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89 lines
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HTML
89 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>设定图像的混色模式</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.imagealphablending" class="refentry">
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<div class="refnamediv">
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<h1 class="refname">imagealphablending</h1>
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<p class="verinfo">(PHP 4 >= 4.0.6, PHP 5, PHP 7)</p><p class="refpurpose"><span class="refname">imagealphablending</span> — <span class="dc-title">设定图像的混色模式</span></p>
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</div>
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<div class="refsect1 description" id="refsect1-function.imagealphablending-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>imagealphablending</strong></span>
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( <span class="methodparam"><span class="type">resource</span> <code class="parameter">$image</code></span>
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, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$blendmode</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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<span class="function"><strong>imagealphablending()</strong></span>
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允许在真彩色图像上使用两种不同的绘画模式。在混色（blending）模式下，alpha
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通道色彩成分提供给所有的绘画函数，例如 <span class="function"><a href="imagesetpixel.html" class="function">imagesetpixel()</a></span>
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决定底层的颜色应在何种程度上被允许照射透过。作为结果，GD
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自动将该点现有的颜色和画笔颜色混合，并将结果储存在图像中。结果的像素是不透明的。在非混色模式下，画笔颜色连同其
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alpha 通道信息一起被拷贝，替换掉目标像素。混色模式在画调色板图像时不可用。如果
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<code class="parameter">blendmode</code> 为 <strong><code>TRUE</code></strong>，则启用混色模式，否则关闭。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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<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 parameters" id="refsect1-function.imagealphablending-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">blendmode</code></dt>
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<dd>
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<p class="para">
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Whether to enable the blending mode or not. On true color images
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the default value is <strong><code>TRUE</code></strong> otherwise the default value is <strong><code>FALSE</code></strong>
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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.imagealphablending-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.imagealphablending-examples">
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<h3 class="title">范例</h3>
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<div class="example" id="example-3655">
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<p><strong>Example #1 <span class="function"><strong>imagealphablending()</strong></span> usage 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">// Create image<br /></span><span style="color: #0000BB">$im </span><span style="color: #007700">= </span><span style="color: #0000BB">imagecreatetruecolor</span><span style="color: #007700">(</span><span style="color: #0000BB">100</span><span style="color: #007700">, </span><span style="color: #0000BB">100</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Set alphablending to on<br /></span><span style="color: #0000BB">imagealphablending</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">true</span><span style="color: #007700">);<br /><br /></span><span style="color: #FF8000">// Draw a square<br /></span><span style="color: #0000BB">imagefilledrectangle</span><span style="color: #007700">(</span><span style="color: #0000BB">$im</span><span style="color: #007700">, </span><span style="color: #0000BB">30</span><span style="color: #007700">, </span><span style="color: #0000BB">30</span><span style="color: #007700">, </span><span style="color: #0000BB">70</span><span style="color: #007700">, </span><span style="color: #0000BB">70</span><span style="color: #007700">, </span><span style="color: #0000BB">imagecolorallocate</span><span style="color: #007700">(</span><span style="color: #0000BB">$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 /><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>
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</div>
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<div class="refsect1 notes" id="refsect1-function.imagealphablending-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></div></div></body></html> |