hagen@xs4all.nl> wrote:
>
>> On 7/8/2018 1:45 AM, Marco Patzer wrote:
>>> On Sat, 7 Jul 2018 14:27:38 -0600
>>> Alan Braslau <braslau.list@comcast.net> wrote:
>>>
>>>> For "historic" reasons,
>>>> draw externalfigure "cow" scaled 5cm ;
>>>> normalizes the figure to a square. This will not be changed as it
>>>> is a very old feature of MetaFun.
>>>>
>>>> The solution is
>>>> draw rawtextext("\externalfigure[cow]") xsized 5cm ;
>>>> where one can use xsized, ysized or xysized (taking a pair).
>>>
>>> That works indeed. Thanks.
>> draw figure "...." ...
>
> That's what I was looking for. Thanks.
the "externalfigure" variant is an old one that had to deal with
dimensions in a way that avoids overflows
in a future context (read luatex 1.09+) we go one-pass-mp so we can have
a different approach (i never wanted to add a ton of code for images) so
there externalfigure will scale proportionally too
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
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___________________________________________________________________________________
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Scale image in MetaPost, maintaining aspect ratio
2018-07-08 9:21 ` Hans Hagen
@ 2018-07-08 15:49 ` Alan Braslau
0 siblings, 0 replies; 9+ messages in thread
From: Alan Braslau @ 2018-07-08 15:49 UTC (permalink / raw)
To: mailing list for ConTeXt users
On Sun, 8 Jul 2018 11:21:55 +0200
Hans Hagen <j.hagen@xs4all.nl> wrote:
> the "externalfigure" variant is an old one that had to deal with
> dimensions in a way that avoids overflows
>
> in a future context (read luatex 1.09+) we go one-pass-mp so we can
> have a different approach (i never wanted to add a ton of code for
> images) so there externalfigure will scale proportionally too
ConTeXt running on the luatex experimental branch under development
indeed works with one-pass-MP calculations as opposed to the two-pass
mechanism that is standard today. For documents with extensive and
complicated MP graphics, this yields a huge gain. Hans is at present
working out all side-effects (such as recursive MP/TeX/lua calls) and is
cleaning up some old ways of doing things that date from mkii. This
might seem somewhat minor but is really exciting for those who use a
lot of graphics and MetaPost effects.
Alan
___________________________________________________________________________________
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* Re: Scale image in MetaPost, maintaining aspect ratio
2018-07-07 18:58 Scale image in MetaPost, maintaining aspect ratio Marco Patzer
2018-07-07 20:27 ` Alan Braslau
@ 2018-07-07 20:27 ` Hans Hagen
2018-07-07 23:35 ` Marco Patzer
1 sibling, 1 reply; 9+ messages in thread
From: Hans Hagen @ 2018-07-07 20:27 UTC (permalink / raw)
To: mailing list for ConTeXt users
On 7/7/2018 8:58 PM, Marco Patzer wrote:
> Hi!
>
> How to scale an image in MetaPost, maintaining the aspect ratio
> (without specifying the height explicitly)?
>
> Example:
>
> \setupexternalfigures [location=default]
> \starttext
> \externalfigure [cow][width=5cm]
>
> \startMPcode
> draw externalfigure "cow" scaled 5cm;
> \stopMPcode
> \stoptext
it's all in the metafun manual
xsized 5cm
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: Scale image in MetaPost, maintaining aspect ratio
2018-07-07 20:27 ` Hans Hagen
@ 2018-07-07 23:35 ` Marco Patzer
0 siblings, 0 replies; 9+ messages in thread
From: Marco Patzer @ 2018-07-07 23:35 UTC (permalink / raw)
To: ntg-context
On Sat, 7 Jul 2018 22:27:51 +0200
Hans Hagen <j.hagen@xs4all.nl> wrote:
> On 7/7/2018 8:58 PM, Marco Patzer wrote:
> > Hi!
> >
> > How to scale an image in MetaPost, maintaining the aspect ratio
> > (without specifying the height explicitly)?
> >
> > Example:
> >
> > \setupexternalfigures [location=default]
> > \starttext
> > \externalfigure [cow][width=5cm]
> >
> > \startMPcode
> > draw externalfigure "cow" scaled 5cm;
> > \stopMPcode
> > \stoptext
> it's all in the metafun manual
No doubts about that. It's more a matter of knowing what to search
for.
> xsized 5cm
I tried it, same result - square image:
draw externalfigure "cow" xsized 5cm;
As Alan mentioned including the image with textext() works. Not as
elegant, but it gets the job done.
Marco
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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archive : https://bitbucket.org/phg/context-mirror/commits/
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___________________________________________________________________________________
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2018-07-07 18:58 Scale image in MetaPost, maintaining aspect ratio Marco Patzer
2018-07-07 20:27 ` Alan Braslau
2018-07-07 23:45 ` Marco Patzer
2018-07-08 8:39 ` Hans Hagen
2018-07-08 9:02 ` Marco Patzer
2018-07-08 9:21 ` Hans Hagen
2018-07-08 15:49 ` Alan Braslau
2018-07-07 20:27 ` Hans Hagen
2018-07-07 23:35 ` Marco Patzer
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