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58 lines
4.4 KiB
HTML
58 lines
4.4 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>取得某索引的颜色</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.imagecolorsforindex" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagecolorsforindex</h1>
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<p class="verinfo">(PHP 4, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagecolorsforindex</span> — <span class="dc-title">取得某索引的颜色</span></p>
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</div>
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<div class="refsect1 unknown-unknown-seealsq" id="refsect1-function.imagecolorsforindex-unknown-unknown-seealsq">
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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>imagecolorsforindex</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$index</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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本函数返回一个具有 red，green，blue 和 alpha
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的键名的关联数组，包含了指定颜色索引的相应的值。
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</p>
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<p class="para">
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<div class="example" id="example-3670">
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<p><strong>Example #1 <span class="function"><strong>imagecolorsforindex()</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 /><br /></span><span style="color: #FF8000">// 打开一幅图像<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatefrompng</span><span style="color: #007700">(</span><span style="color: #DD0000">'nexen.png'</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 取得一点的颜色<br /></span><span style="color: #0000BB">$start_x </span><span style="color: #007700">= </span><span style="color: #0000BB">40</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$start_y </span><span style="color: #007700">= </span><span style="color: #0000BB">50</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$color_index </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorat</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">$start_x</span><span style="color: #007700">, </span><span style="color: #0000BB">$start_y</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 使其可读<br /></span><span style="color: #0000BB">$color_tran </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecolorsforindex</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">$color_index</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// 显示该颜色的值<br /></span><span style="color: #007700">echo </span><span style="color: #DD0000">'<pre>'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$color_tran</span><span style="color: #007700">);<br />echo </span><span style="color: #DD0000">'</pre>'</span><span style="color: #007700">;<br /><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>
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本例将输出：
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</p></div>
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<div class="example-contents screen">
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<div class="cdata"><pre>
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Array
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(
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[red] => 226
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[green] => 222
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[blue] => 252
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[alpha] => 0
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)
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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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参见 <span class="function"><a href="imagecolorat.html" class="function">imagecolorat()</a></span> 和
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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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</div>
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</div></div></div></body></html> |