function.imageftbbox.html
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head> <title>Give the bounding box of a text using fonts via freetype2</title> <meta http-equiv="content-type" content="text/html; charset=UTF-8"> </head> <body><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.imagefontwidth.html">imagefontwidth</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.imagefttext.html">imagefttext</a></div> <div class="up"><a href="ref.image.html">GD Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div><hr /><div id="function.imageftbbox" class="refentry"> <div class="refnamediv"> <h1 class="refname">imageftbbox</h1> <p class="verinfo">(PHP 4 >= 4.0.7, PHP 5)</p><p class="refpurpose"><span class="refname">imageftbbox</span> — <span class="dc-title">Give the bounding box of a text using fonts via freetype2</span></p> </div> <div class="refsect1 description"> <h3 class="title">Description</h3> <div class="methodsynopsis dc-description"> <span class="type">array</span> <span class="methodname"><b><b>imageftbbox</b></b></span> ( <span class="methodparam"><span class="type">float</span> <tt class="parameter">$size</tt></span> , <span class="methodparam"><span class="type">float</span> <tt class="parameter">$angle</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$fontfile</tt></span> , <span class="methodparam"><span class="type">string</span> <tt class="parameter">$text</tt></span> [, <span class="methodparam"><span class="type">array</span> <tt class="parameter">$extrainfo</tt></span> ] )</div> <p class="para rdfs-comment"> This function calculates and returns the bounding box in pixels for a FreeType text. </p> </div> <div class="refsect1 parameters"> <h3 class="title">Parameters</h3> <p class="para"> <dl> <dt> <span class="term"><i><tt class="parameter">size</tt></i></span> <dd> <p class="para"> The font size. Depending on your version of GD, this should be specified as the pixel size (GD1) or point size (GD2). </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">angle</tt></i></span> <dd> <p class="para"> Angle in degrees in which <i><tt class="parameter">text</tt></i> will be measured. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">fontfile</tt></i></span> <dd> <p class="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. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">text</tt></i></span> <dd> <p class="para"> The string to be measured. </p> </dd> </dt> <dt> <span class="term"><i><tt class="parameter">extrainfo</tt></i></span> <dd> <p class="para"> <table border="5"> <caption><b>Possible array indexes for <i><tt class="parameter">extrainfo</tt></i></b></caption> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Key</th> <th colspan="1">Type</th> <th colspan="1">Meaning</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left"><i>linespacing</i></td> <td colspan="1" rowspan="1" align="left"><a href="language.types.float.html" class="type float">float</a></td> <td colspan="1" rowspan="1" align="left">Defines drawing linespacing</td> </tr> </tbody> </colgroup> </table> </p> </dd> </dt> </dl> </p> </div> <div class="refsect1 returnvalues"> <h3 class="title">Return Values</h3> <p class="para"> <b>imageftbbox()</b> returns an array with 8 elements representing four points making the bounding box of the text: <table class="informaltable"> <colgroup> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">0</td> <td colspan="1" rowspan="1" align="left">lower left corner, X position</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">1</td> <td colspan="1" rowspan="1" align="left">lower left corner, Y position</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">2</td> <td colspan="1" rowspan="1" align="left">lower right corner, X position</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">3</td> <td colspan="1" rowspan="1" align="left">lower right corner, Y position</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4</td> <td colspan="1" rowspan="1" align="left">upper right corner, X position</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">5</td> <td colspan="1" rowspan="1" align="left">upper right corner, Y position</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">6</td> <td colspan="1" rowspan="1" align="left">upper left corner, X position</td> </tr> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">7</td> <td colspan="1" rowspan="1" align="left">upper left corner, Y position</td> </tr> </tbody> </colgroup> </table> </p> <p class="para"> The points are relative to the <em class="emphasis">text</em> regardless of the <i><tt class="parameter">angle</tt></i>, so "upper left" means in the top left-hand corner seeing the text horizontally. </p> </div> <div class="refsect1 examples"> <h3 class="title">Examples</h3> <p class="para"> <div class="example"> <p><b>Example #1 <b>imageftbbox()</b> example</b></p> <div class="example-contents"><div class="phpcode"><code><span style="color: #000000"><span style="color: #0000BB"><?php<br /></span><span style="color: #FF8000">// Create a 300x150 image<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">300</span><span style="color: #007700">, </span><span style="color: #0000BB">150</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$black </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$white </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Set the background to be white<br /></span><span style="color: #0000BB">imagefilledrectangle</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">299</span><span style="color: #007700">, </span><span style="color: #0000BB">299</span><span style="color: #007700">, </span><span style="color: #0000BB">$white</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Path to our font file<br /></span><span style="color: #0000BB">$font </span><span style="color: #007700">= </span><span style="color: #DD0000">'./arial.ttf'</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// First we create our bounding box<br /></span><span style="color: #0000BB">$bbox </span><span style="color: #007700">= </span><span style="color: #0000BB">imageftbbox</span><span style="color: #007700">(</span><span style="color: #0000BB">10</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">$font</span><span style="color: #007700">, </span><span style="color: #DD0000">'The PHP Documentation Group'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// This is our cordinates for X and Y<br /></span><span style="color: #0000BB">$x </span><span style="color: #007700">= </span><span style="color: #0000BB">$bbox</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">] + (</span><span style="color: #0000BB">imagesx</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">) / </span><span style="color: #0000BB">2</span><span style="color: #007700">) - (</span><span style="color: #0000BB">$bbox</span><span style="color: #007700">[</span><span style="color: #0000BB">4</span><span style="color: #007700">] / </span><span style="color: #0000BB">2</span><span style="color: #007700">) - </span><span style="color: #0000BB">5</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$y </span><span style="color: #007700">= </span><span style="color: #0000BB">$bbox</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">] + (</span><span style="color: #0000BB">imagesy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">) / </span><span style="color: #0000BB">2</span><span style="color: #007700">) - (</span><span style="color: #0000BB">$bbox</span><span style="color: #007700">[</span><span style="color: #0000BB">5</span><span style="color: #007700">] / </span><span style="color: #0000BB">2</span><span style="color: #007700">) - </span><span style="color: #0000BB">5</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">imagefttext</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">10</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">$x</span><span style="color: #007700">, </span><span style="color: #0000BB">$y</span><span style="color: #007700">, </span><span style="color: #0000BB">$black</span><span style="color: #007700">, </span><span style="color: #0000BB">$font</span><span style="color: #007700">, </span><span style="color: #DD0000">'The PHP Documentation Group'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Output to browser<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-type: image/png'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">imagepng</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?></span></span></code></div> </div> </div> </p> </div> <div class="refsect1 notes"> <h3 class="title">Notes</h3> <blockquote><p><b class="note">Note</b>: <span class="simpara">This function requires GD 2.0.1 or later (2.0.28 or later is recommended).</span></p></blockquote> <blockquote><p><b class="note">Note</b>: <span class="simpara">This function is only available ifPHP is compiled with freetype support (<span class="option">--with-freetype-dir=DIR</span>)</span></p></blockquote> </div> <div class="refsect1 changelog"> <h3 class="title">ChangeLog</h3> <p class="para"> <table class="informaltable"> <colgroup> <thead valign="middle"> <tr valign="middle"> <th colspan="1">Version</th> <th colspan="1">Description</th> </tr> </thead> <tbody valign="middle" class="tbody"> <tr valign="middle"> <td colspan="1" rowspan="1" align="left">4.3.5</td> <td colspan="1" rowspan="1" align="left"> <i><tt class="parameter">extrainfo</tt></i> was made optional. </td> </tr> </tbody> </colgroup> </table> </p> </div></div><hr /><div style="text-align: center;"> <div class="prev" style="text-align: left; float: left;"><a href="function.imagefontwidth.html">imagefontwidth</a></div> <div class="next" style="text-align: right; float: right;"><a href="function.imagefttext.html">imagefttext</a></div> <div class="up"><a href="ref.image.html">GD Functions</a></div> <div class="home"><a href="index.html">PHP Manual</a></div></div></body></html>⌨️ 快捷键说明
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