Calculate string width using some font.

Hey list! :)

I've got a problem trying to calculate a string width using an X font
with some Y font size to use in an svg-to-pdf conversion.

This is what I try to do:
1. Create a dummy image.
2. Set the text there using font X and the font size Y (it seems that
when I create the image it renders it at 72dpi so I need to reduce it at
300dpi)

I'm not sure what the imagettftext() function returns, are those values
measured in pixels ? I read in some page that the proportion to reduce
the image at 300dpi is reduce the size to 24% of its original size.

http://www.printingforless.com/resolution.html

That's the code:

***

// Create dummy image.
$rsc_image = imagecreate( 1, 1 );

// Set image.
$arr_ftx = imagettftext( $rsc_image, $int_font_size, 0, 0, 0, -1,
"./fonts/{$str_font_file}", $str_variable_value );
// Destroy dummy image.
imagedestroy( $rsc_image );

// Set structure of widths.
// TODO: Magik numbers.
$arr_variable_pixels[$str_variable_index] = ( ( $arr_ftx[2] * 24 ) / 100 );

***

Thx for any help.

Juan Felipe Alvarez Saldarriaga wrote:
> Hey list! :)

my name's not list but what the heck:

take a look at these function, they should light the way:

http://php.net/manual/en/function.imageftbbox.php
http://php.net/manual/en/function.imagepsbbox.php
http://php.net/manual/en/function.imagettfbbox.php
http://php.net/imageloadfont

everything is pixels.

there is no dpi - your screen & printer has a certain dpi and that determine
how big the image displays on either.

okay not much help - I had brain freeze half thru.

>
> I've got a problem trying to calculate a string width using an X font
> with some Y font size to use in an svg-to-pdf conversion.
>
> This is what I try to do:
> 1. Create a dummy image.
> 2. Set the text there using font X and the font size Y (it seems that
> when I create the image it renders it at 72dpi so I need to reduce it at
> 300dpi)
>
> I'm not sure what the imagettftext() function returns, are those values
> measured in pixels ?

yes.

> I read in some page that the proportion to reduce
> the image at 300dpi is reduce the size to 24% of its original size.
>
> http://www.printingforless.com/resolution.html
>
> That's the code:
>
> ***
>
> // Create dummy image.
> $rsc_image = imagecreate( 1, 1 );
>
> // Set image.
> $arr_ftx = imagettftext( $rsc_image, $int_font_size, 0, 0, 0, -1,
> "./fonts/{$str_font_file}", $str_variable_value );
> // Destroy dummy image.
> imagedestroy( $rsc_image );
>
> // Set structure of widths.
> // TODO: Magik numbers.
> $arr_variable_pixels[$str_variable_index] = ( ( $arr_ftx[2] * 24 ) / 100 );
>
> ***
>
> Thx for any help.
>

Jochem Maas wrote:
> Juan Felipe Alvarez Saldarriaga wrote:
>
>> Hey list! :)
>>
>
> my name's not list but what the heck:
>
> take a look at these function, they should light the way:
>
> http://php.net/manual/en/function.imageftbbox.php
> http://php.net/manual/en/function.imagepsbbox.php
> http://php.net/manual/en/function.imagettfbbox.php
> http://php.net/imageloadfont
>
> everything is pixels.
>
> there is no dpi - your screen & printer has a certain dpi and that determine
> how big the image displays on either.
>
> okay not much help - I had brain freeze half thru.
>
>

K, np, Ill try use imagettfbbox() function instead.

Thx.
>> I've got a problem trying to calculate a string width using an X font
>> with some Y font size to use in an svg-to-pdf conversion.
>>
>> This is what I try to do:
>> 1. Create a dummy image.
>> 2. Set the text there using font X and the font size Y (it seems that
>> when I create the image it renders it at 72dpi so I need to reduce it at
>> 300dpi)
>>
>> I'm not sure what the imagettftext() function returns, are those values
>> measured in pixels ?
>>
>
> yes.
>
>
>> I read in some page that the proportion to reduce
>> the image at 300dpi is reduce the size to 24% of its original size.
>>
>> http://www.printingforless.com/resolution.html
>>
>> That's the code:
>>
>> ***
>>
>> // Create dummy image.
>> $rsc_image = imagecreate( 1, 1 );
>>
>> // Set image.
>> $arr_ftx = imagettftext( $rsc_image, $int_font_size, 0, 0, 0, -1,
>> "./fonts/{$str_font_file}", $str_variable_value );
>> // Destroy dummy image.
>> imagedestroy( $rsc_image );
>>
>> // Set structure of widths.
>> // TODO: Magik numbers.
>> $arr_variable_pixels[$str_variable_index] = ( ( $arr_ftx[2] * 24 ) / 100 );
>>
>> ***
>>
>> Thx for any help.
>>
>>
>
>
>

pdf_stringwidth() may help you

regards fra*


> >> Hey list! :)
> >>
> >
> > my name's not list but what the heck:
> >
> > take a look at these function, they should light the way:
> >
> > http://php.net/manual/en/function.imageftbbox.php
> > http://php.net/manual/en/function.imagepsbbox.php
> > http://php.net/manual/en/function.imagettfbbox.php
> > http://php.net/imageloadfont
> >
> > everything is pixels.
> >
> > there is no dpi - your screen & printer has a certain dpi and that
determine
> > how big the image displays on either.
> >
> > okay not much help - I had brain freeze half thru.
> >
> >
>
> K, np, Ill try use imagettfbbox() function instead.
>
> Thx.
> >> I've got a problem trying to calculate a string width using an X font
> >> with some Y font size to use in an svg-to-pdf conversion.
> >>
> >> This is what I try to do:
> >> 1. Create a dummy image.
> >> 2. Set the text there using font X and the font size Y (it seems that
> >> when I create the image it renders it at 72dpi so I need to reduce it
at
> >> 300dpi)
> >>
> >> I'm not sure what the imagettftext() function returns, are those
values
> >> measured in pixels ?
> >>
> >
> > yes.
> >
> >
> >> I read in some page that the proportion to reduce
> >> the image at 300dpi is reduce the size to 24% of its original size.
> >>
> >> http://www.printingforless.com/resolution.html
> >>
> >> That's the code:
> >>
> >> ***
> >>
> >> // Create dummy image.
> >> $rsc_image = imagecreate( 1, 1 );
> >>
> >> // Set image.
> >> $arr_ftx = imagettftext( $rsc_image, $int_font_size, 0, 0, 0, -1,
> >> "./fonts/{$str_font_file}", $str_variable_value );
> >> // Destroy dummy image.
> >> imagedestroy( $rsc_image );
> >>
> >> // Set structure of widths.
> >> // TODO: Magik numbers.
> >> $arr_variable_pixels[$str_variable_index] = ( ( $arr_ftx[2] * 24 ) /
100 );
> >>
> >> ***
> >>
> >> Thx for any help.
> >>
> >>
> >
> >
> >

setcookie wrote:
> pdf_stringwidth() may help you
>
> regards fra*
>
>
>

Yea I saw that too but you know, pdflib is not free.

>>>> Hey list! :)
>>>>
>>>>
>>> my name's not list but what the heck:
>>>
>>> take a look at these function, they should light the way:
>>>
>>> http://php.net/manual/en/function.imageftbbox.php
>>> http://php.net/manual/en/function.imagepsbbox.php
>>> http://php.net/manual/en/function.imagettfbbox.php
>>> http://php.net/imageloadfont
>>>
>>> everything is pixels.
>>>
>>> there is no dpi - your screen & printer has a certain dpi and that
>>>
> determine
>
>>> how big the image displays on either.
>>>
>>> okay not much help - I had brain freeze half thru.
>>>
>>>
>>>
>> K, np, Ill try use imagettfbbox() function instead.
>>
>> Thx.
>>
>>>> I've got a problem trying to calculate a string width using an X font
>>>> with some Y font size to use in an svg-to-pdf conversion.
>>>>
>>>> This is what I try to do:
>>>> 1. Create a dummy image.
>>>> 2. Set the text there using font X and the font size Y (it seems that
>>>> when I create the image it renders it at 72dpi so I need to reduce it
>>>>
> at
>
>>>> 300dpi)
>>>>
>>>> I'm not sure what the imagettftext() function returns, are those
>>>>
> values
>
>>>> measured in pixels ?
>>>>
>>>>
>>> yes.
>>>
>>>
>>>
>>>> I read in some page that the proportion to reduce
>>>> the image at 300dpi is reduce the size to 24% of its original size.
>>>>
>>>> http://www.printingforless.com/resolution.html
>>>>
>>>> That's the code:
>>>>
>>>> ***
>>>>
>>>> // Create dummy image.
>>>> $rsc_image = imagecreate( 1, 1 );
>>>>
>>>> // Set image.
>>>> $arr_ftx = imagettftext( $rsc_image, $int_font_size, 0, 0, 0, -1,
>>>> "./fonts/{$str_font_file}", $str_variable_value );
>>>> // Destroy dummy image.
>>>> imagedestroy( $rsc_image );
>>>>
>>>> // Set structure of widths.
>>>> // TODO: Magik numbers.
>>>> $arr_variable_pixels[$str_variable_index] = ( ( $arr_ftx[2] * 24 ) /
>>>>
> 100 );
>
>>>> ***
>>>>
>>>> Thx for any help.
>>>>
>>>>
>>>>
>>>
>>>
>
>

At 2:54 PM -0500 2/5/07, Juan Felipe Alvarez Saldarriaga wrote:
>setcookie wrote:
>>pdf_stringwidth() may help you
>>
>>regards fra*
>>
>>
>
>Yea I saw that too but you know, pdflib is not free.

Yes, but there's a free version -- Google fpdf.

tedd
--
-------
http://sperling.com http://ancientstones.com http://earthstones.com

On Mon, February 5, 2007 11:22 am, Juan Felipe Alvarez Saldarriaga wrote:
> 1. Create a dummy image.
> 2. Set the text there using font X and the font size Y (it seems that
> when I create the image it renders it at 72dpi so I need to reduce it
> at
> 300dpi)

When I did a 300-dpi PDF thingie, I defined a variable $resolution
which was 304.8, and multiplied it by the inches I wanted to get 300
dpi out...

I don't know *how* I got the 304.8 number...

> I'm not sure what the imagettftext() function returns, are those
> values
> measured in pixels ?

I believe those are in raw pixels, yes.

> I read in some page that the proportion to reduce
> the image at 300dpi is reduce the size to 24% of its original size.

You'd want to make it 300/72 times as large as you would think?

Only I obviously didn't do that, so I dunno...

> http://www.printingforless.com/resolution.html
>
> That's the code:
>
> ***
>
> // Create dummy image.
> $rsc_image = imagecreate( 1, 1 );
>
> // Set image.
> $arr_ftx = imagettftext( $rsc_image, $int_font_size, 0, 0, 0, -1,
> "./fonts/{$str_font_file}", $str_variable_value );
> // Destroy dummy image.
> imagedestroy( $rsc_image );
>
> // Set structure of widths.
> // TODO: Magik numbers.
> $arr_variable_pixels[$str_variable_index] = ( ( $arr_ftx[2] * 24 ) /
> 100 );

I think you've got the percentage backwards here, as it's 24% to go
from 300 to 72... You want to force a 72 DPI thing to end up being
scalable down by 24% to end up at 300.

--
Some people have a "gift" link here.
Know what I want?
I want you to buy a CD from some starving artist.
http://cdbaby.com/browse/from/lynch
Yeah, I get a buck. So?

On Mon, February 5, 2007 1:54 pm, Juan Felipe Alvarez Saldarriaga wrote:
> setcookie wrote:
>> pdf_stringwidth() may help you
>>
>> regards fra*
>>
>>
>>
>
> Yea I saw that too but you know, pdflib is not free.

Depends on your usage and if you need the PDI part or not...

PDI == Smush two PDF together.

--
Some people have a "gift" link here.
Know what I want?
I want you to buy a CD from some starving artist.
http://cdbaby.com/browse/from/lynch
Yeah, I get a buck. So?