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<!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>设定 alpha 混色标志以使用绑定的 libgd 分层效果</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.imagelayereffect" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagelayereffect</h1>
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<p class="verinfo">(PHP 4 >= 4.3.0, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagelayereffect</span> — <span class="dc-title">设定 alpha 混色标志以使用绑定的 libgd 分层效果
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</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.imagelayereffect-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>imagelayereffect</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
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, <span class="methodparam"><span class="type">int</span> <code class="parameter">$effect</code></span>
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) : <span class="type">bool</span></div>
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<p class="para rdfs-comment">
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设定 alpha 混色标志以使用绑定的 libgd 分层效果。
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</p>
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</div>
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<div class="refsect1 parameters" id="refsect1-function.imagelayereffect-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">effect</code></dt>
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<dd>
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<p class="para">
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One of the following constants:
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<dl>
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<dt>
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<strong><code>IMG_EFFECT_REPLACE</code></strong></dt>
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<dd>
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<span class="simpara">
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Use pixel replacement (equivalent of passing <strong><code>TRUE</code></strong> to
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<span class="function"><a href="imagealphablending.html" class="function">imagealphablending()</a></span>)
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</span>
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</dd>
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<dt>
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<strong><code>IMG_EFFECT_ALPHABLEND</code></strong></dt>
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<dd>
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<span class="simpara">
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Use normal pixel blending (equivalent of passing <strong><code>FALSE</code></strong> to
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<span class="function"><a href="imagealphablending.html" class="function">imagealphablending()</a></span>)
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</span>
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</dd>
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<dt>
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<strong><code>IMG_EFFECT_NORMAL</code></strong></dt>
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<dd>
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<span class="simpara">
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Same as <strong><code>IMG_EFFECT_ALPHABLEND</code></strong>.
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</span>
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</dd>
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<dt>
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<strong><code>IMG_EFFECT_OVERLAY</code></strong></dt>
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<dd>
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<span class="simpara">
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Overlay has the effect that black background pixels will remain
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black, white background pixels will remain white, but grey
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background pixels will take the colour of the foreground pixel.
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</span>
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</dd>
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</dl>
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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.imagelayereffect-returnvalues">
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<h3 class="title">返回值</h3>
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<p class="para">
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成功时返回 <strong><code>TRUE</code></strong>， 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 examples" id="refsect1-function.imagelayereffect-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-3720">
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<p><strong>Example #1 <span class="function"><strong>imagelayereffect()</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">// Setup an image<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Set a background<br /></span><span style="color: #0000BB">imagefilledrectangle</span><span style="color: #007700">(</span><span style="color: #0000BB">$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">100</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">220</span><span style="color: #007700">, </span><span style="color: #0000BB">220</span><span style="color: #007700">, </span><span style="color: #0000BB">220</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// Apply the overlay alpha blending flag<br /></span><span style="color: #0000BB">imagelayereffect</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">IMG_EFFECT_OVERLAY</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Draw two grey ellipses<br /></span><span style="color: #0000BB">imagefilledellipse</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">50</span><span style="color: #007700">, </span><span style="color: #0000BB">50</span><span style="color: #007700">, </span><span style="color: #0000BB">40</span><span style="color: #007700">, </span><span style="color: #0000BB">40</span><span style="color: #007700">, </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">));<br /></span><span style="color: #0000BB">imagefilledellipse</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">50</span><span style="color: #007700">, </span><span style="color: #0000BB">50</span><span style="color: #007700">, </span><span style="color: #0000BB">50</span><span style="color: #007700">, </span><span style="color: #0000BB">80</span><span style="color: #007700">, </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">100</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">));<br /></span><span style="color: #0000BB">imagefilledellipse</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">50</span><span style="color: #007700">, </span><span style="color: #0000BB">50</span><span style="color: #007700">, </span><span style="color: #0000BB">80</span><span style="color: #007700">, </span><span style="color: #0000BB">50</span><span style="color: #007700">, </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">255</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">));<br /><br /></span><span style="color: #FF8000">// Output<br /></span><span style="color: #0000BB">header</span><span style="color: #007700">(</span><span style="color: #DD0000">'Content-type: image/png'</span><span style="color: #007700">);<br /><br /></span><span style="color: #0000BB">imagepng</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">imagedestroy</span><span style="color: #007700">(</span><span style="color: #0000BB">$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 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-imagelayereffect.png" alt="Output of example : imagelayereffect()" width="100" height="100" />
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</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.imagelayereffect-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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<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></div></div></body></html> |