PHP 5.4.33 Released

imagepstext

(PHP 4, PHP 5)

imagepstextDessine un texte sur une image avec une police PostScript Type1

Description

array imagepstext ( resource $image , string $text , resource $font_index , int $size , int $foreground , int $background , int $x , int $y [, int $space = 0 [, int $tightness = 0 [, float $angle = 0.0 [, int $antialias_steps = 4 ]]]] )

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, retournée par une des fonctions de création d'images, comme imagecreatetruecolor().

text

Le texte à écrire.

font_index

Une ressource de police, retournée par la fonction imagepsloadfont().

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

Exemples

Exemple #1 Exemple avec imagepstext()

<?php
// Création d'une nouvelle image
$im imagecreatetruecolor(200200);

// Alloue les couleurs
$black imagecolorallocate($im000);
$white imagecolorallocate($im255255255);

// Charge la police PostScript
$font imagepsloadfont('font.pfm');

// Dessine un texte dans l'image
imagepstext($im'Un texte simple'$font12$black$white5050);

// Affichage et libération de la mémoire
header('Content-type: image/png');

imagepng($im);
imagedestroy($im);
?>

Notes

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

Voir aussi

  • imagepsbbox() - Retourne le rectangle entourant un texte et dessiné avec une police PostScript Type1

add a note add a note

User Contributed Notes 12 notes

up
1
johan (at) 1way2print.net
11 years ago
If you use fonts with special chars, remeber to read in the encoded file *.enc with imagepsencodefont ... etc. for Danish, Swedish, German.....
up
0
whitemarker dot blogspot dot com
6 years ago
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()."
up
0
chrislewis60 at hotmail dot com
7 years ago
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.
up
0
honza dot bartos at gmail dot com
7 years ago
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.
up
0
heckp at uni-trier.de
11 years ago
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);
up
0
npdavis at hotmail dot com
13 years ago
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
up
-1
soletan at toxa dot de
4 years ago
As of PHP 5.2.13 with bundled GD (2.0.34) antialiasing_steps mustn't be "4 to 16", but "4 or 16". Values from 5 to 15 result in a warning.
up
-1
m.confalonieri(at)mclink.it
11 years ago
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;
up
-1
Jeroen dot Straahof at newego dot nl
11 years ago
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;
}
up
-1
a at url dot de
12 years ago
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).
up
-1
npdavis at hotmail dot com
13 years ago
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
up
-1
npdavis at hotmail dot com
13 years ago
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
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