Give the bounding box of a text using fonts via freetype2

Descrizione

array imageftbbox ( float $size , float $angle , string $fontfile , string $text [, array $extrainfo ] )

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

Elenco dei parametri

size

La dimensione del carattere. A seconda della versione di GD, deve essere specificata in pixel (GD1) o in punti (GD2).

angle

Angle in degrees in which text will be measured.

fontfile

The name of the TrueType font file (can be a URL). Depending on which version of the GD library that PHP is using, it may attempt to search for files that do not begin with a leading '/' by appending '.ttf' to the filename and searching along a library-defined font path.

text

The string to be measured.

extrainfo

**Possible array indexes for `extrainfo`**
Key	Type	Meaning
linespacing	float	Defines drawing linespacing

Valori restituiti

imageftbbox() returns an array with 8 elements representing four points making the bounding box of the text:

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.

Esempi

Example #1 imageftbbox() example


<?php
// Create a 300x150 image
$im = imagecreatetruecolor(300, 150);
$black = imagecolorallocate($im, 0, 0, 0);
$white = imagecolorallocate($im, 255, 255, 255);

// Set the background to be white
imagefilledrectangle($im, 0, 0, 299, 299, $white);

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

// First we create our bounding box
$bbox = imageftbbox(10, 0, $font, 'The PHP Documentation Group');

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

imagefttext($im, 10, 0, $x, $y, $black, $font, 'The PHP Documentation Group');

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

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

Note

Nota: Questa funzione necessita di GD 2.0.1 o successivi (raccomandato 2.0.28 o successivi).

Nota: Questa funzione è disponibile solo se PHP è compilato con il supporto a freetype (--with-freetype-dir=DIR )