Asking context to switch to a different font for a single character in many places

Asking context to switch to a different font for a single character in many places

[Ajith R via ntg-context]

Hi,
I am trying to prepare a moderate sized document in Malayalam using
Context. Overall I have been successful. However, there are a few rough
edges for which I need help. This is the fifth problem I face.

Is it possible to instruct Context to use a font in general, except for
a single character? I want to show the space character with open box,␣
U+2423. However, the font doesn't have that character. The open box
character shows up in many places within an otherwise Malayalam text.
So, switching font is not possible. For the time being, I am using a
substitution. However, I would like to know if it is possible.

Thanks,
ajith
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Re: Asking context to switch to a different font for a single character in many places

[kauśika via ntg-context]

On Friday, December 31, 2021 6:30:26 PM IST Ajith R via ntg-context wrote:
> Is it possible to instruct Context to use a font in general, except for
> a single character?

Since you have mentioned elsewhere that you have \definefontfamily[…] you can 
set a fallback font family with \definefallbackfamily[…] and choose a font 
which has the character you want:

⋮
\definefallbackfamily[mainfont][rm][Latin Modern]
[range=controlpictures,force=yes]
\definefontfamily[mainfont] […]
⋮
\setupbodyfont[mainfont]

The 'controlpictures' Unicode block (≡ U+2400 – U+243F) contains the character 
you want.

kauśika


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Re: Asking context to switch to a different font for a single character in many places

[Ajith R via ntg-context]

On Fri, 31 Dec 2021 20:54:16 +0530
kauśika <citturs@gmail.com> wrote:

> On Friday, December 31, 2021 6:30:26 PM IST Ajith R via ntg-context
> wrote:
> > Is it possible to instruct Context to use a font in general, except
> > for a single character?  
> 
> Since you have mentioned elsewhere that you have \definefontfamily[…]
> you can set a fallback font family with \definefallbackfamily[…] and
> choose a font which has the character you want:
> 
> ⋮
> \definefallbackfamily[mainfont][rm][Latin Modern]
> [range=controlpictures,force=yes]
> \definefontfamily[mainfont] […]
> ⋮
> \setupbodyfont[mainfont]
> 
> The 'controlpictures' Unicode block (≡ U+2400 – U+243F) contains the
> character you want.
> 
> kauśika
> 
> 

Hi Kausika,

This is what I tried -

\definefallbackfamily [mainfont]
	[rm]
	[Latin Modern]
	[range=controlpictures,force=yes]
\definefontfamily [mainfont]
	[rm]
	[RIT-Rachana]
	[features=malayalam-two]
\setupbodyfont [mainfont]

\starttext

\title{മലയാളലിപികളുടെ ആവൃത്തി നിർണ്ണയം}
␣
\stoptext

This doesn't print the open box. If I remove the definefontfamily
command or define font family using only Latin Modern, open box is
printed, but not the title.

What am I missing?

Thanks,
ajith
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___________________________________________________________________________________

Re: Asking context to switch to a different font for a single character in many places

[kauśika via ntg-context]

On Saturday, January 1, 2022 1:37:49 PM IST Ajith R wrote:
> This doesn't print the open box. If I remove the definefontfamily
> command or define font family using only Latin Modern, open box is
> printed, but not the title.
> 
> What am I missing?

Try with the following:

\definefallbackfamily
  [malayalam]
  [serif]
  [TeX Gyre Pagella][range=controlpictures,force=yes]
\definefontfamily
  [malayalam]
  [serif]
  [RIT Rachana][features=malayalam-two]

\setupbodyfont[malayalam]


I have tested that this works on my system. Ensure that the TeX Gyre Pagella 
font is available on your system (ConTeXt ships with a copy of this font). If 
it still does not work check the log file for any messages regarding fallback 
font.

kauśika


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___________________________________________________________________________________

Re: Asking context to switch to a different font for a single character in many places

[Ajith R via ntg-context]

On Sat, 01 Jan 2022 14:28:12 +0530
kauśika <citturs@gmail.com> wrote:


> Try with the following:
> 
> \definefallbackfamily
>   [malayalam]
>   [serif]
>   [TeX Gyre Pagella][range=controlpictures,force=yes]
> \definefontfamily
>   [malayalam]
>   [serif]
>   [RIT Rachana][features=malayalam-two]
> 
> \setupbodyfont[malayalam]
> 
> 
> I have tested that this works on my system. Ensure that the TeX Gyre
> Pagella font is available on your system (ConTeXt ships with a copy
> of this font). If it still does not work check the log file for any
> messages regarding fallback font.
> 
> kauśika
> 
> 

Hi Kaushika,

Thanks. This is working.
But, I don't understand why this is working while the other wasn't even
when it could display the open box when it was the solo font defined?

Thanks,
ajith

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___________________________________________________________________________________

Re: Asking context to switch to a different font for a single character in many places

[Ajith R via ntg-context]

On Sat, 01 Jan 2022 14:28:12 +0530
kauśika <citturs@gmail.com> wrote:


> Try with the following:
> 
> \definefallbackfamily
>   [malayalam]
>   [serif]
>   [TeX Gyre Pagella][range=controlpictures,force=yes]
> \definefontfamily
>   [malayalam]
>   [serif]
>   [RIT Rachana][features=malayalam-two]
> 
> \setupbodyfont[malayalam]
> 
> 
> I have tested that this works on my system. Ensure that the TeX Gyre
> Pagella font is available on your system (ConTeXt ships with a copy
> of this font). If it still does not work check the log file for any
> messages regarding fallback font.
> 
> kauśika
> 
> 

Hi Kaushika,

Thanks. This is working.
But, I don't understand why this is working while the other wasn't even
when it could display the open box when it was the solo font defined?

Thanks,
ajith

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Re: Asking context to switch to a different font for a single character in many places

[Wolfgang Schuster via ntg-context]

Ajith R via ntg-context schrieb am 01.01.2022 um 11:06:
> On Sat, 01 Jan 2022 14:28:12 +0530
> kauśika <citturs@gmail.com> wrote:
>
>> Try with the following:
>>
>> \definefallbackfamily
>>    [malayalam]
>>    [serif]
>>    [TeX Gyre Pagella][range=controlpictures,force=yes]
>> \definefontfamily
>>    [malayalam]
>>    [serif]
>>    [RIT Rachana][features=malayalam-two]
>>
>> \setupbodyfont[malayalam]
>>
>>
>> I have tested that this works on my system. Ensure that the TeX Gyre
>> Pagella font is available on your system (ConTeXt ships with a copy
>> of this font). If it still does not work check the log file for any
>> messages regarding fallback font.
>>
>> kauśika
> Hi Kaushika,
>
> Thanks. This is working.
> But, I don't understand why this is working while the other wasn't even
> when it could display the open box when it was the solo font defined?

You used "Latin Modern" which isn't a valid font name, the correct name 
is "Latin Modern Roman".

Wolfgang

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Re: Asking context to switch to a different font for a single character in many places

[Ajith R via ntg-context]

On Sat, 1 Jan 2022 11:25:34 +0100
Wolfgang Schuster <wolfgang.schuster.lists@gmail.com> wrote:

> 
> You used "Latin Modern" which isn't a valid font name, the correct
> name is "Latin Modern Roman".
> 
> Wolfgang
> 

Hi,

Thanks for that info. So, when I used "Latin Modern" as the font
definition, Context falls back to a system defined default? Was that
the reason why in that situation, Context was able to display the open
box, though not able to display Malayalam?

Thanks,
ajith

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