Re: Calculate string width using some font.

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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.




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