POV-Ray : Newsgroups : povray.general : text with background Server Time: 19 Aug 2019 14:10:03 GMT
  text with background (Message 1 to 4 of 4)  
From: Kima
Subject: text with background
Date: 4 Aug 2019 19:05:00
Message: <web.5d472b3237fd6e25ecc0fada0@news.povray.org>
I know I can put a text object on a geometrical shape by techniques such as
"difference", but in this case, I need to know the width of the text to create
an object with the same size?

How can I set a background for a text object when I don't know the width/length
of the text?


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From: William F Pokorny
Subject: Re: text with background
Date: 5 Aug 2019 11:09:04
Message: <5d480e50$1@news.povray.org>
On 8/4/19 3:00 PM, Kima wrote:
> I know I can put a text object on a geometrical shape by techniques such as
> "difference", but in this case, I need to know the width of the text to create
> an object with the same size?
> 
> How can I set a background for a text object when I don't know the width/length
> of the text?
> 
Hi. There are min_extent(), max_extent() object bounding box commands.

For what you are doing though, the object pattern using your text as the 
object is perhaps easier. See the shipped sample scene

<install dir>/scene/advanced/object_pattern.pov

or the more interesting abyss.pov where the PERSISTENCE text is written 
on the submarine (not perfectly aligned) using the object pattern.

You can find the most current sample scenes online at:

https://github.com/POV-Ray/povray/distribution.

Bill P.


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From: Alain
Subject: Re: text with background
Date: 5 Aug 2019 16:33:30
Message: <5d485a5a$1@news.povray.org>
Le 19-08-04 à 15:00, Kima a écrit :
> I know I can put a text object on a geometrical shape by techniques such as
> "difference", but in this case, I need to know the width of the text to create
> an object with the same size?
> 
> How can I set a background for a text object when I don't know the width/length
> of the text?
> 
> 
> 

I By using min_extent(), max_extent(), you'll get the extent of your 
text object.

In fact, you only need to use max_extent(TextObject).x in the present 
context as text objects start at x=0 and build top the right, or +x 
direction.

(max_extent(TextObject).y - min_extent(TextObject).y) will return the 
height. Using min_extent is needed to take into account the descender of 
some letters :«y», «q», «j» and «g».


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From: Bald Eagle
Subject: Re: text with background
Date: 5 Aug 2019 17:45:06
Message: <web.5d486a40a6d63a3a4eec112d0@news.povray.org>
Just throwing this reference ink in in case some of these directives may help
with anything else you're doing.

http://wiki.povray.org/content/Reference:Strings

It's often helpful to make a second object {} or transparent box or a wire box
(shapes2.inc) as a marker or placeholder when you're doing differences, since
all of the things you're differencing from the parent object don't show up....

Just in case that saves you some headaches...


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