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<?xml version="1.0" encoding="iso-8859-1"?>
<!-- $Revision: 1.13 $ -->
<refentry xml:id="function.imagettfbbox" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
<refnamediv>
<refname>imagettfbbox</refname>
<refpurpose>Give the bounding box of a text using TrueType fonts</refpurpose>
</refnamediv>
<refsect1 role="description">
&reftitle.description;
<methodsynopsis>
<type>array</type><methodname>imagettfbbox</methodname>
<methodparam><type>float</type><parameter>size</parameter></methodparam>
<methodparam><type>float</type><parameter>angle</parameter></methodparam>
<methodparam><type>string</type><parameter>fontfile</parameter></methodparam>
<methodparam><type>string</type><parameter>text</parameter></methodparam>
</methodsynopsis>
<para>
This function calculates and returns the bounding box in pixels
for a TrueType text.
</para>
</refsect1>
<refsect1 role="parameters">
&reftitle.parameters;
<para>
<variablelist>
<varlistentry>
<term><parameter>size</parameter></term>
<listitem>
<para>
The font size. Depending on your version of GD, this should be
specified as the pixel size (GD1) or point size (GD2).
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>angle</parameter></term>
<listitem>
<para>
Angle in degrees in which <parameter>text</parameter> will be measured.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>fontfile</parameter></term>
<listitem>
<para>
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.
</para>
</listitem>
</varlistentry>
<varlistentry>
<term><parameter>text</parameter></term>
<listitem>
<para>
The string to be measured.
</para>
</listitem>
</varlistentry>
</variablelist>
</para>
</refsect1>
<refsect1 role="returnvalues">
&reftitle.returnvalues;
<para>
<function>imagettfbbox</function> returns an array with 8
elements representing four points making the bounding box of the
text:
<informaltable>
<tgroup cols="2">
<tbody>
<row>
<entry>0</entry>
<entry>lower left corner, X position</entry>
</row>
<row>
<entry>1</entry>
<entry>lower left corner, Y position</entry>
</row>
<row>
<entry>2</entry>
<entry>lower right corner, X position</entry>
</row>
<row>
<entry>3</entry>
<entry>lower right corner, Y position</entry>
</row>
<row>
<entry>4</entry>
<entry>upper right corner, X position</entry>
</row>
<row>
<entry>5</entry>
<entry>upper right corner, Y position</entry>
</row>
<row>
<entry>6</entry>
<entry>upper left corner, X position</entry>
</row>
<row>
<entry>7</entry>
<entry>upper left corner, Y position</entry>
</row>
</tbody>
</tgroup>
</informaltable>
</para>
<para>
The points are relative to the <emphasis>text</emphasis> regardless of the
<parameter>angle</parameter>, so "upper left" means in the top left-hand
corner seeing the text horizontally.
</para>
</refsect1>
<refsect1 role="examples">
&reftitle.examples;
<para>
<example>
<title><function>imagettfbbox</function> example</title>
<programlisting role="php">
<![CDATA[
<?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 for the first text
$bbox = imagettfbbox(10, 45, $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) - ($bbox[5] / 2) - 5;
// Write it
imagettftext($im, 10, 45, $x, $y, $black, $font, 'Powered by PHP ' . phpversion());
// Create the next bounding box for the second text
$bbox = imagettfbbox(10, 45, $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) - ($bbox[5] / 2) - 5;
// Write it
imagettftext($im, 10, 45, $x, $y, $black, $font, 'and Zend Engine ' . zend_version());
// Output to browser
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>
]]>
</programlisting>
</example>
</para>
</refsect1>
<refsect1 role="notes">
&reftitle.seealso;
<note>
<para>
This function requires both the GD library and the <link
xlink:href="&url.freetype;">FreeType</link> library.
</para>
</note>
</refsect1>
<refsect1 role="seealso">
&reftitle.seealso;
<para>
<simplelist>
<member><function>imagettftext</function></member>
</simplelist>
</para>
</refsect1>
</refentry>
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