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127 lines
7.2 KiB
HTML
127 lines
7.2 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>从给定的 GD2 文件或 URL 中的部分新建一图像</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.imagecreatefromgd2part" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagecreatefromgd2part</h1>
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<p class="verinfo">(PHP 4 >= 4.0.7, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagecreatefromgd2part</span> — <span class="dc-title">从给定的 GD2 文件或 URL 中的部分新建一图像</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.imagecreatefromgd2part-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>imagecreatefromgd2part</strong></span>
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( <span class="methodparam"><span class="type">string</span> <code class="parameter">$filename</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$srcX</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$srcY</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$width</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$height</code></span>
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) : <span class="type">resource</span></div>
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<p class="para rdfs-comment">
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Create a new image from a given part of GD2 file or URL.
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</p>
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<div class="tip"><strong class="tip">Tip</strong><p class="simpara">如已启用<a href="filesystem.configuration.html#ini.allow_url_fopen" class="link">fopen 包装器</a>，在此函数中， URL 可作为文件名。关于如何指定文件名详见 <span class="function"><a href="fopen.html" class="function">fopen()</a></span>。各种
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wapper 的不同功能请参见 <a href="wrappers.html" class="xref">支持的协议和封装协议</a>，注意其用法及其可提供的预定义变量。</p></div>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.imagecreatefromgd2part-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">filename</code></dt>
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<dd>
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<p class="para">
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Path to the GD2 image.
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</p>
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</dd>
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<dt>
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<code class="parameter">srcX</code></dt>
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<dd>
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<p class="para">
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x-coordinate of source point.
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</p>
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</dd>
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<dt>
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<code class="parameter">srcY</code></dt>
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<dd>
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<p class="para">
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y-coordinate of source point.
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</p>
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</dd>
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<dt>
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<code class="parameter">width</code></dt>
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<dd>
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<p class="para">源图象的宽度。</p>
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</dd>
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<dt>
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<code class="parameter">height</code></dt>
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<dd>
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<p class="para">源图象的高度。</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.imagecreatefromgd2part-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">成功后返回图象资源,失败后返回 <strong><code>FALSE</code></strong> 。</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.imagecreatefromgd2part-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-3679">
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<p><strong>Example #1 <span class="function"><strong>imagecreatefromgd2part()</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">// For this example we need the image size before<br /></span><span style="color: #0000BB">$image </span><span style="color: #007700">= </span><span style="color: #0000BB">getimagesize</span><span style="color: #007700">(</span><span style="color: #DD0000">'./test.gd2'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Create the image instance now we got the image <br />// sizes<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatefromgd2part</span><span style="color: #007700">(</span><span style="color: #DD0000">'./test.gd2'</span><span style="color: #007700">, </span><span style="color: #0000BB">4</span><span style="color: #007700">, </span><span style="color: #0000BB">4</span><span style="color: #007700">, (</span><span style="color: #0000BB">$image</span><span style="color: #007700">[</span><span style="color: #0000BB">0</span><span style="color: #007700">] / </span><span style="color: #0000BB">2</span><span style="color: #007700">) - </span><span style="color: #0000BB">6</span><span style="color: #007700">, (</span><span style="color: #0000BB">$image</span><span style="color: #007700">[</span><span style="color: #0000BB">1</span><span style="color: #007700">] / </span><span style="color: #0000BB">2</span><span style="color: #007700">) - </span><span style="color: #0000BB">6</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Do an image operation, in this case we emboss the <br />// image if PHP 5+<br /></span><span style="color: #007700">if(</span><span style="color: #0000BB">function_exists</span><span style="color: #007700">(</span><span style="color: #DD0000">'imagefilter'</span><span style="color: #007700">))<br />{<br /> </span><span style="color: #0000BB">imagefilter</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">IMG_FILTER_EMBOSS</span><span style="color: #007700">);<br />}<br /><br /></span><span style="color: #FF8000">// Save optimized image<br /></span><span style="color: #0000BB">imagegd2</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #DD0000">'./test_emboss.gd2'</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$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.imagecreatefromgd2part-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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<div class="warning"><strong class="warning">Warning</strong><p class="para">Windows 版本的 PHP 在 4.3.0
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版之前不支持通过此函数访问远程文件，即使已经启用 <a href="filesystem.configuration.html#ini.allow-url-fopen" class="link">allow_url_fopen</a>.
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</p></div>
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</div>
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</div></div></div></body></html> |