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238 lines
12 KiB
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta http-equiv="content-type" content="text/html; charset=UTF-8">
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<title>给出一个使用 FreeType 2 字体的文本框</title>
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</head>
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<body class="docs"><div id="layout">
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<div id="layout-content"><div id="function.imageftbbox" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imageftbbox</h1>
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<p class="verinfo">(PHP 4 >= 4.0.7, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imageftbbox</span> — <span class="dc-title">给出一个使用 FreeType 2 字体的文本框</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.imageftbbox-description">
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<h3 class="title">说明</h3>
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<div class="methodsynopsis dc-description">
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<span class="methodname"><strong>imageftbbox</strong></span>
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( <span class="methodparam"><span class="type">float</span> <code class="parameter">$size</code></span>
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, <span class="methodparam"><span class="type">float</span> <code class="parameter">$angle</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$fontfile</code></span>
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, <span class="methodparam"><span class="type">string</span> <code class="parameter">$text</code></span>
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[, <span class="methodparam"><span class="type">array</span> <code class="parameter">$extrainfo</code></span>
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] ) : <span class="type">array</span></div>
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<p class="para rdfs-comment">
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This function calculates and returns the bounding box in pixels
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for a FreeType text.
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.imageftbbox-parameters">
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<h3 class="title">参数</h3>
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<p class="para">
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<dl>
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<dt>
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<code class="parameter">size</code></dt>
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<dd>
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<p class="para">字体的尺寸。根据 GD 的版本，为像素尺寸（GD1）或点（磅）尺寸（GD2）。</p>
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</dd>
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<dt>
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<code class="parameter">angle</code></dt>
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<dd>
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<p class="para">
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Angle in degrees in which <code class="parameter">text</code> will be
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measured.
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</p>
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</dd>
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<dt>
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<code class="parameter">fontfile</code></dt>
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<dd>
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<p class="para">
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The name of the TrueType font file (can be a URL). Depending on
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which version of the GD library that PHP is using, it may attempt to
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search for files that do not begin with a leading '/' by appending
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'.ttf' to the filename and searching along a library-defined font path.
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</p>
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</dd>
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<dt>
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<code class="parameter">text</code></dt>
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<dd>
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<p class="para">
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The string to be measured.
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</p>
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</dd>
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<dt>
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<code class="parameter">extrainfo</code></dt>
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<dd>
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<p class="para">
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<table class="doctable table">
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<caption><strong>Possible array indexes for <code class="parameter">extrainfo</code></strong></caption>
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<thead>
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<tr>
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<th>Key</th>
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<th>Type</th>
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<th>Meaning</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td><em>linespacing</em></td>
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<td><span class="type"><a href="language.types.float.html" class="type float">float</a></span></td>
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<td>Defines drawing linespacing</td>
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</tr>
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</tbody>
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</table>
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</p>
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</dd>
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</dl>
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.imageftbbox-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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<span class="function"><strong>imageftbbox()</strong></span> returns an array with 8
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elements representing four points making the bounding box of the
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text:
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<table class="doctable informaltable">
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<tbody class="tbody">
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<tr>
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<td>0</td>
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<td>lower left corner, X position</td>
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</tr>
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<tr>
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<td>1</td>
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<td>lower left corner, Y position</td>
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</tr>
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<tr>
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<td>2</td>
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<td>lower right corner, X position</td>
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</tr>
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<tr>
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<td>3</td>
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<td>lower right corner, Y position</td>
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</tr>
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<tr>
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<td>4</td>
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<td>upper right corner, X position</td>
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</tr>
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<tr>
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<td>5</td>
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<td>upper right corner, Y position</td>
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</tr>
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<tr>
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<td>6</td>
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<td>upper left corner, X position</td>
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</tr>
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<tr>
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<td>7</td>
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<td>upper left corner, Y position</td>
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</tr>
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</tbody>
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</table>
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</p>
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<p class="para">
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The points are relative to the <em class="emphasis">text</em> regardless of the
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<code class="parameter">angle</code>, so "upper left" means in the top left-hand
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corner seeing the text horizontally.
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.imageftbbox-examples">
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<h3 class="title">范例</h3>
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<p class="para">
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<div class="example" id="example-3707">
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<p><strong>Example #1 <span class="function"><strong>imageftbbox()</strong></span> example</strong></p>
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<div class="example-contents">
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<div class="phpcode"><pre><span style="color: #000000">
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<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>
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</span>
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</pre></div>
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</div>
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</div>
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</p>
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</div>
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<div class="refsect1 notes" id="refsect1-function.imageftbbox-notes">
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<h3 class="title">注释</h3>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数需要 GD 2.0.1 或更高版本(推荐 2.0.28 及更高版本)。</span></p></blockquote>
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<blockquote class="note"><p><strong class="note">Note</strong>: <span class="simpara">此函数仅在
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PHP 编译时加入 freetype 支持时有效（<strong class="option configure">--with-freetype-dir=DIR</strong>
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）。</span></p></blockquote>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.imageftbbox-changelog">
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<h3 class="title">更新日志</h3>
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<p class="para">
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<table class="doctable informaltable">
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<thead>
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<tr>
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<th>版本</th>
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<th>说明</th>
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</tr>
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</thead>
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<tbody class="tbody">
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<tr>
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<td>4.3.5</td>
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<td>
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<code class="parameter">extrainfo</code> was made optional.
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</td>
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</tr>
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</tbody>
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</table>
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</p>
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</div>
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</div></div></div></body></html> |