Last updated: Fri, 20 Jun 2008

imagepstext

(PHP 4, PHP 5)

imagepstext — Dessine un texte sur une image avec une police PostScript Type1

Description

array imagepstext ( resource $image , string $text , resource $font , int $size , int $foreground , int $background , int $x , int $y [, int $space [, int $tightness [, float $angle [, int $antialias_steps ]]]] )

Dessine un texte sur une image avec une police PostScript Type1.

Reportez-vous à la documentation PostScript pour avoir des détails à propos des polices et de leurs tailles.

Liste de paramètres

image: Une ressource d'image, retourné par une des fonctions de création d'images, comme imagecreatetruecolor().
text: Le texte à écrire.
font: Peut être 1, 2, 3, 4, 5 pour les polices internes d'encodage Latin2 (où les plus grands nombres correspondent aux polices larges) ou n'importe quels identifiants de police de votre choix, enregistrées avec la fonction imageloadfont().
size: size est exprimé en pixels.
foreground: La couleur avec laquelle le texte va être dessiné.
background: La couleur d'antialiasing. Aucun pixel avec la couleur background n'est dessiné, ce qui fait que l'arrière-plan n'a pas besoin d'être dans une couleur fixe.
x: X : coordonnée du coin en bas, à gauche du premier caractère
y: Y : coordonnée du coin en bas, à gauche du premier caractère
space: Permet de changer la taille par défaut du caractère d'espacement. Cette valeur peut être négative. Exprimé en unité d'espaces caractère, ce qui vaut 1/1000ème d'un em-carré (un em : unité de mesure représentée par un carré dont la dimension horizontale est la même que le corps du caractère).
tightness: Permet de contrôler la quantité d'espace entre deux caractères. Cette valeur peut être négative. Exprimé en unité d'espaces caractère, ce qui vaut 1/1000ème d'un em-carré.
angle: angle est en degrés.
antialias_steps: Permet de contrôler le nombre de couleurs du texte antialiasé. Les valeurs autorisées sont 4 et 16. 16 est recommandée pour les polices de moins de 20 pixels, car l'effet est alors visible. Avec les tailles plus grandes, utilisez de préférence 4, qui est moins gourmande en ressources.

Valeurs de retour

Cette fonction retourne un tableau contenant les éléments suivants :

0	Abscisse inférieure gauche
1	Ordonnée inférieure gauche
2	Abscisse supérieure droite
3	Ordonnée supérieure droite

Notes

Note: Cette fonction n'est disponible que si PHP est compilé en utilisant --enable-t1lib[=DIR].

Voir aussi

imagepsbbox()

imagerectangle

imagepsslantfont

Last updated: Fri, 20 Jun 2008

add a note User Contributed Notes
imagepstext

whitemarker dot blogspot dot com
19-Sep-2007 11:28


The documentation above is bad.  It says $font:

"Can be 1, 2, 3, 4, 5 for built-in fonts in latin2 encoding (where higher numbers corresponding to larger fonts) or any of your own font identifiers registered with imageloadfont()."



But it can't.  When I put in 1,2,3,4,5 I get

"Warning: imagepstext() expects parameter 3 to be resource, integer given"



I get the same thing when using imageloadfont() because imageloadfont() also returns an integer.  The documentation should instead say: 

"resource returned from imagepsloadfont()."

chrislewis60 at hotmail dot com
23-Jul-2007 07:45


imagepstext() appears to be quite memory intensive and we had a problem where about 50% of the time the script would error. You need to make sure PHP has enough memory assigned to it - we had to increase PHP's allocation from 8MB to 16MB for a simple "hello world" example to work smoothly. 



If the png header was commented out it would sometimes error with a message like: 



Warning: imagepstext() [function.imagepstext]: T1Lib Error 11 or 14



and if the png header was there it would sometimes say: 



The image [...] cannot be displayed, because it contains errors.

honza dot bartos at gmail dot com
24-Oct-2006 04:38


The coordinates given by x, y represent actually a starting point of the text baseline. They represent the lower left corner of the first character only in case that any part of the character doesn't lie below baseline (it works for "Hello" but for "Howdy" it does not - because of letter y). There may be some small differences according to the font and size chosen.

heckp at uni-trier.de
10-Jul-2003 05:11


It is important so make shure that the "text" really is a string.



imagepstext ($im, $text, $font, $textsize, $black, $white, 10, 10);



won't work if $text is undefined, so PHP will quit with an error.



so always write it like this:



imagepstext ($im, "$text", $font, $textsize, $black, $white, 10, 10);

m.confalonieri(at)mclink.it
04-Jun-2003 06:00


I found a way to let imagepstext understand 32-bit colors (RGBA) by replacing in gd.c:PHP_FUNCTION(imagepstext)



int _fg, _bg, x, y, size, space = 0, aa_steps = 4, width = 0;



with



unsigned int _fg, _bg, x, y, size, space = 0, aa_steps = 4, width = 0;

Jeroen dot Straahof at newego dot nl
06-Feb-2003 06:12


I made a function that makes it easy to align text to the right

of an image. Below you can find the code because for me it

works great. You can also use it to center text as well, if you 

like to have that simply remove the -10 and split the result

of $imgwidth and $texwidth



function AlignRight($string, $font, $imgwidth, $fontsize) {

list($lx,$ly,$rx,$ry) = imagepsbbox($string,$font,$fontsize,0,0,0);

$textwidth = $rx - $lx;

$imw = ($imgwidth-10-$textwidth);

return $imw;

}

johan (at) 1way2print.net
06-Nov-2002 02:17


If you use fonts with special chars, remeber to read in the encoded file *.enc with imagepsencodefont ... etc. for Danish, Swedish, German.....

a at url dot de
18-Feb-2002 06:16


a note on kernnig:

t1lib tries to load a corresponding afm file in the directory of the font file.

it does this by replacing the extension (.PFB .pfb) with ".afm". note that this has to be a lowercase afm! usually windows-ps-fonts have file names in all-uppercase, so try renaming the *.AFM file to *.afm.



i also noticed that sometimes this gives an error -2. it seems like t1lib chokes on windows-linebreaks in the afm file.



try 'recode dos..lat1 fontfile.afm' and check again.



if it all works, combinations like "Ta" or "Te" should show the second letter slightly moved to the capital T (on normal fonts like Times anyway).

npdavis at hotmail dot com
24-May-2001 09:09


If you have a programming error in your code, using ImagePsText, sometimes t1lib crashes with an unrecoverable error. Because of this, httpd needs to be restarted. 





This problem only occurs if there is a programming error, but can drive you crazy when debugging, if you don't know about it. By killing the parent process(httpd) you "reset" t1lib. When debugging, if you get an error then make a code change, restart httpd before testing it again. This will save hours of frustration. Make it a habit to just restart httpd after every error, and you will be much happier.





Also, to see debugging messages, (if you are rendering x's) comment the jpeg header, and the ImageJpeg statement. You will get beautiful error messages. When you get a blank page, your ImagePsText code is working correctly. Uncomment the Header() and ImageJpeg() and see what you have. You might be passing parameters that render a white image with no text, but the code is working!





Numeric t1lib error messages can be decoded using the t1lib_doc.pdf file that comes with t1lib. PHP simply relays these errors from t1lib to the page. Please don't ask the PHP people about these errors... t1lib has beautiful documentation.... use it: )





thx,


Neil

npdavis at hotmail dot com
24-May-2001 08:56


One other thing... variables. It is important to convert variables to the proper type before they hit this function. In this respect, ImageTtfText is easier to work with. IE, if you pass a font size from one page to the next, via GPC, it becomes a string type. Sooo... use IntVal() to convert it to an integer type that ImagePsText can digest. In addition you must convert HTML special characters or use chr() to represent special characters. ImagePsFont will not decode   to represent a space, use Chr(32) or a space:





<?php


$fontsize=IntVal($fontsize);


$font=ImagePsLoadFont("fonts/IntR.pfb");


ImagePsText($im, $textstring, $font, $fontsize, $textcolor, $background, 0, $fontsize,'','','',16); //note antialias is set


ImagePsFreeFont($font);


?>





thx,


Neil

npdavis at hotmail dot com
22-May-2001 05:54


with a font included in t1lib:





<?PHP


Header ("Content-type: image/jpeg");


$im = ImageCreate (350, 45);


$black = ImageColorAllocate ($im, 0, 0, 0);


$white = ImageColorAllocate ($im, 255, 255, 255);


$font=ImagePsLoadFont("bchbi.pfb");


ImagePsText($im, "Testing... It worked!",


$font, 32, $white, $black, 32, 32);


ImagePsFreeFont($font); 


ImageJpeg($im, "", 100);//for best quality... your mileage may vary


ImageDestroy ($im);


?>





Better than using freetype, but with freetype2, the difference is marginal. To flip backround and foreground colors, alternate the order of ImageColorAllocate statements.


 


If you get outlines (the antialiasing produces these) reverse the $black and $white color identifiers in the ImagePsText function.





Happy PostScripting!





thx,


Neil

add a note

imagerectangle

imagepsslantfont

Last updated: Fri, 20 Jun 2008