imagepstext

(PHP 4, PHP 5)

imagepstext — Draws a text over an image using PostScript Type1 fonts

설명

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 ]]]] )

Draws a text on an image using PostScript Type1 fonts.

Refer to PostScript documentation about fonts and their measuring system if you have trouble understanding how this works.

Warning

This function was REMOVED in PHP 7.0.0.

인수

image: imagecreatetruecolor() 등의 이미지 생성 함수에서 반환한 이미지 자원.
text: The text to be written.
font_index: A font resource, returned by imagepsloadfont().
size: size is expressed in pixels.
foreground: The color in which the text will be painted.
background: The color to which the text will try to fade in with antialiasing. No pixels with the color background are actually painted, so the background image does not need to be of solid color.
x: x-coordinate for the lower-left corner of the first character.
y: y-coordinate for the lower-left corner of the first character.
space: Allows you to change the default value of a space in a font. This amount is added to the normal value and can also be negative. Expressed in character space units, where 1 unit is 1/1000th of an em-square.
tightness: tightness allows you to control the amount of white space between characters. This amount is added to the normal character width and can also be negative. Expressed in character space units, where 1 unit is 1/1000th of an em-square.
angle: angle is in degrees.
antialias_steps: Allows you to control the number of colours used for antialiasing text. Allowed values are 4 and 16. The higher value is recommended for text sizes lower than 20, where the effect in text quality is quite visible. With bigger sizes, use 4. It's less computationally intensive.

반환값

This function returns an array containing the following elements:

0	lower left x-coordinate
1	lower left y-coordinate
2	upper right x-coordinate
3	upper right y-coordinate

예제

Example #1 imagepstext() usage


<?php
// Create image handle
$im = imagecreatetruecolor(200, 200);

// Allocate colors
$black = imagecolorallocate($im, 0, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);

// Load the PostScript Font
$font = imagepsloadfont('font.pfm');

// Write the font to the image
imagepstext($im, 'Sample text is simple', $font, 12, $black, $white, 50, 50);

// Output and free memory
header('Content-type: image/png');

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

변경점

버전	설명
7.0.0	T1Lib support was removed from PHP, thrus removing this function.

주의

Note: 이 함수는 --enable-t1lib 를 사용하여 PHP를 컴파일 했을 경우에만 사용할 수 있습니다.

참고

imagepsbbox() - Give the bounding box of a text rectangle using PostScript Type1 fonts

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User Contributed Notes 12 notes

down

chrislewis60 at hotmail dot com ¶

17 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.

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soletan at toxa dot de ¶

14 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.

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whitemarker dot blogspot dot com ¶

17 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()."

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honza dot bartos at gmail dot com ¶

18 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.

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johan (at) 1way2print.net ¶

22 years ago


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

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a at url dot de ¶

22 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).

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npdavis at hotmail dot com ¶

23 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

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-1

heckp at uni-trier.de ¶

21 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);

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-1

npdavis at hotmail dot com ¶

23 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

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-2

m.confalonieri(at)mclink.it ¶

21 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;

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-2

npdavis at hotmail dot com ¶

23 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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-1

Jeroen dot Straahof at newego dot nl ¶

21 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;
}

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