Any tip for adding text around the perimeter of a circle with the text on
the bottom as well as the text on the top being upright?

Since the letters are lined up at the axis with the lower left corner of the
letter, translating and then rotating the text leaves the text on the bottom
closer to the axis than that on the top.

Thank you,
 -Shay

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In article <3a36886a@news.povray.org>, "Shay" <sen### [at] hotmailcom> 
wrote:

> Any tip for adding text around the perimeter of a circle with the text on
> the bottom as well as the text on the top being upright?
> 
> Since the letters are lined up at the axis with the lower left corner 
> of the letter, translating and then rotating the text leaves the text 
> on the bottom closer to the axis than that on the top.

You do it letter-by-letter, translating and rotating as needed. For 
instance, for letters on a circle of R radius in the xy plane, for the 
letters on top, you would translate by y*R then rotate by z*letterAngle. 
For letters on the bottom, you would translate by y*(R+letterHeight) and 
then do the usual rotate.
This is easiest with MegaPOV, where you could use the min_extent() and 
max_extent() functions to get the size of each letter, in the current 
official version, you would have to position each letter manually, a big 
pain even with fixed-width fonts.
It wouldn't be hard to make a macro to do this in MegaPOV, though. (I 
think Ron Parker wrote a macro to do something similar, you could 
probably modify it to do what you want. You could probably find it in 
one of the scene file groups.)

-- 
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/

<><

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Chris Huff wrote:

> (I think Ron Parker wrote a macro to do something similar, you could 
>probably modify it to do what you want. You could probably find it in 
>one of the scene file groups.)
>

Newsgroups: povray.programming
Subject: Circular font macros
Date: Sun, 27 Feb 2000 20:39:24 -0500
From: Lummox JR <Lum### [at] aolcom>
Message-ID: <38B### [at] aolcom>

Ingo

-- 
Photography: http://members.home.nl/ingoogni/
Pov-Ray    : http://members.home.nl/seed7/

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Shay wrote:
> 
> Any tip for adding text around the perimeter of a circle with the text on
> the bottom as well as the text on the top being upright?
> 
> Since the letters are lined up at the axis with the lower left corner of the
> letter, translating and then rotating the text leaves the text on the bottom
> closer to the axis than that on the top.

	For the longest time I thought that would be too hard to manually in
photoshop. Then one day I did it. The first attempt was good enough. 

	But divide by the number of letters to find the degrees apart. Create
each letter separately. R being the radius of your circle, x = r
sin(angle) y = r cos(angle). Add a little to r for the descenders below
the line.

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On Tue, 12 Dec 2000 20:29:35 -0500, Matt Giwer wrote:
>	But divide by the number of letters to find the degrees apart. Create
>each letter separately. R being the radius of your circle, x = r
>sin(angle) y = r cos(angle). Add a little to r for the descenders below
>the line.

If you're using a proportional font, don't just divide by the number of 
letters.  Multiply the width of the letter by the total angle you want the
text to cover, then divide by the width of the text.

-- 
Ron Parker   http://www2.fwi.com/~parkerr/traces.html
My opinions.  Mine.  Not anyone else's.

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Ron Parker wrote:

> On Tue, 12 Dec 2000 20:29:35 -0500, Matt Giwer wrote:

> >       But divide by the number of letters to find the degrees apart. Create
> >each letter separately. R being the radius of your circle, x = r
> >sin(angle) y = r cos(angle). Add a little to r for the descenders below
> >the line.

> If you're using a proportional font, don't just divide by the number of
> letters.  Multiply the width of the letter by the total angle you want the
> text to cover, then divide by the width of the text.

	Well taken. But ...  

	If I read the description in the docs correctly, the first letter (and
I say create one letter at a time, rotate (see oops!) and translate
separately) starts at 0,0 x,y with descenders in -y. Therefore if
creating single letters and moving them the proportional spacing has no
impact. 

	One might wish to shift them by half the spacing to see what looks
better. I can not think of a logo as being described that uses true
proportional spacing. 

Oops!

	Rotate before translate by the angle of placement, the first letter by
minus z angle. 

-- 
Any activity that can be put at risk of being regulated requires
those involved to become political contributors. The Mafia was 
more honest about it. 
	-- The Iron Webmaster, 115

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On Tue, 12 Dec 2000 23:16:28 -0500, Matt Giwer wrote:
>
>	If I read the description in the docs correctly, the first letter (and
>I say create one letter at a time, rotate (see oops!) and translate
>separately) starts at 0,0 x,y with descenders in -y. Therefore if
>creating single letters and moving them the proportional spacing has no
>impact. 

It will have an impact on the appearance, though.  Letters that are designed
narrow will have too much space around them.

-- 
Ron Parker   http://www2.fwi.com/~parkerr/traces.html
My opinions.  Mine.  Not anyone else's.

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Ron Parker wrote:

> On Tue, 12 Dec 2000 23:16:28 -0500, Matt Giwer wrote:

> >       If I read the description in the docs correctly, the first letter (and
> >I say create one letter at a time, rotate (see oops!) and translate
> >separately) starts at 0,0 x,y with descenders in -y. Therefore if
> >creating single letters and moving them the proportional spacing has no
> >impact.

> It will have an impact on the appearance, though.  Letters that are designed
> narrow will have too much space around them.

	Give it a try and see how it looks is all I can say. 

	While I am certain some typefaces are designed to look best in
proportional, the difference is mostly in not centering the character in
a fixed sized bit space. They are defined in vector space rather than
bit space. It is setting the proportional "bit" and by the type of font
(.ttf and whatever) letting the font driver fit it with the default
kerning or user set kerning if that is available. 

	The essentials of that are in the docs on the text type. 

	At some point I am going to have to ask if you are interested in
helping the man with his question or counting coup on me. You do have a
feel for why Tex filled seven thick volumes before whatisname gave up? 

-- 
Dumber than a West Palm Democrat. 
	-- The Iron Webmaster, 336

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On Wed, 13 Dec 2000 00:17:08 -0500, Matt Giwer wrote:
>	At some point I am going to have to ask if you are interested in
>helping the man with his question or counting coup on me. You do have a
>feel for why Tex filled seven thick volumes before whatisname gave up? 

I could ask the same question.  I'm so interested in how text works that 
I've actually written POV macros to determine kerning and leading and other
interesting properties you can't get from a single letter, and I was the
original author of the min_extent and max_extent patches that are instrumental
in getting that information in the first place.  What have you done lately?

I am trying to help the man with his question.  You gave advice that could 
lead to less-than-perfect-looking results, and I tried to bolster it with 
a small suggestion.  That you took it as a personal insult is a sign of your
character flaw, not mine.

-- 
Ron Parker   http://www2.fwi.com/~parkerr/traces.html
My opinions.  Mine.  Not anyone else's.

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On Tue, 12 Dec 2000 16:19:06 -0500, Chris Huff wrote:
>It wouldn't be hard to make a macro to do this in MegaPOV, though. (I 
>think Ron Parker wrote a macro to do something similar, you could 
>probably modify it to do what you want. You could probably find it in 
>one of the scene file groups.)

I hadn't before, but I threw one together this morning just for fun. 
It's in povray.text.scene-files.

-- 
Ron Parker   http://www2.fwi.com/~parkerr/traces.html
My opinions.  Mine.  Not anyone else's.

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