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140 lines
7.8 KiB
HTML
140 lines
7.8 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>取得指定的颜色加透明度的索引值</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.imagecolorexactalpha" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagecolorexactalpha</h1>
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<p class="verinfo">(PHP 4 >= 4.0.6, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagecolorexactalpha</span> — <span class="dc-title">取得指定的颜色加透明度的索引值</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.imagecolorexactalpha-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>imagecolorexactalpha</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="methodparam"><span class="type">int</span> <code class="parameter">$alpha</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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返回图像调色板中指定颜色加透明度的索引值。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.imagecolorexactalpha-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">red</code></dt>
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<dd>
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<p class="para">红色成分的值。</p>
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</dd>
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<dt>
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<code class="parameter">green</code></dt>
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<dd>
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<p class="para">绿色成分的值。</p>
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</dd>
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<dt>
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<code class="parameter">blue</code></dt>
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<dd>
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<p class="para">蓝色成分的值。</p>
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</dd>
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<dt>
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<code class="parameter">alpha</code></dt>
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<dd>
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<p class="para">
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A value between <em>0</em> and <em>127</em>.
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<em>0</em> indicates completely opaque while
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<em>127</em> indicates completely transparent.
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</p>
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</dd>
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</dl>
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The colors parameters are integers between 0 and 255 or hexadecimals
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between 0x00 and 0xFF.
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</p>
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</div>
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<div class="refsect1 returnvalues" id="refsect1-function.imagecolorexactalpha-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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返回图像调色板中指定颜色加透明度的索引值。
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如果颜色不在图像的调色板中，返回 -1。
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</p>
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</div>
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<div class="refsect1 examples" id="refsect1-function.imagecolorexactalpha-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-3667">
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<p><strong>Example #1 Get colors from the GD logo</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">// Setup an image<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">'./gdlogo.png'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">$colors </span><span style="color: #007700">= Array();<br /></span><span style="color: #0000BB">$colors</span><span style="color: #007700">[] = </span><span style="color: #0000BB">imagecolorexactalpha</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$colors</span><span style="color: #007700">[] = </span><span style="color: #0000BB">imagecolorexactalpha</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">0</span><span style="color: #007700">, </span><span style="color: #0000BB">127</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$colors</span><span style="color: #007700">[] = </span><span style="color: #0000BB">imagecolorexactalpha</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">55</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">$colors</span><span style="color: #007700">[] = </span><span style="color: #0000BB">imagecolorexactalpha</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">52</span><span style="color: #007700">, </span><span style="color: #0000BB">20</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">print_r</span><span style="color: #007700">(</span><span style="color: #0000BB">$colors</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Free from memory<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 class="example-contents"><p>以上例程的输出类似于：</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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[0] => 16711680
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[1] => 2130706432
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[2] => 939524095
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[3] => 342163252
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)
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</pre></div>
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</div>
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</div>
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</div>
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<div class="refsect1 notes" id="refsect1-function.imagecolorexactalpha-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>
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<div class="refsect1 seealso" id="refsect1-function.imagecolorexactalpha-seealso">
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<h3 class="title">参见</h3>
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<p class="para">
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<ul class="simplelist">
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<li class="member"><span class="function"><a href="imagecolorclosestalpha.html" class="function" rel="rdfs-seeAlso">imagecolorclosestalpha()</a> - 取得与指定的颜色加透明度最接近的颜色</span></li>
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</ul>
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</p>
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</div>
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</div></div></div></body></html> |