imagettfbbox

(PHP 4, PHP 5, PHP 7)

imagettfbboxGive the bounding box of a text using TrueType fonts

Descrierea

imagettfbbox ( float $size , float $angle , string $fontfile , string $text ) : array

This function calculates and returns the bounding box in pixels for a TrueType text.

Notă:

imageftbbox() is an extended variant of imagettfbbox() which additionally supports the extrainfo.

Parametri

size

Dimensiunea font-ului. În dependență de versiunea GD, aceasta trebuie specificată în unități de pixeli (GD1) sau în unități de puncte (GD2).

angle

Angle in degrees in which text will be measured.

fontfile

The path to the TrueType font you wish to use.

Depending on which version of the GD library PHP is using, when fontfile does not begin with a leading / then .ttf will be appended to the filename and the library will attempt to search for that filename along a library-defined font path.

When using versions of the GD library lower than 2.0.18, a space character, rather than a semicolon, was used as the 'path separator' for different font files. Unintentional use of this feature will result in the warning message: Warning: Could not find/open font. For these affected versions, the only solution is moving the font to a path which does not contain spaces.

In many cases where a font resides in the same directory as the script using it the following trick will alleviate any include problems.

<?php
// Set the enviroment variable for GD
putenv('GDFONTPATH=' realpath('.'));

// Name the font to be used (note the lack of the .ttf extension)
$font 'SomeFont';
?>

Notă:

Note that open_basedir does not apply to fontfile.

text

The string to be measured.

Valorile întoarse

imagettfbbox() returns an array with 8 elements representing four points making the bounding box of the text on success and FALSE on error.

key contents
0 lower left corner, X position
1 lower left corner, Y position
2 lower right corner, X position
3 lower right corner, Y position
4 upper right corner, X position
5 upper right corner, Y position
6 upper left corner, X position
7 upper left corner, Y position

The points are relative to the text regardless of the angle, so "upper left" means in the top left-hand corner seeing the text horizontally.

Exemple

Example #1 imagettfbbox() example

<?php
// Create a 300x150 image
$im imagecreatetruecolor(300150);
$black imagecolorallocate($im000);
$white imagecolorallocate($im255255255);

// Set the background to be white
imagefilledrectangle($im00299299$white);

// Path to our font file
$font './arial.ttf';

// First we create our bounding box for the first text
$bbox imagettfbbox(1045$font'Powered by PHP ' phpversion());

// This is our cordinates for X and Y
$x $bbox[0] + (imagesx($im) / 2) - ($bbox[4] / 2) - 25;
$y $bbox[1] + (imagesy($im) / 2) - ($bbox[5] / 2) - 5;

// Write it
imagettftext($im1045$x$y$black$font'Powered by PHP ' phpversion());

// Create the next bounding box for the second text
$bbox imagettfbbox(1045$font'and Zend Engine ' zend_version());

// Set the cordinates so its next to the first text
$x $bbox[0] + (imagesx($im) / 2) - ($bbox[4] / 2) + 10;
$y $bbox[1] + (imagesy($im) / 2) - ($bbox[5] / 2) - 5;

// Write it
imagettftext($im1045$x$y$black$font'and Zend Engine ' zend_version());

// Output to browser
header('Content-Type: image/png');

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

Note

Notă: Această funcție este disponibilă numai dacă PHP este compilat cu susținerea freetype (--with-freetype-dir=DIR )

A se vedea și

  • imagettftext() - Write text to the image using TrueType fonts
  • imageftbbox() - Give the bounding box of a text using fonts via freetype2