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306 lines
14 KiB
HTML
<!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>使用 FreeType 2 字体将文本写入图像</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.imagefttext" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagefttext</h1>
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<p class="verinfo">(PHP 4 >= 4.0.7, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagefttext</span> — <span class="dc-title">使用 FreeType 2 字体将文本写入图像</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.imagefttext-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>imagefttext</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
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, <span class="methodparam"><span class="type">float</span> <code class="parameter">$size</code></span>
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, <span class="methodparam"><span class="type">float</span> <code class="parameter">$angle</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$x</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$y</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$color</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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</div>
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<div class="refsect1 parameters" id="refsect1-function.imagefttext-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">image</code></dt>
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<dd>
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<p class="para">由图象创建函数(例如<span class="function"><a href="imagecreatetruecolor.html" class="function">imagecreatetruecolor()</a></span>)返回的图象资源。</p></dd>
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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">
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The font size to use in points.
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</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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The angle in degrees, with 0 degrees being left-to-right reading text.
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Higher values represent a counter-clockwise rotation. For example, a
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value of 90 would result in bottom-to-top reading text.
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</p>
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</dd>
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<dt>
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<code class="parameter">x</code></dt>
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<dd>
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<p class="para">
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The coordinates given by <code class="parameter">x</code> and
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<code class="parameter">y</code> will define the basepoint of the first
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character (roughly the lower-left corner of the character). This
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is different from the <span class="function"><a href="imagestring.html" class="function">imagestring()</a></span>, where
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<code class="parameter">x</code> and <code class="parameter">y</code> define the
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upper-left corner of the first character. For example, "top left"
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is 0, 0.
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</p>
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</dd>
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<dt>
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<code class="parameter">y</code></dt>
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<dd>
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<p class="para">
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The y-ordinate. This sets the position of the fonts baseline, not the
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very bottom of the character.
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</p>
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</dd>
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<dt>
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<code class="parameter">color</code></dt>
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<dd>
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<p class="para">
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The index of the desired color for the text, see
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<span class="function"><a href="imagecolorexact.html" class="function">imagecolorexact()</a></span>.
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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 path to the TrueType font you wish to use.
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</p>
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<p class="para">
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Depending on which version of the GD library PHP is using, <em class="emphasis">when
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<code class="parameter">fontfile</code> does not begin with a leading
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<em>/</em> then <em>.ttf</em> will be appended</em>
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to the filename and the library will attempt to search for that
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filename along a library-defined font path.
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</p>
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<p class="para">
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When using versions of the GD library lower than 2.0.18, a <em>space</em> character,
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rather than a semicolon, was used as the 'path separator' for different font files.
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Unintentional use of this feature will result in the warning message:
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<em>Warning: Could not find/open font</em>. For these affected versions, the
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only solution is moving the font to a path which does not contain spaces.
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</p>
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<p class="para">
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In many cases where a font resides in the same directory as the script using it
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the following trick will alleviate any include problems.
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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">// Set the enviroment variable for GD<br /></span><span style="color: #0000BB">putenv</span><span style="color: #007700">(</span><span style="color: #DD0000">'GDFONTPATH=' </span><span style="color: #007700">. </span><span style="color: #0000BB">realpath</span><span style="color: #007700">(</span><span style="color: #DD0000">'.'</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// Name the font to be used (note the lack of the .ttf extension)<br /></span><span style="color: #0000BB">$font </span><span style="color: #007700">= </span><span style="color: #DD0000">'SomeFont'</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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</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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Text to be inserted into image.
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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.imagefttext-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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This function returns an array defining the four points of the box, starting in the lower left and moving counter-clockwise:
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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 x-coordinate</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 y-coordinate</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 x-coordinate</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 y-coordinate</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 x-coordinate</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 y-coordinate</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 x-coordinate</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 y-coordinate</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 class="refsect1 examples" id="refsect1-function.imagefttext-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-3708">
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<p><strong>Example #1 <span class="function"><strong>imagefttext()</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 300x100 image<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">300</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$red </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">0xFF</span><span style="color: #007700">, </span><span style="color: #0000BB">0x00</span><span style="color: #007700">, </span><span style="color: #0000BB">0x00</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$black </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">0x00</span><span style="color: #007700">, </span><span style="color: #0000BB">0x00</span><span style="color: #007700">, </span><span style="color: #0000BB">0x00</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Make the background red<br /></span><span style="color: #0000BB">imagefilledrectangle</span><span style="color: #007700">(</span><span style="color: #0000BB">$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">99</span><span style="color: #007700">, </span><span style="color: #0000BB">$red</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Path to our ttf font file<br /></span><span style="color: #0000BB">$font_file </span><span style="color: #007700">= </span><span style="color: #DD0000">'./arial.ttf'</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// Draw the text 'PHP Manual' using font size 13<br /></span><span style="color: #0000BB">imagefttext</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">13</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">105</span><span style="color: #007700">, </span><span style="color: #0000BB">55</span><span style="color: #007700">, </span><span style="color: #0000BB">$black</span><span style="color: #007700">, </span><span style="color: #0000BB">$font_file</span><span style="color: #007700">, </span><span style="color: #DD0000">'PHP Manual'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Output image to the browser<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-Type: image/png'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">imagepng</span><span style="color: #007700">(</span><span style="color: #0000BB">$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.imagefttext-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.imagefttext-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> |