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58 lines
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58 lines
6.3 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>为一幅图像分配颜色</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.imagecolorallocate" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagecolorallocate</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagecolorallocate</span> — <span class="dc-title">为一幅图像分配颜色</span></p>
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</div>
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<div class="refsect1 unknown-unknown-unknown-examplev" id="refsect1-function.imagecolorallocate-unknown-unknown-unknown-examplev">
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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>imagecolorallocate</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$red</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$green</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$blue</code></span>
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) : <span class="type">int</span></div>
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<p class="para rdfs-comment">
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<span class="function"><strong>imagecolorallocate()</strong></span> 返回一个标识符，代表了由给定的
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<acronym title="Red-Green-Blue">RGB</acronym> 成分组成的颜色。<code class="parameter">red</code>，<code class="parameter">green</code> 和
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<code class="parameter">blue</code> 分别是所需要的颜色的红，绿，蓝成分。这些参数是
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0 到 255 的整数或者十六进制的 0x00 到 0xFF。<span class="function"><strong>imagecolorallocate()</strong></span>
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必须被调用以创建每一种用在 <code class="parameter">image</code> 所代表的图像中的颜色。
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</p>
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<blockquote class="note"><p><strong class="note">Note</strong>:
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<p class="para">
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第一次对 <span class="function"><strong>imagecolorallocate()</strong></span>
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的调用会给基于调色板的图像填充背景色，即用 <span class="function"><a href="imagecreate.html" class="function">imagecreate()</a></span> 建立的图像。
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</p>
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</p></blockquote>
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<p class="para">
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<div class="example" id="example-3661">
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<p><strong>Example #1 <span class="function"><strong>imagecolorallocate()</strong></span> 例子</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 />$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreate</span><span style="color: #007700">(</span><span style="color: #DD0000">'example.jpg'</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// 背景设为红色<br /></span><span style="color: #0000BB">$background </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// 设定一些颜色<br /></span><span style="color: #0000BB">$white </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$black </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #FF8000">// 十六进制方式<br /></span><span style="color: #0000BB">$white </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">0xFF</span><span style="color: #007700">, </span><span style="color: #0000BB">0xFF</span><span style="color: #007700">, </span><span style="color: #0000BB">0xFF</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$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 /></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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<p class="para">
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如果分配失败则返回 -1。
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</p>
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<p class="para">
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参见 <span class="function"><a href="imagecolorallocatealpha.html" class="function">imagecolorallocatealpha()</a></span> 和
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<span class="function"><a href="imagecolordeallocate.html" class="function">imagecolordeallocate()</a></span>。
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</p>
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</div>
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</div></div></div></body></html> |