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156 lines
6.5 KiB
HTML
156 lines
6.5 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>用给定角度旋转图像</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.imagerotate" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagerotate</h1>
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<p class="verinfo">(PHP 4 >= 4.3.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagerotate</span> — <span class="dc-title">用给定角度旋转图像</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.imagerotate-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>imagerotate</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
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, <span class="methodparam"><span class="type">float</span> <code class="parameter">$angle</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$bgd_color</code></span>
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[, <span class="methodparam"><span class="type">int</span> <code class="parameter">$ignore_transparent</code><span class="initializer"> = 0</span></span>
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] ) : <span class="type">resource</span></div>
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<p class="para rdfs-comment">
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将 <code class="parameter">src_im</code> 图像用给定的
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<code class="parameter">angle</code> 角度旋转。<code class="parameter">bgd_color</code>
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指定了旋转后没有覆盖到的部分的颜色。
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</p>
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<p class="para">
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旋转的中心是图像的中心，旋转后的图像会按比例缩小以适合目标图像的大小——边缘不会被剪去。
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</p>
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<p class="para">
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.imagerotate-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">angle</code></dt>
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<dd>
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<p class="para">
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Rotation angle, in degrees. The rotation angle is interpreted as the
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number of degrees to rotate the image anticlockwise.
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</p>
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</dd>
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<dt>
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<code class="parameter">bgd_color</code></dt>
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<dd>
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<p class="para">
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Specifies the color of the uncovered zone after the rotation
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</p>
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</dd>
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<dt>
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<code class="parameter">ignore_transparent</code></dt>
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<dd>
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<p class="para">
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如果被设为非零值，则透明色会被忽略（否则会被保留）。
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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.imagerotate-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回旋转后的图像资源，
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或者在失败时返回 <strong><code>FALSE</code></strong>。
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</p>
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</div>
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<div class="refsect1 changelog" id="refsect1-function.imagerotate-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>5.1.0</td>
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<td>
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新增： <code class="parameter">ignore_transparent</code> 。
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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 class="refsect1 examples" id="refsect1-function.imagerotate-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-3734">
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<p><strong>Example #1 将图像旋转 180 度</strong></p>
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<div class="example-contents"><p>
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本例将把一幅图像旋转 180 度——上下颠倒。
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</p></div>
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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">// File and rotation<br /></span><span style="color: #0000BB">$filename </span><span style="color: #007700">= </span><span style="color: #DD0000">'test.jpg'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$degrees </span><span style="color: #007700">= </span><span style="color: #0000BB">180</span><span style="color: #007700">;<br /><br /></span><span style="color: #FF8000">// Content type<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-type: image/jpeg'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Load<br /></span><span style="color: #0000BB">$source </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatefromjpeg</span><span style="color: #007700">(</span><span style="color: #0000BB">$filename</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Rotate<br /></span><span style="color: #0000BB">$rotate </span><span style="color: #007700">= </span><span style="color: #0000BB">imagerotate</span><span style="color: #007700">(</span><span style="color: #0000BB">$source</span><span style="color: #007700">, </span><span style="color: #0000BB">$degrees</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Output<br /></span><span style="color: #0000BB">imagejpeg</span><span style="color: #007700">(</span><span style="color: #0000BB">$rotate</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 class="example-contents"><p>以上例程的输出类似于：</p></div>
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<div class="mediaobject">
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<div class="imageobject">
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<img src="images/21009b70229598c6a80eef8b45bf282b-imagerotate.jpg" alt="例子的输出：将图像旋转 180 度" width="95" height="51" />
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</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.imagerotate-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">此函数仅在与 GD 库捆绑编译的 PHP 版本中可用。</span></p></blockquote>
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</div>
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</div></div></div></body></html> |